/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum04-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:50:39,862 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:50:39,865 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:50:39,889 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 22:50:39,926 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:50:39,927 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:50:39,927 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:50:39,928 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 22:50:39,950 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:50:39,951 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:50:39,952 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:50:39,952 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:50:39,952 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:50:39,953 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:50:39,953 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:50:39,953 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:50:39,953 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:50:39,953 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:50:39,953 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:50:39,954 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:50:39,954 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:50:39,954 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:50:39,954 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:50:39,954 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:50:39,955 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:50:39,955 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:50:39,955 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:50:39,955 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:50:39,955 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:50:39,956 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:50:39,956 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:50:39,956 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:50:39,956 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:50:39,956 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:50:39,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:50:39,957 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:50:39,957 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:50:39,957 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST; [2020-08-18 22:50:40,288 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:50:40,300 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:50:40,303 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:50:40,305 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:50:40,305 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:50:40,306 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-2.i [2020-08-18 22:50:40,376 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/abe46104d/480acba1b5f14071bb3ab45486919e67/FLAG4f12e3939 [2020-08-18 22:50:40,859 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:50:40,860 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/sum04-2.i [2020-08-18 22:50:40,865 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/abe46104d/480acba1b5f14071bb3ab45486919e67/FLAG4f12e3939 [2020-08-18 22:50:41,229 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/abe46104d/480acba1b5f14071bb3ab45486919e67 [2020-08-18 22:50:41,237 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:50:41,239 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:50:41,240 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:50:41,241 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:50:41,244 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:50:41,245 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:50:41" (1/1) ... [2020-08-18 22:50:41,249 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3699edcf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41, skipping insertion in model container [2020-08-18 22:50:41,249 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:50:41" (1/1) ... [2020-08-18 22:50:41,257 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:50:41,274 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:50:41,508 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:50:41,512 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:50:41,524 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:50:41,537 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:50:41,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41 WrapperNode [2020-08-18 22:50:41,538 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:50:41,539 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:50:41,539 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:50:41,539 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:50:41,550 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41" (1/1) ... [2020-08-18 22:50:41,550 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41" (1/1) ... [2020-08-18 22:50:41,555 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41" (1/1) ... [2020-08-18 22:50:41,555 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41" (1/1) ... [2020-08-18 22:50:41,633 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41" (1/1) ... [2020-08-18 22:50:41,641 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41" (1/1) ... [2020-08-18 22:50:41,642 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41" (1/1) ... [2020-08-18 22:50:41,644 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:50:41,644 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:50:41,644 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:50:41,644 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:50:41,645 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41" (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 22:50:41,716 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:50:41,716 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:50:41,716 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:50:41,717 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:50:41,717 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:50:41,717 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:50:41,717 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:50:41,717 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:50:41,717 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:50:41,881 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:50:41,881 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 22:50:41,885 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:50:41 BoogieIcfgContainer [2020-08-18 22:50:41,885 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:50:41,886 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:50:41,886 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:50:41,889 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:50:41,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:50:41" (1/3) ... [2020-08-18 22:50:41,890 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40488580 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:50:41, skipping insertion in model container [2020-08-18 22:50:41,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:41" (2/3) ... [2020-08-18 22:50:41,891 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40488580 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:50:41, skipping insertion in model container [2020-08-18 22:50:41,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:50:41" (3/3) ... [2020-08-18 22:50:41,894 INFO L109 eAbstractionObserver]: Analyzing ICFG sum04-2.i [2020-08-18 22:50:41,905 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:50:41,912 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:50:41,927 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:50:41,954 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:50:41,954 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:50:41,955 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:50:41,955 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:50:41,955 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:50:41,955 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:50:41,955 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:50:41,956 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:50:41,977 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-08-18 22:50:41,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 22:50:41,984 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:41,985 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:41,985 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:41,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:41,992 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2020-08-18 22:50:42,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089560633] [2020-08-18 22:50:42,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:42,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,116 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 22:50:42,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089560633] [2020-08-18 22:50:42,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:50:42,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 22:50:42,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023177813] [2020-08-18 22:50:42,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 22:50:42,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:42,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 22:50:42,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 22:50:42,145 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2020-08-18 22:50:42,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:42,166 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2020-08-18 22:50:42,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 22:50:42,168 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 22:50:42,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:42,175 INFO L225 Difference]: With dead ends: 29 [2020-08-18 22:50:42,175 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 22:50:42,178 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 22:50:42,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 22:50:42,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 22:50:42,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 22:50:42,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 22:50:42,216 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 22:50:42,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:42,217 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 22:50:42,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 22:50:42,217 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 22:50:42,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 22:50:42,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:42,218 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:42,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:50:42,219 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:42,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:42,220 INFO L82 PathProgramCache]: Analyzing trace with hash -15914692, now seen corresponding path program 1 times [2020-08-18 22:50:42,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443778918] [2020-08-18 22:50:42,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:42,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,279 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 22:50:42,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443778918] [2020-08-18 22:50:42,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:50:42,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 22:50:42,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958165193] [2020-08-18 22:50:42,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 22:50:42,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:42,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 22:50:42,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:50:42,286 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2020-08-18 22:50:42,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:42,314 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 22:50:42,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:50:42,315 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 22:50:42,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:42,317 INFO L225 Difference]: With dead ends: 19 [2020-08-18 22:50:42,317 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 22:50:42,318 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 22:50:42,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 22:50:42,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-08-18 22:50:42,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 22:50:42,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 22:50:42,327 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2020-08-18 22:50:42,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:42,328 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 22:50:42,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 22:50:42,329 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 22:50:42,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:50:42,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:42,343 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:42,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:50:42,344 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:42,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:42,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1244203718, now seen corresponding path program 1 times [2020-08-18 22:50:42,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567608597] [2020-08-18 22:50:42,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:42,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:42,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567608597] [2020-08-18 22:50:42,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:42,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 22:50:42,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682483783] [2020-08-18 22:50:42,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:50:42,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:42,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:50:42,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:50:42,444 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 4 states. [2020-08-18 22:50:42,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:42,477 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 22:50:42,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 22:50:42,478 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 22:50:42,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:42,479 INFO L225 Difference]: With dead ends: 21 [2020-08-18 22:50:42,480 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 22:50:42,480 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 22:50:42,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 22:50:42,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-18 22:50:42,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 22:50:42,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 22:50:42,486 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-18 22:50:42,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:42,487 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 22:50:42,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:50:42,487 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 22:50:42,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 22:50:42,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:42,488 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:42,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:50:42,489 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:42,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:42,489 INFO L82 PathProgramCache]: Analyzing trace with hash -513951304, now seen corresponding path program 2 times [2020-08-18 22:50:42,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113741106] [2020-08-18 22:50:42,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:42,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,545 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:42,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113741106] [2020-08-18 22:50:42,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:42,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 22:50:42,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372836294] [2020-08-18 22:50:42,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:50:42,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:42,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:50:42,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:50:42,548 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-18 22:50:42,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:42,584 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 22:50:42,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:50:42,585 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-18 22:50:42,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:42,586 INFO L225 Difference]: With dead ends: 23 [2020-08-18 22:50:42,586 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 22:50:42,587 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 22:50:42,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 22:50:42,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-18 22:50:42,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 22:50:42,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 22:50:42,593 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-18 22:50:42,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:42,594 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 22:50:42,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:50:42,594 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 22:50:42,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 22:50:42,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:42,596 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:42,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:50:42,596 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:42,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:42,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1178949302, now seen corresponding path program 3 times [2020-08-18 22:50:42,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849007949] [2020-08-18 22:50:42,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:42,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,666 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:42,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849007949] [2020-08-18 22:50:42,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:42,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:50:42,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141514482] [2020-08-18 22:50:42,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:50:42,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:42,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:50:42,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:50:42,669 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-18 22:50:42,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:42,701 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 22:50:42,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:50:42,702 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 22:50:42,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:42,703 INFO L225 Difference]: With dead ends: 25 [2020-08-18 22:50:42,704 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 22:50:42,704 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 22:50:42,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 22:50:42,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-18 22:50:42,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 22:50:42,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 22:50:42,710 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-18 22:50:42,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:42,711 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 22:50:42,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:50:42,711 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 22:50:42,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 22:50:42,712 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:42,712 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:42,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:50:42,713 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:42,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:42,713 INFO L82 PathProgramCache]: Analyzing trace with hash 263826484, now seen corresponding path program 4 times [2020-08-18 22:50:42,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [866197000] [2020-08-18 22:50:42,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:42,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,803 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:42,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [866197000] [2020-08-18 22:50:42,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:42,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:50:42,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151026699] [2020-08-18 22:50:42,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:50:42,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:42,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:50:42,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:50:42,807 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-18 22:50:42,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:42,841 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 22:50:42,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:50:42,842 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 22:50:42,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:42,843 INFO L225 Difference]: With dead ends: 27 [2020-08-18 22:50:42,843 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 22:50:42,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:50:42,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 22:50:42,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 22:50:42,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 22:50:42,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 22:50:42,849 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-18 22:50:42,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:42,850 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 22:50:42,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:50:42,850 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 22:50:42,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 22:50:42,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:42,851 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:42,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:50:42,852 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:42,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:42,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1299094066, now seen corresponding path program 5 times [2020-08-18 22:50:42,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670331134] [2020-08-18 22:50:42,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:42,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,992 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:42,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670331134] [2020-08-18 22:50:42,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:42,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:50:42,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840628148] [2020-08-18 22:50:42,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:50:42,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:42,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:50:42,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:50:42,995 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-18 22:50:43,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:43,086 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 22:50:43,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:50:43,087 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-18 22:50:43,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:43,088 INFO L225 Difference]: With dead ends: 29 [2020-08-18 22:50:43,088 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 22:50:43,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:50:43,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 22:50:43,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 22:50:43,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 22:50:43,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 22:50:43,101 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-18 22:50:43,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:43,102 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 22:50:43,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:50:43,102 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 22:50:43,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 22:50:43,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:43,103 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:43,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:50:43,104 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:43,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:43,104 INFO L82 PathProgramCache]: Analyzing trace with hash -241172304, now seen corresponding path program 6 times [2020-08-18 22:50:43,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:43,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487623762] [2020-08-18 22:50:43,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:43,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:43,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,208 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:43,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487623762] [2020-08-18 22:50:43,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:43,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:50:43,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905865369] [2020-08-18 22:50:43,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:50:43,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:43,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:50:43,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:50:43,211 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-18 22:50:43,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:43,250 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 22:50:43,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:50:43,251 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-18 22:50:43,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:43,252 INFO L225 Difference]: With dead ends: 31 [2020-08-18 22:50:43,252 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 22:50:43,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:50:43,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 22:50:43,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 22:50:43,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 22:50:43,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 22:50:43,259 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-18 22:50:43,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:43,259 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 22:50:43,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:50:43,260 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 22:50:43,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 22:50:43,260 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:43,261 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:43,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:50:43,261 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:43,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:43,262 INFO L82 PathProgramCache]: Analyzing trace with hash 1326563246, now seen corresponding path program 7 times [2020-08-18 22:50:43,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:43,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001798254] [2020-08-18 22:50:43,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:43,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:43,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,373 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:43,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001798254] [2020-08-18 22:50:43,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:43,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:50:43,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505666682] [2020-08-18 22:50:43,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:50:43,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:43,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:50:43,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:50:43,376 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-18 22:50:43,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:43,422 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 22:50:43,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:50:43,422 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-18 22:50:43,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:43,423 INFO L225 Difference]: With dead ends: 32 [2020-08-18 22:50:43,423 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 22:50:43,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:50:43,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 22:50:43,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 22:50:43,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 22:50:43,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 22:50:43,430 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-18 22:50:43,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:43,430 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 22:50:43,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:50:43,431 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 22:50:43,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 22:50:43,431 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:43,432 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:43,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:50:43,432 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:43,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:43,433 INFO L82 PathProgramCache]: Analyzing trace with hash 386905900, now seen corresponding path program 8 times [2020-08-18 22:50:43,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:43,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050894392] [2020-08-18 22:50:43,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:43,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:43,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,717 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:43,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050894392] [2020-08-18 22:50:43,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:43,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:50:43,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037886517] [2020-08-18 22:50:43,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:50:43,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:43,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:50:43,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:50:43,721 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 13 states. [2020-08-18 22:50:43,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:43,857 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 22:50:43,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:50:43,857 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 26 [2020-08-18 22:50:43,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:43,858 INFO L225 Difference]: With dead ends: 34 [2020-08-18 22:50:43,858 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 22:50:43,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:50:43,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 22:50:43,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 22:50:43,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 22:50:43,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 22:50:43,870 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-18 22:50:43,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:43,870 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 22:50:43,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:50:43,871 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 22:50:43,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 22:50:43,872 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:43,873 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:43,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:50:43,873 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:43,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:43,874 INFO L82 PathProgramCache]: Analyzing trace with hash -680671446, now seen corresponding path program 9 times [2020-08-18 22:50:43,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:43,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1666263691] [2020-08-18 22:50:43,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:43,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:43,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,993 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:43,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1666263691] [2020-08-18 22:50:43,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:50:43,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-08-18 22:50:43,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922331313] [2020-08-18 22:50:43,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:50:43,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:43,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:50:43,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:50:43,995 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 11 states. [2020-08-18 22:50:44,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:44,033 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 22:50:44,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:50:44,033 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2020-08-18 22:50:44,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:44,034 INFO L225 Difference]: With dead ends: 29 [2020-08-18 22:50:44,034 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 22:50:44,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:50:44,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 22:50:44,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 22:50:44,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 22:50:44,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 22:50:44,036 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2020-08-18 22:50:44,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:44,036 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 22:50:44,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:50:44,036 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 22:50:44,036 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 22:50:44,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:50:44,039 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 22:50:44,161 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-18 22:50:44,161 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 22:50:44,161 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 22:50:44,161 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 22:50:44,161 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 22:50:44,162 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 22:50:44,162 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 11 17) the Hoare annotation is: true [2020-08-18 22:50:44,162 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 11 17) no Hoare annotation was computed. [2020-08-18 22:50:44,162 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 11 17) no Hoare annotation was computed. [2020-08-18 22:50:44,162 INFO L268 CegarLoopResult]: For program point L13-2(lines 13 15) no Hoare annotation was computed. [2020-08-18 22:50:44,163 INFO L264 CegarLoopResult]: At program point L13-3(lines 13 15) the Hoare annotation is: (or (and (<= main_~i~0 4) (<= 6 main_~sn~0) (<= 4 main_~i~0) (<= main_~sn~0 6)) (and (<= 0 main_~sn~0) (<= 1 main_~i~0) (<= main_~sn~0 0) (<= main_~i~0 1)) (and (<= 7 main_~i~0) (<= main_~i~0 7) (<= 12 main_~sn~0) (<= main_~sn~0 12)) (and (<= main_~sn~0 4) (<= 3 main_~i~0) (<= main_~i~0 3) (<= 4 main_~sn~0)) (and (<= main_~i~0 6) (<= 10 main_~sn~0) (<= main_~sn~0 10) (<= 6 main_~i~0)) (and (<= 9 main_~i~0) (<= main_~sn~0 16) (< 15 main_~sn~0)) (and (<= 2 main_~i~0) (<= main_~sn~0 2) (<= 2 main_~sn~0) (<= main_~i~0 2)) (and (<= main_~sn~0 8) (<= 5 main_~i~0) (<= main_~i~0 5) (<= 8 main_~sn~0)) (and (<= main_~i~0 8) (<= 8 main_~i~0) (<= main_~sn~0 14) (<= 14 main_~sn~0))) [2020-08-18 22:50:44,163 INFO L264 CegarLoopResult]: At program point L13-4(lines 13 15) the Hoare annotation is: (and (<= main_~sn~0 16) (< 15 main_~sn~0)) [2020-08-18 22:50:44,163 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-08-18 22:50:44,163 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2020-08-18 22:50:44,164 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-18 22:50:44,164 INFO L268 CegarLoopResult]: For program point L4(lines 4 6) no Hoare annotation was computed. [2020-08-18 22:50:44,164 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2020-08-18 22:50:44,164 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2020-08-18 22:50:44,186 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 10:50:44 BoogieIcfgContainer [2020-08-18 22:50:44,186 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 22:50:44,189 INFO L168 Benchmark]: Toolchain (without parser) took 2949.10 ms. Allocated memory was 137.9 MB in the beginning and 229.1 MB in the end (delta: 91.2 MB). Free memory was 100.5 MB in the beginning and 97.3 MB in the end (delta: 3.2 MB). Peak memory consumption was 94.4 MB. Max. memory is 7.1 GB. [2020-08-18 22:50:44,190 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 137.9 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 22:50:44,191 INFO L168 Benchmark]: CACSL2BoogieTranslator took 297.96 ms. Allocated memory is still 137.9 MB. Free memory was 100.3 MB in the beginning and 90.9 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-18 22:50:44,192 INFO L168 Benchmark]: Boogie Preprocessor took 105.05 ms. Allocated memory was 137.9 MB in the beginning and 199.2 MB in the end (delta: 61.3 MB). Free memory was 90.9 MB in the beginning and 178.3 MB in the end (delta: -87.4 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-08-18 22:50:44,193 INFO L168 Benchmark]: RCFGBuilder took 240.95 ms. Allocated memory is still 199.2 MB. Free memory was 178.3 MB in the beginning and 167.2 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. [2020-08-18 22:50:44,194 INFO L168 Benchmark]: TraceAbstraction took 2299.94 ms. Allocated memory was 199.2 MB in the beginning and 229.1 MB in the end (delta: 29.9 MB). Free memory was 166.5 MB in the beginning and 97.3 MB in the end (delta: 69.2 MB). Peak memory consumption was 99.1 MB. Max. memory is 7.1 GB. [2020-08-18 22:50:44,199 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 137.9 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 297.96 ms. Allocated memory is still 137.9 MB. Free memory was 100.3 MB in the beginning and 90.9 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 105.05 ms. Allocated memory was 137.9 MB in the beginning and 199.2 MB in the end (delta: 61.3 MB). Free memory was 90.9 MB in the beginning and 178.3 MB in the end (delta: -87.4 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 240.95 ms. Allocated memory is still 199.2 MB. Free memory was 178.3 MB in the beginning and 167.2 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2299.94 ms. Allocated memory was 199.2 MB in the beginning and 229.1 MB in the end (delta: 29.9 MB). Free memory was 166.5 MB in the beginning and 97.3 MB in the end (delta: 69.2 MB). Peak memory consumption was 99.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: 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: 13]: Loop Invariant Derived loop invariant: ((((((((((i <= 4 && 6 <= sn) && 4 <= i) && sn <= 6) || (((0 <= sn && 1 <= i) && sn <= 0) && i <= 1)) || (((7 <= i && i <= 7) && 12 <= sn) && sn <= 12)) || (((sn <= 4 && 3 <= i) && i <= 3) && 4 <= sn)) || (((i <= 6 && 10 <= sn) && sn <= 10) && 6 <= i)) || ((9 <= i && sn <= 16) && 15 < sn)) || (((2 <= i && sn <= 2) && 2 <= sn) && i <= 2)) || (((sn <= 8 && 5 <= i) && i <= 5) && 8 <= sn)) || (((i <= 8 && 8 <= i) && sn <= 14) && 14 <= sn) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.0s, OverallIterations: 11, TraceHistogramMax: 9, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 120 SDtfs, 37 SDslu, 372 SDs, 0 SdLazy, 266 SolverSat, 11 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 101 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 11 MinimizatonAttempts, 7 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 17 PreInvPairs, 27 NumberOfFragments, 127 HoareAnnotationTreeSize, 17 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 200 NumberOfCodeBlocks, 200 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 9803 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 11 InterpolantComputations, 3 PerfectInterpolantSequences, 81/285 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...