/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:26:12,355 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-18 20:26:12,403 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:26:12,416 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:26:12,419 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:26:12,421 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:26:12,425 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:26:12,426 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:26:12,428 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:26:12,430 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:26:12,431 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:26:12,435 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:26:12,436 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:26:12,437 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:26:12,441 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:26:12,442 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:26:12,443 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:26:12,450 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:26:12,453 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:26:12,454 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:26:12,455 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:26:12,456 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:26:12,460 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 20:26:12,471 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:26:12,472 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:26:12,473 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:26:12,474 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 20:26:12,519 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:26:12,519 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:26:12,522 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:26:12,522 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:26:12,522 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:26:12,522 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:26:12,523 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:26:12,523 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:26:12,523 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:26:12,523 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:26:12,525 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:26:12,525 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:26:12,525 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:26:12,526 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:26:12,526 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:26:12,526 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:26:12,526 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:26:12,526 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:26:12,527 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:26:12,527 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:26:12,527 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:26:12,527 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:26:12,527 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:26:12,528 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:26:12,528 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:26:12,528 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:26:12,528 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:26:12,528 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:26:12,529 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:26:12,529 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:26:12,881 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:26:12,893 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:26:12,897 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:26:12,898 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:26:12,899 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:26:12,900 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 20:26:12,959 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cbc4ad0a0/8307051b154648b48c944e844b35daac/FLAG5d757a638 [2020-08-18 20:26:13,413 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:26:13,413 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 20:26:13,421 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cbc4ad0a0/8307051b154648b48c944e844b35daac/FLAG5d757a638 [2020-08-18 20:26:13,840 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cbc4ad0a0/8307051b154648b48c944e844b35daac [2020-08-18 20:26:13,850 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:26:13,852 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:26:13,853 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:26:13,853 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:26:13,857 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:26:13,858 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:26:13" (1/1) ... [2020-08-18 20:26:13,861 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cc704b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:13, skipping insertion in model container [2020-08-18 20:26:13,861 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:26:13" (1/1) ... [2020-08-18 20:26:13,869 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:26:13,891 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:26:14,050 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:26:14,053 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:26:14,068 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:26:14,080 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:26:14,081 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14 WrapperNode [2020-08-18 20:26:14,081 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:26:14,081 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:26:14,082 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:26:14,082 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:26:14,092 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14" (1/1) ... [2020-08-18 20:26:14,092 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14" (1/1) ... [2020-08-18 20:26:14,173 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14" (1/1) ... [2020-08-18 20:26:14,173 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14" (1/1) ... [2020-08-18 20:26:14,181 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14" (1/1) ... [2020-08-18 20:26:14,190 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14" (1/1) ... [2020-08-18 20:26:14,191 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14" (1/1) ... [2020-08-18 20:26:14,200 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:26:14,201 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:26:14,201 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:26:14,201 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:26:14,202 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:26:14,263 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:26:14,263 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:26:14,263 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 20:26:14,264 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 20:26:14,264 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:26:14,264 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:26:14,264 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 20:26:14,264 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 20:26:14,264 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 20:26:14,264 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 20:26:14,265 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:26:14,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:26:14,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:26:14,486 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:26:14,487 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 20:26:14,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:26:14 BoogieIcfgContainer [2020-08-18 20:26:14,491 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:26:14,492 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:26:14,492 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:26:14,496 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:26:14,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:26:13" (1/3) ... [2020-08-18 20:26:14,497 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74168b86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:26:14, skipping insertion in model container [2020-08-18 20:26:14,497 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:14" (2/3) ... [2020-08-18 20:26:14,498 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74168b86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:26:14, skipping insertion in model container [2020-08-18 20:26:14,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:26:14" (3/3) ... [2020-08-18 20:26:14,499 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-18 20:26:14,513 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:26:14,521 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:26:14,541 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:26:14,573 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:26:14,573 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:26:14,573 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:26:14,573 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:26:14,573 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:26:14,573 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:26:14,574 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:26:14,574 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:26:14,597 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-18 20:26:14,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 20:26:14,607 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:14,608 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:14,608 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:14,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:14,625 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-18 20:26:14,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:14,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338176771] [2020-08-18 20:26:14,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:14,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:14,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,769 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:14,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338176771] [2020-08-18 20:26:14,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:26:14,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 20:26:14,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136260031] [2020-08-18 20:26:14,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 20:26:14,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:14,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 20:26:14,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 20:26:14,802 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-18 20:26:14,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:14,832 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-18 20:26:14,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 20:26:14,833 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-18 20:26:14,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:14,847 INFO L225 Difference]: With dead ends: 35 [2020-08-18 20:26:14,848 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 20:26:14,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 20:26:14,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 20:26:14,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 20:26:14,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 20:26:14,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 20:26:14,910 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-18 20:26:14,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:14,911 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 20:26:14,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 20:26:14,912 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 20:26:14,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 20:26:14,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:14,914 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:14,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:26:14,915 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:14,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:14,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-18 20:26:14,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:14,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1904612810] [2020-08-18 20:26:14,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:14,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:15,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:15,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1904612810] [2020-08-18 20:26:15,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:26:15,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 20:26:15,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431663888] [2020-08-18 20:26:15,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 20:26:15,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:15,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 20:26:15,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:26:15,035 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 20:26:15,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:15,066 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 20:26:15,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:26:15,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-18 20:26:15,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:15,068 INFO L225 Difference]: With dead ends: 24 [2020-08-18 20:26:15,069 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 20:26:15,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:26:15,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 20:26:15,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 20:26:15,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 20:26:15,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-18 20:26:15,081 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-18 20:26:15,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:15,081 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-18 20:26:15,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 20:26:15,082 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-18 20:26:15,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 20:26:15,083 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:15,084 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:15,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:26:15,087 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:15,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:15,089 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-18 20:26:15,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:15,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513366228] [2020-08-18 20:26:15,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:15,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:15,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:15,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513366228] [2020-08-18 20:26:15,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:26:15,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:26:15,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120514228] [2020-08-18 20:26:15,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:26:15,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:15,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:26:15,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:26:15,399 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-18 20:26:15,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:15,452 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-18 20:26:15,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:26:15,452 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 20:26:15,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:15,453 INFO L225 Difference]: With dead ends: 23 [2020-08-18 20:26:15,454 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 20:26:15,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:26:15,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 20:26:15,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 20:26:15,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 20:26:15,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-18 20:26:15,460 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-18 20:26:15,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:15,460 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-18 20:26:15,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:26:15,460 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-18 20:26:15,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 20:26:15,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:15,461 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:15,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:26:15,462 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:15,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:15,463 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-18 20:26:15,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:15,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118076056] [2020-08-18 20:26:15,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:15,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,647 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-18 20:26:15,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:15,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:15,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118076056] [2020-08-18 20:26:15,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:26:15,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 20:26:15,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217103501] [2020-08-18 20:26:15,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:26:15,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:15,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:26:15,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:26:15,656 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-18 20:26:15,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:15,679 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-18 20:26:15,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:26:15,680 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-18 20:26:15,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:15,680 INFO L225 Difference]: With dead ends: 26 [2020-08-18 20:26:15,681 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 20:26:15,681 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:26:15,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 20:26:15,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 20:26:15,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 20:26:15,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 20:26:15,686 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-18 20:26:15,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:15,686 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 20:26:15,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:26:15,687 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 20:26:15,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 20:26:15,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:15,688 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:15,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:26:15,688 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:15,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:15,689 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-18 20:26:15,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:15,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771100972] [2020-08-18 20:26:15,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:15,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:15,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:15,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771100972] [2020-08-18 20:26:15,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:15,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 20:26:15,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967274364] [2020-08-18 20:26:15,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:26:15,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:15,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:26:15,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:26:15,920 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-18 20:26:16,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:16,025 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 20:26:16,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 20:26:16,026 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-18 20:26:16,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:16,027 INFO L225 Difference]: With dead ends: 26 [2020-08-18 20:26:16,027 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 20:26:16,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:26:16,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 20:26:16,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 20:26:16,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 20:26:16,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 20:26:16,033 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-18 20:26:16,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:16,033 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 20:26:16,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:26:16,034 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 20:26:16,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 20:26:16,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:16,035 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:16,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:26:16,035 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:16,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:16,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-18 20:26:16,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:16,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1197811072] [2020-08-18 20:26:16,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:16,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:16,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,283 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:16,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1197811072] [2020-08-18 20:26:16,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:16,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:26:16,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412415062] [2020-08-18 20:26:16,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:26:16,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:16,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:26:16,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:26:16,286 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-18 20:26:16,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:16,410 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 20:26:16,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:26:16,411 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 20:26:16,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:16,412 INFO L225 Difference]: With dead ends: 29 [2020-08-18 20:26:16,412 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 20:26:16,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:26:16,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 20:26:16,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 20:26:16,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 20:26:16,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 20:26:16,417 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-18 20:26:16,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:16,417 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 20:26:16,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:26:16,418 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 20:26:16,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 20:26:16,418 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:16,418 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:16,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:26:16,419 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:16,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:16,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-18 20:26:16,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:16,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564771366] [2020-08-18 20:26:16,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:16,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:16,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,687 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:16,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564771366] [2020-08-18 20:26:16,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:16,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 20:26:16,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95592314] [2020-08-18 20:26:16,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 20:26:16,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:16,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 20:26:16,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:26:16,690 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-18 20:26:23,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:23,194 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 20:26:23,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:26:23,195 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-18 20:26:23,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:23,196 INFO L225 Difference]: With dead ends: 32 [2020-08-18 20:26:23,196 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 20:26:23,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=33, Invalid=147, Unknown=2, NotChecked=0, Total=182 [2020-08-18 20:26:23,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 20:26:23,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 20:26:23,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 20:26:23,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 20:26:23,202 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-18 20:26:23,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:23,203 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 20:26:23,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 20:26:23,203 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 20:26:23,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 20:26:23,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:23,204 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:23,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:26:23,205 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:23,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:23,205 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-18 20:26:23,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:23,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940517946] [2020-08-18 20:26:23,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:23,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:23,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:23,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:23,553 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:23,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940517946] [2020-08-18 20:26:23,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:23,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:26:23,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229985825] [2020-08-18 20:26:23,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:26:23,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:23,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:26:23,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:26:23,559 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-18 20:26:23,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:23,798 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 20:26:23,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 20:26:23,799 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-18 20:26:23,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:23,799 INFO L225 Difference]: With dead ends: 35 [2020-08-18 20:26:23,800 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 20:26:23,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:26:23,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 20:26:23,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 20:26:23,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 20:26:23,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 20:26:23,808 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-18 20:26:23,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:23,808 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 20:26:23,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:26:23,809 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 20:26:23,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 20:26:23,809 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:23,809 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:23,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:26:23,812 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:23,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:23,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-18 20:26:23,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:23,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592016852] [2020-08-18 20:26:23,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:23,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:24,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,291 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:24,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592016852] [2020-08-18 20:26:24,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:24,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 20:26:24,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818772798] [2020-08-18 20:26:24,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 20:26:24,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:24,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 20:26:24,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:26:24,294 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-18 20:26:28,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:28,796 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 20:26:28,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:26:28,797 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-18 20:26:28,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:28,800 INFO L225 Difference]: With dead ends: 38 [2020-08-18 20:26:28,800 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 20:26:28,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=41, Invalid=264, Unknown=1, NotChecked=0, Total=306 [2020-08-18 20:26:28,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 20:26:28,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 20:26:28,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 20:26:28,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 20:26:28,812 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-18 20:26:28,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:28,812 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 20:26:28,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 20:26:28,813 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 20:26:28,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 20:26:28,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:28,816 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:28,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:26:28,817 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:28,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:28,817 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-18 20:26:28,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:28,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1627925378] [2020-08-18 20:26:28,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:28,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:29,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:29,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:29,296 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:29,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1627925378] [2020-08-18 20:26:29,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:29,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 20:26:29,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463067178] [2020-08-18 20:26:29,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 20:26:29,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:29,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 20:26:29,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:26:29,299 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-18 20:26:40,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:40,149 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 20:26:40,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 20:26:40,150 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-18 20:26:40,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:40,151 INFO L225 Difference]: With dead ends: 41 [2020-08-18 20:26:40,151 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 20:26:40,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-18 20:26:40,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 20:26:40,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 20:26:40,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 20:26:40,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 20:26:40,156 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-18 20:26:40,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:40,156 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 20:26:40,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 20:26:40,157 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 20:26:40,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 20:26:40,159 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:40,159 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:40,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:26:40,159 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:40,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:40,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-18 20:26:40,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:40,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688290679] [2020-08-18 20:26:40,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:40,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:40,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:40,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:40,764 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:40,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688290679] [2020-08-18 20:26:40,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:40,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 20:26:40,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083187730] [2020-08-18 20:26:40,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 20:26:40,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:40,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 20:26:40,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:26:40,766 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-18 20:26:53,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:53,687 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 20:26:53,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 20:26:53,687 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-18 20:26:53,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:53,688 INFO L225 Difference]: With dead ends: 44 [2020-08-18 20:26:53,688 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 20:26:53,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-18 20:26:53,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 20:26:53,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 20:26:53,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 20:26:53,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 20:26:53,694 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-18 20:26:53,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:53,695 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 20:26:53,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 20:26:53,695 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 20:26:53,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 20:26:53,696 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:53,696 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:53,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:26:53,696 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:53,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:53,697 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-18 20:26:53,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:53,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2045632263] [2020-08-18 20:26:53,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:53,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:54,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:54,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:54,312 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:54,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2045632263] [2020-08-18 20:26:54,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:54,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 20:26:54,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730806830] [2020-08-18 20:26:54,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 20:26:54,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:54,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 20:26:54,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:26:54,317 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-18 20:26:54,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:54,752 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 20:26:54,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 20:26:54,753 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-18 20:26:54,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:54,754 INFO L225 Difference]: With dead ends: 47 [2020-08-18 20:26:54,754 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 20:26:54,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:26:54,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 20:26:54,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 20:26:54,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 20:26:54,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 20:26:54,760 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-18 20:26:54,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:54,761 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 20:26:54,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 20:26:54,761 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 20:26:54,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 20:26:54,762 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:54,762 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:54,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 20:26:54,762 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:54,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:54,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-18 20:26:54,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:54,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241926642] [2020-08-18 20:26:54,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:54,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:55,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:55,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:55,484 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:55,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241926642] [2020-08-18 20:26:55,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:55,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 20:26:55,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929518142] [2020-08-18 20:26:55,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 20:26:55,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:55,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 20:26:55,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:26:55,487 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-18 20:27:08,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:27:08,604 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 20:27:08,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 20:27:08,605 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-18 20:27:08,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:27:08,605 INFO L225 Difference]: With dead ends: 50 [2020-08-18 20:27:08,606 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 20:27:08,607 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=57, Invalid=590, Unknown=3, NotChecked=0, Total=650 [2020-08-18 20:27:08,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 20:27:08,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 20:27:08,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 20:27:08,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 20:27:08,611 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-18 20:27:08,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:27:08,612 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 20:27:08,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 20:27:08,612 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 20:27:08,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 20:27:08,613 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:27:08,613 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:27:08,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 20:27:08,613 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:27:08,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:27:08,614 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-18 20:27:08,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:27:08,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1935684823] [2020-08-18 20:27:08,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:27:08,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:27:09,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:27:09,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:27:09,456 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:27:09,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1935684823] [2020-08-18 20:27:09,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:27:09,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 20:27:09,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818836849] [2020-08-18 20:27:09,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 20:27:09,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:27:09,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 20:27:09,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:27:09,459 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states.