/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_strcmp_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:47:01,016 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:47:01,018 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:47:01,031 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:47:01,031 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:47:01,032 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:47:01,034 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:47:01,035 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:47:01,037 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:47:01,038 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:47:01,039 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:47:01,040 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:47:01,040 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:47:01,041 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:47:01,042 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:47:01,043 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:47:01,044 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:47:01,045 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:47:01,047 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:47:01,049 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:47:01,051 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:47:01,052 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:47:01,053 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:47:01,054 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:47:01,056 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:47:01,064 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:47:01,065 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:47:01,066 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:47:01,067 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 18:47:01,081 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:47:01,082 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:47:01,083 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:47:01,083 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:47:01,083 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:47:01,084 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:47:01,084 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:47:01,084 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:47:01,084 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:47:01,084 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:47:01,085 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:47:01,085 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:47:01,085 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:47:01,085 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:47:01,085 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:47:01,086 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:47:01,086 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:47:01,086 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:47:01,086 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:47:01,086 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:47:01,087 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:47:01,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:47:01,087 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:47:01,087 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:47:01,087 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:47:01,088 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:47:01,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:47:01,088 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:47:01,088 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:47:01,420 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:47:01,432 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:47:01,436 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:47:01,437 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:47:01,437 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:47:01,438 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_strcmp_ground.i [2019-11-06 18:47:01,512 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce53b41b6/83b4feb7d99f48e4b724ab7c0e075cbe/FLAG4994d05fe [2019-11-06 18:47:01,912 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:47:01,912 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_strcmp_ground.i [2019-11-06 18:47:01,918 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce53b41b6/83b4feb7d99f48e4b724ab7c0e075cbe/FLAG4994d05fe [2019-11-06 18:47:02,320 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce53b41b6/83b4feb7d99f48e4b724ab7c0e075cbe [2019-11-06 18:47:02,329 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:47:02,330 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:47:02,334 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:47:02,335 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:47:02,337 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:47:02,343 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:47:02" (1/1) ... [2019-11-06 18:47:02,347 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19891321 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02, skipping insertion in model container [2019-11-06 18:47:02,348 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:47:02" (1/1) ... [2019-11-06 18:47:02,358 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:47:02,380 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:47:02,623 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:47:02,634 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:47:02,668 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:47:02,684 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:47:02,685 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02 WrapperNode [2019-11-06 18:47:02,685 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:47:02,686 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:47:02,686 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:47:02,686 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:47:02,792 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02" (1/1) ... [2019-11-06 18:47:02,792 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02" (1/1) ... [2019-11-06 18:47:02,800 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02" (1/1) ... [2019-11-06 18:47:02,800 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02" (1/1) ... [2019-11-06 18:47:02,808 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02" (1/1) ... [2019-11-06 18:47:02,815 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02" (1/1) ... [2019-11-06 18:47:02,819 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02" (1/1) ... [2019-11-06 18:47:02,826 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:47:02,826 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:47:02,826 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:47:02,826 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:47:02,827 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:47:02,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:47:02,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:47:02,884 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:47:02,884 INFO L138 BoogieDeclarations]: Found implementation of procedure _strcmp [2019-11-06 18:47:02,884 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:47:02,885 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:47:02,885 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:47:02,885 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:47:02,885 INFO L130 BoogieDeclarations]: Found specification of procedure _strcmp [2019-11-06 18:47:02,885 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:47:02,885 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:47:02,885 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:47:02,885 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:47:02,886 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:47:02,886 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:47:02,886 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:47:03,133 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:47:03,134 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:47:03,141 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:47:03 BoogieIcfgContainer [2019-11-06 18:47:03,141 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:47:03,142 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:47:03,143 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:47:03,149 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:47:03,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:47:02" (1/3) ... [2019-11-06 18:47:03,154 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e80eeed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:47:03, skipping insertion in model container [2019-11-06 18:47:03,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:02" (2/3) ... [2019-11-06 18:47:03,154 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e80eeed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:47:03, skipping insertion in model container [2019-11-06 18:47:03,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:47:03" (3/3) ... [2019-11-06 18:47:03,158 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_strcmp_ground.i [2019-11-06 18:47:03,174 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:47:03,184 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:47:03,212 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:47:03,260 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:47:03,260 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:47:03,261 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:47:03,261 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:47:03,261 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:47:03,261 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:47:03,261 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:47:03,261 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:47:03,280 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2019-11-06 18:47:03,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:47:03,286 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:03,286 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:03,288 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:03,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:03,292 INFO L82 PathProgramCache]: Analyzing trace with hash 893293776, now seen corresponding path program 1 times [2019-11-06 18:47:03,299 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:03,299 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599174860] [2019-11-06 18:47:03,300 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:03,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:03,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:03,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:03,499 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:47:03,499 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599174860] [2019-11-06 18:47:03,500 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:03,501 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:47:03,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075028141] [2019-11-06 18:47:03,506 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:47:03,506 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:03,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:47:03,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:47:03,521 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 3 states. [2019-11-06 18:47:03,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:03,630 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2019-11-06 18:47:03,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:47:03,631 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-11-06 18:47:03,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:03,638 INFO L225 Difference]: With dead ends: 56 [2019-11-06 18:47:03,639 INFO L226 Difference]: Without dead ends: 27 [2019-11-06 18:47:03,643 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:47:03,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-06 18:47:03,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-11-06 18:47:03,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 18:47:03,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-11-06 18:47:03,696 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 20 [2019-11-06 18:47:03,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:03,697 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-11-06 18:47:03,697 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:47:03,697 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-11-06 18:47:03,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:47:03,700 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:03,700 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:03,701 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:03,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:03,701 INFO L82 PathProgramCache]: Analyzing trace with hash -368321770, now seen corresponding path program 1 times [2019-11-06 18:47:03,702 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:03,702 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89140071] [2019-11-06 18:47:03,702 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:03,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:03,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:03,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:03,834 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:47:03,835 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89140071] [2019-11-06 18:47:03,835 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:03,835 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:47:03,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030531730] [2019-11-06 18:47:03,838 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:47:03,839 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:03,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:47:03,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:47:03,840 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 4 states. [2019-11-06 18:47:03,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:03,943 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2019-11-06 18:47:03,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:47:03,944 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-11-06 18:47:03,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:03,946 INFO L225 Difference]: With dead ends: 48 [2019-11-06 18:47:03,946 INFO L226 Difference]: Without dead ends: 29 [2019-11-06 18:47:03,948 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:47:03,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-06 18:47:03,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-11-06 18:47:03,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:47:03,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2019-11-06 18:47:03,964 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 20 [2019-11-06 18:47:03,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:03,964 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2019-11-06 18:47:03,964 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:47:03,965 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2019-11-06 18:47:03,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-06 18:47:03,968 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:03,968 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:03,968 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:03,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:03,970 INFO L82 PathProgramCache]: Analyzing trace with hash -967109544, now seen corresponding path program 1 times [2019-11-06 18:47:03,970 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:03,971 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909368804] [2019-11-06 18:47:03,971 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:04,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:47:04,061 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909368804] [2019-11-06 18:47:04,062 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:04,062 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:47:04,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829888357] [2019-11-06 18:47:04,063 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:47:04,063 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:04,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:47:04,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:47:04,064 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 4 states. [2019-11-06 18:47:04,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:04,178 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2019-11-06 18:47:04,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:47:04,180 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2019-11-06 18:47:04,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:04,184 INFO L225 Difference]: With dead ends: 47 [2019-11-06 18:47:04,184 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 18:47:04,185 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-06 18:47:04,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 18:47:04,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2019-11-06 18:47:04,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 18:47:04,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2019-11-06 18:47:04,199 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 22 [2019-11-06 18:47:04,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:04,199 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2019-11-06 18:47:04,200 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:47:04,200 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2019-11-06 18:47:04,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-06 18:47:04,201 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:04,201 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:04,202 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:04,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:04,203 INFO L82 PathProgramCache]: Analyzing trace with hash 716522559, now seen corresponding path program 1 times [2019-11-06 18:47:04,203 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:04,203 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555373260] [2019-11-06 18:47:04,204 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:04,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:47:04,356 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555373260] [2019-11-06 18:47:04,357 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:04,357 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 18:47:04,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144322165] [2019-11-06 18:47:04,358 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:47:04,358 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:04,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:47:04,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:47:04,359 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 6 states. [2019-11-06 18:47:04,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:04,496 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2019-11-06 18:47:04,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:47:04,497 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2019-11-06 18:47:04,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:04,498 INFO L225 Difference]: With dead ends: 43 [2019-11-06 18:47:04,498 INFO L226 Difference]: Without dead ends: 29 [2019-11-06 18:47:04,498 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:47:04,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-06 18:47:04,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-06 18:47:04,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 18:47:04,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-11-06 18:47:04,504 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2019-11-06 18:47:04,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:04,505 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-11-06 18:47:04,505 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:47:04,505 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-11-06 18:47:04,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 18:47:04,506 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:04,506 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:04,506 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:04,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:04,507 INFO L82 PathProgramCache]: Analyzing trace with hash 487231732, now seen corresponding path program 1 times [2019-11-06 18:47:04,507 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:04,507 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749991415] [2019-11-06 18:47:04,507 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:04,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:47:04,564 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749991415] [2019-11-06 18:47:04,564 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [944492302] [2019-11-06 18:47:04,564 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:04,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:04,635 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:47:04,642 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:04,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:47:04,682 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:04,682 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:47:04,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281204711] [2019-11-06 18:47:04,683 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:47:04,684 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:04,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:47:04,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:47:04,684 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2019-11-06 18:47:04,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:04,750 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2019-11-06 18:47:04,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:47:04,750 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2019-11-06 18:47:04,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:04,751 INFO L225 Difference]: With dead ends: 52 [2019-11-06 18:47:04,751 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 18:47:04,752 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:47:04,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 18:47:04,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-11-06 18:47:04,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 18:47:04,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2019-11-06 18:47:04,757 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 24 [2019-11-06 18:47:04,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:04,758 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2019-11-06 18:47:04,758 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:47:04,758 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2019-11-06 18:47:04,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-06 18:47:04,759 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:04,759 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:04,970 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:04,970 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:04,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:04,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1622628662, now seen corresponding path program 2 times [2019-11-06 18:47:04,971 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:04,972 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274575300] [2019-11-06 18:47:04,972 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:05,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:05,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:05,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:05,083 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 18:47:05,085 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274575300] [2019-11-06 18:47:05,085 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316158612] [2019-11-06 18:47:05,085 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:05,133 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:05,133 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:05,134 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:47:05,136 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:05,169 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:47:05,169 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:05,169 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-11-06 18:47:05,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456070714] [2019-11-06 18:47:05,173 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:47:05,173 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:05,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:47:05,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:47:05,174 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 8 states. [2019-11-06 18:47:05,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:05,313 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2019-11-06 18:47:05,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:47:05,313 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2019-11-06 18:47:05,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:05,314 INFO L225 Difference]: With dead ends: 57 [2019-11-06 18:47:05,315 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 18:47:05,315 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:47:05,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 18:47:05,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-11-06 18:47:05,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 18:47:05,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-11-06 18:47:05,322 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 26 [2019-11-06 18:47:05,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:05,322 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-11-06 18:47:05,322 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:47:05,323 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-11-06 18:47:05,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-06 18:47:05,323 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:05,324 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:05,527 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:05,527 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:05,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:05,528 INFO L82 PathProgramCache]: Analyzing trace with hash 622062996, now seen corresponding path program 3 times [2019-11-06 18:47:05,528 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:05,528 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140420347] [2019-11-06 18:47:05,529 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:05,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:05,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:05,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:05,644 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:47:05,644 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140420347] [2019-11-06 18:47:05,645 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287693926] [2019-11-06 18:47:05,645 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:05,707 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:47:05,707 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:05,708 INFO L256 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:47:05,714 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:05,734 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:47:05,735 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:05,735 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2019-11-06 18:47:05,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169183017] [2019-11-06 18:47:05,736 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:47:05,736 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:05,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:47:05,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:47:05,738 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 6 states. [2019-11-06 18:47:05,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:05,845 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2019-11-06 18:47:05,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:47:05,846 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2019-11-06 18:47:05,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:05,847 INFO L225 Difference]: With dead ends: 53 [2019-11-06 18:47:05,847 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 18:47:05,847 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:47:05,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 18:47:05,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-11-06 18:47:05,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-06 18:47:05,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2019-11-06 18:47:05,853 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 30 [2019-11-06 18:47:05,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:05,853 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2019-11-06 18:47:05,854 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:47:05,854 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2019-11-06 18:47:05,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 18:47:05,855 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:05,855 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:06,058 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:06,059 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:06,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:06,059 INFO L82 PathProgramCache]: Analyzing trace with hash -1326314704, now seen corresponding path program 4 times [2019-11-06 18:47:06,059 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:06,060 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618855590] [2019-11-06 18:47:06,060 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:06,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:06,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:06,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:06,164 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:47:06,164 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618855590] [2019-11-06 18:47:06,165 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163561200] [2019-11-06 18:47:06,165 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:06,228 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:47:06,228 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:06,229 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:47:06,236 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:06,303 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:47:06,303 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:06,305 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2019-11-06 18:47:06,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603965264] [2019-11-06 18:47:06,306 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:47:06,306 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:06,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:47:06,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:47:06,307 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 11 states. [2019-11-06 18:47:06,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:06,498 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2019-11-06 18:47:06,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:47:06,498 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2019-11-06 18:47:06,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:06,499 INFO L225 Difference]: With dead ends: 67 [2019-11-06 18:47:06,499 INFO L226 Difference]: Without dead ends: 43 [2019-11-06 18:47:06,500 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:47:06,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-06 18:47:06,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2019-11-06 18:47:06,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-06 18:47:06,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2019-11-06 18:47:06,505 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 32 [2019-11-06 18:47:06,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:06,506 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2019-11-06 18:47:06,506 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:47:06,506 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2019-11-06 18:47:06,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-06 18:47:06,507 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:06,507 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:06,721 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:06,722 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:06,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:06,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1762135950, now seen corresponding path program 5 times [2019-11-06 18:47:06,722 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:06,723 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745705237] [2019-11-06 18:47:06,723 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:06,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:06,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:06,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:06,851 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:47:06,851 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745705237] [2019-11-06 18:47:06,851 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056124437] [2019-11-06 18:47:06,852 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:06,941 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2019-11-06 18:47:06,942 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:06,943 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:47:06,945 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:06,952 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:47:06,952 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:06,952 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 8 [2019-11-06 18:47:06,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588351921] [2019-11-06 18:47:06,953 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:47:06,953 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:06,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:47:06,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:47:06,954 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2019-11-06 18:47:07,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:07,103 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2019-11-06 18:47:07,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:47:07,103 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2019-11-06 18:47:07,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:07,104 INFO L225 Difference]: With dead ends: 59 [2019-11-06 18:47:07,105 INFO L226 Difference]: Without dead ends: 44 [2019-11-06 18:47:07,106 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:47:07,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-06 18:47:07,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-11-06 18:47:07,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 18:47:07,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2019-11-06 18:47:07,113 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 36 [2019-11-06 18:47:07,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:07,113 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2019-11-06 18:47:07,113 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:47:07,113 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2019-11-06 18:47:07,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 18:47:07,114 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:07,115 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:07,325 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:07,326 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:07,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:07,327 INFO L82 PathProgramCache]: Analyzing trace with hash -932866390, now seen corresponding path program 6 times [2019-11-06 18:47:07,327 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:07,327 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488503886] [2019-11-06 18:47:07,328 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:07,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:07,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:07,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:07,442 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:47:07,443 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488503886] [2019-11-06 18:47:07,443 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290834684] [2019-11-06 18:47:07,443 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:07,506 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-11-06 18:47:07,506 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:07,508 INFO L256 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 43 conjunts are in the unsatisfiable core [2019-11-06 18:47:07,513 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:07,570 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 10 treesize of output 8 [2019-11-06 18:47:07,571 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:07,587 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:07,587 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:07,588 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2019-11-06 18:47:07,621 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 39 treesize of output 23 [2019-11-06 18:47:07,621 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:07,633 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:07,634 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:07,634 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:50, output treesize:11 [2019-11-06 18:47:07,724 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2019-11-06 18:47:07,725 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:07,729 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:07,729 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:07,730 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:30, output treesize:3 [2019-11-06 18:47:07,773 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-06 18:47:07,773 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:07,774 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 18 [2019-11-06 18:47:07,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504282135] [2019-11-06 18:47:07,774 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:47:07,775 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:07,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:47:07,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:47:07,775 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 18 states. [2019-11-06 18:47:08,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:08,305 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2019-11-06 18:47:08,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:47:08,306 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 38 [2019-11-06 18:47:08,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:08,307 INFO L225 Difference]: With dead ends: 69 [2019-11-06 18:47:08,307 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 18:47:08,308 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=149, Invalid=663, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:47:08,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 18:47:08,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 51. [2019-11-06 18:47:08,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 18:47:08,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2019-11-06 18:47:08,315 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 38 [2019-11-06 18:47:08,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:08,316 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2019-11-06 18:47:08,316 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:47:08,316 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2019-11-06 18:47:08,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 18:47:08,317 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:08,317 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:08,530 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:08,531 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:08,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:08,531 INFO L82 PathProgramCache]: Analyzing trace with hash 991549526, now seen corresponding path program 1 times [2019-11-06 18:47:08,532 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:08,532 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535803672] [2019-11-06 18:47:08,532 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:08,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:08,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:08,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:08,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:08,649 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-06 18:47:08,649 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535803672] [2019-11-06 18:47:08,649 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909967922] [2019-11-06 18:47:08,649 INFO L94 rtionOrderModulation]: Keeping assertion order 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 [2019-11-06 18:47:08,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:08,712 INFO L256 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:47:08,721 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:08,774 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-11-06 18:47:08,774 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:08,774 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 15 [2019-11-06 18:47:08,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904474976] [2019-11-06 18:47:08,775 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:47:08,775 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:08,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:47:08,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:47:08,776 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 15 states. [2019-11-06 18:47:09,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:09,048 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2019-11-06 18:47:09,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:47:09,048 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2019-11-06 18:47:09,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:09,049 INFO L225 Difference]: With dead ends: 93 [2019-11-06 18:47:09,049 INFO L226 Difference]: Without dead ends: 57 [2019-11-06 18:47:09,051 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=128, Invalid=334, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:47:09,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-11-06 18:47:09,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2019-11-06 18:47:09,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-06 18:47:09,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2019-11-06 18:47:09,059 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 48 [2019-11-06 18:47:09,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:09,059 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2019-11-06 18:47:09,059 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:47:09,059 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2019-11-06 18:47:09,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-06 18:47:09,060 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:09,061 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:09,274 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:09,274 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:09,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:09,275 INFO L82 PathProgramCache]: Analyzing trace with hash -2040352972, now seen corresponding path program 2 times [2019-11-06 18:47:09,275 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:09,275 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824586551] [2019-11-06 18:47:09,276 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:09,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:09,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:09,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:09,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:09,399 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-11-06 18:47:09,408 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824586551] [2019-11-06 18:47:09,408 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023852490] [2019-11-06 18:47:09,408 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:09,466 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:09,466 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:09,467 INFO L256 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:47:09,469 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:09,557 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2019-11-06 18:47:09,557 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:09,557 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2019-11-06 18:47:09,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932435456] [2019-11-06 18:47:09,561 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 18:47:09,562 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:09,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 18:47:09,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:47:09,562 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 17 states. [2019-11-06 18:47:09,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:09,815 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2019-11-06 18:47:09,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:47:09,815 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2019-11-06 18:47:09,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:09,816 INFO L225 Difference]: With dead ends: 99 [2019-11-06 18:47:09,816 INFO L226 Difference]: Without dead ends: 61 [2019-11-06 18:47:09,817 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=162, Invalid=438, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:47:09,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-11-06 18:47:09,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2019-11-06 18:47:09,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-11-06 18:47:09,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2019-11-06 18:47:09,824 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 52 [2019-11-06 18:47:09,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:09,825 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2019-11-06 18:47:09,825 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 18:47:09,825 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2019-11-06 18:47:09,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-06 18:47:09,826 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:09,826 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:10,037 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:10,038 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:10,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:10,038 INFO L82 PathProgramCache]: Analyzing trace with hash 290100626, now seen corresponding path program 3 times [2019-11-06 18:47:10,038 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:10,038 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486903085] [2019-11-06 18:47:10,039 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:10,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:10,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:10,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:10,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:10,174 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-11-06 18:47:10,175 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486903085] [2019-11-06 18:47:10,175 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914887014] [2019-11-06 18:47:10,175 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:10,271 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-06 18:47:10,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:10,273 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 52 conjunts are in the unsatisfiable core [2019-11-06 18:47:10,277 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:10,283 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 10 treesize of output 8 [2019-11-06 18:47:10,284 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:10,291 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:10,291 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:10,291 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2019-11-06 18:47:10,317 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 39 treesize of output 23 [2019-11-06 18:47:10,317 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:10,330 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:10,331 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:10,331 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:50, output treesize:11 [2019-11-06 18:47:12,513 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_main_~#a~0.base_BEFORE_CALL_3| Int) (|v_main_~#b~0.base_BEFORE_CALL_3| Int)) (and (not (= |v_main_~#b~0.base_BEFORE_CALL_3| |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select (select |c_#memory_int| |v_main_~#b~0.base_BEFORE_CALL_3|) 4) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_3|) 4)))) is different from true [2019-11-06 18:47:14,549 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 17 [2019-11-06 18:47:16,611 WARN L191 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 18 [2019-11-06 18:47:16,696 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2019-11-06 18:47:16,697 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:16,700 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:16,701 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:16,701 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:30, output treesize:3 [2019-11-06 18:47:18,782 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 1 not checked. [2019-11-06 18:47:18,782 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:18,783 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 26 [2019-11-06 18:47:18,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571940447] [2019-11-06 18:47:18,783 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-06 18:47:18,783 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:18,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-06 18:47:18,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=495, Unknown=2, NotChecked=46, Total=650 [2019-11-06 18:47:18,784 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 26 states. [2019-11-06 18:47:45,381 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 23 [2019-11-06 18:47:47,420 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 26 [2019-11-06 18:47:49,464 WARN L191 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 29