/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 04:22:44,894 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 04:22:44,897 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 04:22:44,929 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-19 04:22:44,949 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 04:22:44,955 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 04:22:44,956 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 04:22:44,957 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 04:22:44,958 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 04:22:44,961 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 04:22:44,963 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 04:22:44,966 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 04:22:44,970 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 04:22:44,972 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 04:22:44,975 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 04:22:44,976 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 04:22:44,980 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 04:22:45,002 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 04:22:45,003 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 04:22:45,004 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 04:22:45,005 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 04:22:45,040 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 04:22:45,040 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 04:22:45,042 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 04:22:45,042 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 04:22:45,042 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 04:22:45,042 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 04:22:45,043 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 04:22:45,043 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 04:22:45,043 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 04:22:45,043 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 04:22:45,044 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 04:22:45,044 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 04:22:45,044 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 04:22:45,045 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 04:22:45,045 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 04:22:45,045 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 04:22:45,045 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 04:22:45,046 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 04:22:45,046 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 04:22:45,046 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 04:22:45,046 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 04:22:45,046 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 04:22:45,047 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 04:22:45,047 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 04:22:45,047 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 04:22:45,047 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 04:22:45,047 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 04:22:45,048 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 04:22:45,048 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 04:22:45,048 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; [2020-08-19 04:22:45,377 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 04:22:45,401 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 04:22:45,404 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 04:22:45,406 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 04:22:45,406 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 04:22:45,407 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-08-19 04:22:45,474 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/160e5cc17/26f59b7834854c1a99a2281a2d550448/FLAG21a246605 [2020-08-19 04:22:45,924 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 04:22:45,924 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-08-19 04:22:45,931 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/160e5cc17/26f59b7834854c1a99a2281a2d550448/FLAG21a246605 [2020-08-19 04:22:46,314 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/160e5cc17/26f59b7834854c1a99a2281a2d550448 [2020-08-19 04:22:46,324 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 04:22:46,326 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 04:22:46,327 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 04:22:46,328 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 04:22:46,331 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 04:22:46,332 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:22:46" (1/1) ... [2020-08-19 04:22:46,335 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43965ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46, skipping insertion in model container [2020-08-19 04:22:46,336 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:22:46" (1/1) ... [2020-08-19 04:22:46,344 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 04:22:46,362 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 04:22:46,593 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:22:46,597 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 04:22:46,609 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:22:46,624 INFO L208 MainTranslator]: Completed translation [2020-08-19 04:22:46,625 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46 WrapperNode [2020-08-19 04:22:46,625 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 04:22:46,626 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 04:22:46,626 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 04:22:46,626 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 04:22:46,637 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46" (1/1) ... [2020-08-19 04:22:46,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46" (1/1) ... [2020-08-19 04:22:46,729 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46" (1/1) ... [2020-08-19 04:22:46,730 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46" (1/1) ... [2020-08-19 04:22:46,733 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46" (1/1) ... [2020-08-19 04:22:46,735 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46" (1/1) ... [2020-08-19 04:22:46,736 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46" (1/1) ... [2020-08-19 04:22:46,738 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 04:22:46,738 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 04:22:46,738 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 04:22:46,738 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 04:22:46,739 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 04:22:46,808 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 04:22:46,808 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 04:22:46,809 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-19 04:22:46,809 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 04:22:46,809 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 04:22:46,809 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 04:22:46,810 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-19 04:22:46,810 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 04:22:46,810 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 04:22:46,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 04:22:46,973 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 04:22:46,974 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-19 04:22:46,978 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:22:46 BoogieIcfgContainer [2020-08-19 04:22:46,978 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 04:22:46,980 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 04:22:46,980 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 04:22:46,983 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 04:22:46,984 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 04:22:46" (1/3) ... [2020-08-19 04:22:46,985 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f70b49a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:22:46, skipping insertion in model container [2020-08-19 04:22:46,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:22:46" (2/3) ... [2020-08-19 04:22:46,985 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f70b49a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:22:46, skipping insertion in model container [2020-08-19 04:22:46,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:22:46" (3/3) ... [2020-08-19 04:22:46,987 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i5_o5-1.c [2020-08-19 04:22:46,999 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 04:22:47,005 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 04:22:47,018 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 04:22:47,041 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 04:22:47,041 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 04:22:47,041 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 04:22:47,041 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 04:22:47,042 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 04:22:47,042 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 04:22:47,042 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 04:22:47,042 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 04:22:47,057 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-19 04:22:47,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 04:22:47,063 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:22:47,064 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:22:47,064 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:22:47,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:22:47,069 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-08-19 04:22:47,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:22:47,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1172205940] [2020-08-19 04:22:47,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:22:47,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:22:47,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 04:22:47,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,363 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:22:47,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1172205940] [2020-08-19 04:22:47,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:22:47,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 04:22:47,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13952246] [2020-08-19 04:22:47,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 04:22:47,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:22:47,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 04:22:47,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:22:47,399 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-19 04:22:47,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:22:47,479 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-19 04:22:47,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 04:22:47,482 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 04:22:47,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:22:47,492 INFO L225 Difference]: With dead ends: 30 [2020-08-19 04:22:47,492 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 04:22:47,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:22:47,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 04:22:47,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 04:22:47,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 04:22:47,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-19 04:22:47,548 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-19 04:22:47,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:22:47,548 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-19 04:22:47,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 04:22:47,549 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-19 04:22:47,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 04:22:47,551 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:22:47,552 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:22:47,552 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 04:22:47,552 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:22:47,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:22:47,553 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-08-19 04:22:47,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:22:47,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603831116] [2020-08-19 04:22:47,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:22:47,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:22:47,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 04:22:47,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:47,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,705 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-19 04:22:47,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603831116] [2020-08-19 04:22:47,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:22:47,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 04:22:47,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641118426] [2020-08-19 04:22:47,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 04:22:47,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:22:47,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 04:22:47,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:22:47,710 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-19 04:22:47,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:22:47,776 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-19 04:22:47,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 04:22:47,778 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-19 04:22:47,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:22:47,779 INFO L225 Difference]: With dead ends: 25 [2020-08-19 04:22:47,779 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 04:22:47,781 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-19 04:22:47,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 04:22:47,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 04:22:47,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 04:22:47,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-19 04:22:47,789 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-19 04:22:47,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:22:47,790 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-19 04:22:47,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 04:22:47,790 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-19 04:22:47,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 04:22:47,793 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:22:47,793 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:22:47,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 04:22:47,794 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:22:47,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:22:47,794 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-08-19 04:22:47,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:22:47,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778039243] [2020-08-19 04:22:47,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:22:47,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:22:47,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 04:22:47,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:47,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:47,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:47,968 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-19 04:22:47,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778039243] [2020-08-19 04:22:47,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:22:47,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 04:22:47,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623348663] [2020-08-19 04:22:47,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 04:22:47,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:22:47,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 04:22:47,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-19 04:22:47,978 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-19 04:22:48,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:22:48,098 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-19 04:22:48,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 04:22:48,099 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-19 04:22:48,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:22:48,101 INFO L225 Difference]: With dead ends: 28 [2020-08-19 04:22:48,101 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 04:22:48,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-19 04:22:48,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 04:22:48,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 04:22:48,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 04:22:48,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-19 04:22:48,116 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-19 04:22:48,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:22:48,118 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-19 04:22:48,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 04:22:48,120 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-19 04:22:48,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 04:22:48,121 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:22:48,122 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:22:48,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 04:22:48,122 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:22:48,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:22:48,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-08-19 04:22:48,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:22:48,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699199956] [2020-08-19 04:22:48,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:22:48,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:22:48,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 04:22:48,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:48,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:48,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:48,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,349 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-19 04:22:48,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699199956] [2020-08-19 04:22:48,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:22:48,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 04:22:48,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460864869] [2020-08-19 04:22:48,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 04:22:48,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:22:48,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 04:22:48,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-19 04:22:48,353 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-19 04:22:48,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:22:48,467 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-19 04:22:48,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 04:22:48,470 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-19 04:22:48,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:22:48,472 INFO L225 Difference]: With dead ends: 31 [2020-08-19 04:22:48,472 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 04:22:48,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-19 04:22:48,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 04:22:48,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-19 04:22:48,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 04:22:48,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-19 04:22:48,489 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-19 04:22:48,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:22:48,492 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-19 04:22:48,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 04:22:48,493 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-19 04:22:48,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 04:22:48,495 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:22:48,495 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:22:48,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 04:22:48,495 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:22:48,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:22:48,496 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-08-19 04:22:48,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:22:48,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1465319789] [2020-08-19 04:22:48,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:22:48,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:22:48,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 04:22:48,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:48,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:48,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:48,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 04:22:48,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:22:48,734 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-19 04:22:48,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1465319789] [2020-08-19 04:22:48,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:22:48,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 04:22:48,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527198492] [2020-08-19 04:22:48,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 04:22:48,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:22:48,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 04:22:48,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-19 04:22:48,738 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-19 04:22:48,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:22:48,836 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-19 04:22:48,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 04:22:48,838 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-19 04:22:48,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:22:48,839 INFO L225 Difference]: With dead ends: 34 [2020-08-19 04:22:48,840 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 04:22:48,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-08-19 04:22:48,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 04:22:48,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-19 04:22:48,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 04:22:48,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-19 04:22:48,848 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-19 04:22:48,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:22:48,849 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-19 04:22:48,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 04:22:48,849 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-19 04:22:48,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 04:22:48,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:22:48,851 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:22:48,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 04:22:48,852 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:22:48,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:22:48,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-08-19 04:22:48,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:22:48,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964976428] [2020-08-19 04:22:48,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:22:48,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-19 04:22:48,874 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-19 04:22:48,874 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-19 04:22:48,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 04:22:48,902 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 04:22:48 BoogieIcfgContainer [2020-08-19 04:22:48,902 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 04:22:48,905 INFO L168 Benchmark]: Toolchain (without parser) took 2578.18 ms. Allocated memory was 145.8 MB in the beginning and 231.7 MB in the end (delta: 86.0 MB). Free memory was 101.8 MB in the beginning and 161.5 MB in the end (delta: -59.7 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. [2020-08-19 04:22:48,906 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 145.8 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-19 04:22:48,907 INFO L168 Benchmark]: CACSL2BoogieTranslator took 297.81 ms. Allocated memory is still 145.8 MB. Free memory was 101.4 MB in the beginning and 92.2 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-08-19 04:22:48,908 INFO L168 Benchmark]: Boogie Preprocessor took 112.32 ms. Allocated memory was 145.8 MB in the beginning and 200.3 MB in the end (delta: 54.5 MB). Free memory was 92.2 MB in the beginning and 179.3 MB in the end (delta: -87.0 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-08-19 04:22:48,909 INFO L168 Benchmark]: RCFGBuilder took 240.26 ms. Allocated memory is still 200.3 MB. Free memory was 178.6 MB in the beginning and 167.4 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. [2020-08-19 04:22:48,910 INFO L168 Benchmark]: TraceAbstraction took 1922.49 ms. Allocated memory was 200.3 MB in the beginning and 231.7 MB in the end (delta: 31.5 MB). Free memory was 166.8 MB in the beginning and 161.5 MB in the end (delta: 5.3 MB). Peak memory consumption was 36.8 MB. Max. memory is 7.1 GB. [2020-08-19 04:22:48,913 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 145.8 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 297.81 ms. Allocated memory is still 145.8 MB. Free memory was 101.4 MB in the beginning and 92.2 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 112.32 ms. Allocated memory was 145.8 MB in the beginning and 200.3 MB in the end (delta: 54.5 MB). Free memory was 92.2 MB in the beginning and 179.3 MB in the end (delta: -87.0 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 240.26 ms. Allocated memory is still 200.3 MB. Free memory was 178.6 MB in the beginning and 167.4 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1922.49 ms. Allocated memory was 200.3 MB in the beginning and 231.7 MB in the end (delta: 31.5 MB). Free memory was 166.8 MB in the beginning and 161.5 MB in the end (delta: 5.3 MB). Peak memory consumption was 36.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 5; [L11] CALL, EXPR id(input) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND TRUE x==0 [L5] return 0; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] int result = id(input); [L12] COND TRUE result == 5 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.8s, OverallIterations: 6, TraceHistogramMax: 6, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 69 SDtfs, 58 SDslu, 176 SDs, 0 SdLazy, 105 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=5, 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, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 168 NumberOfCodeBlocks, 168 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 120 ConstructedInterpolants, 0 QuantifiedInterpolants, 7200 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 50/100 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 incorrect! Received shutdown request...