/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-tiling/pr2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:32:22,911 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2019-11-07 01:32:22,936 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:32:22,937 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:32:22,938 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:32:22,939 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:32:22,940 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:32:22,941 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:32:22,943 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:32:22,945 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:32:22,946 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:32:22,948 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:32:22,949 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:32:22,950 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:32:22,952 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:32:22,959 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:32:22,960 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:32:22,961 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:32:22,962 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 01:32:22,976 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:32:22,976 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:32:22,978 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:32:22,978 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:32:22,978 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:32:22,978 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:32:22,979 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:32:22,979 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:32:22,979 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:32:22,979 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:32:22,979 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:32:22,980 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:32:22,980 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:32:22,980 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:32:22,980 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:32:22,980 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:32:22,981 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:32:22,981 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:32:22,981 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:32:22,981 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:32:22,981 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:32:22,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:32:22,982 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:32:22,982 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:32:22,982 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:32:22,982 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:32:22,983 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:32:22,983 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:32:22,983 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 01:32:23,311 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:32:23,332 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:32:23,337 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:32:23,339 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:32:23,339 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:32:23,340 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/pr2.c [2019-11-07 01:32:23,421 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a2a9241e/c7d122716bdc4b2a8ab7876077aadbc6/FLAG2888edbb6 [2019-11-07 01:32:23,845 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:32:23,846 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/pr2.c [2019-11-07 01:32:23,853 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a2a9241e/c7d122716bdc4b2a8ab7876077aadbc6/FLAG2888edbb6 [2019-11-07 01:32:24,260 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a2a9241e/c7d122716bdc4b2a8ab7876077aadbc6 [2019-11-07 01:32:24,272 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:32:24,274 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:32:24,278 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:32:24,278 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:32:24,282 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:32:24,283 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:32:24" (1/1) ... [2019-11-07 01:32:24,286 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56d4579d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24, skipping insertion in model container [2019-11-07 01:32:24,286 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:32:24" (1/1) ... [2019-11-07 01:32:24,295 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:32:24,317 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:32:24,525 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:32:24,532 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:32:24,559 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:32:24,693 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:32:24,693 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24 WrapperNode [2019-11-07 01:32:24,693 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:32:24,694 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:32:24,694 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:32:24,694 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:32:24,708 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24" (1/1) ... [2019-11-07 01:32:24,709 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24" (1/1) ... [2019-11-07 01:32:24,717 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24" (1/1) ... [2019-11-07 01:32:24,718 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24" (1/1) ... [2019-11-07 01:32:24,726 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24" (1/1) ... [2019-11-07 01:32:24,731 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24" (1/1) ... [2019-11-07 01:32:24,732 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24" (1/1) ... [2019-11-07 01:32:24,735 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:32:24,735 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:32:24,735 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:32:24,736 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:32:24,736 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24" (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 01:32:24,804 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:32:24,804 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:32:24,805 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:32:24,805 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:32:24,805 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:32:24,805 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 01:32:24,805 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:32:24,805 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:32:24,806 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:32:24,806 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:32:24,806 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:32:24,806 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:32:24,806 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:32:24,806 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:32:24,807 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:32:25,244 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:32:25,245 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-07 01:32:25,246 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:32:25 BoogieIcfgContainer [2019-11-07 01:32:25,246 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:32:25,247 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:32:25,247 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:32:25,251 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:32:25,251 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:32:24" (1/3) ... [2019-11-07 01:32:25,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@117803ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:32:25, skipping insertion in model container [2019-11-07 01:32:25,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:32:24" (2/3) ... [2019-11-07 01:32:25,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@117803ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:32:25, skipping insertion in model container [2019-11-07 01:32:25,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:32:25" (3/3) ... [2019-11-07 01:32:25,255 INFO L109 eAbstractionObserver]: Analyzing ICFG pr2.c [2019-11-07 01:32:25,264 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:32:25,271 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:32:25,281 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:32:25,303 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:32:25,303 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:32:25,303 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:32:25,304 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:32:25,304 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:32:25,304 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:32:25,304 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:32:25,304 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:32:25,318 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-07 01:32:25,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 01:32:25,323 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:32:25,323 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:32:25,325 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:32:25,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:32:25,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1554635187, now seen corresponding path program 1 times [2019-11-07 01:32:25,337 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:32:25,337 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113293509] [2019-11-07 01:32:25,338 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:32:25,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:32:25,546 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 01:32:25,547 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113293509] [2019-11-07 01:32:25,548 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:32:25,549 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:32:25,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733845031] [2019-11-07 01:32:25,555 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:32:25,556 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:32:25,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:32:25,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:32:25,574 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2019-11-07 01:32:25,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:32:25,661 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2019-11-07 01:32:25,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:32:25,663 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-11-07 01:32:25,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:32:25,672 INFO L225 Difference]: With dead ends: 42 [2019-11-07 01:32:25,672 INFO L226 Difference]: Without dead ends: 18 [2019-11-07 01:32:25,675 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 01:32:25,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-07 01:32:25,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-11-07 01:32:25,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-07 01:32:25,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-11-07 01:32:25,709 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2019-11-07 01:32:25,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:32:25,710 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-11-07 01:32:25,710 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:32:25,710 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-11-07 01:32:25,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 01:32:25,711 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:32:25,711 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:32:25,712 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:32:25,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:32:25,713 INFO L82 PathProgramCache]: Analyzing trace with hash 3214725, now seen corresponding path program 1 times [2019-11-07 01:32:25,713 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:32:25,713 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024303399] [2019-11-07 01:32:25,713 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:32:25,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:32:26,158 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:32:26,159 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024303399] [2019-11-07 01:32:26,159 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310143340] [2019-11-07 01:32:26,160 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 01:32:26,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:32:26,230 INFO L256 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-07 01:32:26,240 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:32:26,329 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,330 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,337 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,415 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:26,416 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 01:32:26,569 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 39 [2019-11-07 01:32:26,570 INFO L567 ElimStorePlain]: treesize reduction 3, result has 96.3 percent of original size [2019-11-07 01:32:26,581 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-07 01:32:26,598 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2019-11-07 01:32:26,599 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-07 01:32:26,655 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 01:32:26,665 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-07 01:32:26,666 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-07 01:32:26,674 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 26 [2019-11-07 01:32:26,675 INFO L496 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2019-11-07 01:32:26,729 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 01:32:26,738 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-07 01:32:26,740 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-07 01:32:26,746 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 29 [2019-11-07 01:32:26,746 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2019-11-07 01:32:26,790 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 01:32:26,792 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-2 vars, End of recursive call: and 3 xjuncts. [2019-11-07 01:32:26,795 INFO L221 ElimStorePlain]: Needed 5 recursive calls to eliminate 6 variables, input treesize:111, output treesize:80 [2019-11-07 01:32:26,926 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-07 01:32:26,936 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,939 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,945 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,949 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,954 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,960 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,966 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:26,968 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:32:27,010 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:32:27,022 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,023 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,024 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,028 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,078 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,080 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,084 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,117 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2019-11-07 01:32:27,123 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 01:32:27,132 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 01:32:27,138 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 49 [2019-11-07 01:32:27,140 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,141 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,142 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-07 01:32:27,156 INFO L567 ElimStorePlain]: treesize reduction 12, result has 53.8 percent of original size [2019-11-07 01:32:27,156 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-07 01:32:27,193 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 01:32:27,200 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2019-11-07 01:32:27,205 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 01:32:27,212 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 01:32:27,217 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 49 [2019-11-07 01:32:27,218 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,219 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,220 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2019-11-07 01:32:27,232 INFO L567 ElimStorePlain]: treesize reduction 12, result has 53.8 percent of original size [2019-11-07 01:32:27,232 INFO L496 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-07 01:32:27,290 INFO L567 ElimStorePlain]: treesize reduction 25, result has 80.2 percent of original size [2019-11-07 01:32:27,297 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 45 [2019-11-07 01:32:27,301 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 01:32:27,307 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 01:32:27,311 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 49 [2019-11-07 01:32:27,312 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,313 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:32:27,314 INFO L496 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2019-11-07 01:32:27,322 INFO L567 ElimStorePlain]: treesize reduction 13, result has 38.1 percent of original size [2019-11-07 01:32:27,322 INFO L496 ElimStorePlain]: Start of recursive call 6: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-07 01:32:27,332 INFO L567 ElimStorePlain]: treesize reduction 52, result has 13.3 percent of original size [2019-11-07 01:32:27,333 INFO L464 ElimStorePlain]: Eliminatee v_prenex_7 vanished before elimination [2019-11-07 01:32:27,333 INFO L496 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 4 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 01:32:27,333 INFO L221 ElimStorePlain]: Needed 7 recursive calls to eliminate 8 variables, input treesize:206, output treesize:8 [2019-11-07 01:32:27,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:32:27,361 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [701073970] [2019-11-07 01:32:27,398 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-07 01:32:27,398 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:32:27,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:32:27,419 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:32:27,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:32:27,558 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:32:27,795 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:27,808 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:27,829 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:27,911 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:28,013 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:28,116 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:28,173 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2019-11-07 01:32:28,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:32:28,195 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:32:29,015 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 48 [2019-11-07 01:32:29,129 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:32:29,129 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 12] total 30 [2019-11-07 01:32:29,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810012091] [2019-11-07 01:32:29,132 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-07 01:32:29,133 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:32:29,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-07 01:32:29,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=777, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:32:29,135 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 30 states. [2019-11-07 01:32:29,542 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 43 [2019-11-07 01:32:29,758 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 43 [2019-11-07 01:32:30,071 WARN L191 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 55 [2019-11-07 01:32:30,423 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 43 [2019-11-07 01:32:30,620 WARN L191 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 44 [2019-11-07 01:32:30,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:32:30,783 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2019-11-07 01:32:30,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:32:30,785 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 14 [2019-11-07 01:32:30,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:32:30,791 INFO L225 Difference]: With dead ends: 30 [2019-11-07 01:32:30,791 INFO L226 Difference]: Without dead ends: 28 [2019-11-07 01:32:30,795 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=191, Invalid=1369, Unknown=0, NotChecked=0, Total=1560 [2019-11-07 01:32:30,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-07 01:32:30,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-11-07 01:32:30,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-07 01:32:30,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-11-07 01:32:30,812 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 14 [2019-11-07 01:32:30,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:32:30,813 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-11-07 01:32:30,813 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-07 01:32:30,813 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-11-07 01:32:30,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 01:32:30,815 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:32:30,815 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:32:31,027 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:32:31,027 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:32:31,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:32:31,028 INFO L82 PathProgramCache]: Analyzing trace with hash 1342289861, now seen corresponding path program 1 times [2019-11-07 01:32:31,028 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:32:31,028 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026496249] [2019-11-07 01:32:31,029 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:32:31,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:32:31,377 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:32:31,378 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026496249] [2019-11-07 01:32:31,378 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089495676] [2019-11-07 01:32:31,378 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 [2019-11-07 01:32:31,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:32:31,459 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:32:31,463 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:32:31,700 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:32:31,701 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:32:31,793 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:32:31,793 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1806049508] [2019-11-07 01:32:31,795 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-11-07 01:32:31,796 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:32:31,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:32:31,797 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:32:31,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:32:31,835 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:32:31,942 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:32,024 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:32,037 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:32,047 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:32,132 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:32,205 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:32,654 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-11-07 01:32:32,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:32:32,660 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:32:33,235 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 28 [2019-11-07 01:32:33,460 WARN L191 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 53 [2019-11-07 01:32:33,705 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:32:33,706 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 7, 13] total 32 [2019-11-07 01:32:33,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477780251] [2019-11-07 01:32:33,707 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-07 01:32:33,708 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:32:33,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-07 01:32:33,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=860, Unknown=0, NotChecked=0, Total=992 [2019-11-07 01:32:33,709 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 32 states. [2019-11-07 01:32:33,956 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2019-11-07 01:32:34,516 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 56 [2019-11-07 01:32:35,533 WARN L191 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 51 [2019-11-07 01:32:35,698 WARN L191 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 50 [2019-11-07 01:32:36,051 WARN L191 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 48 [2019-11-07 01:32:36,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:32:36,167 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2019-11-07 01:32:36,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-07 01:32:36,168 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 28 [2019-11-07 01:32:36,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:32:36,170 INFO L225 Difference]: With dead ends: 49 [2019-11-07 01:32:36,170 INFO L226 Difference]: Without dead ends: 29 [2019-11-07 01:32:36,178 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 800 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=376, Invalid=2380, Unknown=0, NotChecked=0, Total=2756 [2019-11-07 01:32:36,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-07 01:32:36,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-11-07 01:32:36,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-07 01:32:36,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-11-07 01:32:36,189 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 28 [2019-11-07 01:32:36,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:32:36,189 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-11-07 01:32:36,190 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-07 01:32:36,192 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-11-07 01:32:36,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-07 01:32:36,193 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:32:36,193 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:32:36,398 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:32:36,399 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:32:36,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:32:36,399 INFO L82 PathProgramCache]: Analyzing trace with hash 1527019917, now seen corresponding path program 2 times [2019-11-07 01:32:36,399 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:32:36,400 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921031596] [2019-11-07 01:32:36,400 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:32:36,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:32:36,698 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:32:36,698 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921031596] [2019-11-07 01:32:36,698 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171619781] [2019-11-07 01:32:36,699 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 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 01:32:36,779 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:32:36,779 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:32:36,781 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-07 01:32:36,788 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:32:37,611 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:32:37,611 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:32:37,898 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:32:37,899 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1012388411] [2019-11-07 01:32:37,900 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-11-07 01:32:37,901 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:32:37,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:32:37,901 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:32:37,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:32:37,924 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:32:38,034 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:38,132 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:38,205 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:38,243 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:38,251 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:38,258 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:38,480 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-11-07 01:32:38,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:32:38,487 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:32:39,445 WARN L191 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 53 [2019-11-07 01:32:39,751 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:32:39,751 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 11, 13] total 38 [2019-11-07 01:32:39,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288147847] [2019-11-07 01:32:39,752 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-11-07 01:32:39,754 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:32:39,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-11-07 01:32:39,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1275, Unknown=0, NotChecked=0, Total=1406 [2019-11-07 01:32:39,755 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 38 states. [2019-11-07 01:32:40,019 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 45 [2019-11-07 01:32:40,695 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 50 [2019-11-07 01:32:40,961 WARN L191 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 69 [2019-11-07 01:32:41,574 WARN L191 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 65 [2019-11-07 01:32:41,738 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 46 [2019-11-07 01:32:41,989 WARN L191 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 65 [2019-11-07 01:32:42,345 WARN L191 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 61 [2019-11-07 01:32:42,517 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 47 [2019-11-07 01:32:42,870 WARN L191 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 59 [2019-11-07 01:32:43,433 WARN L191 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 61 [2019-11-07 01:32:43,736 WARN L191 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 65 [2019-11-07 01:32:43,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:32:43,930 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2019-11-07 01:32:43,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-07 01:32:43,931 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 29 [2019-11-07 01:32:43,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:32:43,935 INFO L225 Difference]: With dead ends: 39 [2019-11-07 01:32:43,936 INFO L226 Difference]: Without dead ends: 37 [2019-11-07 01:32:43,938 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=387, Invalid=2919, Unknown=0, NotChecked=0, Total=3306 [2019-11-07 01:32:43,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-07 01:32:43,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-11-07 01:32:43,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:32:43,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-11-07 01:32:43,978 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2019-11-07 01:32:43,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:32:43,979 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-11-07 01:32:43,979 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-11-07 01:32:43,979 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-11-07 01:32:43,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-07 01:32:43,981 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:32:43,982 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:32:44,185 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:32:44,186 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:32:44,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:32:44,187 INFO L82 PathProgramCache]: Analyzing trace with hash 490960333, now seen corresponding path program 3 times [2019-11-07 01:32:44,187 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:32:44,187 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223993347] [2019-11-07 01:32:44,188 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:32:44,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:32:44,678 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 24 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:32:44,679 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223993347] [2019-11-07 01:32:44,679 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883432653] [2019-11-07 01:32:44,679 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 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 01:32:44,750 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:32:44,750 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:32:44,751 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-07 01:32:44,754 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:32:44,973 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:32:44,973 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:32:45,163 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:32:45,163 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [440128282] [2019-11-07 01:32:45,165 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-11-07 01:32:45,165 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:32:45,165 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:32:45,165 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:32:45,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:32:45,189 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:32:45,245 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:45,345 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:45,393 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:45,403 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:45,412 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:45,438 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:45,685 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-11-07 01:32:45,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:32:45,691 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:32:46,235 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 43 [2019-11-07 01:32:46,712 WARN L191 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 53 [2019-11-07 01:32:47,030 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:32:47,030 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 10, 13] total 41 [2019-11-07 01:32:47,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242394659] [2019-11-07 01:32:47,033 INFO L442 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-11-07 01:32:47,033 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:32:47,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-11-07 01:32:47,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=1411, Unknown=0, NotChecked=0, Total=1640 [2019-11-07 01:32:47,034 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 41 states. [2019-11-07 01:32:47,302 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2019-11-07 01:32:47,954 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 56 [2019-11-07 01:32:49,004 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 51 [2019-11-07 01:32:49,187 WARN L191 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 54 [2019-11-07 01:32:49,521 WARN L191 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 52 [2019-11-07 01:32:49,845 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 51 [2019-11-07 01:32:50,157 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 54 [2019-11-07 01:32:50,372 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 48 [2019-11-07 01:32:50,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:32:50,602 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2019-11-07 01:32:50,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-07 01:32:50,605 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 43 [2019-11-07 01:32:50,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:32:50,606 INFO L225 Difference]: With dead ends: 67 [2019-11-07 01:32:50,607 INFO L226 Difference]: Without dead ends: 37 [2019-11-07 01:32:50,609 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 94 SyntacticMatches, 6 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1561 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=663, Invalid=4029, Unknown=0, NotChecked=0, Total=4692 [2019-11-07 01:32:50,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-07 01:32:50,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-11-07 01:32:50,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-07 01:32:50,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2019-11-07 01:32:50,618 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 43 [2019-11-07 01:32:50,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:32:50,619 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2019-11-07 01:32:50,619 INFO L463 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-11-07 01:32:50,619 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2019-11-07 01:32:50,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-07 01:32:50,620 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:32:50,620 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:32:50,832 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:32:50,833 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:32:50,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:32:50,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1606685947, now seen corresponding path program 4 times [2019-11-07 01:32:50,833 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:32:50,834 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005674972] [2019-11-07 01:32:50,834 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:32:50,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:32:51,194 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:32:51,195 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005674972] [2019-11-07 01:32:51,195 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600721782] [2019-11-07 01:32:51,195 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 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 01:32:51,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:32:51,270 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-07 01:32:51,275 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:32:52,174 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:32:52,174 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:32:52,535 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:32:52,535 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1046646112] [2019-11-07 01:32:52,536 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-11-07 01:32:52,536 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:32:52,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:32:52,537 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:32:52,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:32:52,569 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:32:52,688 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:52,728 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:52,814 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:52,865 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:52,874 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:52,894 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:32:53,162 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-11-07 01:32:53,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:32:53,171 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:32:54,260 WARN L191 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 53 [2019-11-07 01:32:54,710 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:32:54,710 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 14, 13] total 49 [2019-11-07 01:32:54,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228035169] [2019-11-07 01:32:54,712 INFO L442 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-11-07 01:32:54,712 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:32:54,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-11-07 01:32:54,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2182, Unknown=0, NotChecked=0, Total=2352 [2019-11-07 01:32:54,713 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 49 states. [2019-11-07 01:32:55,016 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 45 [2019-11-07 01:32:55,517 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 46 [2019-11-07 01:32:55,817 WARN L191 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 66 [2019-11-07 01:32:56,041 WARN L191 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 49 [2019-11-07 01:32:56,372 WARN L191 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 59 [2019-11-07 01:32:56,711 WARN L191 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 68 [2019-11-07 01:32:56,938 WARN L191 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 53 [2019-11-07 01:32:57,202 WARN L191 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2019-11-07 01:32:57,802 WARN L191 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 65 [2019-11-07 01:32:58,003 WARN L191 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 48 [2019-11-07 01:32:58,288 WARN L191 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 64 [2019-11-07 01:32:58,668 WARN L191 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 61 [2019-11-07 01:32:58,917 WARN L191 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 47 [2019-11-07 01:32:59,232 WARN L191 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 65 [2019-11-07 01:32:59,641 WARN L191 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 62 [2019-11-07 01:32:59,880 WARN L191 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 46 [2019-11-07 01:33:00,200 WARN L191 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 64 [2019-11-07 01:33:00,618 WARN L191 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 61 [2019-11-07 01:33:00,974 WARN L191 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 57 [2019-11-07 01:33:01,534 WARN L191 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 61 [2019-11-07 01:33:01,833 WARN L191 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 64 [2019-11-07 01:33:01,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:33:01,957 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2019-11-07 01:33:01,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-07 01:33:01,958 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 44 [2019-11-07 01:33:01,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:33:01,960 INFO L225 Difference]: With dead ends: 51 [2019-11-07 01:33:01,961 INFO L226 Difference]: Without dead ends: 49 [2019-11-07 01:33:01,963 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 97 SyntacticMatches, 4 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1300 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=588, Invalid=5418, Unknown=0, NotChecked=0, Total=6006 [2019-11-07 01:33:01,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-07 01:33:01,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2019-11-07 01:33:01,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-07 01:33:01,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2019-11-07 01:33:01,976 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 44 [2019-11-07 01:33:01,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:33:01,976 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2019-11-07 01:33:01,976 INFO L463 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-11-07 01:33:01,976 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2019-11-07 01:33:01,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-11-07 01:33:01,978 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:33:01,978 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:33:02,182 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:33:02,182 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:33:02,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:33:02,183 INFO L82 PathProgramCache]: Analyzing trace with hash 1861940549, now seen corresponding path program 5 times [2019-11-07 01:33:02,183 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:33:02,183 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254446061] [2019-11-07 01:33:02,183 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:33:02,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:33:02,725 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 53 proven. 22 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-11-07 01:33:02,725 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254446061] [2019-11-07 01:33:02,725 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734783705] [2019-11-07 01:33:02,725 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 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 01:33:02,860 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-11-07 01:33:02,861 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:33:02,863 INFO L256 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-07 01:33:02,866 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:33:03,261 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 69 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-11-07 01:33:03,262 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:33:03,506 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 69 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-11-07 01:33:03,507 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1173130169] [2019-11-07 01:33:03,508 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-11-07 01:33:03,508 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:33:03,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:33:03,508 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:33:03,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:33:03,533 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:33:03,616 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:33:03,667 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:33:03,677 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:33:03,693 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:33:03,755 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:33:03,811 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:33:04,128 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-11-07 01:33:04,140 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:33:04,146 INFO L180 IcfgInterpreter]: Interpretation finished