/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/dll2n_remove_all_reverse.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 04:09:45,275 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 04:09:45,278 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 04:09:45,296 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 04:09:45,296 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 04:09:45,298 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 04:09:45,301 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 04:09:45,310 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 04:09:45,314 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 04:09:45,317 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 04:09:45,319 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 04:09:45,321 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 04:09:45,321 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 04:09:45,323 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 04:09:45,326 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 04:09:45,327 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 04:09:45,328 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 04:09:45,330 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 04:09:45,331 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 04:09:45,336 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 04:09:45,340 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 04:09:45,344 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 04:09:45,345 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 04:09:45,346 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 04:09:45,348 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 04:09:45,360 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 04:09:45,361 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 04:09:45,362 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 04:09:45,363 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 04:09:45,396 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 04:09:45,400 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 04:09:45,401 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 04:09:45,401 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 04:09:45,401 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 04:09:45,401 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 04:09:45,402 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 04:09:45,402 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 04:09:45,402 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 04:09:45,402 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 04:09:45,402 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 04:09:45,402 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 04:09:45,404 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 04:09:45,405 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 04:09:45,405 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 04:09:45,406 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 04:09:45,406 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 04:09:45,406 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 04:09:45,407 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 04:09:45,407 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 04:09:45,407 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 04:09:45,407 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 04:09:45,407 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 04:09:45,408 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 04:09:45,408 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 04:09:45,408 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 04:09:45,408 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 04:09:45,408 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 04:09:45,408 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 04:09:45,412 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 04:09:45,413 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 04:09:45,413 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 04:09:45,413 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 04:09:45,413 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 04:09:45,414 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 04:09:45,414 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 04:09:45,414 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 04:09:45,414 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 04:09:45,664 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 04:09:45,682 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 04:09:45,686 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 04:09:45,688 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 04:09:45,688 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 04:09:45,689 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-simple/dll2n_remove_all_reverse.i [2019-11-24 04:09:45,769 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/249bec2fe/87beef7a4cfd427894cc2512b48b5dfd/FLAGa955b4f90 [2019-11-24 04:09:46,289 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 04:09:46,290 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-simple/dll2n_remove_all_reverse.i [2019-11-24 04:09:46,316 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/249bec2fe/87beef7a4cfd427894cc2512b48b5dfd/FLAGa955b4f90 [2019-11-24 04:09:46,583 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/249bec2fe/87beef7a4cfd427894cc2512b48b5dfd [2019-11-24 04:09:46,591 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 04:09:46,592 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 04:09:46,593 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 04:09:46,593 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 04:09:46,597 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 04:09:46,598 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:09:46" (1/1) ... [2019-11-24 04:09:46,600 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a0c3ef7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:46, skipping insertion in model container [2019-11-24 04:09:46,601 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:09:46" (1/1) ... [2019-11-24 04:09:46,608 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 04:09:46,656 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 04:09:47,119 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:09:47,128 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 04:09:47,193 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:09:47,245 INFO L208 MainTranslator]: Completed translation [2019-11-24 04:09:47,246 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47 WrapperNode [2019-11-24 04:09:47,246 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 04:09:47,247 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 04:09:47,247 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 04:09:47,247 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 04:09:47,256 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (1/1) ... [2019-11-24 04:09:47,284 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (1/1) ... [2019-11-24 04:09:47,306 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 04:09:47,306 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 04:09:47,306 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 04:09:47,307 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 04:09:47,314 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (1/1) ... [2019-11-24 04:09:47,314 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (1/1) ... [2019-11-24 04:09:47,318 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (1/1) ... [2019-11-24 04:09:47,318 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (1/1) ... [2019-11-24 04:09:47,326 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (1/1) ... [2019-11-24 04:09:47,331 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (1/1) ... [2019-11-24 04:09:47,333 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (1/1) ... [2019-11-24 04:09:47,339 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 04:09:47,340 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 04:09:47,340 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 04:09:47,340 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 04:09:47,341 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (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 04:09:47,407 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-24 04:09:47,408 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-24 04:09:47,408 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-24 04:09:47,408 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-11-24 04:09:47,408 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-11-24 04:09:47,408 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-24 04:09:47,409 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2019-11-24 04:09:47,409 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 04:09:47,409 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 04:09:47,966 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 04:09:47,967 INFO L284 CfgBuilder]: Removed 13 assume(true) statements. [2019-11-24 04:09:47,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:09:47 BoogieIcfgContainer [2019-11-24 04:09:47,968 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 04:09:47,969 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 04:09:47,970 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 04:09:47,973 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 04:09:47,973 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 04:09:46" (1/3) ... [2019-11-24 04:09:47,974 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3939c2f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:09:47, skipping insertion in model container [2019-11-24 04:09:47,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:09:47" (2/3) ... [2019-11-24 04:09:47,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3939c2f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:09:47, skipping insertion in model container [2019-11-24 04:09:47,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:09:47" (3/3) ... [2019-11-24 04:09:47,977 INFO L109 eAbstractionObserver]: Analyzing ICFG dll2n_remove_all_reverse.i [2019-11-24 04:09:47,988 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 04:09:47,996 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 04:09:48,008 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 04:09:48,035 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 04:09:48,035 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 04:09:48,035 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 04:09:48,036 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 04:09:48,036 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 04:09:48,036 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 04:09:48,037 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 04:09:48,037 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 04:09:48,053 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2019-11-24 04:09:48,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-11-24 04:09:48,060 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:09:48,061 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2019-11-24 04:09:48,062 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:09:48,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:09:48,068 INFO L82 PathProgramCache]: Analyzing trace with hash 104177495, now seen corresponding path program 1 times [2019-11-24 04:09:48,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:09:48,080 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157595519] [2019-11-24 04:09:48,080 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:09:48,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:09:48,261 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 04:09:48,262 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157595519] [2019-11-24 04:09:48,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:09:48,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 04:09:48,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442234200] [2019-11-24 04:09:48,270 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:09:48,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:09:48,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:09:48,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:09:48,290 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2019-11-24 04:09:48,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:09:48,356 INFO L93 Difference]: Finished difference Result 29 states and 41 transitions. [2019-11-24 04:09:48,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:09:48,358 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 5 [2019-11-24 04:09:48,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:09:48,368 INFO L225 Difference]: With dead ends: 29 [2019-11-24 04:09:48,369 INFO L226 Difference]: Without dead ends: 14 [2019-11-24 04:09:48,372 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 04:09:48,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-24 04:09:48,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2019-11-24 04:09:48,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-24 04:09:48,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2019-11-24 04:09:48,410 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 5 [2019-11-24 04:09:48,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:09:48,410 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2019-11-24 04:09:48,410 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:09:48,410 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2019-11-24 04:09:48,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2019-11-24 04:09:48,411 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:09:48,411 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:09:48,411 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:09:48,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:09:48,412 INFO L82 PathProgramCache]: Analyzing trace with hash -760985725, now seen corresponding path program 1 times [2019-11-24 04:09:48,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:09:48,413 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531839653] [2019-11-24 04:09:48,413 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:09:48,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:09:48,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:09:48,520 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531839653] [2019-11-24 04:09:48,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:09:48,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 04:09:48,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989781312] [2019-11-24 04:09:48,523 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-24 04:09:48,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:09:48,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-24 04:09:48,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-24 04:09:48,524 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand 4 states. [2019-11-24 04:09:48,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:09:48,558 INFO L93 Difference]: Finished difference Result 22 states and 27 transitions. [2019-11-24 04:09:48,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-24 04:09:48,559 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2019-11-24 04:09:48,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:09:48,560 INFO L225 Difference]: With dead ends: 22 [2019-11-24 04:09:48,560 INFO L226 Difference]: Without dead ends: 19 [2019-11-24 04:09:48,561 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-24 04:09:48,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-24 04:09:48,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2019-11-24 04:09:48,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-24 04:09:48,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2019-11-24 04:09:48,566 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2019-11-24 04:09:48,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:09:48,566 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2019-11-24 04:09:48,567 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-24 04:09:48,567 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2019-11-24 04:09:48,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-24 04:09:48,567 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:09:48,568 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:09:48,568 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:09:48,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:09:48,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1179542204, now seen corresponding path program 1 times [2019-11-24 04:09:48,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:09:48,569 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549121811] [2019-11-24 04:09:48,569 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:09:48,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:09:48,673 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:09:48,674 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549121811] [2019-11-24 04:09:48,674 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208627093] [2019-11-24 04:09:48,674 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 04:09:48,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:09:48,802 INFO L255 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:09:48,808 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:09:48,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:09:48,848 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:09:48,882 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:09:48,883 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [338933654] [2019-11-24 04:09:48,918 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-11-24 04:09:48,919 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:09:48,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:09:48,930 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:09:48,931 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:09:49,255 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:49,728 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:50,780 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:51,246 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:51,352 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:52,352 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:53,388 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:53,417 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:53,431 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:53,449 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:09:54,949 WARN L192 SmtUtils]: Spent 1.42 s on a formula simplification. DAG size of input: 132 DAG size of output: 101 [2019-11-24 04:09:55,536 WARN L192 SmtUtils]: Spent 544.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 94 [2019-11-24 04:09:56,178 WARN L192 SmtUtils]: Spent 577.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 105 [2019-11-24 04:09:56,962 WARN L192 SmtUtils]: Spent 708.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 130 [2019-11-24 04:09:56,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:09:56,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 3, 3] total 11 [2019-11-24 04:09:56,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413299697] [2019-11-24 04:09:56,965 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 04:09:56,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:09:56,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 04:09:56,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2019-11-24 04:09:56,967 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand 6 states. [2019-11-24 04:09:57,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:09:57,121 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2019-11-24 04:09:57,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-24 04:09:57,122 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-11-24 04:09:57,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:09:57,122 INFO L225 Difference]: With dead ends: 27 [2019-11-24 04:09:57,122 INFO L226 Difference]: Without dead ends: 18 [2019-11-24 04:09:57,123 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2019-11-24 04:09:57,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-24 04:09:57,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 15. [2019-11-24 04:09:57,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-24 04:09:57,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2019-11-24 04:09:57,133 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 10 [2019-11-24 04:09:57,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:09:57,134 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2019-11-24 04:09:57,134 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 04:09:57,134 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2019-11-24 04:09:57,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-24 04:09:57,135 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:09:57,135 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:09:57,336 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:09:57,336 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:09:57,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:09:57,338 INFO L82 PathProgramCache]: Analyzing trace with hash -1295230024, now seen corresponding path program 1 times [2019-11-24 04:09:57,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:09:57,339 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069159752] [2019-11-24 04:09:57,339 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:09:57,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:09:57,464 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:09:57,464 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069159752] [2019-11-24 04:09:57,465 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585941206] [2019-11-24 04:09:57,466 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 04:09:57,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:09:57,563 INFO L255 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:09:57,566 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:09:57,590 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:09:57,591 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:09:57,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:09:57,615 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1603453127] [2019-11-24 04:09:57,617 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-24 04:09:57,617 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:09:57,621 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:09:57,622 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:09:57,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:09:57,773 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:58,236 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:58,852 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:59,351 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:59,534 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:00,182 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:00,834 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:00,855 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:00,877 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:00,900 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:00,920 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:00,933 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:01,311 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:10:02,261 WARN L192 SmtUtils]: Spent 912.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 101 [2019-11-24 04:10:02,829 WARN L192 SmtUtils]: Spent 532.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 89 [2019-11-24 04:10:03,484 WARN L192 SmtUtils]: Spent 584.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 105 [2019-11-24 04:10:04,217 WARN L192 SmtUtils]: Spent 668.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 130 [2019-11-24 04:10:05,002 WARN L192 SmtUtils]: Spent 710.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 125 [2019-11-24 04:10:05,803 WARN L192 SmtUtils]: Spent 671.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 134 [2019-11-24 04:10:05,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:10:05,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 3, 3] total 13 [2019-11-24 04:10:05,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733250015] [2019-11-24 04:10:05,812 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-24 04:10:05,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:10:05,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-24 04:10:05,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2019-11-24 04:10:05,813 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 8 states. [2019-11-24 04:10:05,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:10:05,980 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2019-11-24 04:10:05,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-24 04:10:05,981 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2019-11-24 04:10:05,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:10:05,982 INFO L225 Difference]: With dead ends: 29 [2019-11-24 04:10:05,982 INFO L226 Difference]: Without dead ends: 20 [2019-11-24 04:10:05,982 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2019-11-24 04:10:05,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-24 04:10:05,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2019-11-24 04:10:05,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-24 04:10:05,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2019-11-24 04:10:05,987 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 13 [2019-11-24 04:10:05,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:10:05,987 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2019-11-24 04:10:05,987 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-24 04:10:05,988 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2019-11-24 04:10:05,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-24 04:10:05,988 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:10:05,988 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:10:06,189 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:10:06,189 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:10:06,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:10:06,190 INFO L82 PathProgramCache]: Analyzing trace with hash 331958675, now seen corresponding path program 1 times [2019-11-24 04:10:06,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:10:06,191 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565941570] [2019-11-24 04:10:06,191 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:10:06,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:10:06,288 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:10:06,289 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565941570] [2019-11-24 04:10:06,289 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364054212] [2019-11-24 04:10:06,289 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 04:10:06,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:10:06,358 INFO L255 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:10:06,359 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:10:06,382 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:10:06,384 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:10:06,405 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:10:06,405 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415340002] [2019-11-24 04:10:06,412 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-24 04:10:06,412 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:10:06,413 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:10:06,413 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:10:06,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:10:06,516 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:06,775 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:07,285 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:07,773 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:07,854 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:08,190 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:08,823 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:08,851 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:08,870 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:08,966 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:08,993 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:09,016 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:09,035 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:09,068 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:09,089 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:09,106 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:09,137 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:09,395 WARN L192 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2019-11-24 04:10:10,558 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:10:11,529 WARN L192 SmtUtils]: Spent 911.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 101 [2019-11-24 04:10:12,069 WARN L192 SmtUtils]: Spent 506.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 89 [2019-11-24 04:10:12,251 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 04:10:12,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:10:12,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 7 [2019-11-24 04:10:12,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295607394] [2019-11-24 04:10:12,252 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-24 04:10:12,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:10:12,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-24 04:10:12,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2019-11-24 04:10:12,253 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 8 states. [2019-11-24 04:10:12,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:10:12,349 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2019-11-24 04:10:12,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 04:10:12,349 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2019-11-24 04:10:12,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:10:12,350 INFO L225 Difference]: With dead ends: 33 [2019-11-24 04:10:12,350 INFO L226 Difference]: Without dead ends: 20 [2019-11-24 04:10:12,350 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2019-11-24 04:10:12,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-24 04:10:12,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-11-24 04:10:12,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-24 04:10:12,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2019-11-24 04:10:12,357 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2019-11-24 04:10:12,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:10:12,357 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2019-11-24 04:10:12,357 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-24 04:10:12,357 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2019-11-24 04:10:12,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-24 04:10:12,358 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:10:12,358 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:10:12,563 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:10:12,564 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:10:12,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:10:12,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1532275391, now seen corresponding path program 2 times [2019-11-24 04:10:12,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:10:12,565 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996764930] [2019-11-24 04:10:12,566 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:10:12,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:10:12,635 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-24 04:10:12,636 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996764930] [2019-11-24 04:10:12,636 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625186540] [2019-11-24 04:10:12,636 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 04:10:12,693 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-24 04:10:12,693 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-24 04:10:12,694 INFO L255 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-24 04:10:12,695 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:10:12,698 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-24 04:10:12,698 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:10:12,707 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-24 04:10:12,707 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [269434986] [2019-11-24 04:10:12,709 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-24 04:10:12,709 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:10:12,709 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:10:12,709 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:10:12,710 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:10:12,813 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:13,055 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:13,408 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:14,167 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:14,375 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:15,076 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:15,853 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:15,881 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:15,909 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:15,932 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:15,954 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:15,987 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,008 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,027 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,046 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,072 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,098 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,116 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,135 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,168 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,196 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,213 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,231 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:16,523 WARN L192 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2019-11-24 04:10:17,384 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:10:18,345 WARN L192 SmtUtils]: Spent 917.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 101 [2019-11-24 04:10:18,884 WARN L192 SmtUtils]: Spent 510.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 94 [2019-11-24 04:10:19,080 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 04:10:19,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:10:19,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2019-11-24 04:10:19,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660651532] [2019-11-24 04:10:19,081 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 04:10:19,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:10:19,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 04:10:19,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2019-11-24 04:10:19,082 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 5 states. [2019-11-24 04:10:19,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:10:19,133 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2019-11-24 04:10:19,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 04:10:19,133 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2019-11-24 04:10:19,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:10:19,134 INFO L225 Difference]: With dead ends: 27 [2019-11-24 04:10:19,134 INFO L226 Difference]: Without dead ends: 24 [2019-11-24 04:10:19,135 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2019-11-24 04:10:19,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-24 04:10:19,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-24 04:10:19,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-24 04:10:19,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2019-11-24 04:10:19,141 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 17 [2019-11-24 04:10:19,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:10:19,142 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2019-11-24 04:10:19,142 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 04:10:19,142 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2019-11-24 04:10:19,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-24 04:10:19,142 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:10:19,143 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:10:19,343 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:10:19,343 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:10:19,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:10:19,344 INFO L82 PathProgramCache]: Analyzing trace with hash -323328512, now seen corresponding path program 1 times [2019-11-24 04:10:19,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:10:19,344 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065187504] [2019-11-24 04:10:19,344 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:10:19,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:10:19,400 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 04:10:19,400 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065187504] [2019-11-24 04:10:19,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:10:19,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-24 04:10:19,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70703133] [2019-11-24 04:10:19,401 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 04:10:19,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:10:19,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 04:10:19,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-24 04:10:19,402 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 5 states. [2019-11-24 04:10:19,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:10:19,474 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2019-11-24 04:10:19,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 04:10:19,474 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2019-11-24 04:10:19,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:10:19,475 INFO L225 Difference]: With dead ends: 33 [2019-11-24 04:10:19,475 INFO L226 Difference]: Without dead ends: 24 [2019-11-24 04:10:19,476 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-24 04:10:19,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-24 04:10:19,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-24 04:10:19,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-24 04:10:19,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2019-11-24 04:10:19,486 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 20 [2019-11-24 04:10:19,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:10:19,487 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2019-11-24 04:10:19,487 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 04:10:19,487 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2019-11-24 04:10:19,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-24 04:10:19,488 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:10:19,488 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2019-11-24 04:10:19,488 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:10:19,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:10:19,489 INFO L82 PathProgramCache]: Analyzing trace with hash 1717330420, now seen corresponding path program 3 times [2019-11-24 04:10:19,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:10:19,490 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66082523] [2019-11-24 04:10:19,490 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:10:19,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:10:19,805 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:10:19,806 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66082523] [2019-11-24 04:10:19,806 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090498129] [2019-11-24 04:10:19,806 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 04:10:19,911 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-24 04:10:19,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-24 04:10:19,915 INFO L255 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 61 conjunts are in the unsatisfiable core [2019-11-24 04:10:19,919 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:10:20,456 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-24 04:10:20,457 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:10:20,684 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 04:10:20,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-24 04:10:20,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10, 9] total 24 [2019-11-24 04:10:20,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777787332] [2019-11-24 04:10:20,686 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-24 04:10:20,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:10:20,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-24 04:10:20,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=476, Unknown=0, NotChecked=0, Total=552 [2019-11-24 04:10:20,686 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 7 states. [2019-11-24 04:10:20,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:10:20,898 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2019-11-24 04:10:20,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-24 04:10:20,898 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-11-24 04:10:20,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:10:20,900 INFO L225 Difference]: With dead ends: 35 [2019-11-24 04:10:20,900 INFO L226 Difference]: Without dead ends: 26 [2019-11-24 04:10:20,901 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=101, Invalid=601, Unknown=0, NotChecked=0, Total=702 [2019-11-24 04:10:20,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-24 04:10:20,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-24 04:10:20,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-24 04:10:20,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2019-11-24 04:10:20,907 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 23 [2019-11-24 04:10:20,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:10:20,908 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2019-11-24 04:10:20,908 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-24 04:10:20,908 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2019-11-24 04:10:20,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-24 04:10:20,909 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:10:20,909 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2019-11-24 04:10:21,110 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:10:21,111 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:10:21,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:10:21,111 INFO L82 PathProgramCache]: Analyzing trace with hash 594587855, now seen corresponding path program 4 times [2019-11-24 04:10:21,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:10:21,112 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058105313] [2019-11-24 04:10:21,112 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:10:21,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:10:21,331 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:10:21,331 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058105313] [2019-11-24 04:10:21,331 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026827232] [2019-11-24 04:10:21,331 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:10:21,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:10:21,412 INFO L255 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 76 conjunts are in the unsatisfiable core [2019-11-24 04:10:21,415 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:10:22,235 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 13 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:10:22,236 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:10:22,946 WARN L192 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 27 [2019-11-24 04:10:23,201 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:10:23,202 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [390320385] [2019-11-24 04:10:23,205 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-24 04:10:23,205 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:10:23,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:10:23,206 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:10:23,206 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:10:23,284 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:23,535 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:23,714 WARN L192 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 203 [2019-11-24 04:10:24,808 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:25,274 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:25,434 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:25,876 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:26,694 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:26,718 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:26,741 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:26,870 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:26,894 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:26,917 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:26,938 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:26,963 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:26,986 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:27,012 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:27,041 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:27,058 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:27,081 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:27,100 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:27,119 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:27,140 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:27,153 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:10:27,401 WARN L192 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2019-11-24 04:10:27,579 WARN L192 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2019-11-24 04:10:28,447 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:10:29,526 WARN L192 SmtUtils]: Spent 900.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 101 [2019-11-24 04:10:30,143 WARN L192 SmtUtils]: Spent 501.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 85 [2019-11-24 04:10:30,460 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 04:10:30,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:10:30,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 12] total 34 [2019-11-24 04:10:30,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423465088] [2019-11-24 04:10:30,461 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-24 04:10:30,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:10:30,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-24 04:10:30,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1613, Unknown=0, NotChecked=0, Total=1806 [2019-11-24 04:10:30,463 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 35 states. [2019-11-24 04:10:31,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:10:31,939 INFO L93 Difference]: Finished difference Result 52 states and 58 transitions. [2019-11-24 04:10:31,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-24 04:10:31,940 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 25 [2019-11-24 04:10:31,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:10:31,940 INFO L225 Difference]: With dead ends: 52 [2019-11-24 04:10:31,941 INFO L226 Difference]: Without dead ends: 36 [2019-11-24 04:10:31,944 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 792 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=455, Invalid=2625, Unknown=0, NotChecked=0, Total=3080 [2019-11-24 04:10:31,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-24 04:10:31,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2019-11-24 04:10:31,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-24 04:10:31,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2019-11-24 04:10:31,952 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2019-11-24 04:10:31,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:10:31,953 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2019-11-24 04:10:31,953 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-24 04:10:31,953 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2019-11-24 04:10:31,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-24 04:10:31,954 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:10:31,954 INFO L410 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2019-11-24 04:10:32,169 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:10:32,169 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:10:32,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:10:32,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1896197610, now seen corresponding path program 5 times [2019-11-24 04:10:32,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:10:32,171 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348155168] [2019-11-24 04:10:32,171 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:10:32,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:10:32,579 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-24 04:10:32,579 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348155168] [2019-11-24 04:10:32,580 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215915046] [2019-11-24 04:10:32,580 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:10:33,060 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-24 04:10:33,060 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-24 04:10:33,066 INFO L255 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 80 conjunts are in the unsatisfiable core [2019-11-24 04:10:33,069 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:10:34,121 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 53 [2019-11-24 04:10:34,462 WARN L192 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 482 DAG size of output: 1 [2019-11-24 04:10:34,468 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-24 04:10:34,468 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:10:35,173 WARN L192 SmtUtils]: Spent 406.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2019-11-24 04:10:35,563 WARN L192 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2019-11-24 04:10:35,900 WARN L192 SmtUtils]: Spent 325.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2019-11-24 04:10:36,269 WARN L192 SmtUtils]: Spent 337.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2019-11-24 04:10:36,573 WARN L192 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 216 [2019-11-24 04:10:37,693 WARN L192 SmtUtils]: Spent 791.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 229 [2019-11-24 04:10:38,292 WARN L192 SmtUtils]: Spent 311.00 ms on a formula simplification that was a NOOP. DAG size: 230 [2019-11-24 04:10:41,375 WARN L227 Elim1Store]: Array PQE input equivalent to true [2019-11-24 04:10:41,400 WARN L227 Elim1Store]: Array PQE input equivalent to true