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_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:46:57,364 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:46:57,366 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:46:57,383 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:46:57,383 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:46:57,386 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:46:57,388 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:46:57,398 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:46:57,400 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:46:57,402 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:46:57,404 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:46:57,406 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:46:57,406 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:46:57,410 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:46:57,412 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:46:57,414 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:46:57,415 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:46:57,418 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:46:57,419 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:46:57,425 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:46:57,429 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:46:57,433 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:46:57,436 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:46:57,436 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:46:57,439 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 17:46:57,439 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 17:46:57,440 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 17:46:57,441 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 17:46:57,443 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 17:46:57,444 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 17:46:57,445 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:46:57,446 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:46:57,447 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:46:57,448 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:46:57,450 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:46:57,450 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:46:57,451 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:46:57,451 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:46:57,451 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:46:57,452 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:46:57,453 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:46:57,454 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 17:46:57,488 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:46:57,489 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:46:57,492 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:46:57,493 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:46:57,493 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:46:57,493 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:46:57,493 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:46:57,494 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:46:57,494 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:46:57,494 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:46:57,494 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:46:57,494 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:46:57,494 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:46:57,495 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:46:57,495 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:46:57,495 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:46:57,495 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:46:57,495 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:46:57,496 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:46:57,496 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:46:57,496 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:46:57,496 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:46:57,496 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:46:57,497 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:46:57,497 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:46:57,497 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:46:57,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:46:57,497 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:46:57,498 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:46:57,793 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:46:57,806 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:46:57,809 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:46:57,811 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:46:57,811 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:46:57,812 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-10-13 17:46:57,893 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8412e5b6f/3cdc97203559493fb436e2501e5d0db4/FLAG593457df9 [2019-10-13 17:46:58,382 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:46:58,383 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-10-13 17:46:58,388 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8412e5b6f/3cdc97203559493fb436e2501e5d0db4/FLAG593457df9 [2019-10-13 17:46:58,780 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8412e5b6f/3cdc97203559493fb436e2501e5d0db4 [2019-10-13 17:46:58,791 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:46:58,793 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:46:58,798 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:46:58,798 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:46:58,802 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:46:58,804 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:46:58" (1/1) ... [2019-10-13 17:46:58,807 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2db4663a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:58, skipping insertion in model container [2019-10-13 17:46:58,807 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:46:58" (1/1) ... [2019-10-13 17:46:58,816 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:46:58,836 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:46:59,027 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:46:59,039 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:46:59,062 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:46:59,082 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:46:59,082 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59 WrapperNode [2019-10-13 17:46:59,082 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:46:59,083 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:46:59,083 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:46:59,083 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:46:59,179 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59" (1/1) ... [2019-10-13 17:46:59,180 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59" (1/1) ... [2019-10-13 17:46:59,186 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59" (1/1) ... [2019-10-13 17:46:59,187 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59" (1/1) ... [2019-10-13 17:46:59,194 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59" (1/1) ... [2019-10-13 17:46:59,200 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59" (1/1) ... [2019-10-13 17:46:59,201 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59" (1/1) ... [2019-10-13 17:46:59,203 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:46:59,204 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:46:59,204 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:46:59,204 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:46:59,205 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59" (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 17:46:59,265 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:46:59,265 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:46:59,266 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 17:46:59,266 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:46:59,266 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:46:59,266 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 17:46:59,266 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 17:46:59,266 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:46:59,266 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-13 17:46:59,267 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 17:46:59,267 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 17:46:59,267 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 17:46:59,267 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:46:59,267 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:46:59,558 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:46:59,558 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-13 17:46:59,560 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:46:59 BoogieIcfgContainer [2019-10-13 17:46:59,561 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:46:59,562 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:46:59,562 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:46:59,568 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:46:59,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:46:58" (1/3) ... [2019-10-13 17:46:59,570 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c7fb22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:46:59, skipping insertion in model container [2019-10-13 17:46:59,570 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:46:59" (2/3) ... [2019-10-13 17:46:59,571 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c7fb22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:46:59, skipping insertion in model container [2019-10-13 17:46:59,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:46:59" (3/3) ... [2019-10-13 17:46:59,573 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2019-10-13 17:46:59,583 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:46:59,604 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:46:59,614 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:46:59,637 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:46:59,638 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:46:59,638 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:46:59,638 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:46:59,638 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:46:59,638 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:46:59,638 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:46:59,638 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:46:59,654 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-13 17:46:59,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-13 17:46:59,661 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:46:59,662 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:46:59,664 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:46:59,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:46:59,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1778002988, now seen corresponding path program 1 times [2019-10-13 17:46:59,681 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:46:59,681 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256763123] [2019-10-13 17:46:59,682 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:46:59,682 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:46:59,682 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:46:59,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:46:59,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:46:59,861 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 17:46:59,862 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256763123] [2019-10-13 17:46:59,863 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:46:59,864 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 17:46:59,864 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353425873] [2019-10-13 17:46:59,869 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 17:46:59,870 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:46:59,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 17:46:59,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:46:59,888 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-10-13 17:47:00,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:00,012 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2019-10-13 17:47:00,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 17:47:00,015 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-13 17:47:00,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:00,026 INFO L225 Difference]: With dead ends: 46 [2019-10-13 17:47:00,026 INFO L226 Difference]: Without dead ends: 22 [2019-10-13 17:47:00,030 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 17:47:00,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-13 17:47:00,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-13 17:47:00,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-13 17:47:00,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-10-13 17:47:00,090 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2019-10-13 17:47:00,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:00,091 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-10-13 17:47:00,092 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 17:47:00,093 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-10-13 17:47:00,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-13 17:47:00,096 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:00,097 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:00,098 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:00,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:00,100 INFO L82 PathProgramCache]: Analyzing trace with hash -262172122, now seen corresponding path program 1 times [2019-10-13 17:47:00,100 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:00,101 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842538569] [2019-10-13 17:47:00,101 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:00,102 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:00,102 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:00,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:00,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:00,233 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 17:47:00,233 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842538569] [2019-10-13 17:47:00,234 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:47:00,234 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:47:00,234 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323540943] [2019-10-13 17:47:00,236 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:47:00,237 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:00,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:47:00,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:47:00,238 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2019-10-13 17:47:00,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:00,325 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2019-10-13 17:47:00,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:47:00,326 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-13 17:47:00,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:00,328 INFO L225 Difference]: With dead ends: 40 [2019-10-13 17:47:00,328 INFO L226 Difference]: Without dead ends: 26 [2019-10-13 17:47:00,329 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 17:47:00,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-13 17:47:00,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2019-10-13 17:47:00,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-13 17:47:00,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-13 17:47:00,338 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 15 [2019-10-13 17:47:00,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:00,338 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-13 17:47:00,338 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:47:00,339 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-13 17:47:00,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-13 17:47:00,339 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:00,340 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:00,340 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:00,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:00,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1323409058, now seen corresponding path program 1 times [2019-10-13 17:47:00,341 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:00,341 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633061317] [2019-10-13 17:47:00,342 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:00,342 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:00,342 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:00,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:00,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:00,477 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:47:00,477 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633061317] [2019-10-13 17:47:00,478 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652820288] [2019-10-13 17:47:00,478 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 17:47:00,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:00,551 INFO L256 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:47:00,561 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:00,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:47:00,605 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:00,605 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-13 17:47:00,605 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422189209] [2019-10-13 17:47:00,606 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:47:00,606 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:00,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:47:00,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:47:00,607 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 6 states. [2019-10-13 17:47:00,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:00,722 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-10-13 17:47:00,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 17:47:00,724 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2019-10-13 17:47:00,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:00,725 INFO L225 Difference]: With dead ends: 45 [2019-10-13 17:47:00,725 INFO L226 Difference]: Without dead ends: 30 [2019-10-13 17:47:00,727 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 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 17:47:00,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-13 17:47:00,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2019-10-13 17:47:00,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-13 17:47:00,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-10-13 17:47:00,736 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 19 [2019-10-13 17:47:00,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:00,736 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-10-13 17:47:00,736 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:47:00,737 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-10-13 17:47:00,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-13 17:47:00,738 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:00,739 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 17:47:00,952 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:00,953 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:00,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:00,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1582955806, now seen corresponding path program 2 times [2019-10-13 17:47:00,954 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:00,954 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623271556] [2019-10-13 17:47:00,954 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:00,955 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:00,955 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:00,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:01,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:01,085 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-13 17:47:01,085 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623271556] [2019-10-13 17:47:01,086 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860570039] [2019-10-13 17:47:01,086 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 17:47:01,154 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:47:01,170 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:01,172 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:47:01,176 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:01,201 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-13 17:47:01,202 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:01,203 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-13 17:47:01,203 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372348711] [2019-10-13 17:47:01,204 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-13 17:47:01,204 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:01,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-13 17:47:01,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:47:01,206 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 7 states. [2019-10-13 17:47:01,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:01,318 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2019-10-13 17:47:01,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:47:01,320 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-10-13 17:47:01,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:01,321 INFO L225 Difference]: With dead ends: 51 [2019-10-13 17:47:01,321 INFO L226 Difference]: Without dead ends: 34 [2019-10-13 17:47:01,322 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 17:47:01,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-13 17:47:01,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-10-13 17:47:01,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-13 17:47:01,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-10-13 17:47:01,336 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 23 [2019-10-13 17:47:01,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:01,337 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-10-13 17:47:01,337 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-13 17:47:01,337 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-10-13 17:47:01,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-13 17:47:01,338 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:01,339 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:01,542 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:01,543 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:01,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:01,544 INFO L82 PathProgramCache]: Analyzing trace with hash -657216102, now seen corresponding path program 3 times [2019-10-13 17:47:01,544 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:01,545 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445826574] [2019-10-13 17:47:01,545 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:01,546 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:01,546 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:01,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:01,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:01,631 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:47:01,631 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445826574] [2019-10-13 17:47:01,632 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894016943] [2019-10-13 17:47:01,632 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 17:47:01,679 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-13 17:47:01,680 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:01,680 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-13 17:47:01,683 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:01,708 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:47:01,709 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:01,709 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-13 17:47:01,709 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055527553] [2019-10-13 17:47:01,710 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 17:47:01,710 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:01,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 17:47:01,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:47:01,711 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 8 states. [2019-10-13 17:47:01,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:01,799 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2019-10-13 17:47:01,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:47:01,800 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2019-10-13 17:47:01,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:01,801 INFO L225 Difference]: With dead ends: 57 [2019-10-13 17:47:01,801 INFO L226 Difference]: Without dead ends: 38 [2019-10-13 17:47:01,802 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:47:01,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-13 17:47:01,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2019-10-13 17:47:01,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-13 17:47:01,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-10-13 17:47:01,808 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2019-10-13 17:47:01,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:01,809 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-10-13 17:47:01,809 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 17:47:01,809 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-10-13 17:47:01,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-13 17:47:01,810 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:01,810 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:02,014 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:02,015 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:02,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:02,015 INFO L82 PathProgramCache]: Analyzing trace with hash 702132246, now seen corresponding path program 4 times [2019-10-13 17:47:02,015 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:02,016 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778431782] [2019-10-13 17:47:02,016 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:02,016 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:02,017 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:02,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:02,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:02,133 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:47:02,134 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778431782] [2019-10-13 17:47:02,134 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645229591] [2019-10-13 17:47:02,134 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:02,184 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:47:02,184 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:02,185 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:47:02,187 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:02,202 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:47:02,203 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:02,203 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-13 17:47:02,203 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584490698] [2019-10-13 17:47:02,204 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 17:47:02,204 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:02,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 17:47:02,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:47:02,205 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 9 states. [2019-10-13 17:47:02,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:02,312 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2019-10-13 17:47:02,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 17:47:02,312 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2019-10-13 17:47:02,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:02,313 INFO L225 Difference]: With dead ends: 63 [2019-10-13 17:47:02,313 INFO L226 Difference]: Without dead ends: 42 [2019-10-13 17:47:02,314 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:47:02,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-13 17:47:02,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-10-13 17:47:02,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-13 17:47:02,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-10-13 17:47:02,321 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2019-10-13 17:47:02,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:02,321 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-10-13 17:47:02,321 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 17:47:02,321 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-10-13 17:47:02,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-13 17:47:02,322 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:02,322 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:02,523 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:02,524 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:02,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:02,524 INFO L82 PathProgramCache]: Analyzing trace with hash -294189934, now seen corresponding path program 5 times [2019-10-13 17:47:02,525 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:02,525 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119980246] [2019-10-13 17:47:02,525 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:02,526 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:02,526 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:02,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:02,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:02,654 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:47:02,654 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119980246] [2019-10-13 17:47:02,655 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769730627] [2019-10-13 17:47:02,655 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:02,814 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-13 17:47:02,814 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:02,816 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 17:47:02,819 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:02,843 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:47:02,844 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:02,844 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-13 17:47:02,845 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951428072] [2019-10-13 17:47:02,845 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-13 17:47:02,845 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:02,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-13 17:47:02,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-13 17:47:02,848 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 10 states. [2019-10-13 17:47:02,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:02,989 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2019-10-13 17:47:02,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-13 17:47:02,990 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 35 [2019-10-13 17:47:02,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:02,991 INFO L225 Difference]: With dead ends: 69 [2019-10-13 17:47:02,991 INFO L226 Difference]: Without dead ends: 46 [2019-10-13 17:47:02,993 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 36 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 17:47:02,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-13 17:47:03,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2019-10-13 17:47:03,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-13 17:47:03,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-10-13 17:47:03,006 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 35 [2019-10-13 17:47:03,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:03,006 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-10-13 17:47:03,006 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-13 17:47:03,007 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-10-13 17:47:03,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-13 17:47:03,009 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:03,009 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:03,211 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:03,212 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:03,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:03,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1966517006, now seen corresponding path program 6 times [2019-10-13 17:47:03,213 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:03,214 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965562866] [2019-10-13 17:47:03,214 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:03,214 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:03,215 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:03,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:03,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:03,369 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:47:03,369 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965562866] [2019-10-13 17:47:03,370 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416975467] [2019-10-13 17:47:03,370 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:03,476 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-13 17:47:03,476 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:03,479 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 17:47:03,481 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:03,512 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:47:03,512 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:03,513 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-13 17:47:03,513 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643171561] [2019-10-13 17:47:03,514 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-13 17:47:03,514 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:03,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-13 17:47:03,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:47:03,515 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2019-10-13 17:47:03,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:03,648 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2019-10-13 17:47:03,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-13 17:47:03,649 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2019-10-13 17:47:03,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:03,650 INFO L225 Difference]: With dead ends: 75 [2019-10-13 17:47:03,651 INFO L226 Difference]: Without dead ends: 50 [2019-10-13 17:47:03,652 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:47:03,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-13 17:47:03,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2019-10-13 17:47:03,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-13 17:47:03,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2019-10-13 17:47:03,661 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 39 [2019-10-13 17:47:03,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:03,661 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2019-10-13 17:47:03,661 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-13 17:47:03,662 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2019-10-13 17:47:03,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-13 17:47:03,663 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:03,663 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:03,869 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:03,869 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:03,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:03,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1042523018, now seen corresponding path program 7 times [2019-10-13 17:47:03,870 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:03,870 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348579393] [2019-10-13 17:47:03,870 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:03,870 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:03,870 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:03,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:04,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:04,021 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-13 17:47:04,022 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348579393] [2019-10-13 17:47:04,022 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875109356] [2019-10-13 17:47:04,022 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:04,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:04,068 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 17:47:04,071 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:04,087 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-13 17:47:04,088 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:04,088 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-13 17:47:04,088 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818529536] [2019-10-13 17:47:04,089 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 17:47:04,089 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:04,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 17:47:04,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:47:04,090 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 12 states. [2019-10-13 17:47:04,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:04,233 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2019-10-13 17:47:04,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-13 17:47:04,233 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 43 [2019-10-13 17:47:04,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:04,234 INFO L225 Difference]: With dead ends: 81 [2019-10-13 17:47:04,234 INFO L226 Difference]: Without dead ends: 54 [2019-10-13 17:47:04,235 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:47:04,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-13 17:47:04,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-10-13 17:47:04,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-13 17:47:04,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-10-13 17:47:04,241 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 43 [2019-10-13 17:47:04,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:04,241 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-10-13 17:47:04,241 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 17:47:04,242 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-10-13 17:47:04,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-13 17:47:04,243 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:04,243 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:04,446 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:04,447 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:04,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:04,447 INFO L82 PathProgramCache]: Analyzing trace with hash 2059988486, now seen corresponding path program 8 times [2019-10-13 17:47:04,447 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:04,447 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [960078920] [2019-10-13 17:47:04,448 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:04,448 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:04,448 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:04,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:04,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:04,580 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-13 17:47:04,580 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [960078920] [2019-10-13 17:47:04,580 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206926008] [2019-10-13 17:47:04,580 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:04,631 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:47:04,631 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:04,632 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:47:04,639 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:04,658 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-13 17:47:04,659 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:04,659 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-13 17:47:04,659 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264603261] [2019-10-13 17:47:04,660 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-13 17:47:04,661 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:04,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-13 17:47:04,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:47:04,662 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 13 states. [2019-10-13 17:47:04,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:04,799 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2019-10-13 17:47:04,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 17:47:04,799 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 47 [2019-10-13 17:47:04,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:04,800 INFO L225 Difference]: With dead ends: 87 [2019-10-13 17:47:04,800 INFO L226 Difference]: Without dead ends: 58 [2019-10-13 17:47:04,801 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 48 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 17:47:04,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-13 17:47:04,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2019-10-13 17:47:04,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-13 17:47:04,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-10-13 17:47:04,807 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 47 [2019-10-13 17:47:04,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:04,807 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-10-13 17:47:04,807 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-13 17:47:04,807 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-10-13 17:47:04,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-13 17:47:04,808 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:04,809 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:05,012 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:05,012 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:05,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:05,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1909355902, now seen corresponding path program 9 times [2019-10-13 17:47:05,014 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:05,014 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714419725] [2019-10-13 17:47:05,014 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:05,014 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:05,014 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:05,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:05,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:05,139 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 17:47:05,139 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714419725] [2019-10-13 17:47:05,139 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213228669] [2019-10-13 17:47:05,139 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:05,572 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-13 17:47:05,572 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:05,574 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-13 17:47:05,576 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:05,599 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 17:47:05,600 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:05,600 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-13 17:47:05,600 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273682331] [2019-10-13 17:47:05,601 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:47:05,601 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:05,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:47:05,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:47:05,602 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 14 states. [2019-10-13 17:47:05,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:05,760 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2019-10-13 17:47:05,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 17:47:05,760 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 51 [2019-10-13 17:47:05,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:05,761 INFO L225 Difference]: With dead ends: 93 [2019-10-13 17:47:05,761 INFO L226 Difference]: Without dead ends: 62 [2019-10-13 17:47:05,762 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:47:05,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-13 17:47:05,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2019-10-13 17:47:05,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-13 17:47:05,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-10-13 17:47:05,770 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 51 [2019-10-13 17:47:05,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:05,770 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-10-13 17:47:05,771 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:47:05,771 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-10-13 17:47:05,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-13 17:47:05,772 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:05,772 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:05,984 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:05,984 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:05,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:05,985 INFO L82 PathProgramCache]: Analyzing trace with hash -1930921730, now seen corresponding path program 10 times [2019-10-13 17:47:05,985 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:05,986 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646268279] [2019-10-13 17:47:05,986 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:05,986 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:05,986 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:06,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:06,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:06,145 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-13 17:47:06,145 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646268279] [2019-10-13 17:47:06,145 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330178078] [2019-10-13 17:47:06,145 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 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 17:47:06,203 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:47:06,203 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:06,204 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:47:06,217 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:06,239 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-13 17:47:06,239 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:06,239 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-13 17:47:06,240 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065943688] [2019-10-13 17:47:06,240 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-13 17:47:06,240 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:06,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-13 17:47:06,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:47:06,241 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 15 states. [2019-10-13 17:47:06,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:06,420 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2019-10-13 17:47:06,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 17:47:06,420 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 55 [2019-10-13 17:47:06,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:06,421 INFO L225 Difference]: With dead ends: 99 [2019-10-13 17:47:06,421 INFO L226 Difference]: Without dead ends: 66 [2019-10-13 17:47:06,422 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:47:06,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-13 17:47:06,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2019-10-13 17:47:06,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-13 17:47:06,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-10-13 17:47:06,428 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 55 [2019-10-13 17:47:06,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:06,428 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-10-13 17:47:06,428 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-13 17:47:06,429 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-10-13 17:47:06,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-13 17:47:06,430 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:06,430 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:06,630 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:06,631 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:06,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:06,632 INFO L82 PathProgramCache]: Analyzing trace with hash -1124550278, now seen corresponding path program 11 times [2019-10-13 17:47:06,632 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:06,632 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756145140] [2019-10-13 17:47:06,633 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:06,633 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:06,633 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:06,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:06,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:06,785 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-13 17:47:06,786 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756145140] [2019-10-13 17:47:06,786 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783362733] [2019-10-13 17:47:06,786 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 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 17:47:07,468 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-13 17:47:07,468 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:07,472 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 17:47:07,475 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:07,492 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-13 17:47:07,493 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:07,493 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-13 17:47:07,493 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223028183] [2019-10-13 17:47:07,495 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-13 17:47:07,495 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:07,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-13 17:47:07,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:47:07,496 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 16 states. [2019-10-13 17:47:07,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:07,617 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2019-10-13 17:47:07,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 17:47:07,618 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 59 [2019-10-13 17:47:07,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:07,619 INFO L225 Difference]: With dead ends: 105 [2019-10-13 17:47:07,619 INFO L226 Difference]: Without dead ends: 70 [2019-10-13 17:47:07,620 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:47:07,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-13 17:47:07,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2019-10-13 17:47:07,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-10-13 17:47:07,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2019-10-13 17:47:07,625 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 59 [2019-10-13 17:47:07,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:07,626 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2019-10-13 17:47:07,626 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-13 17:47:07,626 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2019-10-13 17:47:07,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-13 17:47:07,627 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:07,627 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:07,833 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:07,833 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:07,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:07,833 INFO L82 PathProgramCache]: Analyzing trace with hash 367873014, now seen corresponding path program 12 times [2019-10-13 17:47:07,833 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:07,834 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351102611] [2019-10-13 17:47:07,834 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:07,834 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:07,834 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:07,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:07,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:08,002 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-13 17:47:08,002 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351102611] [2019-10-13 17:47:08,003 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592750735] [2019-10-13 17:47:08,003 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 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 17:47:11,898 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-13 17:47:11,899 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:11,905 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 17:47:11,907 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:11,932 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-13 17:47:11,933 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:11,933 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-13 17:47:11,933 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163628981] [2019-10-13 17:47:11,934 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-13 17:47:11,934 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:11,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-13 17:47:11,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:47:11,935 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 17 states. [2019-10-13 17:47:12,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:12,077 INFO L93 Difference]: Finished difference Result 111 states and 116 transitions. [2019-10-13 17:47:12,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-13 17:47:12,077 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 63 [2019-10-13 17:47:12,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:12,078 INFO L225 Difference]: With dead ends: 111 [2019-10-13 17:47:12,078 INFO L226 Difference]: Without dead ends: 74 [2019-10-13 17:47:12,079 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:47:12,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-13 17:47:12,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2019-10-13 17:47:12,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-10-13 17:47:12,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2019-10-13 17:47:12,084 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 63 [2019-10-13 17:47:12,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:12,085 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2019-10-13 17:47:12,085 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-13 17:47:12,085 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2019-10-13 17:47:12,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-13 17:47:12,086 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:12,086 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:12,300 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:12,300 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:12,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:12,301 INFO L82 PathProgramCache]: Analyzing trace with hash -1060032398, now seen corresponding path program 13 times [2019-10-13 17:47:12,301 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:12,301 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931151127] [2019-10-13 17:47:12,302 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:12,302 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:12,302 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:12,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:12,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:12,482 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-13 17:47:12,483 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931151127] [2019-10-13 17:47:12,483 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113540582] [2019-10-13 17:47:12,483 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 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 17:47:12,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:12,537 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 17:47:12,539 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:12,567 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-13 17:47:12,568 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:12,568 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-13 17:47:12,568 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827704284] [2019-10-13 17:47:12,570 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-13 17:47:12,570 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:12,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-13 17:47:12,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:47:12,571 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 18 states. [2019-10-13 17:47:12,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:12,770 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2019-10-13 17:47:12,771 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 17:47:12,771 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 67 [2019-10-13 17:47:12,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:12,772 INFO L225 Difference]: With dead ends: 117 [2019-10-13 17:47:12,772 INFO L226 Difference]: Without dead ends: 78 [2019-10-13 17:47:12,774 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 68 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 17:47:12,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-13 17:47:12,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2019-10-13 17:47:12,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-13 17:47:12,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2019-10-13 17:47:12,784 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 67 [2019-10-13 17:47:12,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:12,784 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2019-10-13 17:47:12,784 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-13 17:47:12,786 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2019-10-13 17:47:12,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-10-13 17:47:12,787 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:12,787 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:12,994 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:12,994 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:12,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:12,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1741723922, now seen corresponding path program 14 times [2019-10-13 17:47:12,995 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:12,996 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305990761] [2019-10-13 17:47:12,996 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:12,996 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:12,996 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:13,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:13,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:13,175 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-10-13 17:47:13,175 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305990761] [2019-10-13 17:47:13,175 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085567271] [2019-10-13 17:47:13,175 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 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 17:47:13,235 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:47:13,236 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:13,237 INFO L256 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-13 17:47:13,238 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:13,267 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-10-13 17:47:13,269 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:13,273 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-13 17:47:13,274 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325061855] [2019-10-13 17:47:13,274 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-13 17:47:13,274 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:13,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-13 17:47:13,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:47:13,275 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 19 states. [2019-10-13 17:47:13,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:13,471 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2019-10-13 17:47:13,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-13 17:47:13,471 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 71 [2019-10-13 17:47:13,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:13,473 INFO L225 Difference]: With dead ends: 123 [2019-10-13 17:47:13,473 INFO L226 Difference]: Without dead ends: 82 [2019-10-13 17:47:13,474 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 72 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 17:47:13,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-10-13 17:47:13,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2019-10-13 17:47:13,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-10-13 17:47:13,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2019-10-13 17:47:13,478 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 71 [2019-10-13 17:47:13,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:13,479 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2019-10-13 17:47:13,479 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-13 17:47:13,479 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2019-10-13 17:47:13,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-13 17:47:13,480 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:13,480 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:13,683 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:13,684 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:13,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:13,684 INFO L82 PathProgramCache]: Analyzing trace with hash -1475154070, now seen corresponding path program 15 times [2019-10-13 17:47:13,685 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:13,685 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91922003] [2019-10-13 17:47:13,685 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:13,685 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:13,686 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:13,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:13,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:13,908 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-13 17:47:13,908 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91922003] [2019-10-13 17:47:13,909 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265797067] [2019-10-13 17:47:13,909 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 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 17:47:19,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-13 17:47:19,865 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:19,870 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-13 17:47:19,872 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:19,889 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-13 17:47:19,890 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:19,890 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-13 17:47:19,890 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441973934] [2019-10-13 17:47:19,891 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-13 17:47:19,891 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:19,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-13 17:47:19,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-13 17:47:19,892 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 20 states. [2019-10-13 17:47:20,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:20,086 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2019-10-13 17:47:20,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-13 17:47:20,086 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 75 [2019-10-13 17:47:20,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:20,087 INFO L225 Difference]: With dead ends: 129 [2019-10-13 17:47:20,087 INFO L226 Difference]: Without dead ends: 86 [2019-10-13 17:47:20,088 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-13 17:47:20,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-10-13 17:47:20,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2019-10-13 17:47:20,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-10-13 17:47:20,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2019-10-13 17:47:20,092 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 75 [2019-10-13 17:47:20,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:20,093 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2019-10-13 17:47:20,093 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-13 17:47:20,093 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2019-10-13 17:47:20,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-10-13 17:47:20,094 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:20,094 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:20,301 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:20,302 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:20,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:20,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1375286810, now seen corresponding path program 16 times [2019-10-13 17:47:20,303 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:20,303 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672484152] [2019-10-13 17:47:20,303 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:20,304 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:20,304 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:20,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:20,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:20,550 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-13 17:47:20,550 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672484152] [2019-10-13 17:47:20,551 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547120390] [2019-10-13 17:47:20,551 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 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 17:47:20,614 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:47:20,614 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:20,615 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-13 17:47:20,616 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:20,636 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-13 17:47:20,636 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:20,637 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-13 17:47:20,637 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813259878] [2019-10-13 17:47:20,637 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-13 17:47:20,638 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:20,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-13 17:47:20,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:47:20,638 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 21 states. [2019-10-13 17:47:20,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:20,849 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2019-10-13 17:47:20,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-13 17:47:20,849 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 79 [2019-10-13 17:47:20,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:20,851 INFO L225 Difference]: With dead ends: 135 [2019-10-13 17:47:20,851 INFO L226 Difference]: Without dead ends: 90 [2019-10-13 17:47:20,852 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 80 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 17:47:20,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-10-13 17:47:20,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2019-10-13 17:47:20,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-13 17:47:20,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2019-10-13 17:47:20,856 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 79 [2019-10-13 17:47:20,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:20,857 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2019-10-13 17:47:20,857 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-13 17:47:20,857 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2019-10-13 17:47:20,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-13 17:47:20,858 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:20,858 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:21,061 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:21,061 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:21,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:21,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1726613918, now seen corresponding path program 17 times [2019-10-13 17:47:21,062 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:21,062 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819694742] [2019-10-13 17:47:21,062 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:21,063 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:21,063 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:21,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:21,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:21,312 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-13 17:47:21,313 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819694742] [2019-10-13 17:47:21,313 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327746438] [2019-10-13 17:47:21,313 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 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 17:47:34,847 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-10-13 17:47:34,847 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:47:34,863 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-13 17:47:34,864 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:47:34,886 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-13 17:47:34,886 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:47:34,887 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-13 17:47:34,887 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14016373] [2019-10-13 17:47:34,888 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-13 17:47:34,888 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:47:34,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-13 17:47:34,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-13 17:47:34,889 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 22 states. [2019-10-13 17:47:35,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:47:35,058 INFO L93 Difference]: Finished difference Result 141 states and 146 transitions. [2019-10-13 17:47:35,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-13 17:47:35,058 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 83 [2019-10-13 17:47:35,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:47:35,059 INFO L225 Difference]: With dead ends: 141 [2019-10-13 17:47:35,059 INFO L226 Difference]: Without dead ends: 94 [2019-10-13 17:47:35,060 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-13 17:47:35,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-10-13 17:47:35,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2019-10-13 17:47:35,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-13 17:47:35,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2019-10-13 17:47:35,065 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 83 [2019-10-13 17:47:35,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:47:35,066 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2019-10-13 17:47:35,066 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-13 17:47:35,066 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2019-10-13 17:47:35,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-13 17:47:35,067 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:47:35,067 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:47:35,277 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:47:35,277 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:47:35,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:47:35,278 INFO L82 PathProgramCache]: Analyzing trace with hash 164328670, now seen corresponding path program 18 times [2019-10-13 17:47:35,278 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:47:35,278 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449670818] [2019-10-13 17:47:35,278 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:35,278 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:47:35,278 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:47:35,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:35,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:47:35,530 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2019-10-13 17:47:35,530 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449670818] [2019-10-13 17:47:35,530 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531993659] [2019-10-13 17:47:35,531 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 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