/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/standard_find_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:23:18,953 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2019-11-07 01:23:18,999 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:23:19,003 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:23:19,005 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:23:19,006 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:23:19,008 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:23:19,011 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:23:19,012 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:23:19,018 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:23:19,021 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:23:19,022 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:23:19,026 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:23:19,027 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:23:19,029 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:23:19,036 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:23:19,036 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:23:19,037 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:23:19,038 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 01:23:19,052 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:23:19,052 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:23:19,053 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:23:19,054 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:23:19,054 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:23:19,054 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:23:19,054 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:23:19,054 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:23:19,055 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:23:19,055 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:23:19,055 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:23:19,055 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:23:19,055 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:23:19,056 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:23:19,056 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:23:19,056 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:23:19,056 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:23:19,056 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:23:19,057 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:23:19,057 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:23:19,057 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:23:19,057 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:23:19,058 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:23:19,058 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:23:19,058 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:23:19,058 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:23:19,058 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:23:19,059 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:23:19,059 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-11-07 01:23:19,336 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:23:19,358 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:23:19,362 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:23:19,363 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:23:19,364 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:23:19,364 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-11-07 01:23:19,426 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3fbe03741/e349308f51604dd4a6d9c6092ac3abf2/FLAG1f30c4a86 [2019-11-07 01:23:19,900 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:23:19,902 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-11-07 01:23:19,908 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3fbe03741/e349308f51604dd4a6d9c6092ac3abf2/FLAG1f30c4a86 [2019-11-07 01:23:20,290 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3fbe03741/e349308f51604dd4a6d9c6092ac3abf2 [2019-11-07 01:23:20,303 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:23:20,321 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:23:20,323 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:23:20,324 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:23:20,334 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:23:20,335 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:23:20" (1/1) ... [2019-11-07 01:23:20,343 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30e97d21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20, skipping insertion in model container [2019-11-07 01:23:20,343 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:23:20" (1/1) ... [2019-11-07 01:23:20,362 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:23:20,410 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:23:20,612 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:23:20,616 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:23:20,638 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:23:20,658 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:23:20,659 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20 WrapperNode [2019-11-07 01:23:20,659 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:23:20,660 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:23:20,660 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:23:20,660 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:23:20,755 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20" (1/1) ... [2019-11-07 01:23:20,756 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20" (1/1) ... [2019-11-07 01:23:20,762 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20" (1/1) ... [2019-11-07 01:23:20,763 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20" (1/1) ... [2019-11-07 01:23:20,770 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20" (1/1) ... [2019-11-07 01:23:20,776 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20" (1/1) ... [2019-11-07 01:23:20,777 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20" (1/1) ... [2019-11-07 01:23:20,779 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:23:20,780 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:23:20,780 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:23:20,780 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:23:20,781 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20" (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 [2019-11-07 01:23:20,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:23:20,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:23:20,836 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:23:20,836 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:23:20,836 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:23:20,836 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:23:20,837 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:23:20,837 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:23:20,837 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:23:20,837 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:23:20,837 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:23:20,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:23:20,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:23:20,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:23:21,197 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:23:21,197 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 01:23:21,199 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:23:21 BoogieIcfgContainer [2019-11-07 01:23:21,199 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:23:21,200 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:23:21,200 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:23:21,203 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:23:21,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:23:20" (1/3) ... [2019-11-07 01:23:21,205 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9f02e4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:23:21, skipping insertion in model container [2019-11-07 01:23:21,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:20" (2/3) ... [2019-11-07 01:23:21,205 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9f02e4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:23:21, skipping insertion in model container [2019-11-07 01:23:21,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:23:21" (3/3) ... [2019-11-07 01:23:21,207 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_find_ground-1.i [2019-11-07 01:23:21,217 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:23:21,229 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:23:21,241 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:23:21,263 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:23:21,263 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:23:21,263 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:23:21,264 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:23:21,264 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:23:21,264 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:23:21,264 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:23:21,264 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:23:21,278 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-07 01:23:21,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 01:23:21,285 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:21,286 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:21,288 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:21,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:21,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1508760786, now seen corresponding path program 1 times [2019-11-07 01:23:21,300 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:21,301 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162627778] [2019-11-07 01:23:21,301 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:21,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:21,425 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:23:21,426 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162627778] [2019-11-07 01:23:21,427 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:23:21,427 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-07 01:23:21,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054554967] [2019-11-07 01:23:21,434 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-07 01:23:21,434 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:21,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-07 01:23:21,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 01:23:21,453 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2019-11-07 01:23:21,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:21,479 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2019-11-07 01:23:21,479 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-07 01:23:21,481 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2019-11-07 01:23:21,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:21,492 INFO L225 Difference]: With dead ends: 34 [2019-11-07 01:23:21,492 INFO L226 Difference]: Without dead ends: 18 [2019-11-07 01:23:21,497 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 01:23:21,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-07 01:23:21,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-11-07 01:23:21,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-07 01:23:21,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-11-07 01:23:21,567 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2019-11-07 01:23:21,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:21,568 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-11-07 01:23:21,569 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-07 01:23:21,570 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-11-07 01:23:21,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 01:23:21,572 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:21,572 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:21,573 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:21,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:21,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1117724220, now seen corresponding path program 1 times [2019-11-07 01:23:21,575 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:21,575 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772666719] [2019-11-07 01:23:21,575 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:21,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:21,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:23:21,688 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772666719] [2019-11-07 01:23:21,688 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:23:21,689 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:23:21,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835136057] [2019-11-07 01:23:21,691 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:23:21,691 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:21,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:23:21,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:23:21,692 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 3 states. [2019-11-07 01:23:21,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:21,706 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2019-11-07 01:23:21,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:23:21,707 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-11-07 01:23:21,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:21,709 INFO L225 Difference]: With dead ends: 31 [2019-11-07 01:23:21,709 INFO L226 Difference]: Without dead ends: 19 [2019-11-07 01:23:21,710 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:23:21,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-07 01:23:21,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-07 01:23:21,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-07 01:23:21,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-11-07 01:23:21,716 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2019-11-07 01:23:21,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:21,717 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-11-07 01:23:21,717 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:23:21,717 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-11-07 01:23:21,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 01:23:21,718 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:21,718 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:21,718 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:21,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:21,719 INFO L82 PathProgramCache]: Analyzing trace with hash -578316820, now seen corresponding path program 1 times [2019-11-07 01:23:21,719 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:21,722 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341008044] [2019-11-07 01:23:21,722 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:21,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:21,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:23:21,851 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341008044] [2019-11-07 01:23:21,852 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:23:21,852 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:23:21,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992482353] [2019-11-07 01:23:21,853 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:23:21,853 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:21,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:23:21,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:23:21,854 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2019-11-07 01:23:21,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:21,881 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2019-11-07 01:23:21,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:23:21,883 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-07 01:23:21,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:21,884 INFO L225 Difference]: With dead ends: 32 [2019-11-07 01:23:21,884 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:23:21,885 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:23:21,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:23:21,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:23:21,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:23:21,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-11-07 01:23:21,890 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2019-11-07 01:23:21,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:21,891 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-11-07 01:23:21,891 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:23:21,891 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-11-07 01:23:21,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 01:23:21,892 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:21,892 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:21,893 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:21,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:21,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1210330239, now seen corresponding path program 1 times [2019-11-07 01:23:21,893 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:21,894 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630325367] [2019-11-07 01:23:21,894 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:21,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:21,969 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:23:21,970 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630325367] [2019-11-07 01:23:21,970 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968212739] [2019-11-07 01:23:21,970 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 [2019-11-07 01:23:22,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:22,039 INFO L256 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:23:22,045 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:22,086 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:23:22,086 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:22,123 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:23:22,123 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1035754548] [2019-11-07 01:23:22,176 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:23:22,176 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:22,187 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:22,193 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:22,194 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:22,312 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:22,490 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2019-11-07 01:23:22,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:22,502 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:22,957 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:22,958 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 13] total 19 [2019-11-07 01:23:22,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094760735] [2019-11-07 01:23:22,960 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 01:23:22,960 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:22,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 01:23:22,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2019-11-07 01:23:22,961 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 19 states. [2019-11-07 01:23:23,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:23,640 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2019-11-07 01:23:23,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-07 01:23:23,641 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 17 [2019-11-07 01:23:23,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:23,644 INFO L225 Difference]: With dead ends: 41 [2019-11-07 01:23:23,647 INFO L226 Difference]: Without dead ends: 27 [2019-11-07 01:23:23,648 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=157, Invalid=835, Unknown=0, NotChecked=0, Total=992 [2019-11-07 01:23:23,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-07 01:23:23,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2019-11-07 01:23:23,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 01:23:23,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-07 01:23:23,673 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-11-07 01:23:23,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:23,674 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-07 01:23:23,674 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 01:23:23,674 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-07 01:23:23,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:23:23,677 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:23,677 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:23,883 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:23,884 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:23,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:23,884 INFO L82 PathProgramCache]: Analyzing trace with hash -884454193, now seen corresponding path program 2 times [2019-11-07 01:23:23,884 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:23,885 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953153722] [2019-11-07 01:23:23,885 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:23,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:24,080 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:23:24,081 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953153722] [2019-11-07 01:23:24,081 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1864290208] [2019-11-07 01:23:24,081 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 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 [2019-11-07 01:23:24,131 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:23:24,131 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:23:24,132 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-07 01:23:24,134 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:24,264 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:23:24,264 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:24,416 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:23:24,417 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1143690594] [2019-11-07 01:23:24,418 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:23:24,420 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:24,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:24,421 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:24,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:24,449 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:24,517 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2019-11-07 01:23:24,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:24,525 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:25,062 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:25,063 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 13] total 32 [2019-11-07 01:23:25,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798732142] [2019-11-07 01:23:25,064 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-07 01:23:25,064 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:25,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-07 01:23:25,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=896, Unknown=0, NotChecked=0, Total=992 [2019-11-07 01:23:25,066 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 32 states. [2019-11-07 01:23:25,614 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2019-11-07 01:23:26,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:26,458 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2019-11-07 01:23:26,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-07 01:23:26,459 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 20 [2019-11-07 01:23:26,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:26,460 INFO L225 Difference]: With dead ends: 44 [2019-11-07 01:23:26,460 INFO L226 Difference]: Without dead ends: 30 [2019-11-07 01:23:26,461 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 502 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=303, Invalid=2349, Unknown=0, NotChecked=0, Total=2652 [2019-11-07 01:23:26,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-07 01:23:26,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-11-07 01:23:26,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-07 01:23:26,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2019-11-07 01:23:26,469 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 20 [2019-11-07 01:23:26,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:26,470 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2019-11-07 01:23:26,470 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-07 01:23:26,470 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2019-11-07 01:23:26,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 01:23:26,471 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:26,472 INFO L410 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:26,685 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:26,685 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:26,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:26,686 INFO L82 PathProgramCache]: Analyzing trace with hash 647347453, now seen corresponding path program 1 times [2019-11-07 01:23:26,686 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:26,686 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144411670] [2019-11-07 01:23:26,687 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:26,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:26,753 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:23:26,754 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144411670] [2019-11-07 01:23:26,754 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859984461] [2019-11-07 01:23:26,754 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 [2019-11-07 01:23:26,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:26,802 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-07 01:23:26,805 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:26,814 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:23:26,814 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:26,880 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:23:26,880 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [316354513] [2019-11-07 01:23:26,883 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:23:26,883 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:26,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:26,884 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:26,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:26,908 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:27,067 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:23:27,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:27,073 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:27,429 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:27,429 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 15] total 29 [2019-11-07 01:23:27,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810012091] [2019-11-07 01:23:27,431 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-07 01:23:27,431 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:27,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-07 01:23:27,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=663, Unknown=0, NotChecked=0, Total=812 [2019-11-07 01:23:27,433 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 29 states. [2019-11-07 01:23:28,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:28,310 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2019-11-07 01:23:28,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-07 01:23:28,311 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 28 [2019-11-07 01:23:28,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:28,314 INFO L225 Difference]: With dead ends: 54 [2019-11-07 01:23:28,314 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 01:23:28,319 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 778 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=424, Invalid=2228, Unknown=0, NotChecked=0, Total=2652 [2019-11-07 01:23:28,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 01:23:28,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-07 01:23:28,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:23:28,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2019-11-07 01:23:28,337 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 28 [2019-11-07 01:23:28,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:28,337 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2019-11-07 01:23:28,337 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-07 01:23:28,337 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2019-11-07 01:23:28,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-07 01:23:28,340 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:28,340 INFO L410 BasicCegarLoop]: trace histogram [12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:28,543 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:28,544 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:28,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:28,545 INFO L82 PathProgramCache]: Analyzing trace with hash 827219629, now seen corresponding path program 2 times [2019-11-07 01:23:28,545 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:28,546 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427254457] [2019-11-07 01:23:28,546 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:28,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:28,712 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:23:28,713 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427254457] [2019-11-07 01:23:28,713 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246864225] [2019-11-07 01:23:28,713 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 [2019-11-07 01:23:28,772 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:23:28,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:23:28,773 INFO L256 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 01:23:28,775 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:28,828 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-11-07 01:23:28,828 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:28,871 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-11-07 01:23:28,872 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [826788175] [2019-11-07 01:23:28,873 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:23:28,873 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:28,874 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:28,874 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:28,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:28,899 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:29,018 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:23:29,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:29,029 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:29,478 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:29,478 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6, 15] total 35 [2019-11-07 01:23:29,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977239571] [2019-11-07 01:23:29,480 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-07 01:23:29,480 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:29,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-07 01:23:29,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1021, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 01:23:29,482 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 35 states. [2019-11-07 01:23:31,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:31,287 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2019-11-07 01:23:31,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-11-07 01:23:31,287 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 35 [2019-11-07 01:23:31,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:31,288 INFO L225 Difference]: With dead ends: 62 [2019-11-07 01:23:31,288 INFO L226 Difference]: Without dead ends: 39 [2019-11-07 01:23:31,291 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1158 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=629, Invalid=4063, Unknown=0, NotChecked=0, Total=4692 [2019-11-07 01:23:31,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-07 01:23:31,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-11-07 01:23:31,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-07 01:23:31,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2019-11-07 01:23:31,299 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 35 [2019-11-07 01:23:31,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:31,299 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2019-11-07 01:23:31,299 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-07 01:23:31,299 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2019-11-07 01:23:31,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-07 01:23:31,300 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:31,300 INFO L410 BasicCegarLoop]: trace histogram [13, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:31,504 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:31,504 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:31,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:31,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1326599222, now seen corresponding path program 3 times [2019-11-07 01:23:31,505 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:31,505 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318166127] [2019-11-07 01:23:31,505 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:31,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:31,770 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 2 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:23:31,770 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318166127] [2019-11-07 01:23:31,770 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659199819] [2019-11-07 01:23:31,771 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 [2019-11-07 01:23:31,859 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:23:31,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:23:31,861 INFO L256 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-07 01:23:31,871 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:31,891 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:23:31,894 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:32,250 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 2 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:23:32,251 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027560170] [2019-11-07 01:23:32,252 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:23:32,253 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:32,258 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:32,258 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:32,259 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:32,280 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:32,422 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:23:32,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:32,434 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:32,817 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:32,818 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 15] total 45 [2019-11-07 01:23:32,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536994837] [2019-11-07 01:23:32,819 INFO L442 AbstractCegarLoop]: Interpolant automaton has 45 states [2019-11-07 01:23:32,819 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:32,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2019-11-07 01:23:32,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=509, Invalid=1471, Unknown=0, NotChecked=0, Total=1980 [2019-11-07 01:23:32,821 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 45 states. [2019-11-07 01:23:34,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:34,396 INFO L93 Difference]: Finished difference Result 74 states and 94 transitions. [2019-11-07 01:23:34,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-11-07 01:23:34,397 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 38 [2019-11-07 01:23:34,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:34,398 INFO L225 Difference]: With dead ends: 74 [2019-11-07 01:23:34,398 INFO L226 Difference]: Without dead ends: 54 [2019-11-07 01:23:34,403 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1934 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1472, Invalid=5500, Unknown=0, NotChecked=0, Total=6972 [2019-11-07 01:23:34,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-07 01:23:34,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-11-07 01:23:34,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-11-07 01:23:34,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2019-11-07 01:23:34,420 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 38 [2019-11-07 01:23:34,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:34,422 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2019-11-07 01:23:34,423 INFO L463 AbstractCegarLoop]: Interpolant automaton has 45 states. [2019-11-07 01:23:34,423 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2019-11-07 01:23:34,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-07 01:23:34,427 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:34,427 INFO L410 BasicCegarLoop]: trace histogram [28, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:34,632 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:34,632 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:34,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:34,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1469456762, now seen corresponding path program 4 times [2019-11-07 01:23:34,633 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:34,633 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595683268] [2019-11-07 01:23:34,633 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:34,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:35,094 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 2 proven. 406 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:23:35,094 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595683268] [2019-11-07 01:23:35,094 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952032111] [2019-11-07 01:23:35,095 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 [2019-11-07 01:23:35,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:35,188 INFO L256 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-07 01:23:35,191 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:35,206 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:23:35,206 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:36,136 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 2 proven. 406 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:23:36,137 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1836451736] [2019-11-07 01:23:36,138 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:23:36,138 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:36,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:36,139 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:36,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:36,163 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:36,269 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:23:36,275 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:36,277 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:36,911 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:36,911 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 15] total 75 [2019-11-07 01:23:36,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927361491] [2019-11-07 01:23:36,912 INFO L442 AbstractCegarLoop]: Interpolant automaton has 75 states [2019-11-07 01:23:36,912 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:36,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2019-11-07 01:23:36,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1874, Invalid=3676, Unknown=0, NotChecked=0, Total=5550 [2019-11-07 01:23:36,914 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 75 states. [2019-11-07 01:23:40,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:40,599 INFO L93 Difference]: Finished difference Result 104 states and 139 transitions. [2019-11-07 01:23:40,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2019-11-07 01:23:40,600 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 53 [2019-11-07 01:23:40,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:40,601 INFO L225 Difference]: With dead ends: 104 [2019-11-07 01:23:40,601 INFO L226 Difference]: Without dead ends: 84 [2019-11-07 01:23:40,607 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4964 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5507, Invalid=15085, Unknown=0, NotChecked=0, Total=20592 [2019-11-07 01:23:40,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-07 01:23:40,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-11-07 01:23:40,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-07 01:23:40,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 87 transitions. [2019-11-07 01:23:40,619 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 87 transitions. Word has length 53 [2019-11-07 01:23:40,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:40,619 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 87 transitions. [2019-11-07 01:23:40,619 INFO L463 AbstractCegarLoop]: Interpolant automaton has 75 states. [2019-11-07 01:23:40,620 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 87 transitions. [2019-11-07 01:23:40,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-11-07 01:23:40,621 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:40,621 INFO L410 BasicCegarLoop]: trace histogram [58, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:40,824 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:40,825 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:40,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:40,826 INFO L82 PathProgramCache]: Analyzing trace with hash -912001158, now seen corresponding path program 5 times [2019-11-07 01:23:40,826 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:40,827 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720321965] [2019-11-07 01:23:40,827 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:40,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:42,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1721 backedges. 2 proven. 1711 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:23:42,232 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720321965] [2019-11-07 01:23:42,232 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306997475] [2019-11-07 01:23:42,232 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 [2019-11-07 01:23:42,316 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:23:42,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:23:42,317 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-07 01:23:42,321 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:42,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1721 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2019-11-07 01:23:42,698 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:43,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1721 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2019-11-07 01:23:43,077 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [843921329] [2019-11-07 01:23:43,078 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:23:43,079 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:43,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:43,079 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:43,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:43,105 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:43,206 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:23:43,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:43,211 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:44,032 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:44,033 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 11, 11, 15] total 92 [2019-11-07 01:23:44,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527050077] [2019-11-07 01:23:44,035 INFO L442 AbstractCegarLoop]: Interpolant automaton has 92 states [2019-11-07 01:23:44,035 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:44,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2019-11-07 01:23:44,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1931, Invalid=6441, Unknown=0, NotChecked=0, Total=8372 [2019-11-07 01:23:44,038 INFO L87 Difference]: Start difference. First operand 84 states and 87 transitions. Second operand 92 states. [2019-11-07 01:23:51,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:51,174 INFO L93 Difference]: Finished difference Result 111 states and 119 transitions. [2019-11-07 01:23:51,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2019-11-07 01:23:51,174 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 83 [2019-11-07 01:23:51,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:51,176 INFO L225 Difference]: With dead ends: 111 [2019-11-07 01:23:51,177 INFO L226 Difference]: Without dead ends: 91 [2019-11-07 01:23:51,182 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5952 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=6020, Invalid=23736, Unknown=0, NotChecked=0, Total=29756 [2019-11-07 01:23:51,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-11-07 01:23:51,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2019-11-07 01:23:51,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-11-07 01:23:51,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2019-11-07 01:23:51,194 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 83 [2019-11-07 01:23:51,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:51,195 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2019-11-07 01:23:51,195 INFO L463 AbstractCegarLoop]: Interpolant automaton has 92 states. [2019-11-07 01:23:51,195 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2019-11-07 01:23:51,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-11-07 01:23:51,196 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:51,197 INFO L410 BasicCegarLoop]: trace histogram [59, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:51,400 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:51,401 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:51,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:51,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1366373714, now seen corresponding path program 6 times [2019-11-07 01:23:51,402 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:51,402 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506723455] [2019-11-07 01:23:51,402 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:51,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:53,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1791 backedges. 4 proven. 1770 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-11-07 01:23:53,006 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506723455] [2019-11-07 01:23:53,006 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764734764] [2019-11-07 01:23:53,006 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:53,132 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:23:53,133 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:23:53,134 INFO L256 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-07 01:23:53,138 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:53,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1791 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 1774 trivial. 0 not checked. [2019-11-07 01:23:53,310 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:53,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1791 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 1774 trivial. 0 not checked. [2019-11-07 01:23:53,486 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [446513899] [2019-11-07 01:23:53,488 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:23:53,488 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:53,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:53,488 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:53,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:53,504 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:53,605 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:23:53,609 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:53,610 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:54,498 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:54,498 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 8, 8, 15] total 85 [2019-11-07 01:23:54,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178159283] [2019-11-07 01:23:54,500 INFO L442 AbstractCegarLoop]: Interpolant automaton has 85 states [2019-11-07 01:23:54,501 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:54,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2019-11-07 01:23:54,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1971, Invalid=5169, Unknown=0, NotChecked=0, Total=7140 [2019-11-07 01:23:54,503 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand 85 states. [2019-11-07 01:24:01,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:24:01,253 INFO L93 Difference]: Finished difference Result 122 states and 133 transitions. [2019-11-07 01:24:01,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-11-07 01:24:01,254 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 91 [2019-11-07 01:24:01,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:24:01,256 INFO L225 Difference]: With dead ends: 122 [2019-11-07 01:24:01,256 INFO L226 Difference]: Without dead ends: 91 [2019-11-07 01:24:01,259 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 249 SyntacticMatches, 3 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6096 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=6296, Invalid=22774, Unknown=0, NotChecked=0, Total=29070 [2019-11-07 01:24:01,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-11-07 01:24:01,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2019-11-07 01:24:01,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-11-07 01:24:01,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 95 transitions. [2019-11-07 01:24:01,271 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 95 transitions. Word has length 91 [2019-11-07 01:24:01,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:24:01,272 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 95 transitions. [2019-11-07 01:24:01,272 INFO L463 AbstractCegarLoop]: Interpolant automaton has 85 states. [2019-11-07 01:24:01,272 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 95 transitions. [2019-11-07 01:24:01,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2019-11-07 01:24:01,274 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:24:01,274 INFO L410 BasicCegarLoop]: trace histogram [60, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:24:01,479 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:24:01,479 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:24:01,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:24:01,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1394434187, now seen corresponding path program 7 times [2019-11-07 01:24:01,481 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:24:01,481 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546243395] [2019-11-07 01:24:01,481 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:24:01,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat