/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/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/list-simple/sll2n_append_equal.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 04:11:43,993 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 04:11:43,997 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 04:11:44,014 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 04:11:44,015 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 04:11:44,017 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 04:11:44,019 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 04:11:44,029 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 04:11:44,032 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 04:11:44,035 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 04:11:44,037 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 04:11:44,039 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 04:11:44,039 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 04:11:44,041 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 04:11:44,044 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 04:11:44,045 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 04:11:44,047 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 04:11:44,048 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 04:11:44,049 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 04:11:44,051 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 04:11:44,052 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 04:11:44,053 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 04:11:44,054 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 04:11:44,054 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 04:11:44,056 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 04:11:44,059 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-24 04:11:44,060 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-24 04:11:44,060 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-24 04:11:44,061 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-24 04:11:44,062 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-24 04:11:44,062 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-24 04:11:44,063 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-24 04:11:44,063 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-24 04:11:44,063 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 04:11:44,064 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 04:11:44,064 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 04:11:44,065 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2019-11-24 04:11:44,079 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 04:11:44,080 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 04:11:44,080 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 04:11:44,081 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 04:11:44,081 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 04:11:44,081 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 04:11:44,081 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 04:11:44,081 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 04:11:44,082 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 04:11:44,082 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 04:11:44,082 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 04:11:44,082 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 04:11:44,082 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 04:11:44,083 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 04:11:44,083 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 04:11:44,084 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 04:11:44,084 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 04:11:44,084 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 04:11:44,084 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 04:11:44,084 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 04:11:44,084 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 04:11:44,085 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 04:11:44,085 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 04:11:44,085 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 04:11:44,085 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 04:11:44,085 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 04:11:44,086 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 04:11:44,086 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 04:11:44,086 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 04:11:44,086 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 04:11:44,086 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 04:11:44,087 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 04:11:44,087 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 04:11:44,087 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 04:11:44,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 04:11:44,087 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 04:11:44,088 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 04:11:44,088 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 04:11:44,410 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 04:11:44,423 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 04:11:44,427 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 04:11:44,428 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 04:11:44,429 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 04:11:44,430 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-simple/sll2n_append_equal.i [2019-11-24 04:11:44,491 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d39682851/57aeb1201e43489b80e59b77043d88da/FLAG186301884 [2019-11-24 04:11:45,038 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 04:11:45,039 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-simple/sll2n_append_equal.i [2019-11-24 04:11:45,051 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d39682851/57aeb1201e43489b80e59b77043d88da/FLAG186301884 [2019-11-24 04:11:45,316 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d39682851/57aeb1201e43489b80e59b77043d88da [2019-11-24 04:11:45,324 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 04:11:45,325 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 04:11:45,326 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 04:11:45,327 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 04:11:45,330 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 04:11:45,331 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:45,335 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15624ecd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45, skipping insertion in model container [2019-11-24 04:11:45,335 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:45,344 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 04:11:45,400 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 04:11:45,848 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:11:45,863 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 04:11:45,906 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:11:45,973 INFO L208 MainTranslator]: Completed translation [2019-11-24 04:11:45,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45 WrapperNode [2019-11-24 04:11:45,974 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 04:11:45,975 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 04:11:45,975 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 04:11:45,975 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 04:11:45,984 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:46,014 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:46,039 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 04:11:46,039 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 04:11:46,039 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 04:11:46,039 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 04:11:46,049 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:46,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:46,054 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:46,054 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:46,063 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:46,068 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:46,071 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (1/1) ... [2019-11-24 04:11:46,075 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 04:11:46,075 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 04:11:46,076 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 04:11:46,076 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 04:11:46,077 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (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 [2019-11-24 04:11:46,141 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-24 04:11:46,141 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-24 04:11:46,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-24 04:11:46,142 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-24 04:11:46,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-11-24 04:11:46,142 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-11-24 04:11:46,142 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-24 04:11:46,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2019-11-24 04:11:46,143 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 04:11:46,143 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 04:11:46,708 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 04:11:46,709 INFO L284 CfgBuilder]: Removed 22 assume(true) statements. [2019-11-24 04:11:46,710 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:11:46 BoogieIcfgContainer [2019-11-24 04:11:46,711 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 04:11:46,712 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 04:11:46,712 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 04:11:46,715 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 04:11:46,716 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 04:11:45" (1/3) ... [2019-11-24 04:11:46,717 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d734af7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:11:46, skipping insertion in model container [2019-11-24 04:11:46,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:11:45" (2/3) ... [2019-11-24 04:11:46,717 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d734af7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:11:46, skipping insertion in model container [2019-11-24 04:11:46,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:11:46" (3/3) ... [2019-11-24 04:11:46,720 INFO L109 eAbstractionObserver]: Analyzing ICFG sll2n_append_equal.i [2019-11-24 04:11:46,730 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 04:11:46,738 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 04:11:46,750 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 04:11:46,775 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 04:11:46,775 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 04:11:46,775 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 04:11:46,775 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 04:11:46,776 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 04:11:46,776 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 04:11:46,776 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 04:11:46,776 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 04:11:46,789 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-11-24 04:11:46,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-11-24 04:11:46,796 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:11:46,797 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:11:46,797 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:11:46,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:11:46,804 INFO L82 PathProgramCache]: Analyzing trace with hash -599855854, now seen corresponding path program 1 times [2019-11-24 04:11:46,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:11:46,814 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651612812] [2019-11-24 04:11:46,814 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:11:46,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:11:46,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:11:46,974 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651612812] [2019-11-24 04:11:46,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:11:46,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 04:11:46,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636980021] [2019-11-24 04:11:46,983 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:11:46,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:11:46,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:11:46,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:11:47,000 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-11-24 04:11:47,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:11:47,049 INFO L93 Difference]: Finished difference Result 37 states and 55 transitions. [2019-11-24 04:11:47,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:11:47,052 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2019-11-24 04:11:47,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:11:47,063 INFO L225 Difference]: With dead ends: 37 [2019-11-24 04:11:47,063 INFO L226 Difference]: Without dead ends: 16 [2019-11-24 04:11:47,067 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:11:47,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-24 04:11:47,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-11-24 04:11:47,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-24 04:11:47,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2019-11-24 04:11:47,104 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 8 [2019-11-24 04:11:47,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:11:47,105 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2019-11-24 04:11:47,105 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:11:47,105 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2019-11-24 04:11:47,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-24 04:11:47,106 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:11:47,106 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:11:47,107 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:11:47,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:11:47,107 INFO L82 PathProgramCache]: Analyzing trace with hash -935312274, now seen corresponding path program 1 times [2019-11-24 04:11:47,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:11:47,108 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918224443] [2019-11-24 04:11:47,108 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:11:47,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:11:47,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:11:47,206 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918224443] [2019-11-24 04:11:47,206 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448191207] [2019-11-24 04:11:47,206 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:11:47,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:11:47,335 INFO L255 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:11:47,342 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:11:47,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:11:47,383 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:11:47,402 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:11:47,403 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [90708695] [2019-11-24 04:11:47,425 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2019-11-24 04:11:47,426 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:11:47,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:11:47,439 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:11:47,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:11:47,726 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:48,191 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:48,337 WARN L192 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2019-11-24 04:11:48,781 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:49,642 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:49,962 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:50,347 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:51,159 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:51,215 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:51,509 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:51,712 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:51,714 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:11:52,919 WARN L192 SmtUtils]: Spent 1.18 s on a formula simplification. DAG size of input: 138 DAG size of output: 107 [2019-11-24 04:11:53,530 WARN L192 SmtUtils]: Spent 567.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 96 [2019-11-24 04:11:54,072 WARN L192 SmtUtils]: Spent 511.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 118 [2019-11-24 04:11:54,819 WARN L192 SmtUtils]: Spent 705.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 142 [2019-11-24 04:11:54,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:11:54,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3, 3] total 8 [2019-11-24 04:11:54,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251133588] [2019-11-24 04:11:54,826 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 04:11:54,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:11:54,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 04:11:54,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2019-11-24 04:11:54,827 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand 6 states. [2019-11-24 04:11:55,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:11:55,057 INFO L93 Difference]: Finished difference Result 21 states and 26 transitions. [2019-11-24 04:11:55,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-24 04:11:55,058 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-11-24 04:11:55,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:11:55,059 INFO L225 Difference]: With dead ends: 21 [2019-11-24 04:11:55,060 INFO L226 Difference]: Without dead ends: 15 [2019-11-24 04:11:55,061 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2019-11-24 04:11:55,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-24 04:11:55,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-11-24 04:11:55,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-24 04:11:55,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2019-11-24 04:11:55,067 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 10 [2019-11-24 04:11:55,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:11:55,067 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2019-11-24 04:11:55,067 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 04:11:55,067 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2019-11-24 04:11:55,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-24 04:11:55,068 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:11:55,068 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:11:55,281 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:11:55,281 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:11:55,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:11:55,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1918406764, now seen corresponding path program 1 times [2019-11-24 04:11:55,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:11:55,283 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3214868] [2019-11-24 04:11:55,283 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:11:55,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:11:55,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:11:55,365 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3214868] [2019-11-24 04:11:55,365 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877045079] [2019-11-24 04:11:55,365 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:11:55,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:11:55,455 INFO L255 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:11:55,459 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:11:55,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:11:55,475 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:11:55,501 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:11:55,501 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [434555659] [2019-11-24 04:11:55,503 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-24 04:11:55,503 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:11:55,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:11:55,506 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:11:55,506 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:11:55,638 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:56,154 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:56,721 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:57,268 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:57,458 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:57,923 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:58,349 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:58,393 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:58,644 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:58,954 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:11:59,048 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:11:59,900 WARN L192 SmtUtils]: Spent 836.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 104 [2019-11-24 04:12:00,615 WARN L192 SmtUtils]: Spent 688.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 90 [2019-11-24 04:12:01,194 WARN L192 SmtUtils]: Spent 552.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 118 [2019-11-24 04:12:01,894 WARN L192 SmtUtils]: Spent 662.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 142 [2019-11-24 04:12:02,620 WARN L192 SmtUtils]: Spent 667.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 142 [2019-11-24 04:12:03,404 WARN L192 SmtUtils]: Spent 723.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 151 [2019-11-24 04:12:03,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:12:03,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2019-11-24 04:12:03,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261100722] [2019-11-24 04:12:03,407 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-24 04:12:03,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:12:03,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-24 04:12:03,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-11-24 04:12:03,408 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 8 states. [2019-11-24 04:12:03,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:12:03,605 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2019-11-24 04:12:03,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-24 04:12:03,606 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2019-11-24 04:12:03,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:12:03,607 INFO L225 Difference]: With dead ends: 24 [2019-11-24 04:12:03,607 INFO L226 Difference]: Without dead ends: 17 [2019-11-24 04:12:03,611 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-11-24 04:12:03,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-24 04:12:03,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-24 04:12:03,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-24 04:12:03,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2019-11-24 04:12:03,617 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 13 [2019-11-24 04:12:03,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:12:03,617 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2019-11-24 04:12:03,618 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-24 04:12:03,618 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2019-11-24 04:12:03,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-24 04:12:03,618 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:12:03,619 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:12:03,823 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:12:03,824 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:12:03,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:12:03,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1536202705, now seen corresponding path program 1 times [2019-11-24 04:12:03,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:12:03,825 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456317395] [2019-11-24 04:12:03,826 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:12:03,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:12:03,899 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:12:03,899 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456317395] [2019-11-24 04:12:03,899 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937225258] [2019-11-24 04:12:03,899 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:12:03,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:12:03,965 INFO L255 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:12:03,967 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:12:03,976 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:12:03,976 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:12:03,989 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:12:03,989 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1937429662] [2019-11-24 04:12:03,991 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-24 04:12:03,991 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:12:03,992 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:12:03,992 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:12:03,992 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:12:04,062 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:04,411 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:04,766 WARN L192 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 189 [2019-11-24 04:12:04,904 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:05,673 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:05,957 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:06,278 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:06,499 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:07,186 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:07,303 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:07,372 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:07,666 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:08,078 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:08,169 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:08,193 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:08,215 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:08,239 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:08,493 WARN L192 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2019-11-24 04:12:08,777 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 13 [2019-11-24 04:12:10,891 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 13 [2019-11-24 04:12:13,175 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 13 [2019-11-24 04:12:15,607 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:12:15,744 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:12:16,128 WARN L192 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 95 [2019-11-24 04:12:17,171 WARN L192 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 137 DAG size of output: 116 [2019-11-24 04:12:17,947 WARN L192 SmtUtils]: Spent 745.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 91 [2019-11-24 04:12:18,506 WARN L192 SmtUtils]: Spent 523.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 119 [2019-11-24 04:12:19,246 WARN L192 SmtUtils]: Spent 665.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 143 [2019-11-24 04:12:21,285 WARN L192 SmtUtils]: Spent 1.96 s on a formula simplification. DAG size of input: 228 DAG size of output: 150 [2019-11-24 04:12:23,409 WARN L192 SmtUtils]: Spent 2.01 s on a formula simplification. DAG size of input: 237 DAG size of output: 160 [2019-11-24 04:12:24,636 WARN L192 SmtUtils]: Spent 1.12 s on a formula simplification. DAG size of input: 235 DAG size of output: 148 [2019-11-24 04:12:24,827 WARN L192 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2019-11-24 04:12:25,081 WARN L192 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2019-11-24 04:12:25,084 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 04:12:25,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:12:25,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2019-11-24 04:12:25,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440526844] [2019-11-24 04:12:25,086 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 04:12:25,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:12:25,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 04:12:25,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2019-11-24 04:12:25,087 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 5 states. [2019-11-24 04:12:25,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:12:25,116 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2019-11-24 04:12:25,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-24 04:12:25,116 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2019-11-24 04:12:25,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:12:25,117 INFO L225 Difference]: With dead ends: 32 [2019-11-24 04:12:25,117 INFO L226 Difference]: Without dead ends: 19 [2019-11-24 04:12:25,118 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2019-11-24 04:12:25,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-24 04:12:25,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-24 04:12:25,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-24 04:12:25,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2019-11-24 04:12:25,124 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2019-11-24 04:12:25,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:12:25,125 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2019-11-24 04:12:25,125 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 04:12:25,125 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2019-11-24 04:12:25,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-24 04:12:25,125 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:12:25,126 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:12:25,329 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:12:25,330 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:12:25,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:12:25,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1081758035, now seen corresponding path program 2 times [2019-11-24 04:12:25,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:12:25,331 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32796667] [2019-11-24 04:12:25,331 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:12:25,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:12:25,650 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:12:25,650 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32796667] [2019-11-24 04:12:25,651 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252390477] [2019-11-24 04:12:25,651 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:12:25,724 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2019-11-24 04:12:25,724 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-24 04:12:25,725 INFO L255 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 33 conjunts are in the unsatisfiable core [2019-11-24 04:12:25,728 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:12:26,066 WARN L192 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 42 [2019-11-24 04:12:26,248 WARN L192 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 42 [2019-11-24 04:12:26,322 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-24 04:12:26,322 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:12:29,119 WARN L192 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2019-11-24 04:12:29,338 WARN L192 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 55 [2019-11-24 04:12:29,372 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-24 04:12:29,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-24 04:12:29,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [11, 9] total 25 [2019-11-24 04:12:29,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263646431] [2019-11-24 04:12:29,373 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-24 04:12:29,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:12:29,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-24 04:12:29,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=504, Unknown=1, NotChecked=0, Total=600 [2019-11-24 04:12:29,374 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 9 states. [2019-11-24 04:12:29,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:12:29,657 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2019-11-24 04:12:29,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-24 04:12:29,660 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2019-11-24 04:12:29,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:12:29,661 INFO L225 Difference]: With dead ends: 25 [2019-11-24 04:12:29,661 INFO L226 Difference]: Without dead ends: 22 [2019-11-24 04:12:29,665 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=147, Invalid=722, Unknown=1, NotChecked=0, Total=870 [2019-11-24 04:12:29,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-24 04:12:29,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2019-11-24 04:12:29,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-24 04:12:29,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2019-11-24 04:12:29,678 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 17 [2019-11-24 04:12:29,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:12:29,678 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2019-11-24 04:12:29,678 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-24 04:12:29,679 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2019-11-24 04:12:29,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-24 04:12:29,681 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:12:29,681 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:12:29,886 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:12:29,887 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:12:29,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:12:29,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1081714542, now seen corresponding path program 1 times [2019-11-24 04:12:29,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:12:29,888 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095347722] [2019-11-24 04:12:29,888 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:12:30,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:12:30,914 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 47 [2019-11-24 04:12:31,057 WARN L192 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 47 [2019-11-24 04:12:31,308 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:12:31,308 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095347722] [2019-11-24 04:12:31,308 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866976291] [2019-11-24 04:12:31,308 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:12:31,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:12:31,384 INFO L255 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 94 conjunts are in the unsatisfiable core [2019-11-24 04:12:31,387 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:12:32,802 WARN L192 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 63 [2019-11-24 04:12:33,062 WARN L192 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 64 [2019-11-24 04:12:33,416 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:12:33,417 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:12:48,673 WARN L192 SmtUtils]: Spent 917.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 120