/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 false -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 [2020-08-18 15:36:28,993 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-18 15:36:29,040 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 15:36:29,052 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 15:36:29,054 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 15:36:29,058 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 15:36:29,061 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 15:36:29,064 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 15:36:29,065 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 15:36:29,066 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 15:36:29,067 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 15:36:29,069 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 15:36:29,072 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 15:36:29,074 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 15:36:29,076 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 15:36:29,077 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 15:36:29,080 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 15:36:29,090 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 15:36:29,092 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 15:36:29,093 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 15:36:29,095 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 15:36:29,096 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 15:36:29,098 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 15:36:29,110 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 15:36:29,111 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 15:36:29,112 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 15:36:29,113 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 15:36:29,159 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 15:36:29,159 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 15:36:29,161 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 15:36:29,162 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 15:36:29,162 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 15:36:29,162 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 15:36:29,163 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 15:36:29,163 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 15:36:29,164 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 15:36:29,164 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 15:36:29,165 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 15:36:29,165 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 15:36:29,165 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 15:36:29,166 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 15:36:29,166 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 15:36:29,166 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 15:36:29,166 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 15:36:29,167 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 15:36:29,167 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 15:36:29,167 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 15:36:29,167 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 15:36:29,167 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 15:36:29,168 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 15:36:29,168 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 15:36:29,168 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 15:36:29,168 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 15:36:29,168 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 15:36:29,169 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 15:36:29,169 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 15:36:29,169 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 -> false [2020-08-18 15:36:29,458 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 15:36:29,474 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 15:36:29,478 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 15:36:29,479 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 15:36:29,480 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 15:36:29,481 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 15:36:29,558 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6699f29f0/f9c67252e4e840dd8787a38d705a5091/FLAGfdb8fd735 [2020-08-18 15:36:30,050 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 15:36:30,051 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 15:36:30,056 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6699f29f0/f9c67252e4e840dd8787a38d705a5091/FLAGfdb8fd735 [2020-08-18 15:36:30,429 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6699f29f0/f9c67252e4e840dd8787a38d705a5091 [2020-08-18 15:36:30,438 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 15:36:30,440 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 15:36:30,441 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 15:36:30,441 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 15:36:30,445 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 15:36:30,446 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 03:36:30" (1/1) ... [2020-08-18 15:36:30,449 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ad4c324 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30, skipping insertion in model container [2020-08-18 15:36:30,449 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 03:36:30" (1/1) ... [2020-08-18 15:36:30,457 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 15:36:30,477 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 15:36:30,644 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 15:36:30,650 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 15:36:30,667 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 15:36:30,682 INFO L208 MainTranslator]: Completed translation [2020-08-18 15:36:30,683 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30 WrapperNode [2020-08-18 15:36:30,683 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 15:36:30,684 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 15:36:30,684 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 15:36:30,684 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 15:36:30,697 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30" (1/1) ... [2020-08-18 15:36:30,697 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30" (1/1) ... [2020-08-18 15:36:30,777 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30" (1/1) ... [2020-08-18 15:36:30,777 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30" (1/1) ... [2020-08-18 15:36:30,781 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30" (1/1) ... [2020-08-18 15:36:30,787 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30" (1/1) ... [2020-08-18 15:36:30,788 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30" (1/1) ... [2020-08-18 15:36:30,790 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 15:36:30,790 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 15:36:30,790 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 15:36:30,791 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 15:36:30,791 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 15:36:30,854 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 15:36:30,854 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 15:36:30,854 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 15:36:30,854 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 15:36:30,855 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 15:36:30,855 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 15:36:30,855 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 15:36:30,855 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 15:36:30,855 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 15:36:30,855 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 15:36:30,856 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 15:36:30,856 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 15:36:30,856 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 15:36:31,040 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 15:36:31,040 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 15:36:31,044 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 03:36:31 BoogieIcfgContainer [2020-08-18 15:36:31,044 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 15:36:31,045 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 15:36:31,045 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 15:36:31,048 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 15:36:31,049 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 03:36:30" (1/3) ... [2020-08-18 15:36:31,050 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52e32df9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 03:36:31, skipping insertion in model container [2020-08-18 15:36:31,050 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:30" (2/3) ... [2020-08-18 15:36:31,050 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52e32df9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 03:36:31, skipping insertion in model container [2020-08-18 15:36:31,051 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 03:36:31" (3/3) ... [2020-08-18 15:36:31,052 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-18 15:36:31,063 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 15:36:31,070 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 15:36:31,083 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 15:36:31,106 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 15:36:31,106 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 15:36:31,106 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 15:36:31,107 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 15:36:31,107 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 15:36:31,107 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 15:36:31,107 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 15:36:31,107 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 15:36:31,126 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 15:36:31,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 15:36:31,131 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:31,132 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:31,133 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:31,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:31,137 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-18 15:36:31,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:31,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916486378] [2020-08-18 15:36:31,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:31,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:31,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,243 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:31,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [916486378] [2020-08-18 15:36:31,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:36:31,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 15:36:31,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224592339] [2020-08-18 15:36:31,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 15:36:31,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:31,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 15:36:31,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 15:36:31,265 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-18 15:36:31,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:31,286 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-18 15:36:31,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 15:36:31,287 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 15:36:31,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:31,294 INFO L225 Difference]: With dead ends: 37 [2020-08-18 15:36:31,294 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 15:36:31,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 15:36:31,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 15:36:31,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 15:36:31,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 15:36:31,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-18 15:36:31,333 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-18 15:36:31,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:31,334 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-18 15:36:31,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 15:36:31,334 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-18 15:36:31,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 15:36:31,335 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:31,336 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:31,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 15:36:31,336 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:31,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:31,337 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-18 15:36:31,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:31,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846892483] [2020-08-18 15:36:31,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:31,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:31,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,397 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:31,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846892483] [2020-08-18 15:36:31,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:36:31,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 15:36:31,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272409716] [2020-08-18 15:36:31,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 15:36:31,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:31,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 15:36:31,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 15:36:31,401 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-18 15:36:31,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:31,417 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-18 15:36:31,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 15:36:31,418 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 15:36:31,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:31,420 INFO L225 Difference]: With dead ends: 20 [2020-08-18 15:36:31,420 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 15:36:31,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 15:36:31,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 15:36:31,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 15:36:31,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 15:36:31,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 15:36:31,428 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-18 15:36:31,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:31,428 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 15:36:31,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 15:36:31,429 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 15:36:31,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 15:36:31,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:31,430 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:31,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 15:36:31,430 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:31,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:31,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-18 15:36:31,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:31,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975290867] [2020-08-18 15:36:31,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:31,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:31,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:31,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975290867] [2020-08-18 15:36:31,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:36:31,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 15:36:31,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912776316] [2020-08-18 15:36:31,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 15:36:31,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:31,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 15:36:31,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 15:36:31,537 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 15:36:31,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:31,576 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-18 15:36:31,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 15:36:31,582 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-18 15:36:31,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:31,586 INFO L225 Difference]: With dead ends: 25 [2020-08-18 15:36:31,586 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 15:36:31,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 15:36:31,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 15:36:31,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 15:36:31,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 15:36:31,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 15:36:31,599 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-18 15:36:31,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:31,599 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 15:36:31,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 15:36:31,599 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 15:36:31,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 15:36:31,600 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:31,600 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:31,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 15:36:31,601 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:31,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:31,604 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-18 15:36:31,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:31,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489548886] [2020-08-18 15:36:31,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:31,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:31,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,658 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:31,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489548886] [2020-08-18 15:36:31,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:31,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 15:36:31,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610649989] [2020-08-18 15:36:31,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 15:36:31,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:31,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 15:36:31,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 15:36:31,662 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-18 15:36:31,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:31,727 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-18 15:36:31,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 15:36:31,728 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-18 15:36:31,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:31,729 INFO L225 Difference]: With dead ends: 26 [2020-08-18 15:36:31,729 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 15:36:31,730 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 [2020-08-18 15:36:31,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 15:36:31,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 15:36:31,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 15:36:31,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 15:36:31,739 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-18 15:36:31,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:31,740 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 15:36:31,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 15:36:31,740 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 15:36:31,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 15:36:31,741 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:31,741 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:31,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 15:36:31,742 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:31,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:31,742 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-18 15:36:31,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:31,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1760023722] [2020-08-18 15:36:31,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:31,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:31,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,804 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:31,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1760023722] [2020-08-18 15:36:31,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:31,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 15:36:31,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819217253] [2020-08-18 15:36:31,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 15:36:31,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:31,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 15:36:31,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 15:36:31,807 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-18 15:36:31,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:31,892 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-18 15:36:31,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 15:36:31,893 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 15:36:31,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:31,894 INFO L225 Difference]: With dead ends: 27 [2020-08-18 15:36:31,894 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 15:36:31,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-18 15:36:31,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 15:36:31,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 15:36:31,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 15:36:31,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 15:36:31,901 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-18 15:36:31,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:31,902 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 15:36:31,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 15:36:31,902 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 15:36:31,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 15:36:31,903 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:31,903 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:31,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 15:36:31,903 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:31,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:31,904 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-18 15:36:31,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:31,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [134468520] [2020-08-18 15:36:31,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:31,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:31,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,994 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:31,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [134468520] [2020-08-18 15:36:31,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:31,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 15:36:31,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349780840] [2020-08-18 15:36:31,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 15:36:31,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:31,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 15:36:31,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 15:36:31,997 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-18 15:36:32,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:32,103 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-18 15:36:32,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 15:36:32,104 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-18 15:36:32,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:32,105 INFO L225 Difference]: With dead ends: 28 [2020-08-18 15:36:32,105 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 15:36:32,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-18 15:36:32,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 15:36:32,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 15:36:32,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 15:36:32,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-18 15:36:32,113 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-18 15:36:32,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:32,114 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-18 15:36:32,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 15:36:32,114 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-18 15:36:32,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 15:36:32,115 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:32,115 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:32,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 15:36:32,116 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:32,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:32,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-18 15:36:32,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:32,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194227075] [2020-08-18 15:36:32,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:32,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:32,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,201 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:32,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194227075] [2020-08-18 15:36:32,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:32,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 15:36:32,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880898532] [2020-08-18 15:36:32,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 15:36:32,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:32,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 15:36:32,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-18 15:36:32,204 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-18 15:36:32,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:32,372 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 15:36:32,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 15:36:32,372 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-18 15:36:32,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:32,373 INFO L225 Difference]: With dead ends: 29 [2020-08-18 15:36:32,373 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 15:36:32,374 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 [2020-08-18 15:36:32,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 15:36:32,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 15:36:32,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 15:36:32,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 15:36:32,381 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-18 15:36:32,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:32,381 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 15:36:32,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 15:36:32,382 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 15:36:32,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 15:36:32,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:32,383 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:32,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 15:36:32,383 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:32,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:32,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-18 15:36:32,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:32,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407867826] [2020-08-18 15:36:32,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:32,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:32,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,483 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:32,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407867826] [2020-08-18 15:36:32,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:32,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 15:36:32,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341130145] [2020-08-18 15:36:32,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 15:36:32,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:32,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 15:36:32,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-18 15:36:32,487 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-18 15:36:32,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:32,662 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 15:36:32,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 15:36:32,663 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 15:36:32,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:32,664 INFO L225 Difference]: With dead ends: 30 [2020-08-18 15:36:32,664 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 15:36:32,665 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 [2020-08-18 15:36:32,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 15:36:32,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 15:36:32,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 15:36:32,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-18 15:36:32,671 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-18 15:36:32,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:32,672 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-18 15:36:32,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 15:36:32,672 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-18 15:36:32,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 15:36:32,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:32,673 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:32,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 15:36:32,673 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:32,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:32,674 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-18 15:36:32,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:32,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1147724361] [2020-08-18 15:36:32,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:32,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:32,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,714 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:32,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1147724361] [2020-08-18 15:36:32,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:32,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 15:36:32,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574695403] [2020-08-18 15:36:32,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 15:36:32,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:32,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 15:36:32,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 15:36:32,718 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-18 15:36:32,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:32,740 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-18 15:36:32,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 15:36:32,741 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 15:36:32,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:32,742 INFO L225 Difference]: With dead ends: 30 [2020-08-18 15:36:32,742 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 15:36:32,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 15:36:32,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 15:36:32,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 15:36:32,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 15:36:32,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-18 15:36:32,754 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-18 15:36:32,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:32,754 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-18 15:36:32,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 15:36:32,754 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-18 15:36:32,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 15:36:32,755 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:32,755 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:32,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 15:36:32,756 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:32,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:32,756 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-18 15:36:32,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:32,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1708754205] [2020-08-18 15:36:32,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:32,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:32,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,793 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:32,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1708754205] [2020-08-18 15:36:32,794 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:32,794 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 15:36:32,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712306192] [2020-08-18 15:36:32,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 15:36:32,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:32,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 15:36:32,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-18 15:36:32,796 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-18 15:36:32,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:32,816 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-18 15:36:32,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 15:36:32,817 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-18 15:36:32,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:32,818 INFO L225 Difference]: With dead ends: 34 [2020-08-18 15:36:32,818 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 15:36:32,818 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 [2020-08-18 15:36:32,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 15:36:32,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 15:36:32,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 15:36:32,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-18 15:36:32,825 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-18 15:36:32,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:32,825 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-18 15:36:32,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 15:36:32,826 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-18 15:36:32,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 15:36:32,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:32,827 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:32,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 15:36:32,827 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:32,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:32,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-18 15:36:32,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:32,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565506374] [2020-08-18 15:36:32,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:32,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:32,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,878 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:32,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565506374] [2020-08-18 15:36:32,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:32,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 15:36:32,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471931555] [2020-08-18 15:36:32,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 15:36:32,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:32,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 15:36:32,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-18 15:36:32,880 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-18 15:36:32,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:32,904 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-18 15:36:32,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 15:36:32,904 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-18 15:36:32,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:32,905 INFO L225 Difference]: With dead ends: 38 [2020-08-18 15:36:32,905 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 15:36:32,906 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 [2020-08-18 15:36:32,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 15:36:32,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 15:36:32,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 15:36:32,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-18 15:36:32,912 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-18 15:36:32,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:32,913 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-18 15:36:32,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 15:36:32,913 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-18 15:36:32,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 15:36:32,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:32,914 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:32,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 15:36:32,915 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:32,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:32,915 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-18 15:36:32,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:32,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267643812] [2020-08-18 15:36:32,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:32,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:33,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:33,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:33,042 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:33,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267643812] [2020-08-18 15:36:33,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:33,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 15:36:33,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329496146] [2020-08-18 15:36:33,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 15:36:33,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:33,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 15:36:33,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:36:33,046 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-18 15:36:33,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:33,255 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-18 15:36:33,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 15:36:33,255 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-18 15:36:33,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:33,256 INFO L225 Difference]: With dead ends: 54 [2020-08-18 15:36:33,256 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 15:36:33,257 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 [2020-08-18 15:36:33,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 15:36:33,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 15:36:33,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 15:36:33,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 15:36:33,270 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-18 15:36:33,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:33,271 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 15:36:33,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 15:36:33,272 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 15:36:33,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 15:36:33,274 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:33,275 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:33,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 15:36:33,275 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:33,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:33,275 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-18 15:36:33,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:33,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [258313908] [2020-08-18 15:36:33,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:33,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:33,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:33,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:33,404 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:33,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [258313908] [2020-08-18 15:36:33,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:33,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 15:36:33,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375026721] [2020-08-18 15:36:33,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 15:36:33,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:33,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 15:36:33,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-18 15:36:33,406 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-18 15:36:33,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:33,620 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-18 15:36:33,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 15:36:33,620 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-18 15:36:33,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:33,621 INFO L225 Difference]: With dead ends: 55 [2020-08-18 15:36:33,621 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 15:36:33,622 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 [2020-08-18 15:36:33,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 15:36:33,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 15:36:33,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 15:36:33,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-18 15:36:33,628 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-18 15:36:33,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:33,629 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-18 15:36:33,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 15:36:33,629 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-18 15:36:33,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 15:36:33,630 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:33,630 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:33,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 15:36:33,630 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:33,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:33,631 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-18 15:36:33,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:33,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157865466] [2020-08-18 15:36:33,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:33,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:33,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:33,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:33,767 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:33,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157865466] [2020-08-18 15:36:33,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:33,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 15:36:33,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122360560] [2020-08-18 15:36:33,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 15:36:33,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:33,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 15:36:33,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-18 15:36:33,769 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-18 15:36:33,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:33,999 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-18 15:36:34,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 15:36:34,000 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 15:36:34,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:34,001 INFO L225 Difference]: With dead ends: 56 [2020-08-18 15:36:34,001 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 15:36:34,003 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 [2020-08-18 15:36:34,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 15:36:34,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 15:36:34,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 15:36:34,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-18 15:36:34,013 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-18 15:36:34,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:34,014 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-18 15:36:34,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 15:36:34,014 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-18 15:36:34,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 15:36:34,017 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:34,017 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:34,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 15:36:34,017 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:34,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:34,018 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-18 15:36:34,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:34,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126883381] [2020-08-18 15:36:34,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:34,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:34,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:34,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:34,183 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:34,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126883381] [2020-08-18 15:36:34,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:34,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 15:36:34,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751097388] [2020-08-18 15:36:34,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 15:36:34,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:34,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 15:36:34,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-18 15:36:34,186 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-18 15:36:34,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:34,486 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-18 15:36:34,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 15:36:34,489 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-18 15:36:34,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:34,490 INFO L225 Difference]: With dead ends: 57 [2020-08-18 15:36:34,490 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 15:36:34,491 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 [2020-08-18 15:36:34,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 15:36:34,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 15:36:34,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 15:36:34,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-18 15:36:34,497 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-18 15:36:34,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:34,498 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-18 15:36:34,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 15:36:34,498 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-18 15:36:34,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 15:36:34,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:34,499 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:34,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 15:36:34,499 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:34,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:34,499 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-18 15:36:34,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:34,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209410904] [2020-08-18 15:36:34,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:34,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:34,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:34,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:34,624 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:34,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209410904] [2020-08-18 15:36:34,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:34,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 15:36:34,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435298131] [2020-08-18 15:36:34,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 15:36:34,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:34,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 15:36:34,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-18 15:36:34,626 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-18 15:36:34,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:34,993 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-18 15:36:34,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 15:36:34,994 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 15:36:34,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:34,995 INFO L225 Difference]: With dead ends: 58 [2020-08-18 15:36:34,995 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 15:36:34,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-18 15:36:34,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 15:36:35,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 15:36:35,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 15:36:35,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-18 15:36:35,013 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-18 15:36:35,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:35,014 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-18 15:36:35,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 15:36:35,014 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-18 15:36:35,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 15:36:35,015 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:35,015 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:35,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 15:36:35,019 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:35,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:35,020 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-18 15:36:35,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:35,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914907715] [2020-08-18 15:36:35,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:35,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:35,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:35,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:35,164 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:35,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914907715] [2020-08-18 15:36:35,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:35,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 15:36:35,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691164990] [2020-08-18 15:36:35,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 15:36:35,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:35,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 15:36:35,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-18 15:36:35,167 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-18 15:36:35,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:35,538 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-18 15:36:35,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 15:36:35,539 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 15:36:35,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:35,541 INFO L225 Difference]: With dead ends: 59 [2020-08-18 15:36:35,541 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 15:36:35,542 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 [2020-08-18 15:36:35,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 15:36:35,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 15:36:35,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 15:36:35,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-18 15:36:35,548 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-18 15:36:35,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:35,549 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-18 15:36:35,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 15:36:35,549 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-18 15:36:35,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 15:36:35,550 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:35,550 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:35,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 15:36:35,551 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:35,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:35,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-18 15:36:35,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:35,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889351019] [2020-08-18 15:36:35,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:35,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:35,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:35,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:35,728 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:35,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889351019] [2020-08-18 15:36:35,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:35,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 15:36:35,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387572557] [2020-08-18 15:36:35,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 15:36:35,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:35,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 15:36:35,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-18 15:36:35,730 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-18 15:36:36,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:36,185 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-18 15:36:36,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 15:36:36,186 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 15:36:36,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:36,187 INFO L225 Difference]: With dead ends: 60 [2020-08-18 15:36:36,187 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 15:36:36,188 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 [2020-08-18 15:36:36,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 15:36:36,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 15:36:36,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 15:36:36,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-18 15:36:36,202 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-18 15:36:36,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:36,202 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-18 15:36:36,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 15:36:36,202 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-18 15:36:36,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 15:36:36,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:36,203 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:36,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 15:36:36,203 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:36,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:36,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-18 15:36:36,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:36,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531479546] [2020-08-18 15:36:36,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:36,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:36,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:36,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:36,435 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:36,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531479546] [2020-08-18 15:36:36,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:36,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 15:36:36,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657201400] [2020-08-18 15:36:36,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 15:36:36,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:36,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 15:36:36,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-18 15:36:36,444 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-18 15:36:36,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:36,959 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-18 15:36:36,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 15:36:36,963 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-18 15:36:36,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:36,964 INFO L225 Difference]: With dead ends: 61 [2020-08-18 15:36:36,964 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 15:36:36,967 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 [2020-08-18 15:36:36,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 15:36:36,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 15:36:36,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 15:36:36,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-18 15:36:36,978 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-18 15:36:36,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:36,979 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-18 15:36:36,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 15:36:36,979 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-18 15:36:36,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 15:36:36,984 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:36,984 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:36,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 15:36:36,985 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:36,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:36,985 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-18 15:36:36,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:36,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [639824985] [2020-08-18 15:36:36,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:37,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:37,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:37,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:37,207 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:37,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [639824985] [2020-08-18 15:36:37,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:37,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 15:36:37,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136566450] [2020-08-18 15:36:37,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 15:36:37,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:37,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 15:36:37,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-18 15:36:37,209 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-18 15:36:37,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:37,781 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-18 15:36:37,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 15:36:37,787 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 15:36:37,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:37,788 INFO L225 Difference]: With dead ends: 62 [2020-08-18 15:36:37,788 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 15:36:37,789 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 [2020-08-18 15:36:37,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 15:36:37,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 15:36:37,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 15:36:37,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-18 15:36:37,795 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-18 15:36:37,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:37,796 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-18 15:36:37,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 15:36:37,796 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-18 15:36:37,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 15:36:37,797 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:37,797 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:37,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 15:36:37,797 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:37,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:37,797 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-18 15:36:37,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:37,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490154982] [2020-08-18 15:36:37,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:37,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:38,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:38,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:38,037 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:38,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490154982] [2020-08-18 15:36:38,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:38,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 15:36:38,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884881241] [2020-08-18 15:36:38,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 15:36:38,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:38,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 15:36:38,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-18 15:36:38,039 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-18 15:36:38,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:38,683 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 15:36:38,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 15:36:38,684 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-18 15:36:38,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:38,685 INFO L225 Difference]: With dead ends: 63 [2020-08-18 15:36:38,685 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 15:36:38,686 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 [2020-08-18 15:36:38,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 15:36:38,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 15:36:38,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 15:36:38,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-18 15:36:38,692 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-18 15:36:38,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:38,692 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-18 15:36:38,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 15:36:38,693 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-18 15:36:38,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 15:36:38,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:38,693 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:38,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 15:36:38,694 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:38,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:38,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-18 15:36:38,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:38,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [479890078] [2020-08-18 15:36:38,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:38,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:38,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:38,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:38,966 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:38,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [479890078] [2020-08-18 15:36:38,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:38,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 15:36:38,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63132577] [2020-08-18 15:36:38,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 15:36:38,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:38,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 15:36:38,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-18 15:36:38,968 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-18 15:36:39,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:39,656 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-18 15:36:39,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 15:36:39,659 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-18 15:36:39,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:39,660 INFO L225 Difference]: With dead ends: 64 [2020-08-18 15:36:39,660 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 15:36:39,661 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 [2020-08-18 15:36:39,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 15:36:39,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 15:36:39,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 15:36:39,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-18 15:36:39,669 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-18 15:36:39,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:39,669 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-18 15:36:39,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 15:36:39,670 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-18 15:36:39,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 15:36:39,670 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:39,670 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:39,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 15:36:39,671 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:39,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:39,671 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-18 15:36:39,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:39,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606274532] [2020-08-18 15:36:39,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:39,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:39,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:39,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:39,963 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:39,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606274532] [2020-08-18 15:36:39,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:39,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 15:36:39,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932387717] [2020-08-18 15:36:39,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 15:36:39,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:39,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 15:36:39,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-18 15:36:39,965 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-18 15:36:40,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:40,786 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-18 15:36:40,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 15:36:40,786 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-18 15:36:40,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:40,787 INFO L225 Difference]: With dead ends: 65 [2020-08-18 15:36:40,787 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 15:36:40,788 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 [2020-08-18 15:36:40,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 15:36:40,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 15:36:40,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 15:36:40,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-18 15:36:40,796 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-18 15:36:40,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:40,796 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-18 15:36:40,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 15:36:40,796 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-18 15:36:40,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 15:36:40,797 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:40,797 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:40,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 15:36:40,797 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:40,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:40,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-18 15:36:40,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:40,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896409899] [2020-08-18 15:36:40,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:40,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:41,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:41,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:41,119 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:41,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896409899] [2020-08-18 15:36:41,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:41,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 15:36:41,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473654877] [2020-08-18 15:36:41,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 15:36:41,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:41,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 15:36:41,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-18 15:36:41,121 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-18 15:36:41,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:41,996 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 15:36:41,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 15:36:41,997 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-18 15:36:41,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:41,997 INFO L225 Difference]: With dead ends: 66 [2020-08-18 15:36:41,997 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 15:36:41,998 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 [2020-08-18 15:36:41,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 15:36:42,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 15:36:42,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 15:36:42,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-18 15:36:42,007 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-18 15:36:42,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:42,008 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-18 15:36:42,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 15:36:42,008 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-18 15:36:42,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 15:36:42,008 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:42,008 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:42,010 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 15:36:42,012 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:42,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:42,013 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-18 15:36:42,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:42,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500961466] [2020-08-18 15:36:42,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:42,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:42,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:42,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:42,337 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:42,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500961466] [2020-08-18 15:36:42,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:42,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 15:36:42,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792325987] [2020-08-18 15:36:42,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 15:36:42,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:42,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 15:36:42,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-18 15:36:42,339 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-18 15:36:43,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:43,358 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-18 15:36:43,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 15:36:43,359 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-18 15:36:43,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:43,359 INFO L225 Difference]: With dead ends: 67 [2020-08-18 15:36:43,360 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 15:36:43,361 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 [2020-08-18 15:36:43,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 15:36:43,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 15:36:43,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 15:36:43,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-18 15:36:43,371 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-18 15:36:43,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:43,371 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-18 15:36:43,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 15:36:43,371 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-18 15:36:43,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 15:36:43,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:43,372 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:43,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 15:36:43,372 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:43,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:43,373 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-18 15:36:43,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:43,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [784075393] [2020-08-18 15:36:43,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:43,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:43,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:43,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:43,750 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:43,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [784075393] [2020-08-18 15:36:43,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:43,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 15:36:43,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832261183] [2020-08-18 15:36:43,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 15:36:43,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:43,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 15:36:43,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-18 15:36:43,752 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-18 15:36:44,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:44,823 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-18 15:36:44,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 15:36:44,824 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-18 15:36:44,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:44,825 INFO L225 Difference]: With dead ends: 68 [2020-08-18 15:36:44,825 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 15:36:44,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 15:36:44,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 15:36:44,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 15:36:44,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 15:36:44,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-18 15:36:44,833 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-18 15:36:44,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:44,834 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-18 15:36:44,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 15:36:44,834 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-18 15:36:44,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 15:36:44,834 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:44,835 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:44,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 15:36:44,835 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:44,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:44,835 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-18 15:36:44,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:44,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054125630] [2020-08-18 15:36:44,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:44,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:45,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:45,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:45,248 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 15:36:45,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054125630] [2020-08-18 15:36:45,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:45,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 15:36:45,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321254763] [2020-08-18 15:36:45,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 15:36:45,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:45,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 15:36:45,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-18 15:36:45,251 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-18 15:36:46,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:46,415 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-18 15:36:46,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 15:36:46,416 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-18 15:36:46,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:46,417 INFO L225 Difference]: With dead ends: 69 [2020-08-18 15:36:46,417 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 15:36:46,418 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 [2020-08-18 15:36:46,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 15:36:46,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 15:36:46,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 15:36:46,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-18 15:36:46,426 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-18 15:36:46,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:46,426 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-18 15:36:46,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 15:36:46,426 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-18 15:36:46,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 15:36:46,427 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:46,427 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:46,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 15:36:46,427 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:46,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:46,428 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-18 15:36:46,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:46,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415994958] [2020-08-18 15:36:46,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:46,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:46,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:46,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:46,484 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-18 15:36:46,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415994958] [2020-08-18 15:36:46,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:36:46,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 15:36:46,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385200470] [2020-08-18 15:36:46,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 15:36:46,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:46,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 15:36:46,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 15:36:46,485 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-18 15:36:46,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:46,514 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 15:36:46,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 15:36:46,514 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-18 15:36:46,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:46,515 INFO L225 Difference]: With dead ends: 66 [2020-08-18 15:36:46,515 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 15:36:46,516 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 [2020-08-18 15:36:46,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 15:36:46,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 15:36:46,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 15:36:46,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 15:36:46,517 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-18 15:36:46,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:46,517 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 15:36:46,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 15:36:46,517 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 15:36:46,517 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 15:36:46,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 15:36:46,519 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 15:36:46,711 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-08-18 15:36:46,715 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-18 15:36:46,715 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 15:36:46,715 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 15:36:46,716 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 15:36:46,716 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 15:36:46,716 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 15:36:46,716 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-18 15:36:46,716 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-18 15:36:46,716 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-18 15:36:46,716 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-18 15:36:46,717 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-18 15:36:46,717 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-18 15:36:46,717 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-18 15:36:46,717 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-18 15:36:46,718 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 15:36:46,718 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))) [2020-08-18 15:36:46,718 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-18 15:36:46,718 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-18 15:36:46,718 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 15:36:46,719 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-18 15:36:46,719 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-18 15:36:46,719 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-18 15:36:46,719 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-18 15:36:46,719 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-18 15:36:46,719 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-18 15:36:46,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 03:36:46 BoogieIcfgContainer [2020-08-18 15:36:46,738 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 15:36:46,740 INFO L168 Benchmark]: Toolchain (without parser) took 16300.46 ms. Allocated memory was 141.0 MB in the beginning and 358.1 MB in the end (delta: 217.1 MB). Free memory was 104.8 MB in the beginning and 319.7 MB in the end (delta: -214.9 MB). Peak memory consumption was 213.0 MB. Max. memory is 7.1 GB. [2020-08-18 15:36:46,740 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-18 15:36:46,741 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.03 ms. Allocated memory is still 141.0 MB. Free memory was 104.6 MB in the beginning and 94.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-08-18 15:36:46,742 INFO L168 Benchmark]: Boogie Preprocessor took 105.85 ms. Allocated memory was 141.0 MB in the beginning and 203.9 MB in the end (delta: 62.9 MB). Free memory was 94.8 MB in the beginning and 182.1 MB in the end (delta: -87.4 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-08-18 15:36:46,742 INFO L168 Benchmark]: RCFGBuilder took 253.81 ms. Allocated memory is still 203.9 MB. Free memory was 182.1 MB in the beginning and 170.1 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. [2020-08-18 15:36:46,743 INFO L168 Benchmark]: TraceAbstraction took 15692.93 ms. Allocated memory was 203.9 MB in the beginning and 358.1 MB in the end (delta: 154.1 MB). Free memory was 170.1 MB in the beginning and 319.7 MB in the end (delta: -149.6 MB). Peak memory consumption was 215.4 MB. Max. memory is 7.1 GB. [2020-08-18 15:36:46,745 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 243.03 ms. Allocated memory is still 141.0 MB. Free memory was 104.6 MB in the beginning and 94.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 105.85 ms. Allocated memory was 141.0 MB in the beginning and 203.9 MB in the end (delta: 62.9 MB). Free memory was 94.8 MB in the beginning and 182.1 MB in the end (delta: -87.4 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 253.81 ms. Allocated memory is still 203.9 MB. Free memory was 182.1 MB in the beginning and 170.1 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15692.93 ms. Allocated memory was 203.9 MB in the beginning and 358.1 MB in the end (delta: 154.1 MB). Free memory was 170.1 MB in the beginning and 319.7 MB in the end (delta: -149.6 MB). Peak memory consumption was 215.4 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: 15.4s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 11.8s 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, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s 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...