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_find_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:45:17,433 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:45:17,435 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:45:17,447 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:45:17,447 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:45:17,448 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:45:17,450 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:45:17,451 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:45:17,453 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:45:17,454 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:45:17,454 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:45:17,456 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:45:17,456 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:45:17,457 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:45:17,458 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:45:17,459 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:45:17,460 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:45:17,460 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:45:17,462 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:45:17,464 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:45:17,465 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:45:17,466 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:45:17,467 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:45:17,468 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:45:17,470 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 17:45:17,471 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 17:45:17,471 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 17:45:17,472 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 17:45:17,472 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 17:45:17,473 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 17:45:17,473 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:45:17,474 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:45:17,475 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:45:17,475 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:45:17,476 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:45:17,477 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:45:17,477 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:45:17,477 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:45:17,478 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:45:17,478 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:45:17,479 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:45:17,480 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-13 17:45:17,493 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:45:17,494 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:45:17,495 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:45:17,495 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:45:17,495 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:45:17,496 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:45:17,496 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:45:17,496 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:45:17,496 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:45:17,496 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:45:17,496 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:45:17,497 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:45:17,497 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:45:17,497 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:45:17,497 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:45:17,497 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:45:17,498 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:45:17,498 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:45:17,498 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:45:17,498 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:45:17,498 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:45:17,499 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:45:17,499 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:45:17,499 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:45:17,499 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:45:17,499 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:45:17,500 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:45:17,500 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:45:17,500 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:45:17,782 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:45:17,797 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:45:17,801 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:45:17,803 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:45:17,804 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:45:17,805 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-10-13 17:45:17,875 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae39e686b/3b8a71e184464c02a9d24d369481131e/FLAG8f1f737b9 [2019-10-13 17:45:18,287 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:45:18,288 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-10-13 17:45:18,294 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae39e686b/3b8a71e184464c02a9d24d369481131e/FLAG8f1f737b9 [2019-10-13 17:45:18,655 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae39e686b/3b8a71e184464c02a9d24d369481131e [2019-10-13 17:45:18,664 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:45:18,666 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:45:18,667 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:45:18,667 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:45:18,673 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:45:18,674 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:45:18" (1/1) ... [2019-10-13 17:45:18,676 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5336899d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18, skipping insertion in model container [2019-10-13 17:45:18,676 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:45:18" (1/1) ... [2019-10-13 17:45:18,683 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:45:18,700 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:45:18,885 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:45:18,888 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:45:18,906 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:45:18,924 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:45:18,925 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18 WrapperNode [2019-10-13 17:45:18,925 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:45:18,926 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:45:18,926 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:45:18,926 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:45:19,024 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18" (1/1) ... [2019-10-13 17:45:19,024 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18" (1/1) ... [2019-10-13 17:45:19,030 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18" (1/1) ... [2019-10-13 17:45:19,031 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18" (1/1) ... [2019-10-13 17:45:19,037 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18" (1/1) ... [2019-10-13 17:45:19,042 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18" (1/1) ... [2019-10-13 17:45:19,043 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18" (1/1) ... [2019-10-13 17:45:19,045 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:45:19,046 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:45:19,046 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:45:19,046 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:45:19,047 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:45:19,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:45:19,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:45:19,102 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 17:45:19,102 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:45:19,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:45:19,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 17:45:19,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 17:45:19,103 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:45:19,103 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-13 17:45:19,103 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 17:45:19,103 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 17:45:19,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 17:45:19,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:45:19,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:45:19,360 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:45:19,361 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-13 17:45:19,362 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:45:19 BoogieIcfgContainer [2019-10-13 17:45:19,362 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:45:19,363 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:45:19,364 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:45:19,366 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:45:19,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:45:18" (1/3) ... [2019-10-13 17:45:19,367 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@191607ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:45:19, skipping insertion in model container [2019-10-13 17:45:19,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:18" (2/3) ... [2019-10-13 17:45:19,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@191607ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:45:19, skipping insertion in model container [2019-10-13 17:45:19,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:45:19" (3/3) ... [2019-10-13 17:45:19,370 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_find_ground-1.i [2019-10-13 17:45:19,381 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:45:19,388 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:45:19,399 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:45:19,438 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:45:19,439 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:45:19,439 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:45:19,439 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:45:19,439 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:45:19,439 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:45:19,439 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:45:19,440 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:45:19,460 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-13 17:45:19,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-13 17:45:19,467 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:19,468 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:19,470 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:19,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:19,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1063635089, now seen corresponding path program 1 times [2019-10-13 17:45:19,483 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:19,484 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353343476] [2019-10-13 17:45:19,484 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,484 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,484 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:19,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,652 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:45:19,653 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353343476] [2019-10-13 17:45:19,654 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:45:19,654 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 17:45:19,654 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043110389] [2019-10-13 17:45:19,658 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 17:45:19,659 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:19,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 17:45:19,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:45:19,675 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-10-13 17:45:19,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:19,776 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2019-10-13 17:45:19,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 17:45:19,778 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-13 17:45:19,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:19,785 INFO L225 Difference]: With dead ends: 46 [2019-10-13 17:45:19,786 INFO L226 Difference]: Without dead ends: 22 [2019-10-13 17:45:19,788 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:45:19,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-13 17:45:19,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-13 17:45:19,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-13 17:45:19,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-10-13 17:45:19,831 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2019-10-13 17:45:19,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:19,832 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-10-13 17:45:19,832 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 17:45:19,832 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-10-13 17:45:19,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-13 17:45:19,833 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:19,833 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:19,834 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:19,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:19,834 INFO L82 PathProgramCache]: Analyzing trace with hash -977598642, now seen corresponding path program 1 times [2019-10-13 17:45:19,835 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:19,835 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271890940] [2019-10-13 17:45:19,835 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,836 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,836 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:19,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:45:19,918 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271890940] [2019-10-13 17:45:19,918 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:45:19,919 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:45:19,919 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231678116] [2019-10-13 17:45:19,921 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:45:19,921 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:19,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:45:19,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:45:19,924 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 4 states. [2019-10-13 17:45:19,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:20,000 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2019-10-13 17:45:20,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:45:20,001 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-10-13 17:45:20,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:20,002 INFO L225 Difference]: With dead ends: 38 [2019-10-13 17:45:20,002 INFO L226 Difference]: Without dead ends: 24 [2019-10-13 17:45:20,003 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:45:20,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-13 17:45:20,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-10-13 17:45:20,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-13 17:45:20,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2019-10-13 17:45:20,016 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 16 [2019-10-13 17:45:20,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:20,016 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2019-10-13 17:45:20,017 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:45:20,017 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2019-10-13 17:45:20,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-13 17:45:20,018 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:20,019 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:20,020 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:20,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:20,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1311771152, now seen corresponding path program 1 times [2019-10-13 17:45:20,022 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:20,022 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113880632] [2019-10-13 17:45:20,022 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,022 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,023 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:20,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,150 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:45:20,150 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113880632] [2019-10-13 17:45:20,151 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:45:20,151 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-13 17:45:20,151 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445442854] [2019-10-13 17:45:20,152 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-13 17:45:20,152 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:20,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-13 17:45:20,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-13 17:45:20,155 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 5 states. [2019-10-13 17:45:20,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:20,227 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2019-10-13 17:45:20,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 17:45:20,229 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2019-10-13 17:45:20,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:20,230 INFO L225 Difference]: With dead ends: 38 [2019-10-13 17:45:20,230 INFO L226 Difference]: Without dead ends: 26 [2019-10-13 17:45:20,231 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-13 17:45:20,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-13 17:45:20,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-13 17:45:20,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-13 17:45:20,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2019-10-13 17:45:20,241 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 18 [2019-10-13 17:45:20,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:20,241 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2019-10-13 17:45:20,242 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-13 17:45:20,242 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2019-10-13 17:45:20,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-13 17:45:20,243 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:20,243 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:20,244 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:20,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:20,244 INFO L82 PathProgramCache]: Analyzing trace with hash 605671840, now seen corresponding path program 1 times [2019-10-13 17:45:20,244 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:20,245 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309788603] [2019-10-13 17:45:20,246 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,246 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,246 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:20,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,358 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-13 17:45:20,358 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309788603] [2019-10-13 17:45:20,359 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1944826781] [2019-10-13 17:45:20,359 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:20,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,423 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:45:20,432 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:20,471 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-13 17:45:20,472 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:20,472 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-13 17:45:20,472 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943069427] [2019-10-13 17:45:20,473 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:45:20,473 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:20,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:45:20,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:45:20,474 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 6 states. [2019-10-13 17:45:20,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:20,553 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-10-13 17:45:20,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 17:45:20,553 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2019-10-13 17:45:20,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:20,554 INFO L225 Difference]: With dead ends: 46 [2019-10-13 17:45:20,554 INFO L226 Difference]: Without dead ends: 29 [2019-10-13 17:45:20,555 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:45:20,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-13 17:45:20,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-10-13 17:45:20,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-13 17:45:20,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2019-10-13 17:45:20,561 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 21 [2019-10-13 17:45:20,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:20,562 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2019-10-13 17:45:20,562 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:45:20,562 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2019-10-13 17:45:20,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-13 17:45:20,563 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:20,563 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:20,766 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:20,767 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:20,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:20,768 INFO L82 PathProgramCache]: Analyzing trace with hash -631588802, now seen corresponding path program 2 times [2019-10-13 17:45:20,769 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:20,769 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139779406] [2019-10-13 17:45:20,770 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,770 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,770 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:20,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,839 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-13 17:45:20,839 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139779406] [2019-10-13 17:45:20,840 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450626226] [2019-10-13 17:45:20,840 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 [2019-10-13 17:45:20,891 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:20,892 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:20,893 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:45:20,894 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:20,906 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-13 17:45:20,907 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:20,907 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-13 17:45:20,907 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80962331] [2019-10-13 17:45:20,908 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-13 17:45:20,908 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:20,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-13 17:45:20,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:45:20,909 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 7 states. [2019-10-13 17:45:20,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:20,975 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2019-10-13 17:45:20,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:45:20,978 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-10-13 17:45:20,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:20,978 INFO L225 Difference]: With dead ends: 48 [2019-10-13 17:45:20,979 INFO L226 Difference]: Without dead ends: 31 [2019-10-13 17:45:20,979 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:45:20,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-13 17:45:20,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-10-13 17:45:20,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-13 17:45:20,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2019-10-13 17:45:20,985 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 23 [2019-10-13 17:45:20,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:20,985 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2019-10-13 17:45:20,986 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-13 17:45:20,986 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2019-10-13 17:45:20,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-13 17:45:20,987 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:20,987 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:21,191 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:21,191 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:21,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:21,192 INFO L82 PathProgramCache]: Analyzing trace with hash 66875228, now seen corresponding path program 3 times [2019-10-13 17:45:21,192 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:21,192 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675918396] [2019-10-13 17:45:21,192 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:21,192 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:21,193 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:21,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:21,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:21,309 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-13 17:45:21,309 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675918396] [2019-10-13 17:45:21,310 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855579380] [2019-10-13 17:45:21,310 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:21,359 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-13 17:45:21,359 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:21,360 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-13 17:45:21,362 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:21,490 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-13 17:45:21,493 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:45:21,499 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:21,499 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:45:21,499 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-13 17:45:21,541 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:45:21,618 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:45:21,619 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:21,620 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 14 [2019-10-13 17:45:21,620 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533838123] [2019-10-13 17:45:21,621 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:45:21,621 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:21,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:45:21,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:45:21,622 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 14 states. [2019-10-13 17:45:22,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:22,020 INFO L93 Difference]: Finished difference Result 67 states and 79 transitions. [2019-10-13 17:45:22,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 17:45:22,021 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 25 [2019-10-13 17:45:22,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:22,024 INFO L225 Difference]: With dead ends: 67 [2019-10-13 17:45:22,024 INFO L226 Difference]: Without dead ends: 50 [2019-10-13 17:45:22,027 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2019-10-13 17:45:22,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-13 17:45:22,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2019-10-13 17:45:22,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-13 17:45:22,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2019-10-13 17:45:22,055 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 25 [2019-10-13 17:45:22,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:22,056 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2019-10-13 17:45:22,056 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:45:22,056 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2019-10-13 17:45:22,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-13 17:45:22,057 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:22,057 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:22,261 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:22,269 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:22,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:22,270 INFO L82 PathProgramCache]: Analyzing trace with hash 1976974460, now seen corresponding path program 1 times [2019-10-13 17:45:22,270 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:22,270 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024290268] [2019-10-13 17:45:22,270 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,270 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,271 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:22,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,316 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:45:22,316 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024290268] [2019-10-13 17:45:22,317 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:45:22,317 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:45:22,317 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975704015] [2019-10-13 17:45:22,317 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:45:22,318 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:22,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:45:22,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:45:22,319 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 4 states. [2019-10-13 17:45:22,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:22,361 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2019-10-13 17:45:22,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:45:22,361 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 27 [2019-10-13 17:45:22,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:22,364 INFO L225 Difference]: With dead ends: 64 [2019-10-13 17:45:22,364 INFO L226 Difference]: Without dead ends: 39 [2019-10-13 17:45:22,365 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:45:22,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-13 17:45:22,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-10-13 17:45:22,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-13 17:45:22,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2019-10-13 17:45:22,387 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 27 [2019-10-13 17:45:22,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:22,388 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2019-10-13 17:45:22,388 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:45:22,388 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2019-10-13 17:45:22,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-13 17:45:22,389 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:22,389 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:22,390 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:22,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:22,390 INFO L82 PathProgramCache]: Analyzing trace with hash 107032625, now seen corresponding path program 1 times [2019-10-13 17:45:22,390 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:22,391 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340345992] [2019-10-13 17:45:22,391 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,391 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,391 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:22,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,499 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:45:22,500 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340345992] [2019-10-13 17:45:22,500 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1004943673] [2019-10-13 17:45:22,500 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:22,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,541 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:45:22,544 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:22,596 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-13 17:45:22,596 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:22,596 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2019-10-13 17:45:22,596 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994967927] [2019-10-13 17:45:22,597 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 17:45:22,597 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:22,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 17:45:22,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:45:22,598 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 12 states. [2019-10-13 17:45:22,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:22,781 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2019-10-13 17:45:22,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 17:45:22,781 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2019-10-13 17:45:22,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:22,782 INFO L225 Difference]: With dead ends: 76 [2019-10-13 17:45:22,783 INFO L226 Difference]: Without dead ends: 45 [2019-10-13 17:45:22,783 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:45:22,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-13 17:45:22,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2019-10-13 17:45:22,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-13 17:45:22,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2019-10-13 17:45:22,790 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 35 [2019-10-13 17:45:22,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:22,790 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2019-10-13 17:45:22,790 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 17:45:22,790 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2019-10-13 17:45:22,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-10-13 17:45:22,791 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:22,791 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:22,992 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:22,992 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:22,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:22,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1471316655, now seen corresponding path program 2 times [2019-10-13 17:45:22,993 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:22,994 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394640727] [2019-10-13 17:45:22,994 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,994 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,995 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:23,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:23,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:23,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:23,101 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-10-13 17:45:23,102 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394640727] [2019-10-13 17:45:23,102 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249677921] [2019-10-13 17:45:23,102 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:23,156 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:23,156 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:23,157 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 17:45:23,161 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:23,197 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-10-13 17:45:23,198 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:23,198 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-13 17:45:23,198 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753795930] [2019-10-13 17:45:23,199 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-13 17:45:23,199 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:23,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-13 17:45:23,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-13 17:45:23,199 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 10 states. [2019-10-13 17:45:23,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:23,291 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2019-10-13 17:45:23,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-13 17:45:23,291 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2019-10-13 17:45:23,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:23,292 INFO L225 Difference]: With dead ends: 74 [2019-10-13 17:45:23,292 INFO L226 Difference]: Without dead ends: 47 [2019-10-13 17:45:23,293 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-13 17:45:23,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-13 17:45:23,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-10-13 17:45:23,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-13 17:45:23,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-10-13 17:45:23,299 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 40 [2019-10-13 17:45:23,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:23,299 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-10-13 17:45:23,300 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-13 17:45:23,300 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-10-13 17:45:23,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-13 17:45:23,301 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:23,301 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:23,505 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:23,505 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:23,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:23,506 INFO L82 PathProgramCache]: Analyzing trace with hash -705811631, now seen corresponding path program 3 times [2019-10-13 17:45:23,506 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:23,506 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645249794] [2019-10-13 17:45:23,506 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:23,506 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:23,506 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:23,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:23,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:23,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:23,612 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-10-13 17:45:23,612 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645249794] [2019-10-13 17:45:23,613 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879294221] [2019-10-13 17:45:23,613 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:23,655 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-13 17:45:23,656 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:23,657 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-13 17:45:23,663 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:23,797 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-13 17:45:23,798 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:45:23,802 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:23,802 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:45:23,802 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-13 17:45:23,814 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:45:23,843 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:45:23,843 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:23,843 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2019-10-13 17:45:23,844 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602789217] [2019-10-13 17:45:23,844 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-13 17:45:23,844 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:23,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-13 17:45:23,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:45:23,845 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 19 states. [2019-10-13 17:45:24,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:24,357 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2019-10-13 17:45:24,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-13 17:45:24,358 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2019-10-13 17:45:24,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:24,358 INFO L225 Difference]: With dead ends: 86 [2019-10-13 17:45:24,359 INFO L226 Difference]: Without dead ends: 59 [2019-10-13 17:45:24,359 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:45:24,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-13 17:45:24,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2019-10-13 17:45:24,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-13 17:45:24,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2019-10-13 17:45:24,366 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 42 [2019-10-13 17:45:24,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:24,366 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2019-10-13 17:45:24,367 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-13 17:45:24,367 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2019-10-13 17:45:24,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-13 17:45:24,368 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:24,368 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:24,569 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:24,570 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:24,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:24,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1970471850, now seen corresponding path program 4 times [2019-10-13 17:45:24,572 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:24,573 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243045113] [2019-10-13 17:45:24,573 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:24,573 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:24,573 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:24,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:24,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:24,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:24,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:24,696 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 4 proven. 49 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-13 17:45:24,697 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243045113] [2019-10-13 17:45:24,697 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1919324217] [2019-10-13 17:45:24,697 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:24,780 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:45:24,780 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:24,781 INFO L256 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 17:45:24,784 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:24,810 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:45:24,811 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:24,811 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-13 17:45:24,811 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154858934] [2019-10-13 17:45:24,812 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 17:45:24,812 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:24,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 17:45:24,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:45:24,814 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand 12 states. [2019-10-13 17:45:24,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:24,891 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2019-10-13 17:45:24,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-13 17:45:24,891 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2019-10-13 17:45:24,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:24,892 INFO L225 Difference]: With dead ends: 94 [2019-10-13 17:45:24,892 INFO L226 Difference]: Without dead ends: 59 [2019-10-13 17:45:24,893 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:45:24,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-13 17:45:24,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-10-13 17:45:24,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-13 17:45:24,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2019-10-13 17:45:24,900 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 52 [2019-10-13 17:45:24,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:24,900 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2019-10-13 17:45:24,900 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 17:45:24,900 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2019-10-13 17:45:24,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-13 17:45:24,901 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:24,901 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:25,105 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:25,106 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:25,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:25,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1583139148, now seen corresponding path program 5 times [2019-10-13 17:45:25,107 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:25,107 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549705453] [2019-10-13 17:45:25,107 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:25,107 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:25,108 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:25,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:25,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:25,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:25,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:25,216 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 4 proven. 64 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-13 17:45:25,216 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549705453] [2019-10-13 17:45:25,216 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694778589] [2019-10-13 17:45:25,216 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 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 [2019-10-13 17:45:25,292 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2019-10-13 17:45:25,292 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:25,294 INFO L256 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:45:25,296 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:25,312 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:45:25,313 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:25,313 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-13 17:45:25,313 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206783386] [2019-10-13 17:45:25,313 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-13 17:45:25,314 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:25,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-13 17:45:25,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:45:25,314 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 13 states. [2019-10-13 17:45:25,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:25,391 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2019-10-13 17:45:25,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 17:45:25,391 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2019-10-13 17:45:25,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:25,392 INFO L225 Difference]: With dead ends: 96 [2019-10-13 17:45:25,393 INFO L226 Difference]: Without dead ends: 61 [2019-10-13 17:45:25,394 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:45:25,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-13 17:45:25,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2019-10-13 17:45:25,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-13 17:45:25,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2019-10-13 17:45:25,401 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 54 [2019-10-13 17:45:25,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:25,402 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2019-10-13 17:45:25,402 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-13 17:45:25,402 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2019-10-13 17:45:25,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-10-13 17:45:25,403 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:25,403 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:25,606 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:25,607 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:25,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:25,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1276400018, now seen corresponding path program 6 times [2019-10-13 17:45:25,608 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:25,608 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389580602] [2019-10-13 17:45:25,609 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:25,609 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:25,609 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:25,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:25,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:25,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:25,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:25,726 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 4 proven. 81 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-13 17:45:25,726 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389580602] [2019-10-13 17:45:25,726 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905436397] [2019-10-13 17:45:25,726 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 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 [2019-10-13 17:45:25,778 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-10-13 17:45:25,779 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:25,779 INFO L256 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 17:45:25,782 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:25,870 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2019-10-13 17:45:25,871 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:25,871 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 19 [2019-10-13 17:45:25,871 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627550056] [2019-10-13 17:45:25,872 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-13 17:45:25,872 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:25,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-13 17:45:25,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=253, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:45:25,873 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand 19 states. [2019-10-13 17:45:26,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:26,150 INFO L93 Difference]: Finished difference Result 112 states and 122 transitions. [2019-10-13 17:45:26,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-13 17:45:26,150 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 56 [2019-10-13 17:45:26,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:26,151 INFO L225 Difference]: With dead ends: 112 [2019-10-13 17:45:26,151 INFO L226 Difference]: Without dead ends: 66 [2019-10-13 17:45:26,152 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2019-10-13 17:45:26,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-13 17:45:26,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-10-13 17:45:26,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-10-13 17:45:26,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2019-10-13 17:45:26,158 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 56 [2019-10-13 17:45:26,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:26,158 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2019-10-13 17:45:26,158 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-13 17:45:26,158 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2019-10-13 17:45:26,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-10-13 17:45:26,159 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:26,160 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:26,368 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:26,369 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:26,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:26,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1488985628, now seen corresponding path program 7 times [2019-10-13 17:45:26,369 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:26,369 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688439682] [2019-10-13 17:45:26,370 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:26,370 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:26,370 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:26,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:26,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:26,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:26,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:26,523 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 4 proven. 100 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 17:45:26,523 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688439682] [2019-10-13 17:45:26,524 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247181403] [2019-10-13 17:45:26,524 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:26,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:26,569 INFO L256 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:45:26,572 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:26,594 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-13 17:45:26,594 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:26,594 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-13 17:45:26,594 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271996744] [2019-10-13 17:45:26,595 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-13 17:45:26,595 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:26,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-13 17:45:26,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:45:26,596 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 15 states. [2019-10-13 17:45:26,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:26,691 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2019-10-13 17:45:26,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 17:45:26,691 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 61 [2019-10-13 17:45:26,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:26,692 INFO L225 Difference]: With dead ends: 106 [2019-10-13 17:45:26,692 INFO L226 Difference]: Without dead ends: 68 [2019-10-13 17:45:26,693 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:45:26,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-13 17:45:26,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-10-13 17:45:26,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-13 17:45:26,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-10-13 17:45:26,699 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 61 [2019-10-13 17:45:26,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:26,699 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-10-13 17:45:26,699 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-13 17:45:26,699 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-10-13 17:45:26,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-13 17:45:26,700 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:26,700 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:26,901 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:26,902 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:26,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:26,902 INFO L82 PathProgramCache]: Analyzing trace with hash -2139255110, now seen corresponding path program 8 times [2019-10-13 17:45:26,903 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:26,903 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68040003] [2019-10-13 17:45:26,904 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:26,904 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:26,904 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:26,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:27,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:27,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:27,054 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 4 proven. 121 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 17:45:27,055 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68040003] [2019-10-13 17:45:27,055 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915800078] [2019-10-13 17:45:27,055 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:27,118 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:27,118 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:27,119 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 17:45:27,122 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:27,139 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-13 17:45:27,139 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:27,140 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-13 17:45:27,140 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850468793] [2019-10-13 17:45:27,141 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-13 17:45:27,141 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:27,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-13 17:45:27,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:45:27,142 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 16 states. [2019-10-13 17:45:27,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:27,255 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2019-10-13 17:45:27,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 17:45:27,256 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2019-10-13 17:45:27,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:27,257 INFO L225 Difference]: With dead ends: 108 [2019-10-13 17:45:27,257 INFO L226 Difference]: Without dead ends: 70 [2019-10-13 17:45:27,258 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:45:27,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-13 17:45:27,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2019-10-13 17:45:27,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-10-13 17:45:27,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2019-10-13 17:45:27,264 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 63 [2019-10-13 17:45:27,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:27,264 INFO L462 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2019-10-13 17:45:27,264 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-13 17:45:27,264 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2019-10-13 17:45:27,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-13 17:45:27,265 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:27,265 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:27,469 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:27,469 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:27,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:27,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1365159976, now seen corresponding path program 9 times [2019-10-13 17:45:27,470 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:27,470 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574269287] [2019-10-13 17:45:27,470 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:27,470 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:27,471 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:27,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:27,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:27,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:27,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:27,681 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 4 proven. 144 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 17:45:27,681 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574269287] [2019-10-13 17:45:27,681 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567433841] [2019-10-13 17:45:27,681 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:27,773 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-13 17:45:27,773 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:27,774 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-13 17:45:27,778 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:28,039 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-13 17:45:28,041 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:28,042 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2019-10-13 17:45:28,042 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:45:28,049 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:28,050 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:45:28,050 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:29, output treesize:4 [2019-10-13 17:45:28,071 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:45:28,122 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2019-10-13 17:45:28,123 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:28,123 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2019-10-13 17:45:28,124 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089908782] [2019-10-13 17:45:28,125 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-13 17:45:28,125 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:28,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-13 17:45:28,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=563, Unknown=0, NotChecked=0, Total=702 [2019-10-13 17:45:28,127 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 27 states. [2019-10-13 17:45:29,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:29,072 INFO L93 Difference]: Finished difference Result 131 states and 142 transitions. [2019-10-13 17:45:29,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-13 17:45:29,072 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 65 [2019-10-13 17:45:29,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:29,074 INFO L225 Difference]: With dead ends: 131 [2019-10-13 17:45:29,074 INFO L226 Difference]: Without dead ends: 75 [2019-10-13 17:45:29,076 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=421, Invalid=1835, Unknown=0, NotChecked=0, Total=2256 [2019-10-13 17:45:29,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-10-13 17:45:29,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2019-10-13 17:45:29,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-10-13 17:45:29,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2019-10-13 17:45:29,082 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 65 [2019-10-13 17:45:29,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:29,082 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2019-10-13 17:45:29,083 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-13 17:45:29,083 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2019-10-13 17:45:29,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-10-13 17:45:29,084 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:29,084 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:29,287 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:29,287 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:29,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:29,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1988906486, now seen corresponding path program 10 times [2019-10-13 17:45:29,288 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:29,289 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939550374] [2019-10-13 17:45:29,289 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:29,289 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:29,289 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:29,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:29,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:29,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:29,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:29,439 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 4 proven. 169 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-13 17:45:29,439 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939550374] [2019-10-13 17:45:29,439 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261216301] [2019-10-13 17:45:29,440 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:29,498 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:45:29,498 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:29,499 INFO L256 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 17:45:29,505 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:29,543 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-13 17:45:29,543 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:29,544 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-13 17:45:29,544 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019412277] [2019-10-13 17:45:29,544 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-13 17:45:29,544 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:29,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-13 17:45:29,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:45:29,545 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand 18 states. [2019-10-13 17:45:29,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:29,631 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2019-10-13 17:45:29,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 17:45:29,632 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 70 [2019-10-13 17:45:29,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:29,633 INFO L225 Difference]: With dead ends: 118 [2019-10-13 17:45:29,633 INFO L226 Difference]: Without dead ends: 77 [2019-10-13 17:45:29,634 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:45:29,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-10-13 17:45:29,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-10-13 17:45:29,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-13 17:45:29,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2019-10-13 17:45:29,639 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 70 [2019-10-13 17:45:29,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:29,640 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2019-10-13 17:45:29,640 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-13 17:45:29,640 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2019-10-13 17:45:29,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-10-13 17:45:29,641 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:29,641 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:29,844 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:29,845 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:29,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:29,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1707036904, now seen corresponding path program 11 times [2019-10-13 17:45:29,845 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:29,845 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346592937] [2019-10-13 17:45:29,846 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:29,846 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:29,846 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:29,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:30,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:30,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:30,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:30,033 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 4 proven. 196 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-13 17:45:30,033 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346592937] [2019-10-13 17:45:30,033 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530071946] [2019-10-13 17:45:30,033 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:30,176 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 15 check-sat command(s) [2019-10-13 17:45:30,176 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:30,178 INFO L256 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-13 17:45:30,180 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:30,209 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-13 17:45:30,209 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:30,209 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-13 17:45:30,209 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462476532] [2019-10-13 17:45:30,210 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-13 17:45:30,210 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:30,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-13 17:45:30,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:45:30,211 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand 19 states. [2019-10-13 17:45:30,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:30,340 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2019-10-13 17:45:30,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-13 17:45:30,341 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 72 [2019-10-13 17:45:30,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:30,342 INFO L225 Difference]: With dead ends: 120 [2019-10-13 17:45:30,342 INFO L226 Difference]: Without dead ends: 79 [2019-10-13 17:45:30,343 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:45:30,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-13 17:45:30,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2019-10-13 17:45:30,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-10-13 17:45:30,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2019-10-13 17:45:30,348 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 72 [2019-10-13 17:45:30,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:30,348 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2019-10-13 17:45:30,348 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-13 17:45:30,348 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2019-10-13 17:45:30,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-10-13 17:45:30,349 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:30,349 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:30,553 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:30,553 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:30,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:30,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1570680902, now seen corresponding path program 12 times [2019-10-13 17:45:30,554 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:30,554 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451221388] [2019-10-13 17:45:30,555 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:30,555 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:30,555 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:30,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:30,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:30,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:30,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:30,732 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 4 proven. 225 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-13 17:45:30,733 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451221388] [2019-10-13 17:45:30,733 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714715470] [2019-10-13 17:45:30,733 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:30,815 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2019-10-13 17:45:30,815 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:30,816 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-13 17:45:30,819 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:30,997 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-13 17:45:30,998 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:45:30,999 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:30,999 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:45:30,999 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-13 17:45:31,016 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:45:31,056 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 232 trivial. 0 not checked. [2019-10-13 17:45:31,056 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:31,056 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 13] total 30 [2019-10-13 17:45:31,057 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403989257] [2019-10-13 17:45:31,057 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-13 17:45:31,057 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:31,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-13 17:45:31,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=690, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:45:31,058 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand 30 states. [2019-10-13 17:45:32,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:32,111 INFO L93 Difference]: Finished difference Result 132 states and 139 transitions. [2019-10-13 17:45:32,112 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-13 17:45:32,112 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2019-10-13 17:45:32,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:32,113 INFO L225 Difference]: With dead ends: 132 [2019-10-13 17:45:32,113 INFO L226 Difference]: Without dead ends: 91 [2019-10-13 17:45:32,114 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=503, Invalid=1947, Unknown=0, NotChecked=0, Total=2450 [2019-10-13 17:45:32,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-10-13 17:45:32,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2019-10-13 17:45:32,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-13 17:45:32,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2019-10-13 17:45:32,119 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 74 [2019-10-13 17:45:32,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:32,120 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2019-10-13 17:45:32,120 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-13 17:45:32,120 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2019-10-13 17:45:32,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-10-13 17:45:32,120 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:32,121 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:32,321 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:32,322 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:32,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:32,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1734170861, now seen corresponding path program 13 times [2019-10-13 17:45:32,323 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:32,323 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204654923] [2019-10-13 17:45:32,323 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:32,323 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:32,324 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:32,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:32,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:32,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:32,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:32,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:32,512 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 6 proven. 256 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-13 17:45:32,513 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204654923] [2019-10-13 17:45:32,513 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188329724] [2019-10-13 17:45:32,513 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:32,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:32,580 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-13 17:45:32,582 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:32,597 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-13 17:45:32,597 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:32,597 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-13 17:45:32,597 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713833843] [2019-10-13 17:45:32,598 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-13 17:45:32,598 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:32,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-13 17:45:32,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:45:32,599 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand 21 states. [2019-10-13 17:45:32,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:32,715 INFO L93 Difference]: Finished difference Result 140 states and 146 transitions. [2019-10-13 17:45:32,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-13 17:45:32,716 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 84 [2019-10-13 17:45:32,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:32,717 INFO L225 Difference]: With dead ends: 140 [2019-10-13 17:45:32,718 INFO L226 Difference]: Without dead ends: 91 [2019-10-13 17:45:32,718 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:45:32,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-10-13 17:45:32,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2019-10-13 17:45:32,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2019-10-13 17:45:32,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 93 transitions. [2019-10-13 17:45:32,724 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 93 transitions. Word has length 84 [2019-10-13 17:45:32,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:32,725 INFO L462 AbstractCegarLoop]: Abstraction has 90 states and 93 transitions. [2019-10-13 17:45:32,725 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-13 17:45:32,725 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 93 transitions. [2019-10-13 17:45:32,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-10-13 17:45:32,726 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:32,726 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:32,929 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:32,930 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:32,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:32,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1136485557, now seen corresponding path program 14 times [2019-10-13 17:45:32,930 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:32,930 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483759112] [2019-10-13 17:45:32,930 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:32,930 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:32,930 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:32,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,148 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 6 proven. 289 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-13 17:45:33,149 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483759112] [2019-10-13 17:45:33,149 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498227477] [2019-10-13 17:45:33,149 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:33,222 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:33,222 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:33,223 INFO L256 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-13 17:45:33,224 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:33,241 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-13 17:45:33,241 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:33,242 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-13 17:45:33,242 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461225935] [2019-10-13 17:45:33,242 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-13 17:45:33,242 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:33,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-13 17:45:33,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-13 17:45:33,243 INFO L87 Difference]: Start difference. First operand 90 states and 93 transitions. Second operand 22 states. [2019-10-13 17:45:33,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:33,378 INFO L93 Difference]: Finished difference Result 142 states and 148 transitions. [2019-10-13 17:45:33,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-13 17:45:33,379 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 86 [2019-10-13 17:45:33,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:33,379 INFO L225 Difference]: With dead ends: 142 [2019-10-13 17:45:33,380 INFO L226 Difference]: Without dead ends: 93 [2019-10-13 17:45:33,380 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-13 17:45:33,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-10-13 17:45:33,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2019-10-13 17:45:33,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-13 17:45:33,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 95 transitions. [2019-10-13 17:45:33,386 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 95 transitions. Word has length 86 [2019-10-13 17:45:33,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:33,386 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 95 transitions. [2019-10-13 17:45:33,386 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-13 17:45:33,387 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 95 transitions. [2019-10-13 17:45:33,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-10-13 17:45:33,387 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:33,388 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:33,591 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:33,591 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:33,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:33,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1826668073, now seen corresponding path program 15 times [2019-10-13 17:45:33,592 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:33,592 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729339491] [2019-10-13 17:45:33,593 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:33,593 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:33,593 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:33,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:33,833 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 6 proven. 324 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-13 17:45:33,833 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729339491] [2019-10-13 17:45:33,833 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901090764] [2019-10-13 17:45:33,833 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:33,897 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-13 17:45:33,898 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:33,898 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-13 17:45:33,900 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:34,219 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-13 17:45:34,221 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:34,221 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2019-10-13 17:45:34,222 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:45:34,228 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:34,229 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:45:34,229 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:29, output treesize:4 [2019-10-13 17:45:34,245 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:45:34,295 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 21 proven. 33 refuted. 0 times theorem prover too weak. 336 trivial. 0 not checked. [2019-10-13 17:45:34,295 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:34,296 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 15] total 35 [2019-10-13 17:45:34,296 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490591522] [2019-10-13 17:45:34,296 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-13 17:45:34,296 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:34,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-13 17:45:34,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=935, Unknown=0, NotChecked=0, Total=1190 [2019-10-13 17:45:34,297 INFO L87 Difference]: Start difference. First operand 92 states and 95 transitions. Second operand 35 states. [2019-10-13 17:45:37,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:37,696 INFO L93 Difference]: Finished difference Result 169 states and 181 transitions. [2019-10-13 17:45:37,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-13 17:45:37,698 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 88 [2019-10-13 17:45:37,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:37,700 INFO L225 Difference]: With dead ends: 169 [2019-10-13 17:45:37,700 INFO L226 Difference]: Without dead ends: 98 [2019-10-13 17:45:37,702 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=800, Invalid=3232, Unknown=0, NotChecked=0, Total=4032 [2019-10-13 17:45:37,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-10-13 17:45:37,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2019-10-13 17:45:37,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-10-13 17:45:37,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2019-10-13 17:45:37,707 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 88 [2019-10-13 17:45:37,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:37,707 INFO L462 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2019-10-13 17:45:37,707 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-13 17:45:37,707 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2019-10-13 17:45:37,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-10-13 17:45:37,708 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:37,708 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:37,912 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:37,912 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:37,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:37,913 INFO L82 PathProgramCache]: Analyzing trace with hash -553957407, now seen corresponding path program 16 times [2019-10-13 17:45:37,913 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:37,914 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145049789] [2019-10-13 17:45:37,914 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:37,914 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:37,914 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:37,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,153 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 6 proven. 361 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-13 17:45:38,153 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145049789] [2019-10-13 17:45:38,153 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980891117] [2019-10-13 17:45:38,153 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:38,245 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:45:38,245 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:38,246 INFO L256 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-13 17:45:38,248 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:38,284 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 17:45:38,284 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:38,284 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-10-13 17:45:38,285 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394510673] [2019-10-13 17:45:38,287 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-13 17:45:38,287 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:38,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-13 17:45:38,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-13 17:45:38,288 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 24 states. [2019-10-13 17:45:38,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:38,438 INFO L93 Difference]: Finished difference Result 152 states and 158 transitions. [2019-10-13 17:45:38,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-13 17:45:38,440 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2019-10-13 17:45:38,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:38,441 INFO L225 Difference]: With dead ends: 152 [2019-10-13 17:45:38,441 INFO L226 Difference]: Without dead ends: 100 [2019-10-13 17:45:38,442 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-13 17:45:38,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-10-13 17:45:38,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2019-10-13 17:45:38,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2019-10-13 17:45:38,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2019-10-13 17:45:38,451 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 93 [2019-10-13 17:45:38,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:38,451 INFO L462 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2019-10-13 17:45:38,451 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-13 17:45:38,451 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2019-10-13 17:45:38,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-10-13 17:45:38,452 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:38,452 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:38,656 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:38,657 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:38,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:38,657 INFO L82 PathProgramCache]: Analyzing trace with hash -534855553, now seen corresponding path program 17 times [2019-10-13 17:45:38,658 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:38,658 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402978964] [2019-10-13 17:45:38,658 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:38,658 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:38,659 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:38,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:38,935 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 6 proven. 400 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-13 17:45:38,935 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402978964] [2019-10-13 17:45:38,936 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396443792] [2019-10-13 17:45:38,936 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:39,281 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2019-10-13 17:45:39,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:39,285 INFO L256 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-13 17:45:39,286 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:39,305 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 17:45:39,305 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:39,306 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-10-13 17:45:39,306 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339787486] [2019-10-13 17:45:39,306 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-13 17:45:39,306 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:39,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-13 17:45:39,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-13 17:45:39,307 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 25 states. [2019-10-13 17:45:39,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:39,422 INFO L93 Difference]: Finished difference Result 154 states and 160 transitions. [2019-10-13 17:45:39,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-13 17:45:39,423 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 95 [2019-10-13 17:45:39,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:39,424 INFO L225 Difference]: With dead ends: 154 [2019-10-13 17:45:39,424 INFO L226 Difference]: Without dead ends: 102 [2019-10-13 17:45:39,425 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-13 17:45:39,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-10-13 17:45:39,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2019-10-13 17:45:39,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2019-10-13 17:45:39,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2019-10-13 17:45:39,431 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 95 [2019-10-13 17:45:39,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:39,431 INFO L462 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2019-10-13 17:45:39,432 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-13 17:45:39,432 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2019-10-13 17:45:39,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-10-13 17:45:39,432 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:39,432 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:39,633 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:39,634 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:39,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:39,634 INFO L82 PathProgramCache]: Analyzing trace with hash 642156957, now seen corresponding path program 18 times [2019-10-13 17:45:39,635 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:39,635 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772154646] [2019-10-13 17:45:39,635 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:39,636 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:39,636 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:39,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:39,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:39,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:39,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:39,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:40,001 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 6 proven. 441 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-13 17:45:40,001 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772154646] [2019-10-13 17:45:40,001 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693328984] [2019-10-13 17:45:40,002 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:40,194 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2019-10-13 17:45:40,194 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:40,196 INFO L256 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-13 17:45:40,198 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:40,449 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-13 17:45:40,449 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:45:40,450 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:40,450 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:45:40,450 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-13 17:45:40,468 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:45:40,522 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 6 proven. 60 refuted. 0 times theorem prover too weak. 456 trivial. 0 not checked. [2019-10-13 17:45:40,522 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:40,522 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 15] total 38 [2019-10-13 17:45:40,523 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850743980] [2019-10-13 17:45:40,523 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-10-13 17:45:40,523 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:40,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-10-13 17:45:40,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1098, Unknown=0, NotChecked=0, Total=1406 [2019-10-13 17:45:40,524 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 38 states. [2019-10-13 17:45:41,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:41,870 INFO L93 Difference]: Finished difference Result 166 states and 173 transitions. [2019-10-13 17:45:41,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-13 17:45:41,870 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 97 [2019-10-13 17:45:41,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:41,871 INFO L225 Difference]: With dead ends: 166 [2019-10-13 17:45:41,871 INFO L226 Difference]: Without dead ends: 114 [2019-10-13 17:45:41,873 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=877, Invalid=3155, Unknown=0, NotChecked=0, Total=4032 [2019-10-13 17:45:41,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-13 17:45:41,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2019-10-13 17:45:41,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-10-13 17:45:41,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2019-10-13 17:45:41,878 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 97 [2019-10-13 17:45:41,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:41,878 INFO L462 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2019-10-13 17:45:41,879 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-10-13 17:45:41,879 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2019-10-13 17:45:41,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-10-13 17:45:41,879 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:41,880 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:42,083 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:42,084 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:42,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:42,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1729557646, now seen corresponding path program 19 times [2019-10-13 17:45:42,085 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:42,085 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211885825] [2019-10-13 17:45:42,086 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:42,086 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:42,086 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:42,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:42,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:42,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:42,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:42,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:42,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:42,408 INFO L134 CoverageAnalysis]: Checked inductivity of 593 backedges. 8 proven. 484 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2019-10-13 17:45:42,408 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211885825] [2019-10-13 17:45:42,408 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976381624] [2019-10-13 17:45:42,408 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:42,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:42,516 INFO L256 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-13 17:45:42,518 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:42,553 INFO L134 CoverageAnalysis]: Checked inductivity of 593 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-10-13 17:45:42,553 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:42,553 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-10-13 17:45:42,554 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782155607] [2019-10-13 17:45:42,554 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-13 17:45:42,554 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:42,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-13 17:45:42,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-13 17:45:42,555 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand 27 states. [2019-10-13 17:45:42,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:42,731 INFO L93 Difference]: Finished difference Result 174 states and 180 transitions. [2019-10-13 17:45:42,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-13 17:45:42,732 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 107 [2019-10-13 17:45:42,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:42,733 INFO L225 Difference]: With dead ends: 174 [2019-10-13 17:45:42,734 INFO L226 Difference]: Without dead ends: 114 [2019-10-13 17:45:42,735 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-13 17:45:42,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-13 17:45:42,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2019-10-13 17:45:42,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2019-10-13 17:45:42,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 116 transitions. [2019-10-13 17:45:42,740 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 116 transitions. Word has length 107 [2019-10-13 17:45:42,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:42,741 INFO L462 AbstractCegarLoop]: Abstraction has 113 states and 116 transitions. [2019-10-13 17:45:42,741 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-13 17:45:42,741 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 116 transitions. [2019-10-13 17:45:42,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2019-10-13 17:45:42,742 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:42,742 INFO L380 BasicCegarLoop]: trace histogram [23, 23, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:42,945 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:42,945 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:42,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:42,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1341778032, now seen corresponding path program 20 times [2019-10-13 17:45:42,946 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:42,947 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786238409] [2019-10-13 17:45:42,947 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:42,947 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:42,947 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:42,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:43,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:43,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:43,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:43,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:43,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:43,360 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 8 proven. 529 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2019-10-13 17:45:43,361 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786238409] [2019-10-13 17:45:43,361 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092300497] [2019-10-13 17:45:43,361 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:43,468 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:43,469 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:43,471 INFO L256 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-13 17:45:43,474 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:43,498 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-10-13 17:45:43,499 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:43,499 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-10-13 17:45:43,499 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544238597] [2019-10-13 17:45:43,500 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-13 17:45:43,500 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:43,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-13 17:45:43,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-13 17:45:43,501 INFO L87 Difference]: Start difference. First operand 113 states and 116 transitions. Second operand 28 states. [2019-10-13 17:45:43,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:43,674 INFO L93 Difference]: Finished difference Result 176 states and 182 transitions. [2019-10-13 17:45:43,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-13 17:45:43,675 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 109 [2019-10-13 17:45:43,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:43,676 INFO L225 Difference]: With dead ends: 176 [2019-10-13 17:45:43,676 INFO L226 Difference]: Without dead ends: 116 [2019-10-13 17:45:43,676 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-13 17:45:43,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-10-13 17:45:43,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2019-10-13 17:45:43,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-10-13 17:45:43,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 118 transitions. [2019-10-13 17:45:43,682 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 118 transitions. Word has length 109 [2019-10-13 17:45:43,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:43,682 INFO L462 AbstractCegarLoop]: Abstraction has 115 states and 118 transitions. [2019-10-13 17:45:43,682 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-13 17:45:43,682 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 118 transitions. [2019-10-13 17:45:43,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-10-13 17:45:43,683 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:43,683 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:43,887 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:43,888 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:43,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:43,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1947243566, now seen corresponding path program 21 times [2019-10-13 17:45:43,900 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:43,900 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085021737] [2019-10-13 17:45:43,900 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:43,900 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:43,900 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:43,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:44,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:44,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:44,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:44,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:44,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:44,397 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 8 proven. 576 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2019-10-13 17:45:44,397 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085021737] [2019-10-13 17:45:44,398 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136537352] [2019-10-13 17:45:44,398 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:44,532 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-13 17:45:44,533 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:44,535 INFO L256 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-13 17:45:44,539 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:45,155 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-13 17:45:45,158 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:45,159 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2019-10-13 17:45:45,159 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:45:45,169 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:45,170 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:45:45,170 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:29, output treesize:4 [2019-10-13 17:45:45,209 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:45:45,352 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 36 proven. 49 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2019-10-13 17:45:45,353 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:45,353 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 17] total 43 [2019-10-13 17:45:45,354 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660898364] [2019-10-13 17:45:45,354 INFO L442 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-10-13 17:45:45,356 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:45,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-10-13 17:45:45,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=1397, Unknown=0, NotChecked=0, Total=1806 [2019-10-13 17:45:45,358 INFO L87 Difference]: Start difference. First operand 115 states and 118 transitions. Second operand 43 states. [2019-10-13 17:45:47,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:47,979 INFO L93 Difference]: Finished difference Result 207 states and 220 transitions. [2019-10-13 17:45:47,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-10-13 17:45:47,979 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 111 [2019-10-13 17:45:47,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:47,981 INFO L225 Difference]: With dead ends: 207 [2019-10-13 17:45:47,981 INFO L226 Difference]: Without dead ends: 121 [2019-10-13 17:45:47,984 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1290 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1306, Invalid=5014, Unknown=0, NotChecked=0, Total=6320 [2019-10-13 17:45:47,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2019-10-13 17:45:47,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2019-10-13 17:45:47,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2019-10-13 17:45:47,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2019-10-13 17:45:47,990 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 111 [2019-10-13 17:45:47,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:47,990 INFO L462 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2019-10-13 17:45:47,990 INFO L463 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-10-13 17:45:47,990 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2019-10-13 17:45:47,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2019-10-13 17:45:47,991 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:47,991 INFO L380 BasicCegarLoop]: trace histogram [25, 25, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:48,193 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:48,194 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:48,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:48,195 INFO L82 PathProgramCache]: Analyzing trace with hash 1920998396, now seen corresponding path program 22 times [2019-10-13 17:45:48,195 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:48,195 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136411730] [2019-10-13 17:45:48,195 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:48,196 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:48,196 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:48,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:48,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:48,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:48,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:48,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:48,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:48,627 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 8 proven. 625 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-10-13 17:45:48,627 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136411730] [2019-10-13 17:45:48,628 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732516979] [2019-10-13 17:45:48,628 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:48,770 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:45:48,771 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:48,773 INFO L256 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-13 17:45:48,777 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:48,839 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2019-10-13 17:45:48,840 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:48,840 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-10-13 17:45:48,840 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081142633] [2019-10-13 17:45:48,840 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-13 17:45:48,841 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:48,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-13 17:45:48,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:45:48,842 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 30 states. [2019-10-13 17:45:49,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:49,083 INFO L93 Difference]: Finished difference Result 186 states and 192 transitions. [2019-10-13 17:45:49,083 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-13 17:45:49,083 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 116 [2019-10-13 17:45:49,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:49,085 INFO L225 Difference]: With dead ends: 186 [2019-10-13 17:45:49,085 INFO L226 Difference]: Without dead ends: 123 [2019-10-13 17:45:49,086 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:45:49,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2019-10-13 17:45:49,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2019-10-13 17:45:49,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2019-10-13 17:45:49,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 125 transitions. [2019-10-13 17:45:49,096 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 125 transitions. Word has length 116 [2019-10-13 17:45:49,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:49,097 INFO L462 AbstractCegarLoop]: Abstraction has 122 states and 125 transitions. [2019-10-13 17:45:49,097 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-13 17:45:49,097 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 125 transitions. [2019-10-13 17:45:49,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2019-10-13 17:45:49,098 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:49,098 INFO L380 BasicCegarLoop]: trace histogram [26, 26, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:49,303 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:49,303 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:49,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:49,303 INFO L82 PathProgramCache]: Analyzing trace with hash 501993886, now seen corresponding path program 23 times [2019-10-13 17:45:49,303 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:49,303 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771656718] [2019-10-13 17:45:49,304 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:49,304 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:49,304 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:49,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:49,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:49,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:49,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:49,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:49,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:49,666 INFO L134 CoverageAnalysis]: Checked inductivity of 803 backedges. 8 proven. 676 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-10-13 17:45:49,667 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771656718] [2019-10-13 17:45:49,667 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689875000] [2019-10-13 17:45:49,667 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:50,166 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 27 check-sat command(s) [2019-10-13 17:45:50,167 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:50,169 INFO L256 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-13 17:45:50,172 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:50,195 INFO L134 CoverageAnalysis]: Checked inductivity of 803 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2019-10-13 17:45:50,195 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:50,195 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-10-13 17:45:50,195 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136500069] [2019-10-13 17:45:50,196 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-13 17:45:50,196 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:50,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-13 17:45:50,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-13 17:45:50,197 INFO L87 Difference]: Start difference. First operand 122 states and 125 transitions. Second operand 31 states. [2019-10-13 17:45:50,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:50,408 INFO L93 Difference]: Finished difference Result 188 states and 194 transitions. [2019-10-13 17:45:50,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-13 17:45:50,409 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 118 [2019-10-13 17:45:50,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:50,410 INFO L225 Difference]: With dead ends: 188 [2019-10-13 17:45:50,410 INFO L226 Difference]: Without dead ends: 125 [2019-10-13 17:45:50,411 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-13 17:45:50,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-10-13 17:45:50,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2019-10-13 17:45:50,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-10-13 17:45:50,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 127 transitions. [2019-10-13 17:45:50,418 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 127 transitions. Word has length 118 [2019-10-13 17:45:50,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:50,419 INFO L462 AbstractCegarLoop]: Abstraction has 124 states and 127 transitions. [2019-10-13 17:45:50,419 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-13 17:45:50,419 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 127 transitions. [2019-10-13 17:45:50,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-10-13 17:45:50,420 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:50,420 INFO L380 BasicCegarLoop]: trace histogram [27, 27, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:50,625 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:50,626 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:50,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:50,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1656707392, now seen corresponding path program 24 times [2019-10-13 17:45:50,627 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:50,627 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185524089] [2019-10-13 17:45:50,627 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:50,627 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:50,628 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:50,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:51,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:51,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:51,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:51,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:51,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:51,229 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 8 proven. 729 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-10-13 17:45:51,229 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185524089] [2019-10-13 17:45:51,230 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159367254] [2019-10-13 17:45:51,230 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:51,491 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-13 17:45:51,492 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:51,494 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 36 conjunts are in the unsatisfiable core [2019-10-13 17:45:51,497 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:51,893 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-13 17:45:51,893 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:45:51,894 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:51,895 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:45:51,895 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-13 17:45:51,918 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:45:51,998 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 8 proven. 92 refuted. 0 times theorem prover too weak. 756 trivial. 0 not checked. [2019-10-13 17:45:51,999 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:51,999 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 17] total 46 [2019-10-13 17:45:51,999 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603145399] [2019-10-13 17:45:51,999 INFO L442 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-10-13 17:45:52,000 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:52,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-10-13 17:45:52,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=472, Invalid=1598, Unknown=0, NotChecked=0, Total=2070 [2019-10-13 17:45:52,001 INFO L87 Difference]: Start difference. First operand 124 states and 127 transitions. Second operand 46 states. [2019-10-13 17:45:53,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:53,800 INFO L93 Difference]: Finished difference Result 200 states and 207 transitions. [2019-10-13 17:45:53,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-10-13 17:45:53,801 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 120 [2019-10-13 17:45:53,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:53,802 INFO L225 Difference]: With dead ends: 200 [2019-10-13 17:45:53,802 INFO L226 Difference]: Without dead ends: 137 [2019-10-13 17:45:53,804 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1097 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1359, Invalid=4647, Unknown=0, NotChecked=0, Total=6006 [2019-10-13 17:45:53,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-10-13 17:45:53,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 134. [2019-10-13 17:45:53,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2019-10-13 17:45:53,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 137 transitions. [2019-10-13 17:45:53,811 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 137 transitions. Word has length 120 [2019-10-13 17:45:53,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:53,811 INFO L462 AbstractCegarLoop]: Abstraction has 134 states and 137 transitions. [2019-10-13 17:45:53,811 INFO L463 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-10-13 17:45:53,811 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 137 transitions. [2019-10-13 17:45:53,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2019-10-13 17:45:53,812 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:53,812 INFO L380 BasicCegarLoop]: trace histogram [28, 28, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:54,016 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:54,017 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:54,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:54,017 INFO L82 PathProgramCache]: Analyzing trace with hash -323867495, now seen corresponding path program 25 times [2019-10-13 17:45:54,018 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:54,018 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750221419] [2019-10-13 17:45:54,018 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:54,018 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:54,019 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:54,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:54,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:54,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:54,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:54,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:54,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:54,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:54,423 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 10 proven. 784 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-10-13 17:45:54,423 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750221419] [2019-10-13 17:45:54,423 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453281819] [2019-10-13 17:45:54,423 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:54,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:54,521 INFO L256 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-13 17:45:54,524 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:54,570 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2019-10-13 17:45:54,571 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:54,571 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-10-13 17:45:54,571 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113469992] [2019-10-13 17:45:54,572 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-13 17:45:54,572 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:54,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-13 17:45:54,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-13 17:45:54,573 INFO L87 Difference]: Start difference. First operand 134 states and 137 transitions. Second operand 33 states. [2019-10-13 17:45:54,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:54,689 INFO L93 Difference]: Finished difference Result 208 states and 214 transitions. [2019-10-13 17:45:54,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-13 17:45:54,690 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 130 [2019-10-13 17:45:54,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:54,691 INFO L225 Difference]: With dead ends: 208 [2019-10-13 17:45:54,691 INFO L226 Difference]: Without dead ends: 137 [2019-10-13 17:45:54,692 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-13 17:45:54,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-10-13 17:45:54,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2019-10-13 17:45:54,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-10-13 17:45:54,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 139 transitions. [2019-10-13 17:45:54,700 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 139 transitions. Word has length 130 [2019-10-13 17:45:54,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:54,700 INFO L462 AbstractCegarLoop]: Abstraction has 136 states and 139 transitions. [2019-10-13 17:45:54,700 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-13 17:45:54,700 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 139 transitions. [2019-10-13 17:45:54,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-10-13 17:45:54,701 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:54,701 INFO L380 BasicCegarLoop]: trace histogram [29, 29, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:54,905 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:54,905 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:54,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:54,906 INFO L82 PathProgramCache]: Analyzing trace with hash -1076470085, now seen corresponding path program 26 times [2019-10-13 17:45:54,906 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:54,907 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103438860] [2019-10-13 17:45:54,907 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:54,907 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:54,907 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:54,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:55,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:55,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:55,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:55,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:55,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:55,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:55,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1004 backedges. 10 proven. 841 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-10-13 17:45:55,582 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103438860] [2019-10-13 17:45:55,583 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038295160] [2019-10-13 17:45:55,583 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:55,685 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:55,686 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:55,687 INFO L256 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-13 17:45:55,689 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:55,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1004 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2019-10-13 17:45:55,711 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:55,711 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2019-10-13 17:45:55,711 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93316966] [2019-10-13 17:45:55,712 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-13 17:45:55,712 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:55,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-13 17:45:55,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-10-13 17:45:55,713 INFO L87 Difference]: Start difference. First operand 136 states and 139 transitions. Second operand 34 states. [2019-10-13 17:45:55,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:55,905 INFO L93 Difference]: Finished difference Result 210 states and 216 transitions. [2019-10-13 17:45:55,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-13 17:45:55,905 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 132 [2019-10-13 17:45:55,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:55,906 INFO L225 Difference]: With dead ends: 210 [2019-10-13 17:45:55,907 INFO L226 Difference]: Without dead ends: 139 [2019-10-13 17:45:55,908 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-10-13 17:45:55,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2019-10-13 17:45:55,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2019-10-13 17:45:55,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2019-10-13 17:45:55,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 141 transitions. [2019-10-13 17:45:55,914 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 141 transitions. Word has length 132 [2019-10-13 17:45:55,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:55,915 INFO L462 AbstractCegarLoop]: Abstraction has 138 states and 141 transitions. [2019-10-13 17:45:55,915 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-13 17:45:55,915 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 141 transitions. [2019-10-13 17:45:55,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2019-10-13 17:45:55,916 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:55,916 INFO L380 BasicCegarLoop]: trace histogram [30, 30, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:56,120 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:56,120 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:56,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:56,121 INFO L82 PathProgramCache]: Analyzing trace with hash 1521913949, now seen corresponding path program 27 times [2019-10-13 17:45:56,121 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:56,121 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165431097] [2019-10-13 17:45:56,121 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:56,121 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:56,121 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:56,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1063 backedges. 10 proven. 900 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-10-13 17:45:56,561 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165431097] [2019-10-13 17:45:56,562 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252504538] [2019-10-13 17:45:56,562 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:56,667 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-10-13 17:45:56,667 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:56,668 INFO L256 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 38 conjunts are in the unsatisfiable core [2019-10-13 17:45:56,670 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:57,060 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 8 [2019-10-13 17:45:57,061 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:45:57,062 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:45:57,062 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:45:57,062 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:20, output treesize:4 [2019-10-13 17:45:57,087 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:45:57,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1063 backedges. 10 proven. 113 refuted. 0 times theorem prover too weak. 940 trivial. 0 not checked. [2019-10-13 17:45:57,176 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:57,176 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 19] total 51 [2019-10-13 17:45:57,176 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257155190] [2019-10-13 17:45:57,176 INFO L442 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-10-13 17:45:57,177 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:57,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-10-13 17:45:57,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=1979, Unknown=0, NotChecked=0, Total=2550 [2019-10-13 17:45:57,178 INFO L87 Difference]: Start difference. First operand 138 states and 141 transitions. Second operand 51 states. [2019-10-13 17:45:59,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:59,256 INFO L93 Difference]: Finished difference Result 249 states and 264 transitions. [2019-10-13 17:45:59,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-10-13 17:45:59,259 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 134 [2019-10-13 17:45:59,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:59,261 INFO L225 Difference]: With dead ends: 249 [2019-10-13 17:45:59,261 INFO L226 Difference]: Without dead ends: 178 [2019-10-13 17:45:59,264 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1640, Invalid=5500, Unknown=0, NotChecked=0, Total=7140 [2019-10-13 17:45:59,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2019-10-13 17:45:59,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 171. [2019-10-13 17:45:59,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2019-10-13 17:45:59,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 181 transitions. [2019-10-13 17:45:59,273 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 181 transitions. Word has length 134 [2019-10-13 17:45:59,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:59,273 INFO L462 AbstractCegarLoop]: Abstraction has 171 states and 181 transitions. [2019-10-13 17:45:59,273 INFO L463 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-10-13 17:45:59,273 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 181 transitions. [2019-10-13 17:45:59,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2019-10-13 17:45:59,275 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:59,276 INFO L380 BasicCegarLoop]: trace histogram [31, 31, 8, 8, 7, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:59,479 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:59,480 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:59,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:59,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1836627785, now seen corresponding path program 28 times [2019-10-13 17:45:59,480 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:59,480 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803516733] [2019-10-13 17:45:59,480 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:59,480 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:59,481 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:59,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:59,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:59,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:59,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:59,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:59,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:59,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:59,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1145 backedges. 10 proven. 961 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2019-10-13 17:45:59,975 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803516733] [2019-10-13 17:45:59,975 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674508898] [2019-10-13 17:45:59,975 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:46:00,089 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:46:00,090 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:46:00,091 INFO L256 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 33 conjunts are in the unsatisfiable core [2019-10-13 17:46:00,093 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:46:00,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1145 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2019-10-13 17:46:00,128 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:46:00,128 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-10-13 17:46:00,128 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699720837] [2019-10-13 17:46:00,129 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-13 17:46:00,129 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:46:00,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-13 17:46:00,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 17:46:00,131 INFO L87 Difference]: Start difference. First operand 171 states and 181 transitions. Second operand 36 states. [2019-10-13 17:46:00,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:46:00,284 INFO L93 Difference]: Finished difference Result 276 states and 296 transitions. [2019-10-13 17:46:00,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-10-13 17:46:00,284 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 139 [2019-10-13 17:46:00,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:46:00,285 INFO L225 Difference]: With dead ends: 276 [2019-10-13 17:46:00,286 INFO L226 Difference]: Without dead ends: 174 [2019-10-13 17:46:00,286 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 17:46:00,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2019-10-13 17:46:00,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2019-10-13 17:46:00,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2019-10-13 17:46:00,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 183 transitions. [2019-10-13 17:46:00,296 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 183 transitions. Word has length 139 [2019-10-13 17:46:00,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:46:00,296 INFO L462 AbstractCegarLoop]: Abstraction has 173 states and 183 transitions. [2019-10-13 17:46:00,296 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-13 17:46:00,297 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 183 transitions. [2019-10-13 17:46:00,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-10-13 17:46:00,298 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:46:00,298 INFO L380 BasicCegarLoop]: trace histogram [32, 32, 8, 8, 7, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:46:00,502 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:46:00,502 INFO L410 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:46:00,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:46:00,502 INFO L82 PathProgramCache]: Analyzing trace with hash -776184619, now seen corresponding path program 29 times [2019-10-13 17:46:00,502 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:46:00,503 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482633632] [2019-10-13 17:46:00,503 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:46:00,503 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:46:00,503 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:46:00,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat