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 -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-10 03:06:08,963 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-10 03:06:08,965 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-10 03:06:08,977 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-10 03:06:08,986 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-10 03:06:08,987 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-10 03:06:08,988 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-10 03:06:08,989 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-10 03:06:08,990 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-10 03:06:08,991 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-10 03:06:08,993 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-10 03:06:08,995 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-10 03:06:08,997 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-10 03:06:08,998 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-10 03:06:08,999 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-10 03:06:09,000 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-10 03:06:09,002 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-10 03:06:09,013 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-10 03:06:09,028 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-10 03:06:09,028 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-10 03:06:09,029 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-10 03:06:09,029 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-10 03:06:09,029 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-10 03:06:09,030 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-10 03:06:09,030 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-10 03:06:09,030 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-10 03:06:09,030 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-10 03:06:09,030 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-10 03:06:09,031 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-10 03:06:09,031 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-10 03:06:09,032 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-10 03:06:09,032 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-10 03:06:09,032 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-10 03:06:09,032 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-10 03:06:09,032 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-10 03:06:09,033 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-10 03:06:09,033 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-10 03:06:09,033 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-10 03:06:09,033 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-10 03:06:09,033 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-10 03:06:09,034 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-10 03:06:09,034 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-10 03:06:09,034 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-10 03:06:09,034 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-10 03:06:09,034 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-10 03:06:09,035 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-10 03:06:09,035 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-10 03:06:09,035 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-10 03:06:09,063 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-10 03:06:09,075 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-10 03:06:09,079 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-10 03:06:09,080 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-10 03:06:09,081 INFO L275 PluginConnector]: CDTParser initialized [2019-09-10 03:06:09,081 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2019-09-10 03:06:09,143 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3206938d7/f68a7158ad6e4ee782739b556c31fd2a/FLAG30f822bfd [2019-09-10 03:06:09,619 INFO L306 CDTParser]: Found 1 translation units. [2019-09-10 03:06:09,620 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2019-09-10 03:06:09,626 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3206938d7/f68a7158ad6e4ee782739b556c31fd2a/FLAG30f822bfd [2019-09-10 03:06:10,039 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3206938d7/f68a7158ad6e4ee782739b556c31fd2a [2019-09-10 03:06:10,047 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-10 03:06:10,049 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-10 03:06:10,050 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-10 03:06:10,050 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-10 03:06:10,055 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-10 03:06:10,056 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 03:06:10" (1/1) ... [2019-09-10 03:06:10,059 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7531453e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10, skipping insertion in model container [2019-09-10 03:06:10,059 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 03:06:10" (1/1) ... [2019-09-10 03:06:10,066 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-10 03:06:10,083 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-10 03:06:10,265 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 03:06:10,268 INFO L188 MainTranslator]: Completed pre-run [2019-09-10 03:06:10,282 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 03:06:10,294 INFO L192 MainTranslator]: Completed translation [2019-09-10 03:06:10,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10 WrapperNode [2019-09-10 03:06:10,295 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-10 03:06:10,296 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-10 03:06:10,296 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-10 03:06:10,296 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-10 03:06:10,400 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10" (1/1) ... [2019-09-10 03:06:10,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10" (1/1) ... [2019-09-10 03:06:10,410 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10" (1/1) ... [2019-09-10 03:06:10,410 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10" (1/1) ... [2019-09-10 03:06:10,413 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10" (1/1) ... [2019-09-10 03:06:10,415 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10" (1/1) ... [2019-09-10 03:06:10,416 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10" (1/1) ... [2019-09-10 03:06:10,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-10 03:06:10,418 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-10 03:06:10,418 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-10 03:06:10,418 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-10 03:06:10,419 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2019-09-10 03:06:10,465 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-10 03:06:10,465 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-10 03:06:10,465 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-09-10 03:06:10,466 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2019-09-10 03:06:10,466 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-10 03:06:10,466 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-10 03:06:10,466 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-10 03:06:10,466 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-09-10 03:06:10,466 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2019-09-10 03:06:10,467 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-10 03:06:10,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-10 03:06:10,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-10 03:06:10,657 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-10 03:06:10,658 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-09-10 03:06:10,660 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 03:06:10 BoogieIcfgContainer [2019-09-10 03:06:10,660 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-10 03:06:10,662 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-10 03:06:10,662 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-10 03:06:10,667 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-10 03:06:10,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.09 03:06:10" (1/3) ... [2019-09-10 03:06:10,677 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58098c0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 03:06:10, skipping insertion in model container [2019-09-10 03:06:10,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:06:10" (2/3) ... [2019-09-10 03:06:10,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58098c0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 03:06:10, skipping insertion in model container [2019-09-10 03:06:10,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 03:06:10" (3/3) ... [2019-09-10 03:06:10,681 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2019-09-10 03:06:10,711 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-10 03:06:10,726 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-10 03:06:10,756 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-10 03:06:10,782 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-10 03:06:10,783 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-10 03:06:10,783 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-10 03:06:10,783 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-10 03:06:10,783 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-10 03:06:10,783 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-10 03:06:10,783 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-10 03:06:10,783 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-10 03:06:10,796 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-09-10 03:06:10,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-10 03:06:10,805 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:06:10,806 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 03:06:10,807 INFO L418 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:06:10,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:10,812 INFO L82 PathProgramCache]: Analyzing trace with hash -550894517, now seen corresponding path program 1 times [2019-09-10 03:06:10,814 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:06:10,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:10,852 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:06:10,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:10,852 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:06:10,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:06:10,971 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 03:06:10,975 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 03:06:10,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-10 03:06:10,976 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 03:06:10,980 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-10 03:06:10,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-10 03:06:10,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-10 03:06:10,995 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2019-09-10 03:06:11,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 03:06:11,123 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2019-09-10 03:06:11,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-10 03:06:11,126 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-09-10 03:06:11,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 03:06:11,137 INFO L225 Difference]: With dead ends: 28 [2019-09-10 03:06:11,138 INFO L226 Difference]: Without dead ends: 24 [2019-09-10 03:06:11,142 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-10 03:06:11,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-09-10 03:06:11,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-09-10 03:06:11,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-09-10 03:06:11,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-09-10 03:06:11,203 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2019-09-10 03:06:11,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 03:06:11,203 INFO L475 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-09-10 03:06:11,203 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-10 03:06:11,204 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-09-10 03:06:11,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-10 03:06:11,207 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:06:11,208 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 03:06:11,209 INFO L418 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:06:11,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:11,211 INFO L82 PathProgramCache]: Analyzing trace with hash 40504409, now seen corresponding path program 1 times [2019-09-10 03:06:11,211 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:06:11,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:11,213 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:06:11,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:11,213 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:06:11,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:06:11,354 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 03:06:11,354 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 03:06:11,354 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-09-10 03:06:11,354 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 03:06:11,359 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-10 03:06:11,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-10 03:06:11,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-09-10 03:06:11,360 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2019-09-10 03:06:11,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 03:06:11,451 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2019-09-10 03:06:11,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-10 03:06:11,452 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2019-09-10 03:06:11,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 03:06:11,453 INFO L225 Difference]: With dead ends: 29 [2019-09-10 03:06:11,453 INFO L226 Difference]: Without dead ends: 29 [2019-09-10 03:06:11,454 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-09-10 03:06:11,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-09-10 03:06:11,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2019-09-10 03:06:11,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-09-10 03:06:11,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-09-10 03:06:11,461 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2019-09-10 03:06:11,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 03:06:11,461 INFO L475 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-09-10 03:06:11,462 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-10 03:06:11,462 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-09-10 03:06:11,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-09-10 03:06:11,463 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:06:11,463 INFO L399 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] [2019-09-10 03:06:11,464 INFO L418 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:06:11,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:11,464 INFO L82 PathProgramCache]: Analyzing trace with hash 1029702107, now seen corresponding path program 1 times [2019-09-10 03:06:11,464 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:06:11,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:11,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:06:11,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:11,466 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:06:11,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:06:11,562 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-10 03:06:11,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 03:06:11,563 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 03:06:11,564 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 26 with the following transitions: [2019-09-10 03:06:11,566 INFO L207 CegarAbsIntRunner]: [0], [1], [5], [7], [8], [12], [14], [17], [19], [25], [28], [29], [31], [32], [33], [34], [35], [36], [37], [39], [40], [41], [42] [2019-09-10 03:06:11,602 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 03:06:11,602 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 03:06:11,738 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-09-10 03:06:11,742 INFO L272 AbstractInterpreter]: Visited 22 different actions 88 times. Merged at 8 different actions 22 times. Widened at 2 different actions 4 times. Performed 120 root evaluator evaluations with a maximum evaluation depth of 3. Performed 120 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2019-09-10 03:06:11,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:11,746 INFO L403 sIntCurrentIteration]: Generating AbsInt predicates [2019-09-10 03:06:11,806 INFO L227 lantSequenceWeakener]: Weakened 15 states. On average, predicates are now at 58.89% of their original sizes. [2019-09-10 03:06:11,807 INFO L418 sIntCurrentIteration]: Unifying AI predicates [2019-09-10 03:06:12,009 INFO L420 sIntCurrentIteration]: We unified 24 AI predicates to 24 [2019-09-10 03:06:12,009 INFO L429 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-09-10 03:06:12,010 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-10 03:06:12,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [16] imperfect sequences [8] total 22 [2019-09-10 03:06:12,011 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 03:06:12,012 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-10 03:06:12,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-10 03:06:12,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2019-09-10 03:06:12,013 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 16 states. [2019-09-10 03:06:12,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 03:06:12,461 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2019-09-10 03:06:12,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-10 03:06:12,462 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 25 [2019-09-10 03:06:12,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 03:06:12,463 INFO L225 Difference]: With dead ends: 48 [2019-09-10 03:06:12,464 INFO L226 Difference]: Without dead ends: 48 [2019-09-10 03:06:12,464 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=301, Unknown=0, NotChecked=0, Total=342 [2019-09-10 03:06:12,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-09-10 03:06:12,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2019-09-10 03:06:12,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-09-10 03:06:12,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-09-10 03:06:12,472 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 25 [2019-09-10 03:06:12,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 03:06:12,472 INFO L475 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-09-10 03:06:12,472 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-10 03:06:12,473 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-09-10 03:06:12,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-09-10 03:06:12,474 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:06:12,474 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 03:06:12,475 INFO L418 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:06:12,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:12,475 INFO L82 PathProgramCache]: Analyzing trace with hash -559715991, now seen corresponding path program 1 times [2019-09-10 03:06:12,475 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:06:12,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:12,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:06:12,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:12,477 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:06:12,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:06:12,560 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-09-10 03:06:12,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 03:06:12,561 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 03:06:12,561 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2019-09-10 03:06:12,561 INFO L207 CegarAbsIntRunner]: [0], [1], [4], [5], [7], [8], [12], [14], [17], [19], [25], [29], [31], [32], [33], [34], [35], [36], [37], [39], [40], [41], [42] [2019-09-10 03:06:12,563 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 03:06:12,563 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 03:06:12,589 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-10 03:06:12,590 INFO L272 AbstractInterpreter]: Visited 23 different actions 82 times. Merged at 8 different actions 19 times. Widened at 2 different actions 4 times. Performed 110 root evaluator evaluations with a maximum evaluation depth of 3. Performed 110 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 2 fixpoints after 2 different actions. Largest state had 4 variables. [2019-09-10 03:06:12,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:12,591 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-10 03:06:12,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 03:06:12,592 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 03:06:12,613 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:06:12,614 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 03:06:12,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:06:12,658 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-10 03:06:12,668 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 03:06:12,734 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-09-10 03:06:12,735 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 03:06:13,140 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 03:06:13,243 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 03:06:13,313 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 03:06:13,358 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-10 03:06:13,364 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 03:06:13,364 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 14 [2019-09-10 03:06:13,365 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 03:06:13,367 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-10 03:06:13,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-10 03:06:13,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2019-09-10 03:06:13,368 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 9 states. [2019-09-10 03:06:13,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 03:06:13,510 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2019-09-10 03:06:13,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-10 03:06:13,510 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2019-09-10 03:06:13,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 03:06:13,512 INFO L225 Difference]: With dead ends: 63 [2019-09-10 03:06:13,512 INFO L226 Difference]: Without dead ends: 54 [2019-09-10 03:06:13,513 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 52 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2019-09-10 03:06:13,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-09-10 03:06:13,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 42. [2019-09-10 03:06:13,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-09-10 03:06:13,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2019-09-10 03:06:13,521 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 31 [2019-09-10 03:06:13,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 03:06:13,522 INFO L475 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2019-09-10 03:06:13,522 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-10 03:06:13,522 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2019-09-10 03:06:13,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-09-10 03:06:13,523 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:06:13,524 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 03:06:13,524 INFO L418 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:06:13,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:13,525 INFO L82 PathProgramCache]: Analyzing trace with hash 2003326827, now seen corresponding path program 2 times [2019-09-10 03:06:13,525 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:06:13,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:13,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:06:13,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:13,530 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:06:13,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:06:13,668 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-09-10 03:06:13,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 03:06:13,668 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 03:06:13,669 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 03:06:13,669 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 03:06:13,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 03:06:13,669 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-10 03:06:13,683 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 03:06:13,683 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 03:06:13,709 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-09-10 03:06:13,710 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 03:06:13,711 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 12 conjunts are in the unsatisfiable core [2019-09-10 03:06:13,714 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 03:06:13,906 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-09-10 03:06:13,906 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 03:06:14,592 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-09-10 03:06:14,596 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 03:06:14,596 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13] total 21 [2019-09-10 03:06:14,596 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 03:06:14,597 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-10 03:06:14,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-10 03:06:14,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=371, Unknown=0, NotChecked=0, Total=420 [2019-09-10 03:06:14,598 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 21 states. [2019-09-10 03:06:14,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 03:06:14,890 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2019-09-10 03:06:14,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-10 03:06:14,891 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2019-09-10 03:06:14,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 03:06:14,893 INFO L225 Difference]: With dead ends: 68 [2019-09-10 03:06:14,893 INFO L226 Difference]: Without dead ends: 59 [2019-09-10 03:06:14,894 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 56 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=758, Unknown=0, NotChecked=0, Total=870 [2019-09-10 03:06:14,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-09-10 03:06:14,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 45. [2019-09-10 03:06:14,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-09-10 03:06:14,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2019-09-10 03:06:14,901 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 37 [2019-09-10 03:06:14,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 03:06:14,901 INFO L475 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2019-09-10 03:06:14,901 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-10 03:06:14,901 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2019-09-10 03:06:14,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-09-10 03:06:14,903 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:06:14,903 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 03:06:14,903 INFO L418 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:06:14,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:14,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1197899385, now seen corresponding path program 2 times [2019-09-10 03:06:14,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:06:14,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:14,905 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 03:06:14,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:14,905 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:06:14,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-10 03:06:14,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-10 03:06:14,967 INFO L466 BasicCegarLoop]: Counterexample might be feasible [2019-09-10 03:06:14,998 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.09 03:06:14 BoogieIcfgContainer [2019-09-10 03:06:14,998 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-10 03:06:15,003 INFO L168 Benchmark]: Toolchain (without parser) took 4950.81 ms. Allocated memory was 133.2 MB in the beginning and 260.0 MB in the end (delta: 126.9 MB). Free memory was 88.8 MB in the beginning and 156.5 MB in the end (delta: -67.7 MB). Peak memory consumption was 59.2 MB. Max. memory is 7.1 GB. [2019-09-10 03:06:15,005 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 133.2 MB. Free memory was 107.7 MB in the beginning and 107.5 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-10 03:06:15,006 INFO L168 Benchmark]: CACSL2BoogieTranslator took 245.49 ms. Allocated memory is still 133.2 MB. Free memory was 88.6 MB in the beginning and 79.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2019-09-10 03:06:15,009 INFO L168 Benchmark]: Boogie Preprocessor took 121.54 ms. Allocated memory was 133.2 MB in the beginning and 200.3 MB in the end (delta: 67.1 MB). Free memory was 79.4 MB in the beginning and 177.2 MB in the end (delta: -97.7 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. [2019-09-10 03:06:15,010 INFO L168 Benchmark]: RCFGBuilder took 242.94 ms. Allocated memory is still 200.3 MB. Free memory was 177.2 MB in the beginning and 165.5 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. [2019-09-10 03:06:15,011 INFO L168 Benchmark]: TraceAbstraction took 4336.24 ms. Allocated memory was 200.3 MB in the beginning and 260.0 MB in the end (delta: 59.8 MB). Free memory was 164.9 MB in the beginning and 156.5 MB in the end (delta: 8.4 MB). Peak memory consumption was 68.1 MB. Max. memory is 7.1 GB. [2019-09-10 03:06:15,022 INFO L335 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 133.2 MB. Free memory was 107.7 MB in the beginning and 107.5 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 245.49 ms. Allocated memory is still 133.2 MB. Free memory was 88.6 MB in the beginning and 79.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 121.54 ms. Allocated memory was 133.2 MB in the beginning and 200.3 MB in the end (delta: 67.1 MB). Free memory was 79.4 MB in the beginning and 177.2 MB in the end (delta: -97.7 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 242.94 ms. Allocated memory is still 200.3 MB. Free memory was 177.2 MB in the beginning and 165.5 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4336.24 ms. Allocated memory was 200.3 MB in the beginning and 260.0 MB in the end (delta: 59.8 MB). Free memory was 164.9 MB in the beginning and 156.5 MB in the end (delta: 8.4 MB). Peak memory consumption was 68.1 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 [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; [L14] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L9] return id2(x-1) + 1; [L19] RET, EXPR id(input) VAL [id(input)=5, input=5] [L19] int result = id(input); [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, 26 locations, 1 error locations. UNSAFE Result, 4.2s OverallTime, 6 OverallIterations, 3 TraceHistogramMax, 1.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 97 SDtfs, 75 SDslu, 734 SDs, 0 SdLazy, 295 SolverSat, 21 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 213 GetRequests, 122 SyntacticMatches, 19 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 0.6805555555555557 AbsIntWeakeningRatio, 0.5833333333333334 AbsIntAvgWeakeningVarsNumRemoved, 0.9583333333333334 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 36 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 236 NumberOfCodeBlocks, 236 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 252 ConstructedInterpolants, 0 QuantifiedInterpolants, 17016 SizeOfPredicates, 6 NumberOfNonLiveVariables, 162 ConjunctsInSsa, 22 ConjunctsInUnsatCore, 9 InterpolantComputations, 2 PerfectInterpolantSequences, 44/94 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...