/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 03:42:42,077 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-19 03:42:42,121 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 03:42:42,122 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 03:42:42,123 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 03:42:42,124 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 03:42:42,125 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 03:42:42,126 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 03:42:42,128 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 03:42:42,130 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 03:42:42,132 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 03:42:42,133 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 03:42:42,134 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 03:42:42,135 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 03:42:42,137 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 03:42:42,145 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 03:42:42,146 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 03:42:42,147 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 03:42:42,148 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 03:42:42,174 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 03:42:42,174 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 03:42:42,175 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 03:42:42,175 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 03:42:42,176 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 03:42:42,176 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 03:42:42,176 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 03:42:42,176 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 03:42:42,176 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 03:42:42,177 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 03:42:42,177 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 03:42:42,177 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 03:42:42,177 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 03:42:42,177 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 03:42:42,177 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 03:42:42,178 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 03:42:42,178 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 03:42:42,178 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 03:42:42,178 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 03:42:42,178 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 03:42:42,179 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 03:42:42,179 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:42:42,179 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 03:42:42,179 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 03:42:42,179 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 03:42:42,180 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 03:42:42,180 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 03:42:42,180 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 03:42:42,180 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 03:42:42,180 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; [2020-08-19 03:42:42,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 03:42:42,483 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 03:42:42,487 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 03:42:42,488 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 03:42:42,489 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 03:42:42,489 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 03:42:42,566 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/732fe2e28/9caabbcb839c4572918edd98beff268b/FLAG5e42c67bb [2020-08-19 03:42:43,051 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 03:42:43,052 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 03:42:43,058 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/732fe2e28/9caabbcb839c4572918edd98beff268b/FLAG5e42c67bb [2020-08-19 03:42:43,426 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/732fe2e28/9caabbcb839c4572918edd98beff268b [2020-08-19 03:42:43,436 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 03:42:43,438 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 03:42:43,439 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 03:42:43,439 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 03:42:43,443 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 03:42:43,444 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:42:43" (1/1) ... [2020-08-19 03:42:43,447 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59f0ef37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43, skipping insertion in model container [2020-08-19 03:42:43,447 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:42:43" (1/1) ... [2020-08-19 03:42:43,455 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 03:42:43,473 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 03:42:43,665 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:42:43,670 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 03:42:43,683 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:42:43,697 INFO L208 MainTranslator]: Completed translation [2020-08-19 03:42:43,697 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43 WrapperNode [2020-08-19 03:42:43,697 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 03:42:43,698 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 03:42:43,698 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 03:42:43,698 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 03:42:43,709 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43" (1/1) ... [2020-08-19 03:42:43,709 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43" (1/1) ... [2020-08-19 03:42:43,714 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43" (1/1) ... [2020-08-19 03:42:43,714 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43" (1/1) ... [2020-08-19 03:42:43,718 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43" (1/1) ... [2020-08-19 03:42:43,727 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43" (1/1) ... [2020-08-19 03:42:43,728 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43" (1/1) ... [2020-08-19 03:42:43,816 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 03:42:43,820 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 03:42:43,820 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 03:42:43,820 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 03:42:43,821 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:42:43,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 03:42:43,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 03:42:43,893 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 03:42:43,893 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 03:42:43,893 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 03:42:43,894 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 03:42:43,894 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 03:42:43,894 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 03:42:43,894 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 03:42:43,894 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 03:42:43,894 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 03:42:43,895 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 03:42:43,895 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 03:42:44,084 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 03:42:44,084 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 03:42:44,089 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:42:44 BoogieIcfgContainer [2020-08-19 03:42:44,089 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 03:42:44,090 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 03:42:44,090 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 03:42:44,093 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 03:42:44,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 03:42:43" (1/3) ... [2020-08-19 03:42:44,095 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b258328 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:42:44, skipping insertion in model container [2020-08-19 03:42:44,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:43" (2/3) ... [2020-08-19 03:42:44,095 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b258328 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:42:44, skipping insertion in model container [2020-08-19 03:42:44,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:42:44" (3/3) ... [2020-08-19 03:42:44,097 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-19 03:42:44,109 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 03:42:44,116 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 03:42:44,138 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 03:42:44,169 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 03:42:44,169 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 03:42:44,169 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 03:42:44,169 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 03:42:44,170 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 03:42:44,170 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 03:42:44,170 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 03:42:44,170 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 03:42:44,193 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-19 03:42:44,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 03:42:44,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:44,200 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:44,201 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:44,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:44,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-19 03:42:44,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:44,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057086116] [2020-08-19 03:42:44,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:44,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:44,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:44,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057086116] [2020-08-19 03:42:44,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:42:44,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 03:42:44,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16626234] [2020-08-19 03:42:44,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 03:42:44,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:44,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 03:42:44,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 03:42:44,355 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-19 03:42:44,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:44,382 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-19 03:42:44,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 03:42:44,384 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-19 03:42:44,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:44,393 INFO L225 Difference]: With dead ends: 37 [2020-08-19 03:42:44,393 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 03:42:44,397 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 [2020-08-19 03:42:44,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 03:42:44,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 03:42:44,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 03:42:44,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-19 03:42:44,436 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-19 03:42:44,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:44,436 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-19 03:42:44,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 03:42:44,437 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-19 03:42:44,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 03:42:44,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:44,438 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:44,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 03:42:44,439 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:44,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:44,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-19 03:42:44,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:44,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162055086] [2020-08-19 03:42:44,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:44,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:44,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:44,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162055086] [2020-08-19 03:42:44,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:42:44,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 03:42:44,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40755311] [2020-08-19 03:42:44,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 03:42:44,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:44,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 03:42:44,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 03:42:44,494 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-19 03:42:44,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:44,510 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-19 03:42:44,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 03:42:44,510 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 03:42:44,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:44,511 INFO L225 Difference]: With dead ends: 20 [2020-08-19 03:42:44,512 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 03:42:44,513 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 [2020-08-19 03:42:44,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 03:42:44,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 03:42:44,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 03:42:44,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 03:42:44,518 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-19 03:42:44,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:44,519 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 03:42:44,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 03:42:44,519 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 03:42:44,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 03:42:44,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:44,520 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:44,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 03:42:44,521 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:44,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:44,521 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-19 03:42:44,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:44,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1935946741] [2020-08-19 03:42:44,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:44,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:44,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,569 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:44,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1935946741] [2020-08-19 03:42:44,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:42:44,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 03:42:44,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984152176] [2020-08-19 03:42:44,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 03:42:44,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:44,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 03:42:44,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 03:42:44,573 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 03:42:44,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:44,583 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-19 03:42:44,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 03:42:44,584 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-19 03:42:44,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:44,585 INFO L225 Difference]: With dead ends: 25 [2020-08-19 03:42:44,585 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 03:42:44,586 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 [2020-08-19 03:42:44,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 03:42:44,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 03:42:44,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 03:42:44,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 03:42:44,595 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-19 03:42:44,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:44,595 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 03:42:44,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 03:42:44,595 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 03:42:44,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 03:42:44,596 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:44,596 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:44,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 03:42:44,597 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:44,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:44,597 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-19 03:42:44,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:44,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975926169] [2020-08-19 03:42:44,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:44,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:44,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,688 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:44,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975926169] [2020-08-19 03:42:44,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:44,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 03:42:44,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619995614] [2020-08-19 03:42:44,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:42:44,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:44,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:42:44,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:42:44,692 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-19 03:42:44,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:44,775 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-19 03:42:44,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:42:44,776 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-19 03:42:44,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:44,777 INFO L225 Difference]: With dead ends: 26 [2020-08-19 03:42:44,778 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 03:42:44,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:42:44,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 03:42:44,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 03:42:44,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 03:42:44,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-19 03:42:44,785 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-19 03:42:44,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:44,785 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-19 03:42:44,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:42:44,786 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-19 03:42:44,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 03:42:44,786 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:44,787 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:44,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 03:42:44,788 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:44,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:44,788 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-19 03:42:44,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:44,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660122764] [2020-08-19 03:42:44,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:44,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:44,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,882 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:44,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660122764] [2020-08-19 03:42:44,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:44,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 03:42:44,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176673646] [2020-08-19 03:42:44,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 03:42:44,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:44,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 03:42:44,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:44,889 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-19 03:42:45,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:45,002 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-19 03:42:45,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 03:42:45,003 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-19 03:42:45,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:45,004 INFO L225 Difference]: With dead ends: 27 [2020-08-19 03:42:45,004 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 03:42:45,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:42:45,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 03:42:45,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 03:42:45,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 03:42:45,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-19 03:42:45,011 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-19 03:42:45,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:45,012 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-19 03:42:45,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 03:42:45,012 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-19 03:42:45,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 03:42:45,013 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:45,013 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:45,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 03:42:45,014 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:45,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:45,015 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-19 03:42:45,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:45,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [854975238] [2020-08-19 03:42:45,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:45,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,087 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:45,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [854975238] [2020-08-19 03:42:45,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 03:42:45,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990344326] [2020-08-19 03:42:45,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 03:42:45,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 03:42:45,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:42:45,091 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-19 03:42:45,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:45,204 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-19 03:42:45,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 03:42:45,204 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-19 03:42:45,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:45,205 INFO L225 Difference]: With dead ends: 28 [2020-08-19 03:42:45,206 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 03:42:45,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:42:45,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 03:42:45,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 03:42:45,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 03:42:45,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-19 03:42:45,213 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-19 03:42:45,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:45,214 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-19 03:42:45,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 03:42:45,214 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-19 03:42:45,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 03:42:45,215 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:45,215 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:45,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 03:42:45,216 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:45,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:45,216 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-19 03:42:45,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:45,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847822211] [2020-08-19 03:42:45,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:45,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,348 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:45,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847822211] [2020-08-19 03:42:45,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 03:42:45,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861060415] [2020-08-19 03:42:45,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 03:42:45,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 03:42:45,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:42:45,350 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-19 03:42:45,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:45,478 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 03:42:45,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 03:42:45,479 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-19 03:42:45,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:45,480 INFO L225 Difference]: With dead ends: 29 [2020-08-19 03:42:45,480 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 03:42:45,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:42:45,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 03:42:45,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 03:42:45,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 03:42:45,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-19 03:42:45,486 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-19 03:42:45,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:45,487 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-19 03:42:45,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 03:42:45,487 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-19 03:42:45,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 03:42:45,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:45,488 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:45,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 03:42:45,488 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:45,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:45,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-19 03:42:45,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:45,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539527388] [2020-08-19 03:42:45,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:45,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,581 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:45,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539527388] [2020-08-19 03:42:45,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 03:42:45,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996544833] [2020-08-19 03:42:45,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 03:42:45,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 03:42:45,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:42:45,583 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-19 03:42:45,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:45,755 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-19 03:42:45,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 03:42:45,756 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 03:42:45,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:45,757 INFO L225 Difference]: With dead ends: 30 [2020-08-19 03:42:45,757 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 03:42:45,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-19 03:42:45,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 03:42:45,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 03:42:45,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 03:42:45,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-19 03:42:45,763 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-19 03:42:45,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:45,763 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-19 03:42:45,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 03:42:45,764 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-19 03:42:45,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 03:42:45,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:45,764 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:45,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 03:42:45,765 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:45,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:45,765 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-19 03:42:45,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:45,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506464720] [2020-08-19 03:42:45,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:45,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,797 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:45,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506464720] [2020-08-19 03:42:45,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 03:42:45,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227960219] [2020-08-19 03:42:45,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 03:42:45,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 03:42:45,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 03:42:45,800 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-19 03:42:45,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:45,817 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-19 03:42:45,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 03:42:45,818 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 03:42:45,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:45,819 INFO L225 Difference]: With dead ends: 30 [2020-08-19 03:42:45,819 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 03:42:45,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 03:42:45,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 03:42:45,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 03:42:45,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 03:42:45,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-19 03:42:45,825 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-19 03:42:45,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:45,826 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-19 03:42:45,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 03:42:45,826 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-19 03:42:45,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 03:42:45,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:45,827 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:45,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 03:42:45,827 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:45,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:45,828 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-19 03:42:45,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:45,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341635262] [2020-08-19 03:42:45,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:45,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,875 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:45,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341635262] [2020-08-19 03:42:45,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 03:42:45,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311091765] [2020-08-19 03:42:45,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:42:45,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:42:45,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:42:45,878 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-19 03:42:45,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:45,909 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-19 03:42:45,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:42:45,911 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-19 03:42:45,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:45,912 INFO L225 Difference]: With dead ends: 34 [2020-08-19 03:42:45,912 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 03:42:45,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:42:45,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 03:42:45,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 03:42:45,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 03:42:45,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-19 03:42:45,918 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-19 03:42:45,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:45,919 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-19 03:42:45,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:42:45,919 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-19 03:42:45,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 03:42:45,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:45,920 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:45,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 03:42:45,921 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:45,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:45,921 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-19 03:42:45,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:45,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2016042277] [2020-08-19 03:42:45,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:45,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,972 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:45,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2016042277] [2020-08-19 03:42:45,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 03:42:45,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47314362] [2020-08-19 03:42:45,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 03:42:45,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 03:42:45,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:45,975 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-19 03:42:46,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:46,002 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-19 03:42:46,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 03:42:46,003 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-19 03:42:46,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:46,004 INFO L225 Difference]: With dead ends: 38 [2020-08-19 03:42:46,004 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 03:42:46,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:46,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 03:42:46,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 03:42:46,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 03:42:46,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-19 03:42:46,011 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-19 03:42:46,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:46,011 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-19 03:42:46,011 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 03:42:46,012 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-19 03:42:46,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 03:42:46,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:46,013 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:46,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 03:42:46,013 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:46,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:46,014 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-19 03:42:46,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:46,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603413084] [2020-08-19 03:42:46,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:46,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:46,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,123 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:46,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603413084] [2020-08-19 03:42:46,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:46,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 03:42:46,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268815640] [2020-08-19 03:42:46,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 03:42:46,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:46,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 03:42:46,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:42:46,127 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-19 03:42:46,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:46,329 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-19 03:42:46,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 03:42:46,329 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-19 03:42:46,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:46,330 INFO L225 Difference]: With dead ends: 54 [2020-08-19 03:42:46,330 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 03:42:46,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-19 03:42:46,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 03:42:46,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 03:42:46,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 03:42:46,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-19 03:42:46,342 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-19 03:42:46,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:46,342 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-19 03:42:46,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 03:42:46,343 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-19 03:42:46,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 03:42:46,347 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:46,347 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:46,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 03:42:46,348 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:46,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:46,348 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-19 03:42:46,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:46,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937578194] [2020-08-19 03:42:46,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:46,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:46,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,452 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:46,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937578194] [2020-08-19 03:42:46,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:46,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 03:42:46,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905107628] [2020-08-19 03:42:46,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 03:42:46,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:46,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 03:42:46,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:42:46,455 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-19 03:42:46,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:46,667 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-19 03:42:46,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 03:42:46,667 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-19 03:42:46,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:46,668 INFO L225 Difference]: With dead ends: 55 [2020-08-19 03:42:46,668 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 03:42:46,669 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-19 03:42:46,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 03:42:46,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 03:42:46,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 03:42:46,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-19 03:42:46,675 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-19 03:42:46,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:46,675 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-19 03:42:46,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 03:42:46,675 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-19 03:42:46,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 03:42:46,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:46,676 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:46,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 03:42:46,676 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:46,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:46,677 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-19 03:42:46,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:46,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890739740] [2020-08-19 03:42:46,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:46,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:46,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,781 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:46,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890739740] [2020-08-19 03:42:46,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:46,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 03:42:46,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487921524] [2020-08-19 03:42:46,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 03:42:46,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:46,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 03:42:46,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-19 03:42:46,784 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-19 03:42:47,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:47,024 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-19 03:42:47,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 03:42:47,025 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-19 03:42:47,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:47,026 INFO L225 Difference]: With dead ends: 56 [2020-08-19 03:42:47,026 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 03:42:47,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:42:47,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 03:42:47,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 03:42:47,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 03:42:47,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-19 03:42:47,038 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-19 03:42:47,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:47,038 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-19 03:42:47,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 03:42:47,038 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-19 03:42:47,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 03:42:47,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:47,039 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:47,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 03:42:47,040 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:47,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:47,040 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-19 03:42:47,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:47,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428367545] [2020-08-19 03:42:47,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:47,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:47,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:47,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:47,195 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:47,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428367545] [2020-08-19 03:42:47,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:47,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 03:42:47,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533207963] [2020-08-19 03:42:47,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 03:42:47,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:47,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 03:42:47,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:42:47,198 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-19 03:42:47,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:47,539 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-19 03:42:47,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 03:42:47,541 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-19 03:42:47,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:47,542 INFO L225 Difference]: With dead ends: 57 [2020-08-19 03:42:47,542 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 03:42:47,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-19 03:42:47,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 03:42:47,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 03:42:47,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 03:42:47,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-19 03:42:47,554 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-19 03:42:47,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:47,554 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-19 03:42:47,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 03:42:47,555 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-19 03:42:47,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 03:42:47,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:47,555 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:47,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 03:42:47,556 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:47,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:47,557 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-19 03:42:47,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:47,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [201153246] [2020-08-19 03:42:47,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:47,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:47,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:47,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:47,681 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:47,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [201153246] [2020-08-19 03:42:47,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:47,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 03:42:47,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666492286] [2020-08-19 03:42:47,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 03:42:47,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:47,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 03:42:47,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-19 03:42:47,683 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-19 03:42:48,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:48,085 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-19 03:42:48,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 03:42:48,086 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 03:42:48,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:48,087 INFO L225 Difference]: With dead ends: 58 [2020-08-19 03:42:48,087 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 03:42:48,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-19 03:42:48,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 03:42:48,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 03:42:48,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 03:42:48,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-19 03:42:48,102 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-19 03:42:48,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:48,103 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-19 03:42:48,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 03:42:48,103 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-19 03:42:48,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 03:42:48,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:48,105 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:48,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 03:42:48,105 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:48,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:48,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-19 03:42:48,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:48,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2128979812] [2020-08-19 03:42:48,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:48,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:48,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,279 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:48,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2128979812] [2020-08-19 03:42:48,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:48,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 03:42:48,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564847059] [2020-08-19 03:42:48,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 03:42:48,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:48,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 03:42:48,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-19 03:42:48,281 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-19 03:42:48,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:48,701 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-19 03:42:48,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 03:42:48,706 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-19 03:42:48,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:48,707 INFO L225 Difference]: With dead ends: 59 [2020-08-19 03:42:48,707 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 03:42:48,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-19 03:42:48,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 03:42:48,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 03:42:48,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 03:42:48,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-19 03:42:48,715 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-19 03:42:48,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:48,715 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-19 03:42:48,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 03:42:48,716 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-19 03:42:48,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 03:42:48,716 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:48,716 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:48,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 03:42:48,718 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:48,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:48,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-19 03:42:48,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:48,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1637593932] [2020-08-19 03:42:48,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:48,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:48,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,893 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:48,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1637593932] [2020-08-19 03:42:48,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:48,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 03:42:48,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093010142] [2020-08-19 03:42:48,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 03:42:48,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:48,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 03:42:48,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-19 03:42:48,896 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-19 03:42:49,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:49,393 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-19 03:42:49,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 03:42:49,394 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-19 03:42:49,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:49,395 INFO L225 Difference]: With dead ends: 60 [2020-08-19 03:42:49,395 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 03:42:49,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:42:49,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 03:42:49,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 03:42:49,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 03:42:49,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-19 03:42:49,403 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-19 03:42:49,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:49,403 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-19 03:42:49,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 03:42:49,403 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-19 03:42:49,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 03:42:49,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:49,404 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:49,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 03:42:49,404 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:49,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:49,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-19 03:42:49,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:49,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903352733] [2020-08-19 03:42:49,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:49,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:49,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:49,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:49,590 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:49,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903352733] [2020-08-19 03:42:49,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:49,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 03:42:49,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172354746] [2020-08-19 03:42:49,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 03:42:49,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:49,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 03:42:49,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-19 03:42:49,592 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-19 03:42:50,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:50,096 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-19 03:42:50,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 03:42:50,097 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-19 03:42:50,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:50,098 INFO L225 Difference]: With dead ends: 61 [2020-08-19 03:42:50,098 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 03:42:50,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-19 03:42:50,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 03:42:50,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 03:42:50,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 03:42:50,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-19 03:42:50,114 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-19 03:42:50,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:50,118 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-19 03:42:50,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 03:42:50,118 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-19 03:42:50,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 03:42:50,119 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:50,119 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:50,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 03:42:50,119 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:50,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:50,120 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-19 03:42:50,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:50,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [615745333] [2020-08-19 03:42:50,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:50,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:50,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:50,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:50,356 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:50,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [615745333] [2020-08-19 03:42:50,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:50,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 03:42:50,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170145078] [2020-08-19 03:42:50,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 03:42:50,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:50,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 03:42:50,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-19 03:42:50,358 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-19 03:42:50,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:50,937 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-19 03:42:50,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 03:42:50,944 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-19 03:42:50,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:50,945 INFO L225 Difference]: With dead ends: 62 [2020-08-19 03:42:50,945 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 03:42:50,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 03:42:50,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 03:42:50,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 03:42:50,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 03:42:50,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-19 03:42:50,957 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-19 03:42:50,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:50,958 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-19 03:42:50,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 03:42:50,958 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-19 03:42:50,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 03:42:50,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:50,960 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:50,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 03:42:50,960 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:50,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:50,961 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-19 03:42:50,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:50,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567798638] [2020-08-19 03:42:50,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:50,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:51,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:51,204 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:51,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567798638] [2020-08-19 03:42:51,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:51,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 03:42:51,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735953302] [2020-08-19 03:42:51,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 03:42:51,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:51,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 03:42:51,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-19 03:42:51,206 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-19 03:42:51,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:51,888 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-19 03:42:51,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 03:42:51,890 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-19 03:42:51,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:51,891 INFO L225 Difference]: With dead ends: 63 [2020-08-19 03:42:51,891 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 03:42:51,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 03:42:51,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 03:42:51,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 03:42:51,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 03:42:51,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-19 03:42:51,900 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-19 03:42:51,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:51,900 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-19 03:42:51,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 03:42:51,900 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-19 03:42:51,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 03:42:51,901 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:51,901 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:51,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 03:42:51,901 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:51,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:51,902 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-19 03:42:51,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:51,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311970729] [2020-08-19 03:42:51,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:51,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:52,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:52,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:52,175 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:52,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311970729] [2020-08-19 03:42:52,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:52,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 03:42:52,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291941696] [2020-08-19 03:42:52,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 03:42:52,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:52,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 03:42:52,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-19 03:42:52,177 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-19 03:42:52,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:52,917 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-19 03:42:52,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 03:42:52,920 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-19 03:42:52,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:52,920 INFO L225 Difference]: With dead ends: 64 [2020-08-19 03:42:52,921 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 03:42:52,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 03:42:52,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 03:42:52,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 03:42:52,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 03:42:52,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-19 03:42:52,933 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-19 03:42:52,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:52,934 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-19 03:42:52,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 03:42:52,934 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-19 03:42:52,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 03:42:52,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:52,935 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:52,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 03:42:52,936 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:52,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:52,936 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-19 03:42:52,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:52,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [45388480] [2020-08-19 03:42:52,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:52,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:53,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:53,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:53,233 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:53,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [45388480] [2020-08-19 03:42:53,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:53,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 03:42:53,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067016473] [2020-08-19 03:42:53,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 03:42:53,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:53,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 03:42:53,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:42:53,236 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-19 03:42:54,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:54,057 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-19 03:42:54,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 03:42:54,058 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-19 03:42:54,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:54,058 INFO L225 Difference]: With dead ends: 65 [2020-08-19 03:42:54,059 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 03:42:54,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 03:42:54,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 03:42:54,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 03:42:54,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 03:42:54,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-19 03:42:54,066 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-19 03:42:54,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:54,066 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-19 03:42:54,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 03:42:54,066 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-19 03:42:54,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 03:42:54,067 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:54,067 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:54,067 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 03:42:54,067 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:54,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:54,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-19 03:42:54,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:54,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150286318] [2020-08-19 03:42:54,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:54,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:54,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:54,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:54,385 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:54,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150286318] [2020-08-19 03:42:54,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:54,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 03:42:54,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001139494] [2020-08-19 03:42:54,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 03:42:54,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:54,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 03:42:54,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-19 03:42:54,386 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-19 03:42:55,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:55,304 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 03:42:55,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 03:42:55,304 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-19 03:42:55,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:55,305 INFO L225 Difference]: With dead ends: 66 [2020-08-19 03:42:55,306 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 03:42:55,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 03:42:55,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 03:42:55,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 03:42:55,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 03:42:55,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-19 03:42:55,314 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-19 03:42:55,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:55,314 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-19 03:42:55,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 03:42:55,315 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-19 03:42:55,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 03:42:55,315 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:55,315 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:55,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 03:42:55,316 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:55,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:55,316 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-19 03:42:55,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:55,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [235236229] [2020-08-19 03:42:55,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:55,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:55,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:55,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:55,657 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:55,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [235236229] [2020-08-19 03:42:55,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:55,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 03:42:55,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845961391] [2020-08-19 03:42:55,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 03:42:55,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:55,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 03:42:55,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-19 03:42:55,659 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-19 03:42:56,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:56,670 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-19 03:42:56,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 03:42:56,670 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-19 03:42:56,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:56,671 INFO L225 Difference]: With dead ends: 67 [2020-08-19 03:42:56,671 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 03:42:56,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 03:42:56,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 03:42:56,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 03:42:56,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 03:42:56,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-19 03:42:56,679 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-19 03:42:56,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:56,679 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-19 03:42:56,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 03:42:56,679 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-19 03:42:56,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 03:42:56,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:56,680 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:56,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 03:42:56,680 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:56,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:56,680 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-19 03:42:56,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:56,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1002899892] [2020-08-19 03:42:56,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:56,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:57,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:57,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:57,084 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:57,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1002899892] [2020-08-19 03:42:57,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:57,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 03:42:57,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136763812] [2020-08-19 03:42:57,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 03:42:57,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:57,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 03:42:57,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-19 03:42:57,088 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-19 03:42:58,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:58,200 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-19 03:42:58,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 03:42:58,206 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-19 03:42:58,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:58,207 INFO L225 Difference]: With dead ends: 68 [2020-08-19 03:42:58,207 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 03:42:58,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 03:42:58,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 03:42:58,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 03:42:58,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 03:42:58,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-19 03:42:58,223 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-19 03:42:58,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:58,223 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-19 03:42:58,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 03:42:58,223 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-19 03:42:58,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 03:42:58,224 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:58,224 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:58,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 03:42:58,225 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:58,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:58,225 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-19 03:42:58,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:58,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119520405] [2020-08-19 03:42:58,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:58,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:58,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:58,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:58,643 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 03:42:58,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119520405] [2020-08-19 03:42:58,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:58,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 03:42:58,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553461712] [2020-08-19 03:42:58,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 03:42:58,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:58,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 03:42:58,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-19 03:42:58,645 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-19 03:42:59,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:59,842 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-19 03:42:59,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 03:42:59,842 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-19 03:42:59,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:59,843 INFO L225 Difference]: With dead ends: 69 [2020-08-19 03:42:59,843 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 03:42:59,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 03:42:59,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 03:42:59,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 03:42:59,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 03:42:59,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-19 03:42:59,851 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-19 03:42:59,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:59,852 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-19 03:42:59,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 03:42:59,852 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-19 03:42:59,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 03:42:59,852 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:59,852 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:59,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 03:42:59,853 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:59,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:59,853 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-19 03:42:59,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:59,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164729505] [2020-08-19 03:42:59,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:59,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:59,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:59,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:59,941 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-19 03:42:59,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164729505] [2020-08-19 03:42:59,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:42:59,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 03:42:59,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421951167] [2020-08-19 03:42:59,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:42:59,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:59,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:42:59,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:42:59,943 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-19 03:42:59,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:59,973 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 03:42:59,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:42:59,973 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-19 03:42:59,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:59,974 INFO L225 Difference]: With dead ends: 66 [2020-08-19 03:42:59,974 INFO L226 Difference]: Without dead ends: 0 [2020-08-19 03:42:59,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:59,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-19 03:42:59,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-19 03:42:59,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-19 03:42:59,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-19 03:42:59,976 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-19 03:42:59,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:59,976 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-19 03:42:59,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:42:59,976 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-19 03:42:59,976 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-19 03:42:59,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 03:42:59,980 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-19 03:43:00,268 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-08-19 03:43:00,275 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-19 03:43:00,275 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-19 03:43:00,275 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-19 03:43:00,275 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-19 03:43:00,275 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-19 03:43:00,275 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-19 03:43:00,276 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-19 03:43:00,276 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-19 03:43:00,276 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-19 03:43:00,276 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-19 03:43:00,276 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-19 03:43:00,276 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-19 03:43:00,277 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-19 03:43:00,277 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-19 03:43:00,277 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 03:43:00,277 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-19 03:43:00,279 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-19 03:43:00,279 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-19 03:43:00,279 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 03:43:00,279 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-19 03:43:00,280 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-19 03:43:00,280 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-19 03:43:00,280 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-19 03:43:00,280 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-19 03:43:00,280 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-19 03:43:00,313 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 03:43:00 BoogieIcfgContainer [2020-08-19 03:43:00,313 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 03:43:00,316 INFO L168 Benchmark]: Toolchain (without parser) took 16878.14 ms. Allocated memory was 146.8 MB in the beginning and 350.2 MB in the end (delta: 203.4 MB). Free memory was 102.7 MB in the beginning and 183.1 MB in the end (delta: -80.4 MB). Peak memory consumption was 123.0 MB. Max. memory is 7.1 GB. [2020-08-19 03:43:00,317 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 146.8 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-19 03:43:00,318 INFO L168 Benchmark]: CACSL2BoogieTranslator took 259.04 ms. Allocated memory is still 146.8 MB. Free memory was 102.5 MB in the beginning and 92.7 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-08-19 03:43:00,324 INFO L168 Benchmark]: Boogie Preprocessor took 121.62 ms. Allocated memory was 146.8 MB in the beginning and 202.4 MB in the end (delta: 55.6 MB). Free memory was 92.7 MB in the beginning and 181.4 MB in the end (delta: -88.7 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-08-19 03:43:00,325 INFO L168 Benchmark]: RCFGBuilder took 268.92 ms. Allocated memory is still 202.4 MB. Free memory was 181.4 MB in the beginning and 169.2 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-19 03:43:00,330 INFO L168 Benchmark]: TraceAbstraction took 16223.46 ms. Allocated memory was 202.4 MB in the beginning and 350.2 MB in the end (delta: 147.8 MB). Free memory was 168.6 MB in the beginning and 183.1 MB in the end (delta: -14.6 MB). Peak memory consumption was 133.3 MB. Max. memory is 7.1 GB. [2020-08-19 03:43:00,332 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 146.8 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 259.04 ms. Allocated memory is still 146.8 MB. Free memory was 102.5 MB in the beginning and 92.7 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 121.62 ms. Allocated memory was 146.8 MB in the beginning and 202.4 MB in the end (delta: 55.6 MB). Free memory was 92.7 MB in the beginning and 181.4 MB in the end (delta: -88.7 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 268.92 ms. Allocated memory is still 202.4 MB. Free memory was 181.4 MB in the beginning and 169.2 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 16223.46 ms. Allocated memory was 202.4 MB in the beginning and 350.2 MB in the end (delta: 147.8 MB). Free memory was 168.6 MB in the beginning and 183.1 MB in the end (delta: -14.6 MB). Peak memory consumption was 133.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.8s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 12.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.0s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...