/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=WIDESTAMONGSMALL --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/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 23:39:23,594 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 23:39:23,596 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 23:39:23,625 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 23:39:23,625 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 23:39:23,626 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 23:39:23,628 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 23:39:23,629 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 23:39:23,631 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 23:39:23,632 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 23:39:23,633 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 23:39:23,634 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 23:39:23,634 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 23:39:23,635 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 23:39:23,636 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 23:39:23,637 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 23:39:23,638 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 23:39:23,639 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 23:39:23,640 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 23:39:23,642 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 23:39:23,643 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 23:39:23,644 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 23:39:23,645 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 23:39:23,646 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 23:39:23,648 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 23:39:23,655 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 23:39:23,656 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 23:39:23,657 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 23:39:23,658 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 [2020-08-18 23:39:23,690 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 23:39:23,690 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 23:39:23,693 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 23:39:23,693 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 23:39:23,693 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 23:39:23,694 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 23:39:23,694 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 23:39:23,694 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 23:39:23,694 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 23:39:23,694 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 23:39:23,694 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 23:39:23,694 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 23:39:23,697 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 23:39:23,697 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 23:39:23,698 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 23:39:23,698 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 23:39:23,698 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 23:39:23,698 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 23:39:23,699 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 23:39:23,699 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 23:39:23,699 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 23:39:23,699 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 23:39:23,699 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 23:39:23,700 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 23:39:23,700 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 23:39:23,700 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 23:39:23,700 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 23:39:23,700 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 23:39:23,700 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 23:39:23,701 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=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; [2020-08-18 23:39:23,995 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 23:39:24,008 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 23:39:24,014 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 23:39:24,016 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 23:39:24,016 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 23:39:24,017 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 23:39:24,079 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f6df7d05f/8cab52424dfa4267924df5ea0d00ef6b/FLAG684b2a432 [2020-08-18 23:39:24,521 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 23:39:24,522 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 23:39:24,528 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f6df7d05f/8cab52424dfa4267924df5ea0d00ef6b/FLAG684b2a432 [2020-08-18 23:39:24,971 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f6df7d05f/8cab52424dfa4267924df5ea0d00ef6b [2020-08-18 23:39:24,981 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 23:39:24,983 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 23:39:24,986 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 23:39:24,986 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 23:39:24,990 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 23:39:24,991 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:39:24" (1/1) ... [2020-08-18 23:39:24,994 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a7e2148 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:24, skipping insertion in model container [2020-08-18 23:39:24,994 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:39:24" (1/1) ... [2020-08-18 23:39:25,002 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 23:39:25,021 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 23:39:25,209 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:39:25,213 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 23:39:25,224 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:39:25,235 INFO L208 MainTranslator]: Completed translation [2020-08-18 23:39:25,235 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25 WrapperNode [2020-08-18 23:39:25,235 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 23:39:25,236 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 23:39:25,236 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 23:39:25,237 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 23:39:25,246 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25" (1/1) ... [2020-08-18 23:39:25,246 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25" (1/1) ... [2020-08-18 23:39:25,329 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25" (1/1) ... [2020-08-18 23:39:25,329 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25" (1/1) ... [2020-08-18 23:39:25,333 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25" (1/1) ... [2020-08-18 23:39:25,338 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25" (1/1) ... [2020-08-18 23:39:25,339 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25" (1/1) ... [2020-08-18 23:39:25,340 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 23:39:25,340 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 23:39:25,341 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 23:39:25,341 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 23:39:25,341 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25" (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 [2020-08-18 23:39:25,393 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 23:39:25,393 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 23:39:25,393 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 23:39:25,394 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 23:39:25,394 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 23:39:25,394 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 23:39:25,394 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 23:39:25,394 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 23:39:25,395 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 23:39:25,548 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 23:39:25,548 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 23:39:25,551 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:39:25 BoogieIcfgContainer [2020-08-18 23:39:25,551 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 23:39:25,552 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 23:39:25,552 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 23:39:25,556 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 23:39:25,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 11:39:24" (1/3) ... [2020-08-18 23:39:25,557 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42cdaaea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:39:25, skipping insertion in model container [2020-08-18 23:39:25,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:25" (2/3) ... [2020-08-18 23:39:25,557 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42cdaaea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:39:25, skipping insertion in model container [2020-08-18 23:39:25,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:39:25" (3/3) ... [2020-08-18 23:39:25,559 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-18 23:39:25,569 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 23:39:25,577 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 23:39:25,591 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 23:39:25,613 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 23:39:25,613 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 23:39:25,613 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 23:39:25,613 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 23:39:25,613 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 23:39:25,614 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 23:39:25,614 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 23:39:25,614 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 23:39:25,628 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 23:39:25,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 23:39:25,633 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:25,634 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:25,634 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:25,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:25,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 23:39:25,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:25,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [58220143] [2020-08-18 23:39:25,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:25,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:25,956 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 8 [2020-08-18 23:39:25,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:25,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:25,963 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:25,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [58220143] [2020-08-18 23:39:25,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:25,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 23:39:25,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442296361] [2020-08-18 23:39:25,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 23:39:25,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:25,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 23:39:25,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 23:39:25,983 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 23:39:26,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:26,009 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 23:39:26,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 23:39:26,011 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 23:39:26,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:26,021 INFO L225 Difference]: With dead ends: 29 [2020-08-18 23:39:26,021 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 23:39:26,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 23:39:26,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 23:39:26,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 23:39:26,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 23:39:26,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 23:39:26,055 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 23:39:26,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:26,055 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 23:39:26,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 23:39:26,056 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 23:39:26,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 23:39:26,056 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:26,056 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:26,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 23:39:26,057 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:26,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:26,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 23:39:26,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:26,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [624133069] [2020-08-18 23:39:26,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:26,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:26,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:26,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [624133069] [2020-08-18 23:39:26,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:26,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 23:39:26,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322796822] [2020-08-18 23:39:26,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 23:39:26,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:26,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 23:39:26,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:39:26,156 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 23:39:26,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:26,175 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 23:39:26,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 23:39:26,175 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 23:39:26,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:26,176 INFO L225 Difference]: With dead ends: 18 [2020-08-18 23:39:26,176 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 23:39:26,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:39:26,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 23:39:26,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 23:39:26,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 23:39:26,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 23:39:26,182 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 23:39:26,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:26,183 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 23:39:26,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 23:39:26,183 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 23:39:26,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 23:39:26,184 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:26,184 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:26,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 23:39:26,185 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:26,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:26,185 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 23:39:26,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:26,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273622566] [2020-08-18 23:39:26,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:26,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:26,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,274 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:26,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273622566] [2020-08-18 23:39:26,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:26,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 23:39:26,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251962706] [2020-08-18 23:39:26,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 23:39:26,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:26,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 23:39:26,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 23:39:26,277 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 23:39:26,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:26,297 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 23:39:26,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 23:39:26,298 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 23:39:26,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:26,299 INFO L225 Difference]: With dead ends: 19 [2020-08-18 23:39:26,299 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 23:39:26,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 23:39:26,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 23:39:26,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 23:39:26,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 23:39:26,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 23:39:26,305 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 23:39:26,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:26,306 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 23:39:26,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 23:39:26,306 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 23:39:26,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 23:39:26,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:26,307 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:26,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 23:39:26,307 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:26,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:26,308 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 23:39:26,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:26,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [661732765] [2020-08-18 23:39:26,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:26,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:26,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,432 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:26,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [661732765] [2020-08-18 23:39:26,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:26,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 23:39:26,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383267783] [2020-08-18 23:39:26,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 23:39:26,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:26,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 23:39:26,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 23:39:26,435 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 23:39:26,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:26,460 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 23:39:26,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 23:39:26,461 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 23:39:26,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:26,461 INFO L225 Difference]: With dead ends: 20 [2020-08-18 23:39:26,462 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 23:39:26,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 23:39:26,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 23:39:26,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 23:39:26,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 23:39:26,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 23:39:26,467 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 23:39:26,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:26,468 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 23:39:26,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 23:39:26,468 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 23:39:26,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 23:39:26,469 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:26,469 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:26,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 23:39:26,469 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:26,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:26,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 23:39:26,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:26,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347363481] [2020-08-18 23:39:26,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:26,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:26,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,593 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:26,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347363481] [2020-08-18 23:39:26,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:26,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 23:39:26,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041078318] [2020-08-18 23:39:26,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 23:39:26,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:26,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 23:39:26,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 23:39:26,596 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 23:39:26,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:26,630 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 23:39:26,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 23:39:26,631 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 23:39:26,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:26,632 INFO L225 Difference]: With dead ends: 21 [2020-08-18 23:39:26,632 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 23:39:26,633 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 23:39:26,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 23:39:26,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 23:39:26,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 23:39:26,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 23:39:26,639 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 23:39:26,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:26,639 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 23:39:26,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 23:39:26,640 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 23:39:26,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 23:39:26,640 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:26,640 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:26,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 23:39:26,641 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:26,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:26,642 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 23:39:26,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:26,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611612938] [2020-08-18 23:39:26,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:26,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:26,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,819 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:26,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611612938] [2020-08-18 23:39:26,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:26,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 23:39:26,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076000692] [2020-08-18 23:39:26,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 23:39:26,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:26,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 23:39:26,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 23:39:26,822 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 23:39:26,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:26,865 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 23:39:26,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 23:39:26,865 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 23:39:26,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:26,866 INFO L225 Difference]: With dead ends: 22 [2020-08-18 23:39:26,866 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 23:39:26,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 23:39:26,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 23:39:26,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 23:39:26,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 23:39:26,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 23:39:26,872 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 23:39:26,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:26,873 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 23:39:26,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 23:39:26,873 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 23:39:26,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 23:39:26,874 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:26,874 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:26,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 23:39:26,874 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:26,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:26,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 23:39:26,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:26,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818668477] [2020-08-18 23:39:26,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:26,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:26,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,997 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:26,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818668477] [2020-08-18 23:39:26,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:26,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 23:39:26,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824210414] [2020-08-18 23:39:26,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 23:39:26,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:26,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 23:39:26,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 23:39:26,999 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 23:39:27,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:27,045 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 23:39:27,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 23:39:27,046 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 23:39:27,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:27,047 INFO L225 Difference]: With dead ends: 23 [2020-08-18 23:39:27,047 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 23:39:27,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 23:39:27,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 23:39:27,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 23:39:27,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 23:39:27,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 23:39:27,053 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 23:39:27,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:27,053 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 23:39:27,053 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 23:39:27,053 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 23:39:27,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 23:39:27,054 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:27,054 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:27,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 23:39:27,055 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:27,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:27,055 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 23:39:27,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:27,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378795286] [2020-08-18 23:39:27,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:27,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:27,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,185 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:27,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378795286] [2020-08-18 23:39:27,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:27,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 23:39:27,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286394180] [2020-08-18 23:39:27,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 23:39:27,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:27,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 23:39:27,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 23:39:27,188 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 23:39:27,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:27,237 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 23:39:27,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 23:39:27,237 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 23:39:27,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:27,238 INFO L225 Difference]: With dead ends: 24 [2020-08-18 23:39:27,238 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 23:39:27,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 23:39:27,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 23:39:27,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 23:39:27,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 23:39:27,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 23:39:27,244 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 23:39:27,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:27,244 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 23:39:27,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 23:39:27,244 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 23:39:27,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 23:39:27,245 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:27,245 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:27,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 23:39:27,246 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:27,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:27,246 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 23:39:27,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:27,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642036119] [2020-08-18 23:39:27,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:27,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:27,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,397 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:27,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642036119] [2020-08-18 23:39:27,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:27,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 23:39:27,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823295934] [2020-08-18 23:39:27,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 23:39:27,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:27,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 23:39:27,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 23:39:27,400 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 23:39:27,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:27,464 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 23:39:27,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 23:39:27,465 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 23:39:27,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:27,465 INFO L225 Difference]: With dead ends: 25 [2020-08-18 23:39:27,466 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 23:39:27,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 23:39:27,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 23:39:27,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 23:39:27,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 23:39:27,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 23:39:27,471 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 23:39:27,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:27,472 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 23:39:27,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 23:39:27,472 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 23:39:27,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 23:39:27,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:27,473 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:27,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 23:39:27,474 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:27,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:27,474 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 23:39:27,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:27,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1387098564] [2020-08-18 23:39:27,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:27,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:27,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,639 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:27,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1387098564] [2020-08-18 23:39:27,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:27,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 23:39:27,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256726016] [2020-08-18 23:39:27,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 23:39:27,641 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:27,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 23:39:27,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 23:39:27,641 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 23:39:27,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:27,735 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 23:39:27,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 23:39:27,736 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 23:39:27,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:27,737 INFO L225 Difference]: With dead ends: 26 [2020-08-18 23:39:27,737 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 23:39:27,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 23:39:27,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 23:39:27,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 23:39:27,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 23:39:27,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 23:39:27,742 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 23:39:27,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:27,742 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 23:39:27,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 23:39:27,742 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 23:39:27,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 23:39:27,743 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:27,743 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:27,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 23:39:27,744 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:27,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:27,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 23:39:27,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:27,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736152543] [2020-08-18 23:39:27,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:27,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:27,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,921 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:27,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736152543] [2020-08-18 23:39:27,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:27,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 23:39:27,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295733782] [2020-08-18 23:39:27,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 23:39:27,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:27,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 23:39:27,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 23:39:27,924 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 23:39:28,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:28,027 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 23:39:28,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 23:39:28,028 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 23:39:28,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:28,029 INFO L225 Difference]: With dead ends: 27 [2020-08-18 23:39:28,029 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 23:39:28,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 23:39:28,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 23:39:28,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 23:39:28,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 23:39:28,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 23:39:28,035 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 23:39:28,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:28,035 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 23:39:28,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 23:39:28,036 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 23:39:28,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 23:39:28,037 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:28,037 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:28,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 23:39:28,037 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:28,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:28,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 23:39:28,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:28,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895781016] [2020-08-18 23:39:28,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:28,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:28,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,226 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:28,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895781016] [2020-08-18 23:39:28,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:28,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 23:39:28,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021081892] [2020-08-18 23:39:28,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 23:39:28,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:28,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 23:39:28,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 23:39:28,229 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 23:39:28,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:28,329 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 23:39:28,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 23:39:28,330 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 23:39:28,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:28,330 INFO L225 Difference]: With dead ends: 28 [2020-08-18 23:39:28,330 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 23:39:28,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 23:39:28,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 23:39:28,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 23:39:28,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 23:39:28,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 23:39:28,336 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 23:39:28,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:28,336 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 23:39:28,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 23:39:28,336 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 23:39:28,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 23:39:28,337 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:28,337 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:28,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 23:39:28,338 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:28,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:28,338 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 23:39:28,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:28,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377024465] [2020-08-18 23:39:28,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:28,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:28,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,559 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:28,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377024465] [2020-08-18 23:39:28,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:28,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 23:39:28,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036370868] [2020-08-18 23:39:28,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 23:39:28,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:28,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 23:39:28,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 23:39:28,563 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 23:39:28,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:28,698 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 23:39:28,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 23:39:28,701 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 23:39:28,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:28,701 INFO L225 Difference]: With dead ends: 29 [2020-08-18 23:39:28,701 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 23:39:28,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 23:39:28,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 23:39:28,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 23:39:28,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 23:39:28,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 23:39:28,707 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 23:39:28,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:28,708 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 23:39:28,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 23:39:28,708 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 23:39:28,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 23:39:28,709 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:28,709 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:28,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 23:39:28,710 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:28,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:28,710 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 23:39:28,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:28,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1727823547] [2020-08-18 23:39:28,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:28,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:28,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,954 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:28,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1727823547] [2020-08-18 23:39:28,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:28,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 23:39:28,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935459410] [2020-08-18 23:39:28,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 23:39:28,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:28,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 23:39:28,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 23:39:28,956 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 23:39:29,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:29,100 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 23:39:29,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 23:39:29,102 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 23:39:29,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:29,103 INFO L225 Difference]: With dead ends: 30 [2020-08-18 23:39:29,103 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 23:39:29,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 23:39:29,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 23:39:29,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 23:39:29,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 23:39:29,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 23:39:29,112 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 23:39:29,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:29,113 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 23:39:29,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 23:39:29,113 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 23:39:29,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 23:39:29,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:29,114 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:29,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 23:39:29,114 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:29,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:29,115 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 23:39:29,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:29,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718056924] [2020-08-18 23:39:29,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:29,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:29,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:29,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:29,365 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:29,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718056924] [2020-08-18 23:39:29,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:29,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 23:39:29,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624741002] [2020-08-18 23:39:29,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 23:39:29,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:29,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 23:39:29,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 23:39:29,367 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 23:39:29,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:29,527 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 23:39:29,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 23:39:29,528 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 23:39:29,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:29,528 INFO L225 Difference]: With dead ends: 31 [2020-08-18 23:39:29,528 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 23:39:29,529 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 23:39:29,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 23:39:29,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 23:39:29,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 23:39:29,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 23:39:29,533 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 23:39:29,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:29,534 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 23:39:29,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 23:39:29,534 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 23:39:29,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 23:39:29,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:29,535 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:29,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 23:39:29,535 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:29,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:29,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 23:39:29,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:29,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646840218] [2020-08-18 23:39:29,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:29,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:29,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:29,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:29,792 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:29,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646840218] [2020-08-18 23:39:29,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:29,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 23:39:29,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718752779] [2020-08-18 23:39:29,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 23:39:29,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:29,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 23:39:29,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 23:39:29,794 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 23:39:29,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:29,971 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 23:39:29,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 23:39:29,972 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 23:39:29,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:29,973 INFO L225 Difference]: With dead ends: 32 [2020-08-18 23:39:29,973 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 23:39:29,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 23:39:29,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 23:39:29,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 23:39:29,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 23:39:29,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 23:39:29,979 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 23:39:29,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:29,979 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 23:39:29,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 23:39:29,979 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 23:39:29,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 23:39:29,980 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:29,980 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:29,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 23:39:29,981 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:29,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:29,981 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 23:39:29,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:29,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348414878] [2020-08-18 23:39:29,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:29,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:30,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:30,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:30,274 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:30,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348414878] [2020-08-18 23:39:30,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:30,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 23:39:30,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323022187] [2020-08-18 23:39:30,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 23:39:30,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:30,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 23:39:30,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 23:39:30,276 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 23:39:30,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:30,505 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 23:39:30,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 23:39:30,506 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 23:39:30,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:30,507 INFO L225 Difference]: With dead ends: 33 [2020-08-18 23:39:30,507 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 23:39:30,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 23:39:30,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 23:39:30,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 23:39:30,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 23:39:30,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 23:39:30,513 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 23:39:30,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:30,513 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 23:39:30,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 23:39:30,513 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 23:39:30,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 23:39:30,514 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:30,514 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:30,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 23:39:30,515 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:30,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:30,515 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 23:39:30,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:30,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500205808] [2020-08-18 23:39:30,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:30,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:30,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:30,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:30,808 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:30,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500205808] [2020-08-18 23:39:30,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:30,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 23:39:30,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097911520] [2020-08-18 23:39:30,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 23:39:30,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:30,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 23:39:30,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 23:39:30,810 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 23:39:31,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:31,019 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 23:39:31,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 23:39:31,019 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 23:39:31,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:31,020 INFO L225 Difference]: With dead ends: 34 [2020-08-18 23:39:31,020 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 23:39:31,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 23:39:31,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 23:39:31,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 23:39:31,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 23:39:31,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 23:39:31,026 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 23:39:31,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:31,026 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 23:39:31,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 23:39:31,026 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 23:39:31,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 23:39:31,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:31,027 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:31,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 23:39:31,027 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:31,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:31,028 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 23:39:31,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:31,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118493095] [2020-08-18 23:39:31,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:31,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:31,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:31,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:31,365 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:31,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118493095] [2020-08-18 23:39:31,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:31,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 23:39:31,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604180926] [2020-08-18 23:39:31,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 23:39:31,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:31,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 23:39:31,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 23:39:31,367 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 23:39:31,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:31,616 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 23:39:31,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 23:39:31,619 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 23:39:31,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:31,619 INFO L225 Difference]: With dead ends: 35 [2020-08-18 23:39:31,619 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 23:39:31,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 23:39:31,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 23:39:31,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 23:39:31,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 23:39:31,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 23:39:31,630 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 23:39:31,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:31,630 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 23:39:31,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 23:39:31,630 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 23:39:31,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 23:39:31,633 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:31,633 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:31,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 23:39:31,634 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:31,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:31,634 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 23:39:31,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:31,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325742735] [2020-08-18 23:39:31,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:31,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:32,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:32,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:32,004 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:32,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325742735] [2020-08-18 23:39:32,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:32,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 23:39:32,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658076578] [2020-08-18 23:39:32,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 23:39:32,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:32,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 23:39:32,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 23:39:32,006 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 23:39:32,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:32,270 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 23:39:32,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 23:39:32,271 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 23:39:32,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:32,272 INFO L225 Difference]: With dead ends: 36 [2020-08-18 23:39:32,272 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 23:39:32,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 23:39:32,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 23:39:32,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 23:39:32,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 23:39:32,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 23:39:32,277 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 23:39:32,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:32,277 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 23:39:32,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 23:39:32,277 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 23:39:32,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 23:39:32,278 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:32,278 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:32,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 23:39:32,278 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:32,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:32,279 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 23:39:32,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:32,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153849228] [2020-08-18 23:39:32,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:32,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:32,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:32,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:32,677 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:32,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153849228] [2020-08-18 23:39:32,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:32,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 23:39:32,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938636352] [2020-08-18 23:39:32,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 23:39:32,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:32,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 23:39:32,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 23:39:32,679 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 23:39:32,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:32,930 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 23:39:32,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 23:39:32,931 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 23:39:32,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:32,932 INFO L225 Difference]: With dead ends: 37 [2020-08-18 23:39:32,932 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 23:39:32,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 23:39:32,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 23:39:32,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 23:39:32,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 23:39:32,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 23:39:32,936 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 23:39:32,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:32,937 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 23:39:32,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 23:39:32,937 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 23:39:32,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 23:39:32,937 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:32,938 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:32,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 23:39:32,938 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:32,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:32,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 23:39:32,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:32,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988404440] [2020-08-18 23:39:32,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:32,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:33,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:33,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:33,370 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:33,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988404440] [2020-08-18 23:39:33,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:33,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 23:39:33,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016511555] [2020-08-18 23:39:33,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 23:39:33,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:33,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 23:39:33,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 23:39:33,372 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 23:39:33,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:33,676 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 23:39:33,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 23:39:33,679 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 23:39:33,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:33,679 INFO L225 Difference]: With dead ends: 38 [2020-08-18 23:39:33,680 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 23:39:33,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 23:39:33,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 23:39:33,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 23:39:33,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 23:39:33,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 23:39:33,685 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 23:39:33,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:33,685 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 23:39:33,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 23:39:33,685 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 23:39:33,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 23:39:33,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:33,686 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:33,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 23:39:33,686 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:33,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:33,687 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 23:39:33,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:33,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1309630088] [2020-08-18 23:39:33,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:33,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:34,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:34,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:34,149 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:34,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1309630088] [2020-08-18 23:39:34,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:34,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 23:39:34,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414540299] [2020-08-18 23:39:34,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 23:39:34,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:34,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 23:39:34,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 23:39:34,151 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 23:39:34,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:34,446 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 23:39:34,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 23:39:34,446 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 23:39:34,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:34,447 INFO L225 Difference]: With dead ends: 39 [2020-08-18 23:39:34,447 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 23:39:34,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 23:39:34,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 23:39:34,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 23:39:34,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 23:39:34,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 23:39:34,459 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 23:39:34,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:34,460 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 23:39:34,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 23:39:34,460 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 23:39:34,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 23:39:34,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:34,461 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:34,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 23:39:34,463 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:34,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:34,463 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 23:39:34,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:34,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2099339094] [2020-08-18 23:39:34,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:34,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:34,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:34,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:34,972 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:34,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2099339094] [2020-08-18 23:39:34,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:34,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 23:39:34,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050147758] [2020-08-18 23:39:34,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 23:39:34,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:34,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 23:39:34,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 23:39:34,974 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 23:39:35,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:35,337 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 23:39:35,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 23:39:35,338 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 23:39:35,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:35,339 INFO L225 Difference]: With dead ends: 40 [2020-08-18 23:39:35,339 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 23:39:35,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 23:39:35,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 23:39:35,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 23:39:35,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 23:39:35,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 23:39:35,343 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 23:39:35,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:35,343 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 23:39:35,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 23:39:35,344 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 23:39:35,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 23:39:35,344 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:35,344 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:35,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 23:39:35,345 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:35,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:35,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 23:39:35,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:35,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443185712] [2020-08-18 23:39:35,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:35,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:35,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:35,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:35,842 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:35,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443185712] [2020-08-18 23:39:35,843 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:35,843 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 23:39:35,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527461694] [2020-08-18 23:39:35,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 23:39:35,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:35,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 23:39:35,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 23:39:35,844 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 23:39:36,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:36,230 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 23:39:36,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 23:39:36,231 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 23:39:36,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:36,232 INFO L225 Difference]: With dead ends: 41 [2020-08-18 23:39:36,232 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 23:39:36,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 23:39:36,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 23:39:36,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 23:39:36,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 23:39:36,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 23:39:36,237 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 23:39:36,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:36,237 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 23:39:36,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 23:39:36,237 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 23:39:36,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 23:39:36,238 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:36,238 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:36,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 23:39:36,238 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:36,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:36,238 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 23:39:36,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:36,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769378995] [2020-08-18 23:39:36,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:36,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:36,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:36,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:36,769 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:36,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769378995] [2020-08-18 23:39:36,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:36,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 23:39:36,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085901241] [2020-08-18 23:39:36,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 23:39:36,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:36,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 23:39:36,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 23:39:36,771 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 23:39:37,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:37,205 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 23:39:37,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 23:39:37,206 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 23:39:37,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:37,206 INFO L225 Difference]: With dead ends: 42 [2020-08-18 23:39:37,207 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 23:39:37,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 23:39:37,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 23:39:37,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 23:39:37,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 23:39:37,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 23:39:37,211 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 23:39:37,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:37,211 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 23:39:37,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 23:39:37,211 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 23:39:37,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 23:39:37,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:37,212 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:37,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 23:39:37,212 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:37,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:37,213 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 23:39:37,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:37,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [210517005] [2020-08-18 23:39:37,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:37,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:37,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:37,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:37,783 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:37,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [210517005] [2020-08-18 23:39:37,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:37,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 23:39:37,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522640428] [2020-08-18 23:39:37,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 23:39:37,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:37,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 23:39:37,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 23:39:37,785 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 23:39:38,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:38,233 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 23:39:38,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 23:39:38,234 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 23:39:38,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:38,235 INFO L225 Difference]: With dead ends: 43 [2020-08-18 23:39:38,235 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 23:39:38,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 23:39:38,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 23:39:38,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 23:39:38,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 23:39:38,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 23:39:38,241 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 23:39:38,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:38,247 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 23:39:38,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 23:39:38,247 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 23:39:38,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 23:39:38,247 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:38,248 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:38,248 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 23:39:38,248 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:38,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:38,248 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 23:39:38,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:38,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805027806] [2020-08-18 23:39:38,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:38,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:39,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:39,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:39,111 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:39,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805027806] [2020-08-18 23:39:39,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:39,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 23:39:39,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357419503] [2020-08-18 23:39:39,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 23:39:39,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:39,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 23:39:39,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 23:39:39,115 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 23:39:39,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:39,632 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 23:39:39,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 23:39:39,633 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 23:39:39,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:39,633 INFO L225 Difference]: With dead ends: 44 [2020-08-18 23:39:39,633 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 23:39:39,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 23:39:39,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 23:39:39,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 23:39:39,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 23:39:39,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 23:39:39,641 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 23:39:39,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:39,642 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 23:39:39,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 23:39:39,642 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 23:39:39,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 23:39:39,643 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:39,643 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:39,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 23:39:39,643 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:39,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:39,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 23:39:39,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:39,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080159292] [2020-08-18 23:39:39,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:39,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:40,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:40,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:40,450 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:40,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080159292] [2020-08-18 23:39:40,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:40,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 23:39:40,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087623029] [2020-08-18 23:39:40,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 23:39:40,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:40,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 23:39:40,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 23:39:40,453 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 23:39:41,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:41,141 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 23:39:41,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 23:39:41,142 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 23:39:41,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:41,143 INFO L225 Difference]: With dead ends: 45 [2020-08-18 23:39:41,143 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 23:39:41,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 23:39:41,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 23:39:41,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 23:39:41,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 23:39:41,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 23:39:41,153 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 23:39:41,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:41,154 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 23:39:41,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 23:39:41,154 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 23:39:41,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 23:39:41,155 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:41,155 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:41,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 23:39:41,156 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:41,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:41,156 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 23:39:41,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:41,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827949772] [2020-08-18 23:39:41,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:41,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:41,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:41,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:41,956 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:41,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827949772] [2020-08-18 23:39:41,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:41,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 23:39:41,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290423558] [2020-08-18 23:39:41,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 23:39:41,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:41,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 23:39:41,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 23:39:41,958 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 23:39:42,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:42,534 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 23:39:42,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 23:39:42,534 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 23:39:42,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:42,535 INFO L225 Difference]: With dead ends: 46 [2020-08-18 23:39:42,535 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 23:39:42,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 23:39:42,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 23:39:42,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 23:39:42,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 23:39:42,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 23:39:42,539 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 23:39:42,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:42,540 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 23:39:42,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 23:39:42,540 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 23:39:42,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 23:39:42,540 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:42,540 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:42,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 23:39:42,541 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:42,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:42,541 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 23:39:42,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:42,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160400563] [2020-08-18 23:39:42,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:42,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:43,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:43,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:43,269 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:43,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160400563] [2020-08-18 23:39:43,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:43,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 23:39:43,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889123479] [2020-08-18 23:39:43,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 23:39:43,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:43,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 23:39:43,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 23:39:43,271 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 23:39:43,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:43,854 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 23:39:43,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 23:39:43,855 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 23:39:43,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:43,856 INFO L225 Difference]: With dead ends: 47 [2020-08-18 23:39:43,856 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 23:39:43,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 23:39:43,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 23:39:43,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 23:39:43,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 23:39:43,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 23:39:43,860 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 23:39:43,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:43,860 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 23:39:43,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 23:39:43,860 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 23:39:43,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 23:39:43,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:43,861 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:43,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 23:39:43,861 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:43,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:43,862 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 23:39:43,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:43,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341318990] [2020-08-18 23:39:43,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:43,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:44,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:44,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:44,633 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:44,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341318990] [2020-08-18 23:39:44,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:44,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 23:39:44,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804863810] [2020-08-18 23:39:44,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 23:39:44,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:44,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 23:39:44,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 23:39:44,635 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 23:39:45,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:45,261 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 23:39:45,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 23:39:45,261 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 23:39:45,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:45,262 INFO L225 Difference]: With dead ends: 48 [2020-08-18 23:39:45,262 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 23:39:45,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 23:39:45,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 23:39:45,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 23:39:45,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 23:39:45,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 23:39:45,266 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 23:39:45,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:45,267 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 23:39:45,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 23:39:45,267 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 23:39:45,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 23:39:45,267 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:45,267 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:45,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 23:39:45,268 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:45,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:45,268 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 23:39:45,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:45,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737771516] [2020-08-18 23:39:45,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:45,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:46,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:46,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:46,115 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:46,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737771516] [2020-08-18 23:39:46,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:46,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 23:39:46,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447446506] [2020-08-18 23:39:46,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 23:39:46,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:46,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 23:39:46,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 23:39:46,117 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 23:39:46,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:46,806 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 23:39:46,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 23:39:46,806 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 23:39:46,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:46,807 INFO L225 Difference]: With dead ends: 49 [2020-08-18 23:39:46,807 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 23:39:46,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 23:39:46,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 23:39:46,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 23:39:46,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 23:39:46,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 23:39:46,813 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 23:39:46,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:46,813 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 23:39:46,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 23:39:46,813 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 23:39:46,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 23:39:46,814 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:46,814 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:46,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 23:39:46,814 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:46,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:46,815 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 23:39:46,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:46,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603686542] [2020-08-18 23:39:46,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:46,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:47,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:47,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:47,751 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:47,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603686542] [2020-08-18 23:39:47,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:47,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 23:39:47,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633754357] [2020-08-18 23:39:47,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 23:39:47,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:47,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 23:39:47,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 23:39:47,753 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 23:39:48,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:48,464 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 23:39:48,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 23:39:48,464 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 23:39:48,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:48,465 INFO L225 Difference]: With dead ends: 50 [2020-08-18 23:39:48,465 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 23:39:48,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 23:39:48,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 23:39:48,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 23:39:48,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 23:39:48,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 23:39:48,470 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 23:39:48,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:48,470 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 23:39:48,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 23:39:48,471 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 23:39:48,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 23:39:48,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:48,471 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:48,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 23:39:48,472 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:48,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:48,472 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 23:39:48,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:48,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357461843] [2020-08-18 23:39:48,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:48,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:49,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:49,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:49,404 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:49,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357461843] [2020-08-18 23:39:49,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:49,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 23:39:49,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934467958] [2020-08-18 23:39:49,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 23:39:49,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:49,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 23:39:49,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 23:39:49,406 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 23:39:50,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:50,157 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 23:39:50,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 23:39:50,158 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 23:39:50,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:50,159 INFO L225 Difference]: With dead ends: 51 [2020-08-18 23:39:50,159 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 23:39:50,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 23:39:50,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 23:39:50,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 23:39:50,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 23:39:50,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 23:39:50,163 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 23:39:50,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:50,164 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 23:39:50,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 23:39:50,164 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 23:39:50,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 23:39:50,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:50,164 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:50,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 23:39:50,165 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:50,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:50,165 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 23:39:50,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:50,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142573108] [2020-08-18 23:39:50,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:50,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:51,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:51,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:51,161 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:51,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142573108] [2020-08-18 23:39:51,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:51,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 23:39:51,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241013806] [2020-08-18 23:39:51,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 23:39:51,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:51,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 23:39:51,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 23:39:51,163 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 23:39:51,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:51,954 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 23:39:51,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 23:39:51,955 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 23:39:51,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:51,956 INFO L225 Difference]: With dead ends: 52 [2020-08-18 23:39:51,956 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 23:39:51,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 23:39:51,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 23:39:51,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 23:39:51,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 23:39:51,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 23:39:51,961 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 23:39:51,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:51,961 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 23:39:51,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 23:39:51,961 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 23:39:51,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 23:39:51,962 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:51,962 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:51,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 23:39:51,962 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:51,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:51,963 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 23:39:51,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:51,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2013808341] [2020-08-18 23:39:51,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:51,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:53,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:53,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:53,034 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:53,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2013808341] [2020-08-18 23:39:53,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:53,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 23:39:53,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898104881] [2020-08-18 23:39:53,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 23:39:53,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:53,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 23:39:53,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 23:39:53,037 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 23:39:53,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:53,887 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 23:39:53,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 23:39:53,890 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 23:39:53,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:53,890 INFO L225 Difference]: With dead ends: 53 [2020-08-18 23:39:53,891 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 23:39:53,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 23:39:53,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 23:39:53,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 23:39:53,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 23:39:53,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 23:39:53,897 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 23:39:53,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:53,897 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 23:39:53,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 23:39:53,898 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 23:39:53,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 23:39:53,898 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:53,898 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:53,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 23:39:53,899 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:53,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:53,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 23:39:53,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:53,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257516315] [2020-08-18 23:39:53,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:53,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:54,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,977 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:54,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257516315] [2020-08-18 23:39:54,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:54,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 23:39:54,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128324674] [2020-08-18 23:39:54,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 23:39:54,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:54,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 23:39:54,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 23:39:54,979 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 23:39:55,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:55,864 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 23:39:55,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 23:39:55,865 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 23:39:55,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:55,866 INFO L225 Difference]: With dead ends: 54 [2020-08-18 23:39:55,866 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 23:39:55,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 23:39:55,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 23:39:55,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 23:39:55,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 23:39:55,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 23:39:55,870 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 23:39:55,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:55,870 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 23:39:55,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 23:39:55,871 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 23:39:55,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 23:39:55,871 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:55,871 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:55,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 23:39:55,871 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:55,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:55,872 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 23:39:55,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:55,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924812039] [2020-08-18 23:39:55,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:55,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:56,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:56,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:56,998 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:56,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924812039] [2020-08-18 23:39:56,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:56,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 23:39:56,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996048211] [2020-08-18 23:39:56,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 23:39:56,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:56,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 23:39:56,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 23:39:57,000 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 23:39:57,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:57,951 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 23:39:57,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 23:39:57,952 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 23:39:57,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:57,952 INFO L225 Difference]: With dead ends: 55 [2020-08-18 23:39:57,952 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 23:39:57,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 23:39:57,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 23:39:57,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 23:39:57,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 23:39:57,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 23:39:57,957 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 23:39:57,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:57,957 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 23:39:57,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 23:39:57,957 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 23:39:57,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 23:39:57,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:57,958 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:57,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 23:39:57,958 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:57,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:57,959 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 23:39:57,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:57,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [119426871] [2020-08-18 23:39:57,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:57,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:59,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:59,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:59,174 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:59,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [119426871] [2020-08-18 23:39:59,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:59,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 23:39:59,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122989667] [2020-08-18 23:39:59,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 23:39:59,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:59,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 23:39:59,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 23:39:59,176 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 23:40:00,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:00,178 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 23:40:00,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 23:40:00,179 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 23:40:00,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:00,180 INFO L225 Difference]: With dead ends: 56 [2020-08-18 23:40:00,180 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 23:40:00,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 23:40:00,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 23:40:00,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 23:40:00,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 23:40:00,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 23:40:00,184 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 23:40:00,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:00,185 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 23:40:00,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 23:40:00,185 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 23:40:00,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 23:40:00,185 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:00,186 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:00,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 23:40:00,186 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:00,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:00,186 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 23:40:00,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:00,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424282587] [2020-08-18 23:40:00,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:00,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:01,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:01,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:01,480 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:01,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424282587] [2020-08-18 23:40:01,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:01,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 23:40:01,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107058984] [2020-08-18 23:40:01,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 23:40:01,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:01,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 23:40:01,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 23:40:01,482 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 23:40:02,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:02,577 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 23:40:02,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 23:40:02,577 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 23:40:02,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:02,578 INFO L225 Difference]: With dead ends: 57 [2020-08-18 23:40:02,578 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 23:40:02,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 23:40:02,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 23:40:02,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 23:40:02,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 23:40:02,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 23:40:02,583 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 23:40:02,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:02,583 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 23:40:02,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 23:40:02,584 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 23:40:02,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 23:40:02,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:02,584 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:02,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 23:40:02,585 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:02,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:02,585 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 23:40:02,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:02,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130290331] [2020-08-18 23:40:02,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:02,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:04,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:04,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:04,159 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:04,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130290331] [2020-08-18 23:40:04,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:04,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 23:40:04,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407840390] [2020-08-18 23:40:04,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 23:40:04,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:04,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 23:40:04,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 23:40:04,160 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 23:40:05,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:05,291 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 23:40:05,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 23:40:05,291 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 23:40:05,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:05,292 INFO L225 Difference]: With dead ends: 58 [2020-08-18 23:40:05,292 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 23:40:05,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 23:40:05,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 23:40:05,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 23:40:05,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 23:40:05,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 23:40:05,297 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 23:40:05,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:05,297 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 23:40:05,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 23:40:05,297 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 23:40:05,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 23:40:05,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:05,298 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:05,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 23:40:05,298 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:05,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:05,299 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 23:40:05,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:05,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259337671] [2020-08-18 23:40:05,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:05,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:06,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:06,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:06,876 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:06,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259337671] [2020-08-18 23:40:06,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:06,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 23:40:06,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648972035] [2020-08-18 23:40:06,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 23:40:06,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:06,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 23:40:06,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 23:40:06,878 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 23:40:08,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:08,106 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 23:40:08,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 23:40:08,107 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 23:40:08,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:08,108 INFO L225 Difference]: With dead ends: 59 [2020-08-18 23:40:08,109 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 23:40:08,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 23:40:08,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 23:40:08,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 23:40:08,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 23:40:08,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 23:40:08,113 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 23:40:08,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:08,113 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 23:40:08,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 23:40:08,113 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 23:40:08,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 23:40:08,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:08,114 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:08,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 23:40:08,114 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:08,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:08,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 23:40:08,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:08,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [440083541] [2020-08-18 23:40:08,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:08,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:09,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:09,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:09,584 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:09,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [440083541] [2020-08-18 23:40:09,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:09,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 23:40:09,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505748040] [2020-08-18 23:40:09,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 23:40:09,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:09,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 23:40:09,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 23:40:09,586 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 23:40:10,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:10,837 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 23:40:10,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 23:40:10,842 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 23:40:10,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:10,843 INFO L225 Difference]: With dead ends: 60 [2020-08-18 23:40:10,843 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 23:40:10,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 23:40:10,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 23:40:10,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 23:40:10,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 23:40:10,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 23:40:10,847 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 23:40:10,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:10,847 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 23:40:10,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 23:40:10,848 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 23:40:10,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 23:40:10,848 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:10,848 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:10,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 23:40:10,849 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:10,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:10,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 23:40:10,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:10,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1737673273] [2020-08-18 23:40:10,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:10,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:12,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:12,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:12,312 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:12,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1737673273] [2020-08-18 23:40:12,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:12,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 23:40:12,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353214156] [2020-08-18 23:40:12,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 23:40:12,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:12,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 23:40:12,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 23:40:12,314 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 23:40:13,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:13,595 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 23:40:13,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 23:40:13,596 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 23:40:13,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:13,597 INFO L225 Difference]: With dead ends: 61 [2020-08-18 23:40:13,597 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 23:40:13,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 23:40:13,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 23:40:13,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 23:40:13,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 23:40:13,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 23:40:13,602 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 23:40:13,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:13,602 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 23:40:13,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 23:40:13,603 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 23:40:13,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 23:40:13,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:13,603 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:13,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 23:40:13,604 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:13,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:13,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 23:40:13,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:13,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426803598] [2020-08-18 23:40:13,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:13,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:15,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:15,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:15,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:15,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426803598] [2020-08-18 23:40:15,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:15,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 23:40:15,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925943456] [2020-08-18 23:40:15,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 23:40:15,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:15,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 23:40:15,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 23:40:15,141 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 23:40:16,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:16,450 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 23:40:16,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 23:40:16,450 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 23:40:16,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:16,451 INFO L225 Difference]: With dead ends: 62 [2020-08-18 23:40:16,451 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 23:40:16,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 23:40:16,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 23:40:16,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 23:40:16,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 23:40:16,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 23:40:16,456 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 23:40:16,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:16,456 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 23:40:16,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 23:40:16,457 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 23:40:16,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 23:40:16,457 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:16,457 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:16,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 23:40:16,458 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:16,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:16,458 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 23:40:16,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:16,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191525673] [2020-08-18 23:40:16,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:16,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:18,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:18,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:18,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:18,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191525673] [2020-08-18 23:40:18,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:18,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 23:40:18,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29628429] [2020-08-18 23:40:18,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 23:40:18,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:18,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 23:40:18,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 23:40:18,039 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 23:40:19,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:19,433 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 23:40:19,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 23:40:19,434 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 23:40:19,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:19,435 INFO L225 Difference]: With dead ends: 63 [2020-08-18 23:40:19,435 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 23:40:19,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 23:40:19,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 23:40:19,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 23:40:19,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 23:40:19,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 23:40:19,440 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 23:40:19,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:19,440 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 23:40:19,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 23:40:19,441 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 23:40:19,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 23:40:19,441 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:19,441 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:19,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 23:40:19,441 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:19,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:19,442 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 23:40:19,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:19,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044156067] [2020-08-18 23:40:19,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:19,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:21,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:21,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:21,176 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:21,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044156067] [2020-08-18 23:40:21,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:21,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 23:40:21,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591513327] [2020-08-18 23:40:21,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 23:40:21,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:21,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 23:40:21,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 23:40:21,178 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-18 23:40:22,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:22,642 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 23:40:22,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 23:40:22,643 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-18 23:40:22,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:22,644 INFO L225 Difference]: With dead ends: 64 [2020-08-18 23:40:22,644 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 23:40:22,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 23:40:22,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 23:40:22,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-18 23:40:22,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 23:40:22,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 23:40:22,648 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-18 23:40:22,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:22,648 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 23:40:22,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 23:40:22,648 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 23:40:22,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 23:40:22,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:22,649 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:22,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 23:40:22,649 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:22,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:22,650 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-18 23:40:22,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:22,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1168873046] [2020-08-18 23:40:22,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:22,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat