java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/standard_copy2_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:32:31,436 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:32:31,438 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:32:31,456 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:32:31,457 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:32:31,458 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:32:31,460 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:32:31,468 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:32:31,472 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:32:31,473 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:32:31,474 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:32:31,475 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:32:31,475 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:32:31,476 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:32:31,477 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:32:31,478 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:32:31,479 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:32:31,480 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:32:31,482 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:32:31,483 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:32:31,485 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:32:31,486 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:32:31,487 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:32:31,488 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:32:31,490 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:32:31,498 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:32:31,499 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:32:31,499 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:32:31,500 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 01:32:31,514 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:32:31,514 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:32:31,516 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:32:31,516 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:32:31,516 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:32:31,516 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:32:31,516 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:32:31,517 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:32:31,517 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:32:31,517 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:32:31,517 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:32:31,518 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:32:31,518 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:32:31,518 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:32:31,518 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:32:31,518 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:32:31,519 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:32:31,519 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:32:31,519 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:32:31,519 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:32:31,519 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:32:31,520 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:32:31,520 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:32:31,520 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:32:31,520 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:32:31,520 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:32:31,521 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:32:31,521 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:32:31,521 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 01:32:31,808 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:32:31,821 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:32:31,825 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:32:31,826 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:32:31,827 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:32:31,827 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy2_ground-2.i [2019-10-15 01:32:31,889 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f20e6cf0/ce9002cc4a3f421bbdb7cb8b858b2d59/FLAGadd007ddb [2019-10-15 01:32:32,328 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:32:32,329 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy2_ground-2.i [2019-10-15 01:32:32,338 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f20e6cf0/ce9002cc4a3f421bbdb7cb8b858b2d59/FLAGadd007ddb [2019-10-15 01:32:32,723 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f20e6cf0/ce9002cc4a3f421bbdb7cb8b858b2d59 [2019-10-15 01:32:32,736 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:32:32,738 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:32:32,739 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:32:32,739 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:32:32,743 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:32:32,744 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,747 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c19cb95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:32, skipping insertion in model container [2019-10-15 01:32:32,748 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:32:32" (1/1) ... [2019-10-15 01:32:32,755 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:32:32,771 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:32:32,951 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:32:32,958 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:32:32,988 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:32:33,007 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:32:33,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33 WrapperNode [2019-10-15 01:32:33,008 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:32:33,009 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:32:33,009 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:32:33,009 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:32:33,114 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33" (1/1) ... [2019-10-15 01:32:33,114 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33" (1/1) ... [2019-10-15 01:32:33,123 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33" (1/1) ... [2019-10-15 01:32:33,123 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33" (1/1) ... [2019-10-15 01:32:33,143 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33" (1/1) ... [2019-10-15 01:32:33,149 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33" (1/1) ... [2019-10-15 01:32:33,150 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33" (1/1) ... [2019-10-15 01:32:33,153 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:32:33,153 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:32:33,153 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:32:33,153 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:32:33,154 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33" (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 01:32:33,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:32:33,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:32:33,210 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:32:33,210 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:32:33,210 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:32:33,211 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:32:33,211 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:32:33,211 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:32:33,211 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:32:33,211 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:32:33,211 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:32:33,212 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:32:33,212 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:32:33,212 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:32:33,603 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:32:33,603 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-15 01:32:33,604 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:32:33 BoogieIcfgContainer [2019-10-15 01:32:33,604 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:32:33,605 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:32:33,605 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:32:33,607 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:32:33,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:32:32" (1/3) ... [2019-10-15 01:32:33,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@141b76f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:32:33, skipping insertion in model container [2019-10-15 01:32:33,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:33" (2/3) ... [2019-10-15 01:32:33,609 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@141b76f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:32:33, skipping insertion in model container [2019-10-15 01:32:33,609 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:32:33" (3/3) ... [2019-10-15 01:32:33,610 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy2_ground-2.i [2019-10-15 01:32:33,617 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:32:33,623 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:32:33,633 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:32:33,655 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:32:33,655 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:32:33,655 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:32:33,655 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:32:33,656 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:32:33,656 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:32:33,656 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:32:33,656 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:32:33,670 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-10-15 01:32:33,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:32:33,674 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:33,675 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:33,677 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:33,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:33,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1272573714, now seen corresponding path program 1 times [2019-10-15 01:32:33,688 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:33,688 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8882728] [2019-10-15 01:32:33,689 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:33,689 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:33,689 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:33,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:33,847 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 01:32:33,848 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8882728] [2019-10-15 01:32:33,849 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:32:33,850 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:32:33,851 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807690123] [2019-10-15 01:32:33,855 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:32:33,856 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:33,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:32:33,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:33,875 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2019-10-15 01:32:33,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:33,916 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2019-10-15 01:32:33,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:32:33,918 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-10-15 01:32:33,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:33,926 INFO L225 Difference]: With dead ends: 35 [2019-10-15 01:32:33,927 INFO L226 Difference]: Without dead ends: 18 [2019-10-15 01:32:33,930 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:33,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-15 01:32:33,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-10-15 01:32:33,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 01:32:33,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2019-10-15 01:32:33,970 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 13 [2019-10-15 01:32:33,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:33,971 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2019-10-15 01:32:33,971 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:32:33,971 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2019-10-15 01:32:33,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:32:33,972 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:33,972 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:33,973 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:33,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:33,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1861910933, now seen corresponding path program 1 times [2019-10-15 01:32:33,974 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:33,974 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195884886] [2019-10-15 01:32:33,974 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:33,975 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:33,975 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:33,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:34,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:32:34,039 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195884886] [2019-10-15 01:32:34,039 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:32:34,039 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:32:34,039 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308663395] [2019-10-15 01:32:34,041 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:32:34,041 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:34,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:32:34,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:34,042 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand 3 states. [2019-10-15 01:32:34,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:34,060 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2019-10-15 01:32:34,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:32:34,061 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-15 01:32:34,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:34,062 INFO L225 Difference]: With dead ends: 30 [2019-10-15 01:32:34,062 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 01:32:34,063 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:34,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 01:32:34,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 01:32:34,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 01:32:34,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2019-10-15 01:32:34,069 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2019-10-15 01:32:34,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:34,069 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2019-10-15 01:32:34,070 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:32:34,070 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2019-10-15 01:32:34,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-15 01:32:34,071 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:34,071 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:34,071 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:34,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:34,072 INFO L82 PathProgramCache]: Analyzing trace with hash 728822389, now seen corresponding path program 1 times [2019-10-15 01:32:34,072 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:34,072 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442992843] [2019-10-15 01:32:34,072 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:34,073 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:34,073 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:34,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:34,168 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:32:34,168 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442992843] [2019-10-15 01:32:34,169 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384411088] [2019-10-15 01:32:34,169 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 01:32:34,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:34,244 INFO L256 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:32:34,254 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:34,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:32:34,316 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:34,354 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:32:34,355 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1912934986] [2019-10-15 01:32:34,406 INFO L162 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-10-15 01:32:34,406 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:34,420 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:34,428 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:34,433 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:34,599 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:35,024 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-10-15 01:32:35,318 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-10-15 01:32:35,424 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:35,439 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:35,446 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:35,806 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:35,815 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-10-15 01:32:35,815 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880003013] [2019-10-15 01:32:35,818 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:32:35,818 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:35,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:32:35,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:32:35,819 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand 18 states. [2019-10-15 01:32:36,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:36,504 INFO L93 Difference]: Finished difference Result 47 states and 57 transitions. [2019-10-15 01:32:36,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-15 01:32:36,505 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 16 [2019-10-15 01:32:36,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:36,506 INFO L225 Difference]: With dead ends: 47 [2019-10-15 01:32:36,506 INFO L226 Difference]: Without dead ends: 34 [2019-10-15 01:32:36,507 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=145, Invalid=785, Unknown=0, NotChecked=0, Total=930 [2019-10-15 01:32:36,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-15 01:32:36,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2019-10-15 01:32:36,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-15 01:32:36,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2019-10-15 01:32:36,514 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 16 [2019-10-15 01:32:36,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:36,515 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2019-10-15 01:32:36,515 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:32:36,515 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2019-10-15 01:32:36,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:32:36,516 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:36,516 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:36,720 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:36,720 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:36,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:36,721 INFO L82 PathProgramCache]: Analyzing trace with hash 1554625518, now seen corresponding path program 2 times [2019-10-15 01:32:36,722 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:36,722 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921022915] [2019-10-15 01:32:36,722 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:36,723 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:36,723 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:36,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:36,844 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:32:36,845 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921022915] [2019-10-15 01:32:36,845 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511738245] [2019-10-15 01:32:36,845 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:36,909 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:32:36,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:36,910 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:32:36,913 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:36,946 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-10-15 01:32:36,947 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:36,988 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-10-15 01:32:36,989 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [283632908] [2019-10-15 01:32:36,990 INFO L162 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-10-15 01:32:36,990 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:36,991 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:36,991 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:36,991 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:37,038 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:37,607 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:37,626 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:37,636 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:38,251 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:38,251 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5, 11] total 23 [2019-10-15 01:32:38,252 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239144119] [2019-10-15 01:32:38,253 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-15 01:32:38,253 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:38,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-15 01:32:38,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2019-10-15 01:32:38,254 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 23 states. [2019-10-15 01:32:39,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:39,158 INFO L93 Difference]: Finished difference Result 58 states and 72 transitions. [2019-10-15 01:32:39,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-15 01:32:39,159 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 21 [2019-10-15 01:32:39,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:39,161 INFO L225 Difference]: With dead ends: 58 [2019-10-15 01:32:39,161 INFO L226 Difference]: Without dead ends: 43 [2019-10-15 01:32:39,162 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=237, Invalid=1403, Unknown=0, NotChecked=0, Total=1640 [2019-10-15 01:32:39,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-15 01:32:39,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2019-10-15 01:32:39,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-15 01:32:39,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-10-15 01:32:39,171 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 21 [2019-10-15 01:32:39,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:39,172 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-10-15 01:32:39,172 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-15 01:32:39,172 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-10-15 01:32:39,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-15 01:32:39,173 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:39,173 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:39,376 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:39,377 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:39,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:39,378 INFO L82 PathProgramCache]: Analyzing trace with hash -149803285, now seen corresponding path program 3 times [2019-10-15 01:32:39,378 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:39,378 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601822794] [2019-10-15 01:32:39,379 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:39,379 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:39,379 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:39,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:39,542 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-15 01:32:39,543 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601822794] [2019-10-15 01:32:39,543 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894698023] [2019-10-15 01:32:39,543 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 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 01:32:39,633 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:39,637 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:39,638 INFO L256 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:32:39,641 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:39,702 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:32:39,702 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:39,797 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:32:39,797 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [698730520] [2019-10-15 01:32:39,799 INFO L162 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-10-15 01:32:39,799 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:39,799 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:39,800 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:39,800 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:39,823 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:40,313 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:40,324 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:40,327 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:40,686 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:40,686 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8, 11] total 31 [2019-10-15 01:32:40,686 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074141143] [2019-10-15 01:32:40,688 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-15 01:32:40,688 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:40,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-15 01:32:40,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=775, Unknown=0, NotChecked=0, Total=930 [2019-10-15 01:32:40,689 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 31 states. [2019-10-15 01:32:41,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:41,878 INFO L93 Difference]: Finished difference Result 75 states and 89 transitions. [2019-10-15 01:32:41,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-15 01:32:41,879 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 30 [2019-10-15 01:32:41,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:41,880 INFO L225 Difference]: With dead ends: 75 [2019-10-15 01:32:41,880 INFO L226 Difference]: Without dead ends: 52 [2019-10-15 01:32:41,883 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 789 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=473, Invalid=2719, Unknown=0, NotChecked=0, Total=3192 [2019-10-15 01:32:41,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-15 01:32:41,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 43. [2019-10-15 01:32:41,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-15 01:32:41,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2019-10-15 01:32:41,891 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 30 [2019-10-15 01:32:41,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:41,892 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2019-10-15 01:32:41,892 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-15 01:32:41,892 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2019-10-15 01:32:41,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-15 01:32:41,893 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:41,893 INFO L380 BasicCegarLoop]: trace histogram [12, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:42,096 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:42,097 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:42,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:42,098 INFO L82 PathProgramCache]: Analyzing trace with hash -1025373768, now seen corresponding path program 4 times [2019-10-15 01:32:42,098 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:42,098 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355775785] [2019-10-15 01:32:42,099 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:42,099 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:42,099 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:42,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:42,261 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2019-10-15 01:32:42,262 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355775785] [2019-10-15 01:32:42,262 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630005821] [2019-10-15 01:32:42,262 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 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 01:32:42,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:42,357 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-15 01:32:42,365 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:42,504 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-15 01:32:42,505 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:42,784 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-15 01:32:42,785 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [797050506] [2019-10-15 01:32:42,786 INFO L162 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-10-15 01:32:42,787 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:42,787 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:42,787 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:42,788 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:42,820 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:43,085 WARN L191 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-10-15 01:32:43,349 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:43,357 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:43,361 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:43,706 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:43,706 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15, 15, 11] total 46 [2019-10-15 01:32:43,707 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855288725] [2019-10-15 01:32:43,708 INFO L442 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-10-15 01:32:43,709 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:43,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-10-15 01:32:43,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=1619, Unknown=0, NotChecked=0, Total=2070 [2019-10-15 01:32:43,711 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 46 states. [2019-10-15 01:32:45,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:45,569 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2019-10-15 01:32:45,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-10-15 01:32:45,571 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 39 [2019-10-15 01:32:45,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:45,573 INFO L225 Difference]: With dead ends: 93 [2019-10-15 01:32:45,573 INFO L226 Difference]: Without dead ends: 68 [2019-10-15 01:32:45,575 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1839 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1363, Invalid=6119, Unknown=0, NotChecked=0, Total=7482 [2019-10-15 01:32:45,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-15 01:32:45,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 59. [2019-10-15 01:32:45,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-10-15 01:32:45,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2019-10-15 01:32:45,585 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 39 [2019-10-15 01:32:45,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:45,585 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2019-10-15 01:32:45,585 INFO L463 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-10-15 01:32:45,586 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2019-10-15 01:32:45,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-15 01:32:45,587 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:45,587 INFO L380 BasicCegarLoop]: trace histogram [26, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:45,791 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:45,791 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:45,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:45,792 INFO L82 PathProgramCache]: Analyzing trace with hash -738862322, now seen corresponding path program 5 times [2019-10-15 01:32:45,792 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:45,793 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136299586] [2019-10-15 01:32:45,793 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:45,793 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:45,793 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:45,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:46,238 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-10-15 01:32:46,238 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136299586] [2019-10-15 01:32:46,238 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833829522] [2019-10-15 01:32:46,239 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 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 01:32:46,662 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-15 01:32:46,662 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:46,663 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:32:46,666 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:46,917 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 387 trivial. 0 not checked. [2019-10-15 01:32:46,918 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:47,187 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 387 trivial. 0 not checked. [2019-10-15 01:32:47,188 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1474697414] [2019-10-15 01:32:47,190 INFO L162 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-10-15 01:32:47,190 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:47,191 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:47,192 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:47,192 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:47,213 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:47,652 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:47,659 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:47,662 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:48,233 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:48,233 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 11, 11, 11] total 57 [2019-10-15 01:32:48,233 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842334052] [2019-10-15 01:32:48,235 INFO L442 AbstractCegarLoop]: Interpolant automaton has 57 states [2019-10-15 01:32:48,235 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:48,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2019-10-15 01:32:48,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=624, Invalid=2568, Unknown=0, NotChecked=0, Total=3192 [2019-10-15 01:32:48,237 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 57 states. [2019-10-15 01:32:51,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:51,143 INFO L93 Difference]: Finished difference Result 116 states and 142 transitions. [2019-10-15 01:32:51,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2019-10-15 01:32:51,144 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 55 [2019-10-15 01:32:51,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:51,145 INFO L225 Difference]: With dead ends: 116 [2019-10-15 01:32:51,145 INFO L226 Difference]: Without dead ends: 89 [2019-10-15 01:32:51,149 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2789 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1902, Invalid=9870, Unknown=0, NotChecked=0, Total=11772 [2019-10-15 01:32:51,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-15 01:32:51,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 80. [2019-10-15 01:32:51,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-10-15 01:32:51,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 83 transitions. [2019-10-15 01:32:51,161 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 83 transitions. Word has length 55 [2019-10-15 01:32:51,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:51,161 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 83 transitions. [2019-10-15 01:32:51,161 INFO L463 AbstractCegarLoop]: Interpolant automaton has 57 states. [2019-10-15 01:32:51,161 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 83 transitions. [2019-10-15 01:32:51,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-10-15 01:32:51,164 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:51,164 INFO L380 BasicCegarLoop]: trace histogram [27, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:51,368 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:51,369 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:51,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:51,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1722620277, now seen corresponding path program 6 times [2019-10-15 01:32:51,370 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:51,370 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060953981] [2019-10-15 01:32:51,371 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:51,371 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:51,371 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:51,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:51,714 INFO L134 CoverageAnalysis]: Checked inductivity of 720 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 549 trivial. 0 not checked. [2019-10-15 01:32:51,714 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060953981] [2019-10-15 01:32:51,715 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920123121] [2019-10-15 01:32:51,715 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 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 01:32:51,844 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:51,845 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:51,846 INFO L256 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-15 01:32:51,852 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:52,410 INFO L134 CoverageAnalysis]: Checked inductivity of 720 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2019-10-15 01:32:52,410 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:53,505 INFO L134 CoverageAnalysis]: Checked inductivity of 720 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2019-10-15 01:32:53,505 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [346214233] [2019-10-15 01:32:53,506 INFO L162 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-10-15 01:32:53,507 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:53,507 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:53,507 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:53,507 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:53,534 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:53,996 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:54,003 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:54,009 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:54,511 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:54,512 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 30, 30, 11] total 87 [2019-10-15 01:32:54,512 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136174082] [2019-10-15 01:32:54,514 INFO L442 AbstractCegarLoop]: Interpolant automaton has 87 states [2019-10-15 01:32:54,514 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:54,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2019-10-15 01:32:54,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=5591, Unknown=0, NotChecked=0, Total=7482 [2019-10-15 01:32:54,517 INFO L87 Difference]: Start difference. First operand 80 states and 83 transitions. Second operand 87 states. [2019-10-15 01:32:59,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:59,350 INFO L93 Difference]: Finished difference Result 167 states and 203 transitions. [2019-10-15 01:32:59,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2019-10-15 01:32:59,350 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 76 [2019-10-15 01:32:59,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:59,352 INFO L225 Difference]: With dead ends: 167 [2019-10-15 01:32:59,353 INFO L226 Difference]: Without dead ends: 120 [2019-10-15 01:32:59,359 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6686 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5705, Invalid=22687, Unknown=0, NotChecked=0, Total=28392 [2019-10-15 01:32:59,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2019-10-15 01:32:59,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 111. [2019-10-15 01:32:59,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-10-15 01:32:59,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2019-10-15 01:32:59,375 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 76 [2019-10-15 01:32:59,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:59,376 INFO L462 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2019-10-15 01:32:59,376 INFO L463 AbstractCegarLoop]: Interpolant automaton has 87 states. [2019-10-15 01:32:59,376 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2019-10-15 01:32:59,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-10-15 01:32:59,378 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:59,378 INFO L380 BasicCegarLoop]: trace histogram [56, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:59,582 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:59,583 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:59,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:59,583 INFO L82 PathProgramCache]: Analyzing trace with hash 591761656, now seen corresponding path program 7 times [2019-10-15 01:32:59,584 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:59,584 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91829228] [2019-10-15 01:32:59,584 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:59,584 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:59,585 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:59,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:59,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1976 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 1786 trivial. 0 not checked. [2019-10-15 01:32:59,924 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91829228] [2019-10-15 01:32:59,924 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671474961] [2019-10-15 01:32:59,924 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:00,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:00,105 INFO L256 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 58 conjunts are in the unsatisfiable core [2019-10-15 01:33:00,112 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:01,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1976 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2019-10-15 01:33:01,806 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:05,881 INFO L134 CoverageAnalysis]: Checked inductivity of 1976 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2019-10-15 01:33:05,881 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1061076579] [2019-10-15 01:33:05,883 INFO L162 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-10-15 01:33:05,883 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:05,883 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:05,883 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:05,884 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:05,906 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:06,337 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:33:06,345 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:06,348 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:06,991 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:06,992 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 59, 59, 11] total 146 [2019-10-15 01:33:06,992 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2853984] [2019-10-15 01:33:06,993 INFO L442 AbstractCegarLoop]: Interpolant automaton has 146 states [2019-10-15 01:33:06,994 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:06,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2019-10-15 01:33:06,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6929, Invalid=14241, Unknown=0, NotChecked=0, Total=21170 [2019-10-15 01:33:06,996 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand 146 states.