/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.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 21:55:16,303 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 21:55:16,307 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 21:55:16,335 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 21:55:16,336 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 21:55:16,337 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 21:55:16,339 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 21:55:16,341 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 21:55:16,343 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 21:55:16,344 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 21:55:16,345 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 21:55:16,346 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 21:55:16,347 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 21:55:16,348 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 21:55:16,349 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 21:55:16,350 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 21:55:16,351 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 21:55:16,353 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 21:55:16,354 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 21:55:16,357 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 21:55:16,358 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 21:55:16,360 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 21:55:16,361 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 21:55:16,362 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 21:55:16,365 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 21:55:16,374 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 21:55:16,375 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 21:55:16,376 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 21:55:16,377 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 21:55:16,390 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 21:55:16,390 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 21:55:16,392 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 21:55:16,392 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 21:55:16,393 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 21:55:16,393 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 21:55:16,393 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 21:55:16,393 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 21:55:16,394 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 21:55:16,394 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 21:55:16,394 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 21:55:16,394 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 21:55:16,394 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 21:55:16,395 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 21:55:16,395 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 21:55:16,395 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 21:55:16,395 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 21:55:16,395 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 21:55:16,396 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 21:55:16,396 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 21:55:16,396 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 21:55:16,396 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 21:55:16,397 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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: Use separate solver for trace checks -> true [2020-09-04 21:55:16,868 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 21:55:16,890 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 21:55:16,897 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 21:55:16,901 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 21:55:16,902 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 21:55:16,903 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-09-04 21:55:17,011 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0e4550b3b/f421d4c550554a91ac3ee35aa8fa8727/FLAG44e6ad9ec [2020-09-04 21:55:17,650 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 21:55:17,651 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-09-04 21:55:17,660 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0e4550b3b/f421d4c550554a91ac3ee35aa8fa8727/FLAG44e6ad9ec [2020-09-04 21:55:17,985 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0e4550b3b/f421d4c550554a91ac3ee35aa8fa8727 [2020-09-04 21:55:17,999 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 21:55:18,002 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 21:55:18,003 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 21:55:18,003 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 21:55:18,008 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 21:55:18,009 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 09:55:17" (1/1) ... [2020-09-04 21:55:18,013 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7565ecf1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18, skipping insertion in model container [2020-09-04 21:55:18,013 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 09:55:17" (1/1) ... [2020-09-04 21:55:18,023 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 21:55:18,050 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 21:55:18,267 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 21:55:18,273 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 21:55:18,296 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 21:55:18,316 INFO L208 MainTranslator]: Completed translation [2020-09-04 21:55:18,316 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18 WrapperNode [2020-09-04 21:55:18,317 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 21:55:18,321 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 21:55:18,321 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 21:55:18,321 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 21:55:18,336 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18" (1/1) ... [2020-09-04 21:55:18,336 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18" (1/1) ... [2020-09-04 21:55:18,439 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18" (1/1) ... [2020-09-04 21:55:18,439 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18" (1/1) ... [2020-09-04 21:55:18,444 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18" (1/1) ... [2020-09-04 21:55:18,447 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18" (1/1) ... [2020-09-04 21:55:18,449 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18" (1/1) ... [2020-09-04 21:55:18,451 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 21:55:18,451 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 21:55:18,451 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 21:55:18,452 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 21:55:18,455 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18" (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 [2020-09-04 21:55:18,530 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 21:55:18,530 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 21:55:18,530 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-09-04 21:55:18,530 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-09-04 21:55:18,530 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 21:55:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 21:55:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 21:55:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-09-04 21:55:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-09-04 21:55:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 21:55:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 21:55:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 21:55:18,765 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 21:55:18,766 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 21:55:18,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 09:55:18 BoogieIcfgContainer [2020-09-04 21:55:18,772 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 21:55:18,773 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 21:55:18,773 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 21:55:18,777 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 21:55:18,778 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 09:55:17" (1/3) ... [2020-09-04 21:55:18,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b16f902 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 09:55:18, skipping insertion in model container [2020-09-04 21:55:18,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 09:55:18" (2/3) ... [2020-09-04 21:55:18,780 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b16f902 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 09:55:18, skipping insertion in model container [2020-09-04 21:55:18,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 09:55:18" (3/3) ... [2020-09-04 21:55:18,783 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-09-04 21:55:18,795 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 21:55:18,805 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 21:55:18,829 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 21:55:18,881 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 21:55:18,881 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 21:55:18,881 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-04 21:55:18,881 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 21:55:18,882 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 21:55:18,882 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 21:55:18,882 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 21:55:18,882 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 21:55:18,905 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states. [2020-09-04 21:55:18,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 21:55:18,920 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 21:55:18,921 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 21:55:18,922 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 21:55:18,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 21:55:18,931 INFO L82 PathProgramCache]: Analyzing trace with hash -588914908, now seen corresponding path program 1 times [2020-09-04 21:55:18,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 21:55:18,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1825555018] [2020-09-04 21:55:18,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 21:55:19,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 21:55:19,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 21:55:19,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 21:55:19,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1825555018] [2020-09-04 21:55:19,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 21:55:19,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 21:55:19,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913034008] [2020-09-04 21:55:19,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 21:55:19,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 21:55:19,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 21:55:19,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 21:55:19,221 INFO L87 Difference]: Start difference. First operand 34 states. Second operand 5 states. [2020-09-04 21:55:19,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 21:55:19,331 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2020-09-04 21:55:19,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 21:55:19,334 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-09-04 21:55:19,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 21:55:19,348 INFO L225 Difference]: With dead ends: 46 [2020-09-04 21:55:19,349 INFO L226 Difference]: Without dead ends: 32 [2020-09-04 21:55:19,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 21:55:19,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-04 21:55:19,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-09-04 21:55:19,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-04 21:55:19,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-09-04 21:55:19,422 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 16 [2020-09-04 21:55:19,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 21:55:19,422 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-09-04 21:55:19,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 21:55:19,423 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-09-04 21:55:19,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-04 21:55:19,425 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 21:55:19,426 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 21:55:19,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 21:55:19,427 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 21:55:19,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 21:55:19,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1852809946, now seen corresponding path program 1 times [2020-09-04 21:55:19,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 21:55:19,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [532993491] [2020-09-04 21:55:19,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 21:55:19,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 21:55:19,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 21:55:19,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:19,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 21:55:19,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [532993491] [2020-09-04 21:55:19,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 21:55:19,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 21:55:19,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078673098] [2020-09-04 21:55:19,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 21:55:19,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 21:55:19,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 21:55:19,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-09-04 21:55:19,588 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 7 states. [2020-09-04 21:55:19,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 21:55:19,718 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-09-04 21:55:19,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 21:55:19,720 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-09-04 21:55:19,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 21:55:19,722 INFO L225 Difference]: With dead ends: 45 [2020-09-04 21:55:19,722 INFO L226 Difference]: Without dead ends: 39 [2020-09-04 21:55:19,723 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-09-04 21:55:19,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-04 21:55:19,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-09-04 21:55:19,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-04 21:55:19,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-09-04 21:55:19,739 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 24 [2020-09-04 21:55:19,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 21:55:19,739 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-09-04 21:55:19,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 21:55:19,740 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-09-04 21:55:19,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-04 21:55:19,741 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 21:55:19,742 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 21:55:19,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 21:55:19,742 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 21:55:19,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 21:55:19,743 INFO L82 PathProgramCache]: Analyzing trace with hash -238705980, now seen corresponding path program 1 times [2020-09-04 21:55:19,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 21:55:19,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [719134435] [2020-09-04 21:55:19,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 21:55:19,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 21:55:19,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 21:55:19,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:19,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:19,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:19,926 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 21:55:19,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [719134435] [2020-09-04 21:55:19,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 21:55:19,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-04 21:55:19,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301537339] [2020-09-04 21:55:19,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 21:55:19,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 21:55:19,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 21:55:19,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-04 21:55:19,929 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 8 states. [2020-09-04 21:55:20,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 21:55:20,055 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2020-09-04 21:55:20,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 21:55:20,056 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2020-09-04 21:55:20,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 21:55:20,058 INFO L225 Difference]: With dead ends: 55 [2020-09-04 21:55:20,058 INFO L226 Difference]: Without dead ends: 49 [2020-09-04 21:55:20,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-09-04 21:55:20,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-04 21:55:20,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2020-09-04 21:55:20,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 21:55:20,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-09-04 21:55:20,076 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 32 [2020-09-04 21:55:20,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 21:55:20,076 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-09-04 21:55:20,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 21:55:20,077 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-09-04 21:55:20,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-04 21:55:20,078 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 21:55:20,079 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 21:55:20,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 21:55:20,080 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 21:55:20,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 21:55:20,080 INFO L82 PathProgramCache]: Analyzing trace with hash -2006293766, now seen corresponding path program 1 times [2020-09-04 21:55:20,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 21:55:20,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093910820] [2020-09-04 21:55:20,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 21:55:20,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 21:55:20,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 21:55:20,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:20,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:20,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:20,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,367 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-04 21:55:20,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093910820] [2020-09-04 21:55:20,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 21:55:20,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-04 21:55:20,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405511246] [2020-09-04 21:55:20,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 21:55:20,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 21:55:20,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 21:55:20,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-09-04 21:55:20,371 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 9 states. [2020-09-04 21:55:20,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 21:55:20,484 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2020-09-04 21:55:20,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 21:55:20,485 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 40 [2020-09-04 21:55:20,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 21:55:20,487 INFO L225 Difference]: With dead ends: 65 [2020-09-04 21:55:20,487 INFO L226 Difference]: Without dead ends: 59 [2020-09-04 21:55:20,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-09-04 21:55:20,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-04 21:55:20,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2020-09-04 21:55:20,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-04 21:55:20,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2020-09-04 21:55:20,505 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 40 [2020-09-04 21:55:20,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 21:55:20,506 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2020-09-04 21:55:20,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 21:55:20,506 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2020-09-04 21:55:20,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-04 21:55:20,508 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 21:55:20,508 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 21:55:20,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 21:55:20,509 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 21:55:20,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 21:55:20,509 INFO L82 PathProgramCache]: Analyzing trace with hash 940355172, now seen corresponding path program 2 times [2020-09-04 21:55:20,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 21:55:20,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476701906] [2020-09-04 21:55:20,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 21:55:20,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 21:55:20,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 21:55:20,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:20,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:20,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:20,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 21:55:20,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 21:55:20,734 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-09-04 21:55:20,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476701906] [2020-09-04 21:55:20,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 21:55:20,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-04 21:55:20,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914526717] [2020-09-04 21:55:20,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 21:55:20,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 21:55:20,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 21:55:20,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-09-04 21:55:20,737 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 10 states. [2020-09-04 21:55:20,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 21:55:20,871 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2020-09-04 21:55:20,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-04 21:55:20,872 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 48 [2020-09-04 21:55:20,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 21:55:20,874 INFO L225 Difference]: With dead ends: 75 [2020-09-04 21:55:20,874 INFO L226 Difference]: Without dead ends: 69 [2020-09-04 21:55:20,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-09-04 21:55:20,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-09-04 21:55:20,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 52. [2020-09-04 21:55:20,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-09-04 21:55:20,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-09-04 21:55:20,890 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 48 [2020-09-04 21:55:20,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 21:55:20,891 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-09-04 21:55:20,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 21:55:20,891 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-09-04 21:55:20,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-09-04 21:55:20,893 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 21:55:20,893 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 21:55:20,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 21:55:20,894 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 21:55:20,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 21:55:20,894 INFO L82 PathProgramCache]: Analyzing trace with hash 826985242, now seen corresponding path program 2 times [2020-09-04 21:55:20,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 21:55:20,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301322791] [2020-09-04 21:55:20,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 21:55:20,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 21:55:20,909 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 21:55:20,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 21:55:20,922 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 21:55:20,950 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 21:55:20,950 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 21:55:20,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 21:55:20,994 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 09:55:20 BoogieIcfgContainer [2020-09-04 21:55:20,994 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 21:55:20,998 INFO L168 Benchmark]: Toolchain (without parser) took 2995.73 ms. Allocated memory was 144.7 MB in the beginning and 232.3 MB in the end (delta: 87.6 MB). Free memory was 101.9 MB in the beginning and 123.5 MB in the end (delta: -21.6 MB). Peak memory consumption was 65.9 MB. Max. memory is 7.1 GB. [2020-09-04 21:55:21,000 INFO L168 Benchmark]: CDTParser took 0.99 ms. Allocated memory is still 144.7 MB. Free memory was 120.3 MB in the beginning and 119.8 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB. [2020-09-04 21:55:21,001 INFO L168 Benchmark]: CACSL2BoogieTranslator took 317.42 ms. Allocated memory is still 144.7 MB. Free memory was 101.5 MB in the beginning and 92.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-09-04 21:55:21,002 INFO L168 Benchmark]: Boogie Preprocessor took 129.96 ms. Allocated memory was 144.7 MB in the beginning and 201.3 MB in the end (delta: 56.6 MB). Free memory was 92.3 MB in the beginning and 180.0 MB in the end (delta: -87.7 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-09-04 21:55:21,003 INFO L168 Benchmark]: RCFGBuilder took 320.42 ms. Allocated memory is still 201.3 MB. Free memory was 180.0 MB in the beginning and 166.9 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-09-04 21:55:21,004 INFO L168 Benchmark]: TraceAbstraction took 2221.59 ms. Allocated memory was 201.3 MB in the beginning and 232.3 MB in the end (delta: 30.9 MB). Free memory was 165.9 MB in the beginning and 123.5 MB in the end (delta: 42.4 MB). Peak memory consumption was 73.3 MB. Max. memory is 7.1 GB. [2020-09-04 21:55:21,008 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.99 ms. Allocated memory is still 144.7 MB. Free memory was 120.3 MB in the beginning and 119.8 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 317.42 ms. Allocated memory is still 144.7 MB. Free memory was 101.5 MB in the beginning and 92.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 129.96 ms. Allocated memory was 144.7 MB in the beginning and 201.3 MB in the end (delta: 56.6 MB). Free memory was 92.3 MB in the beginning and 180.0 MB in the end (delta: -87.7 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 320.42 ms. Allocated memory is still 201.3 MB. Free memory was 180.0 MB in the beginning and 166.9 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2221.59 ms. Allocated memory was 201.3 MB in the beginning and 232.3 MB in the end (delta: 30.9 MB). Free memory was 165.9 MB in the beginning and 123.5 MB in the end (delta: 42.4 MB). Peak memory consumption was 73.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 21]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L18] int input = 5; VAL [input=5] [L19] CALL, EXPR id(input) VAL [\old(x)=5] [L8] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L13] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L14] CALL, EXPR id(x-1) VAL [\old(x)=3] [L8] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L13] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L14] CALL, EXPR id(x-1) VAL [\old(x)=1] [L8] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L13] COND TRUE x==0 VAL [\old(x)=0, x=0] [L13] return 0; VAL [\old(x)=0, \result=0, x=0] [L9] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L9] return id2(x-1) + 1; VAL [\old(x)=1, \result=1, id2(x-1)=0, x=1] [L14] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L14] return id(x-1) + 1; VAL [\old(x)=2, \result=2, id(x-1)=1, x=2] [L9] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L9] return id2(x-1) + 1; VAL [\old(x)=3, \result=3, id2(x-1)=2, x=3] [L14] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L14] return id(x-1) + 1; VAL [\old(x)=4, \result=4, id(x-1)=3, x=4] [L9] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L9] return id2(x-1) + 1; VAL [\old(x)=5, \result=5, id2(x-1)=4, x=5] [L19] RET, EXPR id(input) VAL [id(input)=5, input=5] [L19] int result = id(input); VAL [id(input)=5, input=5, result=5] [L20] COND TRUE result == 5 VAL [input=5, result=5] [L21] __VERIFIER_error() VAL [input=5, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.0s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 132 SDtfs, 138 SDslu, 520 SDs, 0 SdLazy, 204 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=52occurred 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: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 38 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 216 NumberOfCodeBlocks, 216 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 155 ConstructedInterpolants, 0 QuantifiedInterpolants, 12455 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 2 PerfectInterpolantSequences, 17/40 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...