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 0.1.24-13a467a-m [2019-10-15 01:38:22,183 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:38:22,185 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:38:22,197 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:38:22,198 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:38:22,199 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:38:22,200 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:38:22,201 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:38:22,203 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:38:22,204 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:38:22,205 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:38:22,206 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:38:22,206 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:38:22,207 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:38:22,208 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:38:22,209 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:38:22,210 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:38:22,211 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:38:22,213 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:38:22,215 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:38:22,217 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:38:22,221 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:38:22,223 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:38:22,224 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:38:22,228 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:38:22,239 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:38:22,240 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:38:22,240 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:38:22,241 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 [2019-10-15 01:38:22,258 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:38:22,260 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:38:22,261 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:38:22,262 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:38:22,262 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:38:22,262 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:38:22,262 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:38:22,262 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:38:22,263 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:38:22,263 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:38:22,263 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:38:22,263 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:38:22,263 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:38:22,264 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:38:22,264 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:38:22,265 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:38:22,265 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:38:22,266 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:38:22,266 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:38:22,266 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:38:22,266 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:38:22,267 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:38:22,267 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:38:22,267 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:38:22,267 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:38:22,267 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:38:22,268 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:38:22,268 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:38:22,268 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 [2019-10-15 01:38:22,526 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:38:22,539 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:38:22,542 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:38:22,544 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:38:22,544 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:38:22,545 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/pr2.c [2019-10-15 01:38:22,602 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4a6a2e022/e5b04d2bda1241f2b7f06557d2cdcf45/FLAG44b7bc4f7 [2019-10-15 01:38:23,027 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:38:23,029 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/pr2.c [2019-10-15 01:38:23,035 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4a6a2e022/e5b04d2bda1241f2b7f06557d2cdcf45/FLAG44b7bc4f7 [2019-10-15 01:38:23,418 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4a6a2e022/e5b04d2bda1241f2b7f06557d2cdcf45 [2019-10-15 01:38:23,425 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:38:23,427 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:38:23,427 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:23,428 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:38:23,430 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:38:23,431 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:23" (1/1) ... [2019-10-15 01:38:23,434 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a57a4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23, skipping insertion in model container [2019-10-15 01:38:23,434 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:23" (1/1) ... [2019-10-15 01:38:23,439 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:38:23,456 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:38:23,648 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:23,652 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:38:23,674 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:23,690 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:38:23,691 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23 WrapperNode [2019-10-15 01:38:23,691 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:23,691 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:38:23,692 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:38:23,692 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:38:23,776 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23" (1/1) ... [2019-10-15 01:38:23,777 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23" (1/1) ... [2019-10-15 01:38:23,783 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23" (1/1) ... [2019-10-15 01:38:23,784 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23" (1/1) ... [2019-10-15 01:38:23,791 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23" (1/1) ... [2019-10-15 01:38:23,796 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23" (1/1) ... [2019-10-15 01:38:23,798 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23" (1/1) ... [2019-10-15 01:38:23,800 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:38:23,800 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:38:23,801 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:38:23,801 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:38:23,802 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23" (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 [2019-10-15 01:38:23,857 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:38:23,857 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:38:23,857 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:38:23,857 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:38:23,857 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:38:23,858 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:38:23,858 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:38:23,858 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:38:23,858 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:38:23,858 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:38:23,859 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:38:23,859 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:38:23,859 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:38:23,859 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:38:23,860 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:38:24,275 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:38:24,276 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 01:38:24,277 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:24 BoogieIcfgContainer [2019-10-15 01:38:24,277 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:38:24,278 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:38:24,278 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:38:24,281 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:38:24,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:38:23" (1/3) ... [2019-10-15 01:38:24,282 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b1ab96d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:24, skipping insertion in model container [2019-10-15 01:38:24,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:23" (2/3) ... [2019-10-15 01:38:24,283 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b1ab96d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:24, skipping insertion in model container [2019-10-15 01:38:24,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:24" (3/3) ... [2019-10-15 01:38:24,286 INFO L109 eAbstractionObserver]: Analyzing ICFG pr2.c [2019-10-15 01:38:24,293 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:38:24,299 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:38:24,309 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:38:24,331 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:38:24,332 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:38:24,332 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:38:24,332 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:38:24,332 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:38:24,332 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:38:24,332 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:38:24,333 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:38:24,350 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-10-15 01:38:24,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:38:24,356 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:24,356 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:24,359 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:24,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:24,364 INFO L82 PathProgramCache]: Analyzing trace with hash -1554635187, now seen corresponding path program 1 times [2019-10-15 01:38:24,371 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:24,372 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424586042] [2019-10-15 01:38:24,372 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:24,372 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:24,372 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:24,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:24,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:24,614 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424586042] [2019-10-15 01:38:24,615 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:38:24,615 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:38:24,616 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654186972] [2019-10-15 01:38:24,622 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:38:24,623 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:24,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:38:24,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:38:24,636 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2019-10-15 01:38:24,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:24,730 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2019-10-15 01:38:24,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:38:24,732 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-10-15 01:38:24,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:24,741 INFO L225 Difference]: With dead ends: 42 [2019-10-15 01:38:24,741 INFO L226 Difference]: Without dead ends: 18 [2019-10-15 01:38:24,745 INFO L600 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 [2019-10-15 01:38:24,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-15 01:38:24,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-10-15 01:38:24,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 01:38:24,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-10-15 01:38:24,783 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2019-10-15 01:38:24,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:24,783 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-10-15 01:38:24,783 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:38:24,784 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-10-15 01:38:24,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:38:24,785 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:24,785 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:24,785 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:24,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:24,786 INFO L82 PathProgramCache]: Analyzing trace with hash 3214725, now seen corresponding path program 1 times [2019-10-15 01:38:24,786 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:24,787 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101824671] [2019-10-15 01:38:24,787 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:24,787 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:24,787 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:24,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:25,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:25,206 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101824671] [2019-10-15 01:38:25,209 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403845769] [2019-10-15 01:38:25,210 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 [2019-10-15 01:38:25,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:25,272 INFO L256 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-15 01:38:25,282 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:25,383 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,385 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,390 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,440 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:25,441 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 01:38:25,544 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 39 [2019-10-15 01:38:25,545 INFO L567 ElimStorePlain]: treesize reduction 3, result has 96.3 percent of original size [2019-10-15 01:38:25,554 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-15 01:38:25,573 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 [2019-10-15 01:38:25,574 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-10-15 01:38:25,617 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 01:38:25,624 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-15 01:38:25,626 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-15 01:38:25,632 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 [2019-10-15 01:38:25,633 INFO L496 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2019-10-15 01:38:25,681 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 01:38:25,687 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-15 01:38:25,689 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-15 01:38:25,694 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 [2019-10-15 01:38:25,694 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2019-10-15 01:38:25,734 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 01:38:25,736 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-2 vars, End of recursive call: and 3 xjuncts. [2019-10-15 01:38:25,737 INFO L221 ElimStorePlain]: Needed 5 recursive calls to eliminate 6 variables, input treesize:111, output treesize:80 [2019-10-15 01:38:25,857 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-10-15 01:38:25,859 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,862 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,864 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,866 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,870 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,876 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,882 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,884 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:25,927 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:25,937 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,937 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,941 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,943 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,990 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:25,994 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:26,001 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:26,039 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 [2019-10-15 01:38:26,045 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-15 01:38:26,055 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-15 01:38:26,066 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 [2019-10-15 01:38:26,067 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:26,069 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:26,071 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-10-15 01:38:26,084 INFO L567 ElimStorePlain]: treesize reduction 12, result has 53.8 percent of original size [2019-10-15 01:38:26,084 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-10-15 01:38:26,112 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 01:38:26,118 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 [2019-10-15 01:38:26,122 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-15 01:38:26,127 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-15 01:38:26,132 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 [2019-10-15 01:38:26,133 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:26,133 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:26,134 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2019-10-15 01:38:26,146 INFO L567 ElimStorePlain]: treesize reduction 12, result has 53.8 percent of original size [2019-10-15 01:38:26,147 INFO L496 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-10-15 01:38:26,194 INFO L567 ElimStorePlain]: treesize reduction 25, result has 80.2 percent of original size [2019-10-15 01:38:26,199 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 [2019-10-15 01:38:26,203 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-15 01:38:26,209 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-15 01:38:26,213 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 [2019-10-15 01:38:26,214 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:26,214 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:26,215 INFO L496 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2019-10-15 01:38:26,225 INFO L567 ElimStorePlain]: treesize reduction 13, result has 38.1 percent of original size [2019-10-15 01:38:26,226 INFO L496 ElimStorePlain]: Start of recursive call 6: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-10-15 01:38:26,236 INFO L567 ElimStorePlain]: treesize reduction 52, result has 13.3 percent of original size [2019-10-15 01:38:26,236 INFO L464 ElimStorePlain]: Eliminatee v_prenex_7 vanished before elimination [2019-10-15 01:38:26,236 INFO L496 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 4 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 01:38:26,237 INFO L221 ElimStorePlain]: Needed 7 recursive calls to eliminate 8 variables, input treesize:206, output treesize:8 [2019-10-15 01:38:26,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:26,270 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2036454563] [2019-10-15 01:38:26,302 INFO L162 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-10-15 01:38:26,302 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:26,309 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:26,317 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:26,317 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:26,451 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:38:26,838 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,028 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 150 [2019-10-15 01:38:27,048 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,230 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2019-10-15 01:38:27,270 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,397 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,411 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,424 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,629 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2019-10-15 01:38:27,756 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,823 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,835 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,845 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,923 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,958 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:28,128 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2019-10-15 01:38:28,148 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:28,155 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:29,002 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:29,003 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 11] total 29 [2019-10-15 01:38:29,003 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446396159] [2019-10-15 01:38:29,005 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-15 01:38:29,006 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:29,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-15 01:38:29,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=724, Unknown=0, NotChecked=0, Total=812 [2019-10-15 01:38:29,008 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 29 states. [2019-10-15 01:38:29,605 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 43 [2019-10-15 01:38:29,749 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 44 [2019-10-15 01:38:30,163 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 42 [2019-10-15 01:38:30,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:30,348 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2019-10-15 01:38:30,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-15 01:38:30,348 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 14 [2019-10-15 01:38:30,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:30,351 INFO L225 Difference]: With dead ends: 30 [2019-10-15 01:38:30,351 INFO L226 Difference]: Without dead ends: 28 [2019-10-15 01:38:30,352 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=185, Invalid=1297, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:38:30,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-15 01:38:30,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-10-15 01:38:30,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-15 01:38:30,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-10-15 01:38:30,364 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 14 [2019-10-15 01:38:30,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:30,364 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-10-15 01:38:30,364 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-15 01:38:30,364 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-10-15 01:38:30,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:38:30,366 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:30,366 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:30,570 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:30,573 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:30,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:30,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1342289861, now seen corresponding path program 1 times [2019-10-15 01:38:30,573 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:30,574 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591850887] [2019-10-15 01:38:30,574 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:30,574 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:30,574 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:30,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:30,892 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:38:30,893 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591850887] [2019-10-15 01:38:30,893 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660763333] [2019-10-15 01:38:30,893 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 [2019-10-15 01:38:30,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:30,951 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:38:30,954 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:31,119 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:38:31,119 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:31,228 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:38:31,228 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325347570] [2019-10-15 01:38:31,230 INFO L162 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-10-15 01:38:31,230 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:31,231 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:31,231 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:31,231 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:31,270 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:38:31,484 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:31,614 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:31,744 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:31,834 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:31,846 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:31,856 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:32,071 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:32,110 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:32,173 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:32,182 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:32,190 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:32,222 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:33,283 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-10-15 01:38:33,320 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:33,325 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:33,778 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 44 [2019-10-15 01:38:34,451 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:34,452 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 7, 13] total 32 [2019-10-15 01:38:34,452 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74912349] [2019-10-15 01:38:34,454 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-15 01:38:34,454 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:34,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-15 01:38:34,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=860, Unknown=0, NotChecked=0, Total=992 [2019-10-15 01:38:34,455 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 32 states. [2019-10-15 01:38:34,705 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 49 [2019-10-15 01:38:36,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:36,298 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2019-10-15 01:38:36,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-15 01:38:36,304 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 28 [2019-10-15 01:38:36,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:36,305 INFO L225 Difference]: With dead ends: 49 [2019-10-15 01:38:36,305 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 01:38:36,307 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 736 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=339, Invalid=2111, Unknown=0, NotChecked=0, Total=2450 [2019-10-15 01:38:36,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 01:38:36,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-10-15 01:38:36,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-15 01:38:36,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-10-15 01:38:36,313 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 28 [2019-10-15 01:38:36,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:36,314 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-10-15 01:38:36,314 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-15 01:38:36,314 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-10-15 01:38:36,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 01:38:36,315 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:36,315 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:36,517 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:36,518 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:36,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:36,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1527019917, now seen corresponding path program 2 times [2019-10-15 01:38:36,519 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:36,520 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409776695] [2019-10-15 01:38:36,520 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:36,520 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:36,521 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:36,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:36,757 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:38:36,758 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409776695] [2019-10-15 01:38:36,758 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485065876] [2019-10-15 01:38:36,758 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 [2019-10-15 01:38:36,839 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:38:36,840 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:38:36,841 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-15 01:38:36,844 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:36,914 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:37,617 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:38:37,617 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:37,837 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:38:37,837 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1796729055] [2019-10-15 01:38:37,839 INFO L162 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-10-15 01:38:37,839 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:37,839 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:37,840 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:37,840 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:37,867 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:38:38,110 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:38,293 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 150 [2019-10-15 01:38:38,315 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:38,497 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2019-10-15 01:38:38,518 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:38,539 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:38,562 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:38,689 WARN L191 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2019-10-15 01:38:38,709 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:39,022 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:39,139 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:39,242 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:39,273 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:39,281 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:39,287 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:40,175 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-10-15 01:38:40,219 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:40,223 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:41,638 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:41,638 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 11, 13] total 38 [2019-10-15 01:38:41,638 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723554250] [2019-10-15 01:38:41,639 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-10-15 01:38:41,640 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:41,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-10-15 01:38:41,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1275, Unknown=0, NotChecked=0, Total=1406 [2019-10-15 01:38:41,641 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 38 states. [2019-10-15 01:38:42,228 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 53 [2019-10-15 01:38:42,414 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 47 [2019-10-15 01:38:42,558 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 46 [2019-10-15 01:38:43,011 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 47 [2019-10-15 01:38:43,168 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2019-10-15 01:38:43,373 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 47 [2019-10-15 01:38:43,531 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 47 [2019-10-15 01:38:43,870 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2019-10-15 01:38:44,327 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 54 [2019-10-15 01:38:44,813 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 48 [2019-10-15 01:38:44,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:44,818 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2019-10-15 01:38:44,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-15 01:38:44,818 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 29 [2019-10-15 01:38:44,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:44,820 INFO L225 Difference]: With dead ends: 40 [2019-10-15 01:38:44,820 INFO L226 Difference]: Without dead ends: 38 [2019-10-15 01:38:44,822 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=374, Invalid=2818, Unknown=0, NotChecked=0, Total=3192 [2019-10-15 01:38:44,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-15 01:38:44,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2019-10-15 01:38:44,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 01:38:44,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-10-15 01:38:44,838 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2019-10-15 01:38:44,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:44,839 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-10-15 01:38:44,839 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-10-15 01:38:44,840 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-10-15 01:38:44,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-15 01:38:44,841 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:44,844 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:45,054 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:45,054 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:45,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:45,055 INFO L82 PathProgramCache]: Analyzing trace with hash 490960333, now seen corresponding path program 3 times [2019-10-15 01:38:45,056 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:45,056 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810987438] [2019-10-15 01:38:45,056 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:45,057 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:45,057 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:45,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:45,393 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 24 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:38:45,394 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810987438] [2019-10-15 01:38:45,394 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823482219] [2019-10-15 01:38:45,394 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 [2019-10-15 01:38:45,492 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:38:45,492 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:38:45,493 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-15 01:38:45,495 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:45,718 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:38:45,718 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:45,866 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:38:45,867 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089968149] [2019-10-15 01:38:45,868 INFO L162 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-10-15 01:38:45,868 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:45,869 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:45,869 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:45,869 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:45,890 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:38:46,043 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,161 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,174 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,185 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,270 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,395 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,588 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,650 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,728 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,756 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,764 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:46,771 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:47,519 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-10-15 01:38:47,543 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:47,550 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:48,743 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:48,744 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 10, 13] total 41 [2019-10-15 01:38:48,744 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272004864] [2019-10-15 01:38:48,745 INFO L442 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-10-15 01:38:48,746 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:48,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-10-15 01:38:48,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=1411, Unknown=0, NotChecked=0, Total=1640 [2019-10-15 01:38:48,747 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 41 states. [2019-10-15 01:38:48,992 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 49 [2019-10-15 01:38:49,727 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 38 [2019-10-15 01:38:49,855 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 36 [2019-10-15 01:38:51,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:51,160 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2019-10-15 01:38:51,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-15 01:38:51,163 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 43 [2019-10-15 01:38:51,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:51,165 INFO L225 Difference]: With dead ends: 67 [2019-10-15 01:38:51,165 INFO L226 Difference]: Without dead ends: 37 [2019-10-15 01:38:51,167 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 94 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1411 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=565, Invalid=3467, Unknown=0, NotChecked=0, Total=4032 [2019-10-15 01:38:51,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-15 01:38:51,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-10-15 01:38:51,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-15 01:38:51,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2019-10-15 01:38:51,175 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 43 [2019-10-15 01:38:51,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:51,176 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2019-10-15 01:38:51,176 INFO L463 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-10-15 01:38:51,176 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2019-10-15 01:38:51,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-15 01:38:51,177 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:51,177 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:51,383 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:51,383 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:51,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:51,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1606685947, now seen corresponding path program 4 times [2019-10-15 01:38:51,385 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:51,385 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832014409] [2019-10-15 01:38:51,386 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:51,386 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:51,386 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:51,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:51,731 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:38:51,732 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832014409] [2019-10-15 01:38:51,732 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56095304] [2019-10-15 01:38:51,732 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 [2019-10-15 01:38:51,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:51,841 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-15 01:38:51,846 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:52,652 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:38:52,653 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:52,969 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:38:52,969 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1292246099] [2019-10-15 01:38:52,971 INFO L162 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-10-15 01:38:52,971 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:52,971 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:52,972 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:52,972 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:52,999 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:38:53,149 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,258 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,273 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,290 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,420 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,501 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,675 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,703 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,759 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,815 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,833 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:53,840 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:54,556 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-10-15 01:38:54,583 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:54,585 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:56,165 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:56,165 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 14, 13] total 49 [2019-10-15 01:38:56,165 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265694879] [2019-10-15 01:38:56,167 INFO L442 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-10-15 01:38:56,167 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:56,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-10-15 01:38:56,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2182, Unknown=0, NotChecked=0, Total=2352 [2019-10-15 01:38:56,169 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 49 states. [2019-10-15 01:38:56,923 WARN L191 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 46 [2019-10-15 01:38:57,226 WARN L191 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 67 [2019-10-15 01:38:57,435 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 46 [2019-10-15 01:38:57,747 WARN L191 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 60 [2019-10-15 01:38:58,035 WARN L191 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 54 [2019-10-15 01:38:58,299 WARN L191 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 47 [2019-10-15 01:38:58,686 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 47 [2019-10-15 01:38:58,898 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 48 [2019-10-15 01:38:59,145 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 49 [2019-10-15 01:38:59,358 WARN L191 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 47 [2019-10-15 01:38:59,593 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 46 [2019-10-15 01:38:59,818 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 46 [2019-10-15 01:39:00,047 WARN L191 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 45 [2019-10-15 01:39:00,279 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 47 [2019-10-15 01:39:00,652 WARN L191 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2019-10-15 01:39:00,874 WARN L191 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 45 [2019-10-15 01:39:01,173 WARN L191 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2019-10-15 01:39:01,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:01,177 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2019-10-15 01:39:01,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-15 01:39:01,180 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 44 [2019-10-15 01:39:01,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:01,182 INFO L225 Difference]: With dead ends: 52 [2019-10-15 01:39:01,182 INFO L226 Difference]: Without dead ends: 50 [2019-10-15 01:39:01,184 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 97 SyntacticMatches, 4 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1216 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=533, Invalid=5017, Unknown=0, NotChecked=0, Total=5550 [2019-10-15 01:39:01,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-15 01:39:01,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2019-10-15 01:39:01,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-15 01:39:01,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2019-10-15 01:39:01,195 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 44 [2019-10-15 01:39:01,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:01,196 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2019-10-15 01:39:01,196 INFO L463 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-10-15 01:39:01,196 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2019-10-15 01:39:01,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-10-15 01:39:01,198 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:01,198 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:01,402 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:01,403 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:01,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:01,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1861940549, now seen corresponding path program 5 times [2019-10-15 01:39:01,404 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:01,404 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919188143] [2019-10-15 01:39:01,404 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:01,405 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:01,405 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:01,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:01,857 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 53 proven. 22 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-15 01:39:01,858 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919188143] [2019-10-15 01:39:01,858 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152840353] [2019-10-15 01:39:01,858 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 [2019-10-15 01:39:02,043 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-10-15 01:39:02,043 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:02,044 INFO L256 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-15 01:39:02,047 INFO L279 TraceCheckSpWp]: Computing forward predicates...