/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:16:16,509 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:16:16,512 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:16:16,554 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:16:16,554 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:16:16,555 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:16:16,556 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:16:16,558 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:16:16,560 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:16:16,561 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:16:16,562 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:16:16,563 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:16:16,563 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:16:16,564 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:16:16,565 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:16:16,567 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:16:16,568 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:16:16,569 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:16:16,570 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:16:16,572 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:16:16,574 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:16:16,575 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:16:16,576 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:16:16,577 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:16:16,579 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 18:16:16,587 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:16:16,588 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:16:16,589 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:16:16,590 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 18:16:16,612 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:16:16,613 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:16:16,614 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:16:16,614 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:16:16,614 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:16:16,615 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:16:16,615 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:16:16,615 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:16:16,615 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:16:16,616 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:16:16,616 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:16:16,616 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:16:16,616 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:16:16,616 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:16:16,617 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:16:16,617 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:16:16,617 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:16:16,617 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:16:16,617 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:16:16,618 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:16:16,618 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:16:16,618 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:16:16,618 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:16:16,618 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:16:16,619 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:16:16,619 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:16:16,619 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:16:16,619 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:16:16,619 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:16:16,620 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:16:16,946 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:16:16,960 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:16:16,963 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:16:16,965 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:16:16,966 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:16:16,966 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 18:16:17,029 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/840eff664/4c30338abed24b4a93761a0f819e9593/FLAG33a5c320d [2020-08-21 18:16:17,483 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:16:17,484 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 18:16:17,490 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/840eff664/4c30338abed24b4a93761a0f819e9593/FLAG33a5c320d [2020-08-21 18:16:17,899 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/840eff664/4c30338abed24b4a93761a0f819e9593 [2020-08-21 18:16:17,910 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:16:17,912 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:16:17,916 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:16:17,916 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:16:17,920 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:16:17,921 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:16:17" (1/1) ... [2020-08-21 18:16:17,925 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4576fe6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:17, skipping insertion in model container [2020-08-21 18:16:17,925 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:16:17" (1/1) ... [2020-08-21 18:16:17,935 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:16:17,955 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:16:18,108 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:16:18,113 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:16:18,129 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:16:18,141 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:16:18,142 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18 WrapperNode [2020-08-21 18:16:18,142 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:16:18,143 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:16:18,143 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:16:18,143 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:16:18,153 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18" (1/1) ... [2020-08-21 18:16:18,153 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18" (1/1) ... [2020-08-21 18:16:18,158 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18" (1/1) ... [2020-08-21 18:16:18,159 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18" (1/1) ... [2020-08-21 18:16:18,244 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18" (1/1) ... [2020-08-21 18:16:18,250 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18" (1/1) ... [2020-08-21 18:16:18,251 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18" (1/1) ... [2020-08-21 18:16:18,253 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:16:18,253 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:16:18,253 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:16:18,254 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:16:18,254 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:16:18,310 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:16:18,310 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:16:18,311 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 18:16:18,311 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:16:18,311 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:16:18,311 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 18:16:18,311 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:16:18,311 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:16:18,312 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:16:18,483 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:16:18,483 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 18:16:18,487 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:16:18 BoogieIcfgContainer [2020-08-21 18:16:18,487 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:16:18,489 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:16:18,489 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:16:18,492 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:16:18,493 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:16:17" (1/3) ... [2020-08-21 18:16:18,494 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dc1dc8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:16:18, skipping insertion in model container [2020-08-21 18:16:18,494 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:18" (2/3) ... [2020-08-21 18:16:18,494 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dc1dc8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:16:18, skipping insertion in model container [2020-08-21 18:16:18,495 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:16:18" (3/3) ... [2020-08-21 18:16:18,497 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-21 18:16:18,510 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:16:18,517 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:16:18,530 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:16:18,556 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:16:18,556 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:16:18,556 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:16:18,556 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:16:18,557 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:16:18,557 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:16:18,557 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:16:18,557 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:16:18,575 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 18:16:18,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 18:16:18,581 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:18,582 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:18,582 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:18,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:18,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 18:16:18,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:18,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386108986] [2020-08-21 18:16:18,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:18,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:18,952 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 8 [2020-08-21 18:16:18,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:18,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:18,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:18,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386108986] [2020-08-21 18:16:18,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:16:18,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 18:16:18,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158902012] [2020-08-21 18:16:18,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 18:16:18,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:18,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 18:16:18,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:16:18,987 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 18:16:19,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:19,023 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 18:16:19,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 18:16:19,025 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 18:16:19,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:19,033 INFO L225 Difference]: With dead ends: 29 [2020-08-21 18:16:19,034 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 18:16:19,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:16:19,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 18:16:19,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 18:16:19,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 18:16:19,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 18:16:19,079 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 18:16:19,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:19,079 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 18:16:19,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 18:16:19,080 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 18:16:19,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 18:16:19,081 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:19,081 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:19,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:16:19,081 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:19,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:19,082 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 18:16:19,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:19,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758096235] [2020-08-21 18:16:19,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:19,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:19,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:19,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758096235] [2020-08-21 18:16:19,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:19,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 18:16:19,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568129544] [2020-08-21 18:16:19,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:16:19,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:19,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:16:19,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:16:19,175 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 18:16:19,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:19,200 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 18:16:19,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:16:19,201 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 18:16:19,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:19,202 INFO L225 Difference]: With dead ends: 18 [2020-08-21 18:16:19,202 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 18:16:19,203 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 [2020-08-21 18:16:19,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 18:16:19,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 18:16:19,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 18:16:19,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 18:16:19,209 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 18:16:19,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:19,209 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 18:16:19,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:16:19,209 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 18:16:19,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 18:16:19,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:19,210 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:19,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:16:19,211 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:19,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:19,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 18:16:19,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:19,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [405741093] [2020-08-21 18:16:19,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:19,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:19,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,329 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:19,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [405741093] [2020-08-21 18:16:19,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:19,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 18:16:19,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102234360] [2020-08-21 18:16:19,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:16:19,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:19,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:16:19,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:16:19,332 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 18:16:19,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:19,366 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 18:16:19,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:16:19,367 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 18:16:19,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:19,368 INFO L225 Difference]: With dead ends: 19 [2020-08-21 18:16:19,368 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 18:16:19,369 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 [2020-08-21 18:16:19,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 18:16:19,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 18:16:19,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 18:16:19,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 18:16:19,374 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 18:16:19,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:19,375 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 18:16:19,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:16:19,375 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 18:16:19,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 18:16:19,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:19,376 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:19,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:16:19,377 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:19,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:19,377 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 18:16:19,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:19,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098715793] [2020-08-21 18:16:19,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:19,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:19,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,488 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:19,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098715793] [2020-08-21 18:16:19,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:19,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 18:16:19,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885085336] [2020-08-21 18:16:19,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:16:19,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:19,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:16:19,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:16:19,491 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 18:16:19,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:19,516 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 18:16:19,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:16:19,517 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 18:16:19,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:19,517 INFO L225 Difference]: With dead ends: 20 [2020-08-21 18:16:19,518 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 18:16:19,518 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 [2020-08-21 18:16:19,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 18:16:19,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 18:16:19,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 18:16:19,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 18:16:19,524 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 18:16:19,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:19,524 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 18:16:19,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:16:19,524 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 18:16:19,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 18:16:19,525 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:19,525 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:19,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:16:19,526 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:19,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:19,526 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 18:16:19,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:19,527 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [691434596] [2020-08-21 18:16:19,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:19,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:19,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,649 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:19,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [691434596] [2020-08-21 18:16:19,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:19,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:16:19,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098050770] [2020-08-21 18:16:19,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:16:19,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:19,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:16:19,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:16:19,653 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 18:16:19,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:19,690 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 18:16:19,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:16:19,691 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 18:16:19,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:19,692 INFO L225 Difference]: With dead ends: 21 [2020-08-21 18:16:19,692 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 18:16:19,693 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 [2020-08-21 18:16:19,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 18:16:19,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 18:16:19,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 18:16:19,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 18:16:19,698 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 18:16:19,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:19,699 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 18:16:19,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:16:19,699 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 18:16:19,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 18:16:19,700 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:19,700 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:19,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:16:19,701 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:19,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:19,701 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 18:16:19,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:19,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1555459188] [2020-08-21 18:16:19,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:19,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:19,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,888 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:19,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1555459188] [2020-08-21 18:16:19,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:19,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:16:19,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525057778] [2020-08-21 18:16:19,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:16:19,890 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:19,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:16:19,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:16:19,891 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 18:16:19,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:19,934 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 18:16:19,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:16:19,934 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 18:16:19,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:19,935 INFO L225 Difference]: With dead ends: 22 [2020-08-21 18:16:19,935 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 18:16:19,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:16:19,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 18:16:19,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 18:16:19,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 18:16:19,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 18:16:19,941 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 18:16:19,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:19,941 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 18:16:19,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:16:19,942 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 18:16:19,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 18:16:19,942 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:19,943 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:19,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:16:19,943 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:19,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:19,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 18:16:19,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:19,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055926702] [2020-08-21 18:16:19,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:19,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:20,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,094 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:20,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055926702] [2020-08-21 18:16:20,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:20,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:16:20,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652881969] [2020-08-21 18:16:20,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:16:20,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:20,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:16:20,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:16:20,097 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 18:16:20,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:20,145 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 18:16:20,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:16:20,146 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 18:16:20,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:20,146 INFO L225 Difference]: With dead ends: 23 [2020-08-21 18:16:20,147 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 18:16:20,147 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 [2020-08-21 18:16:20,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 18:16:20,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 18:16:20,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 18:16:20,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 18:16:20,152 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 18:16:20,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:20,153 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 18:16:20,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:16:20,153 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 18:16:20,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 18:16:20,154 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:20,154 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:20,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:16:20,154 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:20,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:20,155 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 18:16:20,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:20,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198743849] [2020-08-21 18:16:20,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:20,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:20,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,304 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:20,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198743849] [2020-08-21 18:16:20,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:20,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 18:16:20,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674201009] [2020-08-21 18:16:20,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:16:20,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:20,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:16:20,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:16:20,306 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 18:16:20,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:20,363 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 18:16:20,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:16:20,363 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 18:16:20,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:20,364 INFO L225 Difference]: With dead ends: 24 [2020-08-21 18:16:20,364 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 18:16:20,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:16:20,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 18:16:20,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 18:16:20,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 18:16:20,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 18:16:20,370 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 18:16:20,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:20,371 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 18:16:20,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:16:20,371 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 18:16:20,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 18:16:20,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:20,372 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:20,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:16:20,372 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:20,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:20,373 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 18:16:20,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:20,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1442223888] [2020-08-21 18:16:20,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:20,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:20,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,532 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:20,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1442223888] [2020-08-21 18:16:20,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:20,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 18:16:20,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015984778] [2020-08-21 18:16:20,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:16:20,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:20,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:16:20,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:16:20,534 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 18:16:20,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:20,605 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 18:16:20,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 18:16:20,606 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 18:16:20,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:20,607 INFO L225 Difference]: With dead ends: 25 [2020-08-21 18:16:20,607 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 18:16:20,608 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 [2020-08-21 18:16:20,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 18:16:20,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 18:16:20,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 18:16:20,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 18:16:20,614 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 18:16:20,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:20,614 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 18:16:20,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:16:20,614 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 18:16:20,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 18:16:20,615 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:20,615 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:20,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:16:20,616 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:20,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:20,616 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 18:16:20,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:20,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117494356] [2020-08-21 18:16:20,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:20,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:20,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,802 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:20,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117494356] [2020-08-21 18:16:20,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:20,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 18:16:20,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646663222] [2020-08-21 18:16:20,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 18:16:20,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:20,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 18:16:20,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:16:20,805 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 18:16:20,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:20,901 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 18:16:20,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:16:20,902 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 18:16:20,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:20,902 INFO L225 Difference]: With dead ends: 26 [2020-08-21 18:16:20,903 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 18:16:20,903 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 [2020-08-21 18:16:20,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 18:16:20,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 18:16:20,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 18:16:20,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 18:16:20,908 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 18:16:20,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:20,909 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 18:16:20,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 18:16:20,909 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 18:16:20,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 18:16:20,910 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:20,910 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:20,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:16:20,910 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:20,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:20,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 18:16:20,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:20,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267684631] [2020-08-21 18:16:20,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:20,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:21,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:21,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:21,133 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:21,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267684631] [2020-08-21 18:16:21,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:21,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:16:21,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216217083] [2020-08-21 18:16:21,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:16:21,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:21,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:16:21,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:16:21,136 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 18:16:21,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:21,243 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 18:16:21,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 18:16:21,245 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 18:16:21,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:21,245 INFO L225 Difference]: With dead ends: 27 [2020-08-21 18:16:21,246 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 18:16:21,246 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 [2020-08-21 18:16:21,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 18:16:21,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 18:16:21,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 18:16:21,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 18:16:21,253 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 18:16:21,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:21,253 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 18:16:21,253 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:16:21,253 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 18:16:21,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 18:16:21,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:21,255 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:21,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:16:21,256 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:21,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:21,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 18:16:21,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:21,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623281154] [2020-08-21 18:16:21,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:21,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:21,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:21,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:21,447 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:21,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623281154] [2020-08-21 18:16:21,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:21,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 18:16:21,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491437893] [2020-08-21 18:16:21,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 18:16:21,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:21,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 18:16:21,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:16:21,449 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 18:16:21,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:21,572 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 18:16:21,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 18:16:21,573 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 18:16:21,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:21,574 INFO L225 Difference]: With dead ends: 28 [2020-08-21 18:16:21,574 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 18:16:21,575 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 [2020-08-21 18:16:21,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 18:16:21,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 18:16:21,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 18:16:21,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 18:16:21,580 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 18:16:21,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:21,581 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 18:16:21,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 18:16:21,581 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 18:16:21,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 18:16:21,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:21,582 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:21,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 18:16:21,583 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:21,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:21,583 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 18:16:21,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:21,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288633153] [2020-08-21 18:16:21,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:21,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:21,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:21,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:21,847 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:21,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288633153] [2020-08-21 18:16:21,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:21,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 18:16:21,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625989131] [2020-08-21 18:16:21,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 18:16:21,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:21,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 18:16:21,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:16:21,852 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 18:16:21,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:21,975 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 18:16:21,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 18:16:21,978 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 18:16:21,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:21,979 INFO L225 Difference]: With dead ends: 29 [2020-08-21 18:16:21,979 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 18:16:21,980 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 [2020-08-21 18:16:21,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 18:16:21,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 18:16:21,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 18:16:21,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 18:16:21,987 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 18:16:21,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:21,987 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 18:16:21,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 18:16:21,988 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 18:16:21,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 18:16:21,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:21,988 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:21,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 18:16:21,989 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:21,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:21,990 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 18:16:21,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:21,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054220113] [2020-08-21 18:16:21,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:22,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:22,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:22,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:22,231 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:22,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054220113] [2020-08-21 18:16:22,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:22,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 18:16:22,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714864653] [2020-08-21 18:16:22,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 18:16:22,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:22,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 18:16:22,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:16:22,233 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 18:16:22,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:22,367 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 18:16:22,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 18:16:22,368 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 18:16:22,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:22,368 INFO L225 Difference]: With dead ends: 30 [2020-08-21 18:16:22,368 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 18:16:22,369 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:16:22,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 18:16:22,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 18:16:22,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 18:16:22,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 18:16:22,376 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 18:16:22,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:22,377 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 18:16:22,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 18:16:22,378 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 18:16:22,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 18:16:22,379 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:22,379 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:22,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 18:16:22,379 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:22,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:22,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 18:16:22,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:22,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326074486] [2020-08-21 18:16:22,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:22,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:22,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:22,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:22,662 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:22,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326074486] [2020-08-21 18:16:22,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:22,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 18:16:22,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550501466] [2020-08-21 18:16:22,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 18:16:22,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:22,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 18:16:22,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:16:22,665 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 18:16:22,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:22,809 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 18:16:22,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:16:22,810 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 18:16:22,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:22,810 INFO L225 Difference]: With dead ends: 31 [2020-08-21 18:16:22,810 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 18:16:22,811 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 [2020-08-21 18:16:22,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 18:16:22,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 18:16:22,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 18:16:22,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 18:16:22,818 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 18:16:22,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:22,820 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 18:16:22,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 18:16:22,821 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 18:16:22,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 18:16:22,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:22,824 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:22,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 18:16:22,824 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:22,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:22,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 18:16:22,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:22,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894635909] [2020-08-21 18:16:22,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:22,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:23,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:23,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:23,088 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:23,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894635909] [2020-08-21 18:16:23,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:23,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 18:16:23,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107945439] [2020-08-21 18:16:23,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 18:16:23,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:23,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 18:16:23,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:16:23,090 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 18:16:23,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:23,248 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 18:16:23,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 18:16:23,249 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 18:16:23,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:23,249 INFO L225 Difference]: With dead ends: 32 [2020-08-21 18:16:23,249 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 18:16:23,250 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 [2020-08-21 18:16:23,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 18:16:23,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 18:16:23,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 18:16:23,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 18:16:23,255 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 18:16:23,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:23,256 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 18:16:23,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 18:16:23,256 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 18:16:23,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 18:16:23,257 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:23,257 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:23,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 18:16:23,257 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:23,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:23,257 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 18:16:23,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:23,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055512206] [2020-08-21 18:16:23,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:23,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:23,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:23,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:23,568 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:23,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055512206] [2020-08-21 18:16:23,569 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:23,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 18:16:23,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282002520] [2020-08-21 18:16:23,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 18:16:23,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:23,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 18:16:23,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:16:23,571 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 18:16:23,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:23,775 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 18:16:23,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 18:16:23,776 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 18:16:23,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:23,777 INFO L225 Difference]: With dead ends: 33 [2020-08-21 18:16:23,777 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 18:16:23,778 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 [2020-08-21 18:16:23,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 18:16:23,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 18:16:23,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 18:16:23,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 18:16:23,782 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 18:16:23,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:23,783 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 18:16:23,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 18:16:23,783 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 18:16:23,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 18:16:23,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:23,784 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:23,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 18:16:23,784 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:23,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:23,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 18:16:23,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:23,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285435082] [2020-08-21 18:16:23,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:23,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:24,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:24,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:24,160 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:24,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285435082] [2020-08-21 18:16:24,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:24,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 18:16:24,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532456983] [2020-08-21 18:16:24,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 18:16:24,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:24,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 18:16:24,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:16:24,167 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 18:16:24,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:24,379 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 18:16:24,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 18:16:24,380 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 18:16:24,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:24,380 INFO L225 Difference]: With dead ends: 34 [2020-08-21 18:16:24,380 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 18:16:24,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:16:24,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 18:16:24,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 18:16:24,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 18:16:24,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 18:16:24,386 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 18:16:24,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:24,386 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 18:16:24,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 18:16:24,387 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 18:16:24,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 18:16:24,387 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:24,387 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:24,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 18:16:24,388 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:24,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:24,388 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 18:16:24,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:24,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684078483] [2020-08-21 18:16:24,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:24,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:24,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:24,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:24,753 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:24,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684078483] [2020-08-21 18:16:24,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:24,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 18:16:24,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104899362] [2020-08-21 18:16:24,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 18:16:24,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:24,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 18:16:24,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:16:24,755 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 18:16:24,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:24,987 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 18:16:24,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 18:16:24,988 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 18:16:24,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:24,989 INFO L225 Difference]: With dead ends: 35 [2020-08-21 18:16:24,989 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 18:16:24,990 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 [2020-08-21 18:16:24,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 18:16:24,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 18:16:24,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 18:16:24,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 18:16:24,995 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 18:16:24,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:24,996 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 18:16:24,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 18:16:24,996 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 18:16:24,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 18:16:24,996 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:24,997 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:24,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 18:16:24,997 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:24,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:24,997 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 18:16:24,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:24,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981544879] [2020-08-21 18:16:24,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:25,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:25,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:25,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:25,369 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:25,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981544879] [2020-08-21 18:16:25,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:25,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 18:16:25,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525331539] [2020-08-21 18:16:25,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 18:16:25,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:25,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 18:16:25,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:16:25,371 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 18:16:25,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:25,616 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 18:16:25,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 18:16:25,617 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 18:16:25,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:25,618 INFO L225 Difference]: With dead ends: 36 [2020-08-21 18:16:25,618 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 18:16:25,619 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 [2020-08-21 18:16:25,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 18:16:25,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 18:16:25,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 18:16:25,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 18:16:25,624 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 18:16:25,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:25,624 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 18:16:25,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 18:16:25,625 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 18:16:25,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 18:16:25,625 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:25,625 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:25,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 18:16:25,626 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:25,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:25,626 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 18:16:25,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:25,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987834124] [2020-08-21 18:16:25,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:25,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:26,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:26,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:26,016 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:26,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987834124] [2020-08-21 18:16:26,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:26,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 18:16:26,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470624158] [2020-08-21 18:16:26,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 18:16:26,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:26,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 18:16:26,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:16:26,019 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 18:16:26,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:26,297 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 18:16:26,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 18:16:26,298 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 18:16:26,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:26,299 INFO L225 Difference]: With dead ends: 37 [2020-08-21 18:16:26,299 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 18:16:26,300 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 [2020-08-21 18:16:26,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 18:16:26,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 18:16:26,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 18:16:26,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 18:16:26,304 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 18:16:26,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:26,305 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 18:16:26,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 18:16:26,305 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 18:16:26,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 18:16:26,306 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:26,306 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:26,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 18:16:26,306 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:26,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:26,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 18:16:26,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:26,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116054996] [2020-08-21 18:16:26,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:26,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:26,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:26,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:26,739 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:26,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116054996] [2020-08-21 18:16:26,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:26,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 18:16:26,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879377818] [2020-08-21 18:16:26,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 18:16:26,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:26,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 18:16:26,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:16:26,741 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 18:16:27,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:27,062 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 18:16:27,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 18:16:27,065 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 18:16:27,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:27,066 INFO L225 Difference]: With dead ends: 38 [2020-08-21 18:16:27,066 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 18:16:27,067 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 [2020-08-21 18:16:27,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 18:16:27,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 18:16:27,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 18:16:27,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 18:16:27,072 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 18:16:27,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:27,072 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 18:16:27,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 18:16:27,073 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 18:16:27,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 18:16:27,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:27,073 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:27,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 18:16:27,074 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:27,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:27,074 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 18:16:27,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:27,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [304938430] [2020-08-21 18:16:27,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:27,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:27,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:27,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:27,538 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:27,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [304938430] [2020-08-21 18:16:27,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:27,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 18:16:27,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944988811] [2020-08-21 18:16:27,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 18:16:27,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:27,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 18:16:27,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 18:16:27,540 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 18:16:27,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:27,835 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 18:16:27,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 18:16:27,836 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 18:16:27,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:27,836 INFO L225 Difference]: With dead ends: 39 [2020-08-21 18:16:27,837 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 18:16:27,838 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 [2020-08-21 18:16:27,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 18:16:27,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 18:16:27,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 18:16:27,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 18:16:27,843 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 18:16:27,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:27,843 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 18:16:27,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 18:16:27,844 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 18:16:27,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 18:16:27,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:27,844 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:27,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 18:16:27,845 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:27,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:27,845 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 18:16:27,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:27,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292535406] [2020-08-21 18:16:27,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:27,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:28,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:28,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:28,343 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:28,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292535406] [2020-08-21 18:16:28,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:28,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 18:16:28,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760805738] [2020-08-21 18:16:28,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 18:16:28,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:28,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 18:16:28,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:16:28,349 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 18:16:28,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:28,729 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 18:16:28,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 18:16:28,729 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 18:16:28,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:28,730 INFO L225 Difference]: With dead ends: 40 [2020-08-21 18:16:28,730 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 18:16:28,731 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 [2020-08-21 18:16:28,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 18:16:28,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 18:16:28,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 18:16:28,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 18:16:28,736 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 18:16:28,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:28,736 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 18:16:28,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 18:16:28,737 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 18:16:28,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 18:16:28,737 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:28,738 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:28,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 18:16:28,738 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:28,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:28,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 18:16:28,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:28,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907472471] [2020-08-21 18:16:28,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:28,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:29,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:29,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:29,355 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:29,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907472471] [2020-08-21 18:16:29,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:29,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 18:16:29,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676709818] [2020-08-21 18:16:29,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 18:16:29,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:29,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 18:16:29,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 18:16:29,358 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 18:16:29,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:29,748 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 18:16:29,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 18:16:29,749 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 18:16:29,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:29,749 INFO L225 Difference]: With dead ends: 41 [2020-08-21 18:16:29,750 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 18:16:29,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 18:16:29,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 18:16:29,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 18:16:29,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 18:16:29,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 18:16:29,755 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 18:16:29,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:29,756 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 18:16:29,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 18:16:29,756 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 18:16:29,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 18:16:29,756 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:29,757 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:29,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 18:16:29,757 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:29,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:29,757 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 18:16:29,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:29,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1854207103] [2020-08-21 18:16:29,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:29,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:30,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:30,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:30,292 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:30,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1854207103] [2020-08-21 18:16:30,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:30,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 18:16:30,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357075570] [2020-08-21 18:16:30,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 18:16:30,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:30,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 18:16:30,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 18:16:30,295 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 18:16:30,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:30,711 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 18:16:30,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 18:16:30,712 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 18:16:30,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:30,713 INFO L225 Difference]: With dead ends: 42 [2020-08-21 18:16:30,722 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 18:16:30,723 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 [2020-08-21 18:16:30,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 18:16:30,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 18:16:30,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 18:16:30,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 18:16:30,734 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 18:16:30,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:30,734 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 18:16:30,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 18:16:30,735 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 18:16:30,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 18:16:30,735 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:30,735 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:30,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 18:16:30,736 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:30,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:30,736 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 18:16:30,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:30,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1775693275] [2020-08-21 18:16:30,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:30,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:31,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:31,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:31,319 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:31,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1775693275] [2020-08-21 18:16:31,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:31,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 18:16:31,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269407268] [2020-08-21 18:16:31,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 18:16:31,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:31,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 18:16:31,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 18:16:31,321 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 18:16:31,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:31,781 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 18:16:31,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 18:16:31,782 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 18:16:31,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:31,783 INFO L225 Difference]: With dead ends: 43 [2020-08-21 18:16:31,783 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 18:16:31,783 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 [2020-08-21 18:16:31,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 18:16:31,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 18:16:31,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 18:16:31,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 18:16:31,788 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 18:16:31,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:31,789 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 18:16:31,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 18:16:31,789 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 18:16:31,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 18:16:31,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:31,789 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:31,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 18:16:31,790 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:31,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:31,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 18:16:31,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:31,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754287505] [2020-08-21 18:16:31,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:31,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:32,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:32,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:32,618 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:32,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1754287505] [2020-08-21 18:16:32,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:32,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 18:16:32,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640685123] [2020-08-21 18:16:32,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 18:16:32,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:32,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 18:16:32,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 18:16:32,623 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 18:16:33,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:33,191 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 18:16:33,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 18:16:33,192 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 18:16:33,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:33,193 INFO L225 Difference]: With dead ends: 44 [2020-08-21 18:16:33,193 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 18:16:33,194 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 [2020-08-21 18:16:33,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 18:16:33,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 18:16:33,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 18:16:33,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 18:16:33,199 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 18:16:33,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:33,200 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 18:16:33,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 18:16:33,200 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 18:16:33,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 18:16:33,202 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:33,202 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:33,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 18:16:33,202 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:33,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:33,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 18:16:33,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:33,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [838061713] [2020-08-21 18:16:33,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:33,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:33,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:33,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:33,983 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:33,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [838061713] [2020-08-21 18:16:33,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:33,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 18:16:33,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956688728] [2020-08-21 18:16:33,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 18:16:33,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:33,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 18:16:33,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 18:16:33,984 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 18:16:34,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:34,510 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 18:16:34,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 18:16:34,510 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 18:16:34,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:34,511 INFO L225 Difference]: With dead ends: 45 [2020-08-21 18:16:34,511 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 18:16:34,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 18:16:34,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 18:16:34,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 18:16:34,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 18:16:34,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 18:16:34,519 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 18:16:34,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:34,519 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 18:16:34,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 18:16:34,520 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 18:16:34,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 18:16:34,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:34,520 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:34,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 18:16:34,521 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:34,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:34,521 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 18:16:34,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:34,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636453379] [2020-08-21 18:16:34,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:34,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:35,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:35,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:35,286 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:35,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636453379] [2020-08-21 18:16:35,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:35,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 18:16:35,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364757975] [2020-08-21 18:16:35,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 18:16:35,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:35,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 18:16:35,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:16:35,288 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 18:16:35,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:35,852 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 18:16:35,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 18:16:35,852 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 18:16:35,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:35,853 INFO L225 Difference]: With dead ends: 46 [2020-08-21 18:16:35,853 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 18:16:35,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:16:35,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 18:16:35,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 18:16:35,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 18:16:35,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 18:16:35,859 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 18:16:35,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:35,859 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 18:16:35,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 18:16:35,860 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 18:16:35,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 18:16:35,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:35,860 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:35,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 18:16:35,860 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:35,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:35,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 18:16:35,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:35,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243919653] [2020-08-21 18:16:35,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:35,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:36,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:36,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:36,595 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:36,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243919653] [2020-08-21 18:16:36,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:36,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 18:16:36,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712420837] [2020-08-21 18:16:36,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 18:16:36,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:36,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 18:16:36,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 18:16:36,597 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 18:16:37,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:37,202 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 18:16:37,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 18:16:37,204 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 18:16:37,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:37,205 INFO L225 Difference]: With dead ends: 47 [2020-08-21 18:16:37,205 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 18:16:37,206 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 [2020-08-21 18:16:37,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 18:16:37,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 18:16:37,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 18:16:37,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 18:16:37,210 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 18:16:37,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:37,210 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 18:16:37,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 18:16:37,210 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 18:16:37,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 18:16:37,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:37,211 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:37,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 18:16:37,211 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:37,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:37,211 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 18:16:37,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:37,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649310793] [2020-08-21 18:16:37,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:37,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:38,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:38,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:38,014 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:38,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649310793] [2020-08-21 18:16:38,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:38,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 18:16:38,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919456318] [2020-08-21 18:16:38,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 18:16:38,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:38,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 18:16:38,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 18:16:38,016 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 18:16:38,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:38,659 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 18:16:38,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 18:16:38,659 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 18:16:38,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:38,660 INFO L225 Difference]: With dead ends: 48 [2020-08-21 18:16:38,660 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 18:16:38,661 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 [2020-08-21 18:16:38,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 18:16:38,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 18:16:38,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 18:16:38,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 18:16:38,665 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 18:16:38,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:38,665 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 18:16:38,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 18:16:38,665 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 18:16:38,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 18:16:38,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:38,666 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:38,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 18:16:38,666 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:38,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:38,666 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 18:16:38,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:38,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [578492785] [2020-08-21 18:16:38,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:38,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:39,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,498 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:39,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [578492785] [2020-08-21 18:16:39,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:39,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 18:16:39,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446273121] [2020-08-21 18:16:39,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 18:16:39,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:39,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 18:16:39,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 18:16:39,500 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 18:16:40,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:40,224 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 18:16:40,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 18:16:40,224 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 18:16:40,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:40,225 INFO L225 Difference]: With dead ends: 49 [2020-08-21 18:16:40,225 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 18:16:40,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 18:16:40,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 18:16:40,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 18:16:40,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 18:16:40,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 18:16:40,230 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 18:16:40,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:40,230 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 18:16:40,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 18:16:40,231 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 18:16:40,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 18:16:40,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:40,231 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:40,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 18:16:40,232 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:40,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:40,232 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 18:16:40,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:40,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373369269] [2020-08-21 18:16:40,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:40,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:41,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:41,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:41,176 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:41,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373369269] [2020-08-21 18:16:41,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:41,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 18:16:41,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510596623] [2020-08-21 18:16:41,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 18:16:41,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:41,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 18:16:41,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 18:16:41,184 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 18:16:41,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:41,898 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 18:16:41,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 18:16:41,899 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 18:16:41,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:41,899 INFO L225 Difference]: With dead ends: 50 [2020-08-21 18:16:41,900 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 18:16:41,900 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 [2020-08-21 18:16:41,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 18:16:41,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 18:16:41,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 18:16:41,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 18:16:41,904 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 18:16:41,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:41,904 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 18:16:41,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 18:16:41,904 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 18:16:41,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 18:16:41,905 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:41,905 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:41,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 18:16:41,905 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:41,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:41,906 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 18:16:41,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:41,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662238343] [2020-08-21 18:16:41,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:41,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:42,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:42,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:42,874 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:42,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [662238343] [2020-08-21 18:16:42,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:42,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 18:16:42,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934917171] [2020-08-21 18:16:42,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 18:16:42,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:42,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 18:16:42,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 18:16:42,876 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 18:16:43,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:43,643 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 18:16:43,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 18:16:43,644 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 18:16:43,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:43,645 INFO L225 Difference]: With dead ends: 51 [2020-08-21 18:16:43,645 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 18:16:43,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 18:16:43,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 18:16:43,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 18:16:43,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 18:16:43,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 18:16:43,649 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 18:16:43,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:43,650 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 18:16:43,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 18:16:43,650 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 18:16:43,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 18:16:43,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:43,651 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:43,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 18:16:43,651 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:43,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:43,651 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 18:16:43,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:43,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814401670] [2020-08-21 18:16:43,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:43,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:44,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:44,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:44,628 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:44,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814401670] [2020-08-21 18:16:44,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:44,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 18:16:44,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698714378] [2020-08-21 18:16:44,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 18:16:44,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:44,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 18:16:44,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 18:16:44,630 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 18:16:45,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:45,453 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 18:16:45,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 18:16:45,454 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 18:16:45,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:45,454 INFO L225 Difference]: With dead ends: 52 [2020-08-21 18:16:45,455 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 18:16:45,455 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 [2020-08-21 18:16:45,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 18:16:45,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 18:16:45,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 18:16:45,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 18:16:45,459 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 18:16:45,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:45,460 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 18:16:45,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 18:16:45,460 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 18:16:45,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 18:16:45,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:45,460 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:45,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 18:16:45,461 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:45,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:45,461 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 18:16:45,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:45,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1285272516] [2020-08-21 18:16:45,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:45,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:46,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:46,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:46,496 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:46,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1285272516] [2020-08-21 18:16:46,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:46,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 18:16:46,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062071968] [2020-08-21 18:16:46,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 18:16:46,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:46,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 18:16:46,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 18:16:46,498 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 18:16:47,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:47,361 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 18:16:47,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 18:16:47,363 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 18:16:47,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:47,364 INFO L225 Difference]: With dead ends: 53 [2020-08-21 18:16:47,364 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 18:16:47,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 18:16:47,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 18:16:47,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 18:16:47,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 18:16:47,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 18:16:47,370 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 18:16:47,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:47,370 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 18:16:47,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 18:16:47,370 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 18:16:47,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 18:16:47,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:47,374 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:47,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 18:16:47,374 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:47,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:47,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 18:16:47,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:47,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703472586] [2020-08-21 18:16:47,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:47,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:48,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:48,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:48,482 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:48,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703472586] [2020-08-21 18:16:48,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:48,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 18:16:48,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843523146] [2020-08-21 18:16:48,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 18:16:48,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:48,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 18:16:48,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 18:16:48,484 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 18:16:49,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:49,396 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 18:16:49,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 18:16:49,397 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 18:16:49,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:49,398 INFO L225 Difference]: With dead ends: 54 [2020-08-21 18:16:49,398 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 18:16:49,399 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 [2020-08-21 18:16:49,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 18:16:49,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 18:16:49,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 18:16:49,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 18:16:49,403 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 18:16:49,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:49,403 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 18:16:49,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 18:16:49,404 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 18:16:49,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 18:16:49,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:49,404 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:49,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 18:16:49,405 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:49,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:49,405 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 18:16:49,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:49,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417517908] [2020-08-21 18:16:49,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:49,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:50,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:50,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:50,623 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:50,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417517908] [2020-08-21 18:16:50,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:50,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 18:16:50,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655843613] [2020-08-21 18:16:50,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 18:16:50,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:50,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 18:16:50,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 18:16:50,626 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 18:16:51,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:51,584 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 18:16:51,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 18:16:51,585 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 18:16:51,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:51,586 INFO L225 Difference]: With dead ends: 55 [2020-08-21 18:16:51,586 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 18:16:51,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 18:16:51,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 18:16:51,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 18:16:51,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 18:16:51,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 18:16:51,590 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 18:16:51,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:51,591 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 18:16:51,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 18:16:51,591 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 18:16:51,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 18:16:51,591 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:51,592 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:51,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 18:16:51,592 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:51,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:51,592 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 18:16:51,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:51,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412906091] [2020-08-21 18:16:51,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:51,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:52,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:52,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:52,851 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:52,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412906091] [2020-08-21 18:16:52,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:52,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 18:16:52,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119985002] [2020-08-21 18:16:52,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 18:16:52,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:52,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 18:16:52,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 18:16:52,853 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 18:16:53,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:53,877 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 18:16:53,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 18:16:53,880 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 18:16:53,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:53,881 INFO L225 Difference]: With dead ends: 56 [2020-08-21 18:16:53,881 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 18:16:53,882 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 [2020-08-21 18:16:53,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 18:16:53,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 18:16:53,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 18:16:53,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 18:16:53,885 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 18:16:53,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:53,886 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 18:16:53,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 18:16:53,886 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 18:16:53,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 18:16:53,886 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:53,886 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:53,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 18:16:53,887 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:53,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:53,887 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 18:16:53,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:53,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [999040832] [2020-08-21 18:16:53,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:53,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:55,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:55,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:55,151 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:55,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [999040832] [2020-08-21 18:16:55,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:55,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 18:16:55,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136561760] [2020-08-21 18:16:55,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 18:16:55,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:55,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 18:16:55,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 18:16:55,154 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 18:16:56,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:56,232 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 18:16:56,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 18:16:56,233 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 18:16:56,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:56,233 INFO L225 Difference]: With dead ends: 57 [2020-08-21 18:16:56,234 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 18:16:56,235 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 [2020-08-21 18:16:56,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 18:16:56,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 18:16:56,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 18:16:56,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 18:16:56,239 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 18:16:56,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:56,239 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 18:16:56,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 18:16:56,239 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 18:16:56,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 18:16:56,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:56,240 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:56,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 18:16:56,240 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:56,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:56,241 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 18:16:56,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:56,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2025770015] [2020-08-21 18:16:56,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:56,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:57,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:57,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:57,601 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:57,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2025770015] [2020-08-21 18:16:57,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:57,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 18:16:57,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553320985] [2020-08-21 18:16:57,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 18:16:57,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:57,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 18:16:57,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 18:16:57,603 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 18:16:58,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:58,715 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 18:16:58,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 18:16:58,716 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 18:16:58,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:58,717 INFO L225 Difference]: With dead ends: 58 [2020-08-21 18:16:58,717 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 18:16:58,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 18:16:58,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 18:16:58,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 18:16:58,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 18:16:58,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 18:16:58,721 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 18:16:58,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:58,722 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 18:16:58,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 18:16:58,722 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 18:16:58,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 18:16:58,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:58,723 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:58,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 18:16:58,723 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:58,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:58,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 18:16:58,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:58,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448566867] [2020-08-21 18:16:58,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:58,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:00,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:00,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:00,143 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:00,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448566867] [2020-08-21 18:17:00,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:00,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 18:17:00,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756879758] [2020-08-21 18:17:00,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 18:17:00,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:00,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 18:17:00,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 18:17:00,146 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 18:17:01,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:01,324 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 18:17:01,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 18:17:01,326 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 18:17:01,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:01,327 INFO L225 Difference]: With dead ends: 59 [2020-08-21 18:17:01,327 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 18:17:01,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 18:17:01,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 18:17:01,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 18:17:01,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 18:17:01,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 18:17:01,332 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 18:17:01,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:01,333 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 18:17:01,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 18:17:01,333 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 18:17:01,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 18:17:01,333 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:01,333 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:01,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 18:17:01,334 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:01,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:01,334 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 18:17:01,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:01,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1776168683] [2020-08-21 18:17:01,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:01,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:02,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:02,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:02,776 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:02,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1776168683] [2020-08-21 18:17:02,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:02,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 18:17:02,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718413651] [2020-08-21 18:17:02,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 18:17:02,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:02,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 18:17:02,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 18:17:02,779 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 18:17:04,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:04,015 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 18:17:04,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 18:17:04,016 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 18:17:04,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:04,017 INFO L225 Difference]: With dead ends: 60 [2020-08-21 18:17:04,017 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 18:17:04,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 18:17:04,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 18:17:04,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 18:17:04,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 18:17:04,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 18:17:04,021 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 18:17:04,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:04,021 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 18:17:04,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 18:17:04,021 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 18:17:04,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 18:17:04,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:04,022 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:04,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 18:17:04,022 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:04,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:04,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 18:17:04,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:04,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2120215114] [2020-08-21 18:17:04,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:04,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:05,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:05,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:05,559 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:05,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2120215114] [2020-08-21 18:17:05,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:05,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 18:17:05,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426753686] [2020-08-21 18:17:05,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 18:17:05,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:05,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 18:17:05,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 18:17:05,560 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 18:17:06,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:06,845 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 18:17:06,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 18:17:06,845 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 18:17:06,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:06,846 INFO L225 Difference]: With dead ends: 61 [2020-08-21 18:17:06,846 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 18:17:06,847 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 [2020-08-21 18:17:06,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 18:17:06,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 18:17:06,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 18:17:06,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 18:17:06,852 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 18:17:06,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:06,852 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 18:17:06,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 18:17:06,852 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 18:17:06,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 18:17:06,853 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:06,853 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:06,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 18:17:06,853 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:06,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:06,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 18:17:06,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:06,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [425681523] [2020-08-21 18:17:06,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:06,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:08,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:08,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:08,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:08,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [425681523] [2020-08-21 18:17:08,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:08,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 18:17:08,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610725566] [2020-08-21 18:17:08,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 18:17:08,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:08,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 18:17:08,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 18:17:08,451 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 18:17:09,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:09,780 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 18:17:09,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 18:17:09,781 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 18:17:09,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:09,781 INFO L225 Difference]: With dead ends: 62 [2020-08-21 18:17:09,782 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 18:17:09,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 18:17:09,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 18:17:09,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 18:17:09,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 18:17:09,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 18:17:09,787 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 18:17:09,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:09,787 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 18:17:09,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 18:17:09,787 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 18:17:09,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 18:17:09,788 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:09,788 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:09,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 18:17:09,788 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:09,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:09,789 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 18:17:09,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:09,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670098374] [2020-08-21 18:17:09,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:09,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:11,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:11,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:11,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:11,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670098374] [2020-08-21 18:17:11,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:11,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 18:17:11,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492030030] [2020-08-21 18:17:11,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 18:17:11,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:11,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 18:17:11,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 18:17:11,386 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 18:17:12,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:12,779 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 18:17:12,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 18:17:12,780 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 18:17:12,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:12,781 INFO L225 Difference]: With dead ends: 63 [2020-08-21 18:17:12,781 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 18:17:12,781 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 [2020-08-21 18:17:12,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 18:17:12,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 18:17:12,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 18:17:12,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 18:17:12,785 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 18:17:12,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:12,785 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 18:17:12,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 18:17:12,785 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 18:17:12,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 18:17:12,786 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:12,786 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:12,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 18:17:12,786 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:12,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:12,787 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 18:17:12,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:12,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128927976] [2020-08-21 18:17:12,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:12,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:14,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:14,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:14,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:14,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128927976] [2020-08-21 18:17:14,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:14,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 18:17:14,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376508738] [2020-08-21 18:17:14,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 18:17:14,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:14,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 18:17:14,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 18:17:14,557 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-21 18:17:16,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:16,124 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 18:17:16,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 18:17:16,125 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-21 18:17:16,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:16,126 INFO L225 Difference]: With dead ends: 64 [2020-08-21 18:17:16,126 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 18:17:16,127 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 [2020-08-21 18:17:16,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 18:17:16,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 18:17:16,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 18:17:16,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 18:17:16,131 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-21 18:17:16,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:16,131 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 18:17:16,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 18:17:16,131 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 18:17:16,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 18:17:16,132 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:16,132 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:16,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 18:17:16,132 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:16,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:16,132 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-21 18:17:16,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:16,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1944551534] [2020-08-21 18:17:16,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:16,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat