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 0.1.24-13a467a-m [2019-10-14 21:45:57,688 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:45:57,691 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:45:57,712 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:45:57,712 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:45:57,714 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:45:57,716 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:45:57,726 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:45:57,729 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:45:57,731 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:45:57,732 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:45:57,735 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:45:57,736 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:45:57,737 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:45:57,738 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:45:57,740 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:45:57,742 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:45:57,743 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:45:57,744 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:45:57,749 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:45:57,754 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:45:57,757 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:45:57,760 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:45:57,761 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:45:57,763 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-14 21:45:57,763 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-14 21:45:57,763 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-14 21:45:57,765 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-14 21:45:57,766 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-14 21:45:57,767 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-14 21:45:57,768 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:45:57,769 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:45:57,770 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:45:57,771 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:45:57,773 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:45:57,773 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:45:57,773 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:45:57,774 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:45:57,774 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:45:57,775 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:45:57,776 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:45:57,777 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 [2019-10-14 21:45:57,812 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:45:57,813 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:45:57,814 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:45:57,814 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:45:57,814 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:45:57,815 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:45:57,815 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:45:57,817 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:45:57,818 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:45:57,818 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:45:57,818 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:45:57,818 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:45:57,818 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:45:57,818 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:45:57,819 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:45:57,819 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:45:57,821 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:45:57,821 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:45:57,821 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:45:57,822 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:45:57,822 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:45:57,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:45:57,822 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:45:57,822 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:45:57,823 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:45:57,823 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:45:57,823 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:45:57,823 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:45:57,823 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:45:58,133 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:45:58,144 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:45:58,148 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:45:58,150 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:45:58,150 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:45:58,151 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-10-14 21:45:58,230 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f90e76a4f/a27602b5f2f04d9ea3332c560c5a5706/FLAG6f0295104 [2019-10-14 21:45:58,688 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:45:58,689 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-10-14 21:45:58,696 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f90e76a4f/a27602b5f2f04d9ea3332c560c5a5706/FLAG6f0295104 [2019-10-14 21:45:59,102 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f90e76a4f/a27602b5f2f04d9ea3332c560c5a5706 [2019-10-14 21:45:59,112 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:45:59,114 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:45:59,115 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:45:59,117 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:45:59,120 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:45:59,122 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:45:59" (1/1) ... [2019-10-14 21:45:59,126 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39f7fc14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59, skipping insertion in model container [2019-10-14 21:45:59,126 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:45:59" (1/1) ... [2019-10-14 21:45:59,134 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:45:59,152 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:45:59,306 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:45:59,310 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:45:59,329 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:45:59,350 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:45:59,350 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59 WrapperNode [2019-10-14 21:45:59,350 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:45:59,351 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:45:59,351 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:45:59,352 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:45:59,440 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59" (1/1) ... [2019-10-14 21:45:59,441 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59" (1/1) ... [2019-10-14 21:45:59,448 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59" (1/1) ... [2019-10-14 21:45:59,449 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59" (1/1) ... [2019-10-14 21:45:59,466 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59" (1/1) ... [2019-10-14 21:45:59,472 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59" (1/1) ... [2019-10-14 21:45:59,473 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59" (1/1) ... [2019-10-14 21:45:59,475 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:45:59,476 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:45:59,476 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:45:59,476 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:45:59,477 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59" (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 [2019-10-14 21:45:59,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:45:59,539 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:45:59,539 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:45:59,539 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:45:59,540 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:45:59,540 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:45:59,541 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:45:59,541 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:45:59,541 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:45:59,542 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:45:59,542 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:45:59,542 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:45:59,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:45:59,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:45:59,775 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:45:59,775 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-14 21:45:59,776 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:45:59 BoogieIcfgContainer [2019-10-14 21:45:59,777 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:45:59,778 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:45:59,778 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:45:59,781 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:45:59,782 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:45:59" (1/3) ... [2019-10-14 21:45:59,783 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41d8fc86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:45:59, skipping insertion in model container [2019-10-14 21:45:59,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:59" (2/3) ... [2019-10-14 21:45:59,783 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41d8fc86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:45:59, skipping insertion in model container [2019-10-14 21:45:59,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:45:59" (3/3) ... [2019-10-14 21:45:59,786 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2019-10-14 21:45:59,796 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:45:59,804 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:45:59,817 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:45:59,861 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:45:59,861 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:45:59,862 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:45:59,862 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:45:59,862 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:45:59,862 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:45:59,863 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:45:59,863 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:45:59,900 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-14 21:45:59,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:45:59,908 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:59,910 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:59,916 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:59,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:59,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1778002988, now seen corresponding path program 1 times [2019-10-14 21:45:59,933 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:59,934 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711764191] [2019-10-14 21:45:59,934 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:59,935 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:59,935 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:00,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:00,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:00,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:00,106 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711764191] [2019-10-14 21:46:00,107 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:46:00,108 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:46:00,108 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473861272] [2019-10-14 21:46:00,112 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:46:00,113 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:00,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:46:00,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:46:00,130 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-10-14 21:46:00,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:00,227 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2019-10-14 21:46:00,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:46:00,230 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-14 21:46:00,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:00,238 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:46:00,238 INFO L226 Difference]: Without dead ends: 22 [2019-10-14 21:46:00,241 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 [2019-10-14 21:46:00,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-14 21:46:00,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-14 21:46:00,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 21:46:00,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-10-14 21:46:00,277 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2019-10-14 21:46:00,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:00,278 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-10-14 21:46:00,278 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:46:00,279 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-10-14 21:46:00,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:46:00,280 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:00,280 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:00,280 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:00,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:00,281 INFO L82 PathProgramCache]: Analyzing trace with hash -262172122, now seen corresponding path program 1 times [2019-10-14 21:46:00,281 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:00,281 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684603160] [2019-10-14 21:46:00,282 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:00,282 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:00,282 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:00,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:00,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:00,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:00,356 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684603160] [2019-10-14 21:46:00,357 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:46:00,357 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:46:00,357 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660196108] [2019-10-14 21:46:00,359 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:46:00,359 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:00,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:46:00,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:46:00,360 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2019-10-14 21:46:00,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:00,462 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2019-10-14 21:46:00,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:46:00,463 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-14 21:46:00,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:00,464 INFO L225 Difference]: With dead ends: 40 [2019-10-14 21:46:00,464 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:46:00,466 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 [2019-10-14 21:46:00,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:46:00,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2019-10-14 21:46:00,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:46:00,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-14 21:46:00,479 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 15 [2019-10-14 21:46:00,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:00,480 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-14 21:46:00,480 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:46:00,481 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-14 21:46:00,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 21:46:00,482 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:00,483 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:00,484 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:00,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:00,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1323409058, now seen corresponding path program 1 times [2019-10-14 21:46:00,486 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:00,486 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493689287] [2019-10-14 21:46:00,487 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:00,487 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:00,487 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:00,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:00,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:00,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:46:00,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493689287] [2019-10-14 21:46:00,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575473896] [2019-10-14 21:46:00,623 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 [2019-10-14 21:46:00,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:00,674 INFO L256 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:46:00,680 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:00,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:46:00,730 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:00,730 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:46:00,731 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700472588] [2019-10-14 21:46:00,733 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:46:00,739 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:00,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:46:00,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:46:00,739 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 6 states. [2019-10-14 21:46:00,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:00,861 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-10-14 21:46:00,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:46:00,862 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2019-10-14 21:46:00,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:00,863 INFO L225 Difference]: With dead ends: 45 [2019-10-14 21:46:00,864 INFO L226 Difference]: Without dead ends: 30 [2019-10-14 21:46:00,864 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 [2019-10-14 21:46:00,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-14 21:46:00,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2019-10-14 21:46:00,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:46:00,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-10-14 21:46:00,871 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 19 [2019-10-14 21:46:00,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:00,872 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-10-14 21:46:00,872 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:46:00,872 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-10-14 21:46:00,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:46:00,873 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:00,873 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:01,084 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:01,085 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:01,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:01,085 INFO L82 PathProgramCache]: Analyzing trace with hash 1582955806, now seen corresponding path program 2 times [2019-10-14 21:46:01,086 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:01,086 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956686003] [2019-10-14 21:46:01,086 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:01,086 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:01,087 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:01,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:01,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:01,180 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:46:01,180 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956686003] [2019-10-14 21:46:01,181 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2082166337] [2019-10-14 21:46:01,181 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 [2019-10-14 21:46:01,237 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:46:01,237 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:01,238 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:46:01,240 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:01,269 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:46:01,269 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:01,270 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:46:01,271 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713084296] [2019-10-14 21:46:01,272 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:46:01,272 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:01,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:46:01,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:46:01,273 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 7 states. [2019-10-14 21:46:01,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:01,353 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2019-10-14 21:46:01,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:46:01,354 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-10-14 21:46:01,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:01,355 INFO L225 Difference]: With dead ends: 51 [2019-10-14 21:46:01,355 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 21:46:01,356 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 [2019-10-14 21:46:01,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 21:46:01,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-10-14 21:46:01,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-14 21:46:01,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-10-14 21:46:01,362 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 23 [2019-10-14 21:46:01,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:01,363 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-10-14 21:46:01,363 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:46:01,363 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-10-14 21:46:01,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 21:46:01,364 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:01,364 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:01,568 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:01,568 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:01,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:01,569 INFO L82 PathProgramCache]: Analyzing trace with hash -657216102, now seen corresponding path program 3 times [2019-10-14 21:46:01,570 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:01,570 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2032414161] [2019-10-14 21:46:01,571 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:01,571 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:01,571 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:01,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:01,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:01,692 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:46:01,693 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2032414161] [2019-10-14 21:46:01,694 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765493382] [2019-10-14 21:46:01,694 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 [2019-10-14 21:46:01,769 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-14 21:46:01,770 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:01,771 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:46:01,775 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:01,793 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:46:01,796 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:01,796 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 21:46:01,796 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838690871] [2019-10-14 21:46:01,797 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:46:01,797 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:01,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:46:01,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:46:01,799 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 8 states. [2019-10-14 21:46:01,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:01,886 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2019-10-14 21:46:01,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:46:01,886 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2019-10-14 21:46:01,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:01,887 INFO L225 Difference]: With dead ends: 57 [2019-10-14 21:46:01,887 INFO L226 Difference]: Without dead ends: 38 [2019-10-14 21:46:01,888 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 [2019-10-14 21:46:01,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-14 21:46:01,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2019-10-14 21:46:01,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-14 21:46:01,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-10-14 21:46:01,898 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2019-10-14 21:46:01,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:01,899 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-10-14 21:46:01,899 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:46:01,900 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-10-14 21:46:01,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-14 21:46:01,901 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:01,901 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:02,105 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:02,105 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:02,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:02,106 INFO L82 PathProgramCache]: Analyzing trace with hash 702132246, now seen corresponding path program 4 times [2019-10-14 21:46:02,106 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:02,107 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740658645] [2019-10-14 21:46:02,107 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:02,107 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:02,108 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:02,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:02,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:02,229 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:46:02,230 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740658645] [2019-10-14 21:46:02,230 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167987009] [2019-10-14 21:46:02,230 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 [2019-10-14 21:46:02,274 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:46:02,275 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:02,276 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:46:02,278 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:02,299 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:46:02,299 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:02,300 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:46:02,300 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150287760] [2019-10-14 21:46:02,300 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:46:02,300 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:02,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:46:02,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:46:02,301 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 9 states. [2019-10-14 21:46:02,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:02,433 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2019-10-14 21:46:02,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:46:02,434 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2019-10-14 21:46:02,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:02,435 INFO L225 Difference]: With dead ends: 63 [2019-10-14 21:46:02,435 INFO L226 Difference]: Without dead ends: 42 [2019-10-14 21:46:02,436 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 [2019-10-14 21:46:02,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-14 21:46:02,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-10-14 21:46:02,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:46:02,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-10-14 21:46:02,451 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2019-10-14 21:46:02,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:02,451 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-10-14 21:46:02,452 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:46:02,452 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-10-14 21:46:02,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:46:02,453 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:02,453 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:02,654 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:02,654 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:02,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:02,655 INFO L82 PathProgramCache]: Analyzing trace with hash -294189934, now seen corresponding path program 5 times [2019-10-14 21:46:02,655 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:02,655 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130755281] [2019-10-14 21:46:02,655 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:02,656 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:02,656 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:02,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:02,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:02,786 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:46:02,786 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130755281] [2019-10-14 21:46:02,787 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516908906] [2019-10-14 21:46:02,787 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 [2019-10-14 21:46:02,892 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-14 21:46:02,892 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:02,895 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:46:02,897 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:02,913 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:46:02,914 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:02,914 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:46:02,914 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368773343] [2019-10-14 21:46:02,915 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:46:02,915 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:02,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:46:02,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:46:02,916 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 10 states. [2019-10-14 21:46:03,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:03,042 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2019-10-14 21:46:03,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:46:03,042 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 35 [2019-10-14 21:46:03,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:03,043 INFO L225 Difference]: With dead ends: 69 [2019-10-14 21:46:03,044 INFO L226 Difference]: Without dead ends: 46 [2019-10-14 21:46:03,044 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 [2019-10-14 21:46:03,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-14 21:46:03,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2019-10-14 21:46:03,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-14 21:46:03,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-10-14 21:46:03,051 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 35 [2019-10-14 21:46:03,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:03,052 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-10-14 21:46:03,052 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:46:03,052 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-10-14 21:46:03,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 21:46:03,053 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:03,053 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:03,257 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:03,258 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:03,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:03,259 INFO L82 PathProgramCache]: Analyzing trace with hash 1966517006, now seen corresponding path program 6 times [2019-10-14 21:46:03,259 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:03,260 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866904340] [2019-10-14 21:46:03,260 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:03,260 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:03,261 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:03,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:03,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:03,398 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:46:03,398 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866904340] [2019-10-14 21:46:03,400 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860907161] [2019-10-14 21:46:03,400 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 [2019-10-14 21:46:03,499 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:46:03,500 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:03,501 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:46:03,504 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:03,528 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:46:03,528 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:03,528 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:46:03,529 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496940719] [2019-10-14 21:46:03,529 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:46:03,529 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:03,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:46:03,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:46:03,530 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2019-10-14 21:46:03,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:03,673 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2019-10-14 21:46:03,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:46:03,673 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2019-10-14 21:46:03,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:03,674 INFO L225 Difference]: With dead ends: 75 [2019-10-14 21:46:03,674 INFO L226 Difference]: Without dead ends: 50 [2019-10-14 21:46:03,675 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 [2019-10-14 21:46:03,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-14 21:46:03,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2019-10-14 21:46:03,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-14 21:46:03,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2019-10-14 21:46:03,686 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 39 [2019-10-14 21:46:03,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:03,686 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2019-10-14 21:46:03,686 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:46:03,686 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2019-10-14 21:46:03,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-14 21:46:03,689 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:03,689 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:03,893 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:03,894 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:03,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:03,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1042523018, now seen corresponding path program 7 times [2019-10-14 21:46:03,895 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:03,895 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755337131] [2019-10-14 21:46:03,895 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:03,896 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:03,896 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:03,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:04,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:04,014 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 21:46:04,015 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755337131] [2019-10-14 21:46:04,015 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374485877] [2019-10-14 21:46:04,015 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 [2019-10-14 21:46:04,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:04,064 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:46:04,066 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:04,094 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 21:46:04,095 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:04,095 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:46:04,095 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87925734] [2019-10-14 21:46:04,096 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:46:04,096 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:04,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:46:04,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:46:04,097 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 12 states. [2019-10-14 21:46:04,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:04,226 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2019-10-14 21:46:04,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:46:04,227 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 43 [2019-10-14 21:46:04,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:04,228 INFO L225 Difference]: With dead ends: 81 [2019-10-14 21:46:04,228 INFO L226 Difference]: Without dead ends: 54 [2019-10-14 21:46:04,228 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:46:04,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-14 21:46:04,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-10-14 21:46:04,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:46:04,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-10-14 21:46:04,234 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 43 [2019-10-14 21:46:04,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:04,235 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-10-14 21:46:04,235 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:46:04,235 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-10-14 21:46:04,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:46:04,236 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:04,236 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:04,440 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:04,440 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:04,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:04,441 INFO L82 PathProgramCache]: Analyzing trace with hash 2059988486, now seen corresponding path program 8 times [2019-10-14 21:46:04,441 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:04,441 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014005854] [2019-10-14 21:46:04,442 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:04,442 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:04,442 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:04,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:04,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:04,568 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-14 21:46:04,568 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014005854] [2019-10-14 21:46:04,568 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470807394] [2019-10-14 21:46:04,569 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 [2019-10-14 21:46:04,616 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:46:04,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:04,618 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:46:04,620 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:04,637 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-14 21:46:04,637 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:04,638 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:46:04,638 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770816392] [2019-10-14 21:46:04,638 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:46:04,639 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:04,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:46:04,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:46:04,639 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 13 states. [2019-10-14 21:46:04,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:04,771 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2019-10-14 21:46:04,771 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:46:04,772 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 47 [2019-10-14 21:46:04,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:04,772 INFO L225 Difference]: With dead ends: 87 [2019-10-14 21:46:04,773 INFO L226 Difference]: Without dead ends: 58 [2019-10-14 21:46:04,773 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 [2019-10-14 21:46:04,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-14 21:46:04,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2019-10-14 21:46:04,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-14 21:46:04,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-10-14 21:46:04,780 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 47 [2019-10-14 21:46:04,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:04,780 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-10-14 21:46:04,780 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:46:04,780 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-10-14 21:46:04,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 21:46:04,781 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:04,781 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:04,985 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:04,985 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:04,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:04,986 INFO L82 PathProgramCache]: Analyzing trace with hash -1909355902, now seen corresponding path program 9 times [2019-10-14 21:46:04,986 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:04,987 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689010122] [2019-10-14 21:46:04,987 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:04,987 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:04,987 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:05,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:05,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:05,137 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:46:05,138 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689010122] [2019-10-14 21:46:05,138 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592181772] [2019-10-14 21:46:05,138 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 [2019-10-14 21:46:05,596 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-14 21:46:05,596 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:05,598 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:46:05,600 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:05,624 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:46:05,624 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:05,624 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 21:46:05,624 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489880217] [2019-10-14 21:46:05,625 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:46:05,625 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:05,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:46:05,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:46:05,626 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 14 states. [2019-10-14 21:46:05,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:05,735 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2019-10-14 21:46:05,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:46:05,735 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 51 [2019-10-14 21:46:05,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:05,736 INFO L225 Difference]: With dead ends: 93 [2019-10-14 21:46:05,736 INFO L226 Difference]: Without dead ends: 62 [2019-10-14 21:46:05,737 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 [2019-10-14 21:46:05,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-14 21:46:05,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2019-10-14 21:46:05,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-14 21:46:05,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-10-14 21:46:05,743 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 51 [2019-10-14 21:46:05,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:05,743 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-10-14 21:46:05,743 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:46:05,743 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-10-14 21:46:05,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-14 21:46:05,744 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:05,745 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:05,954 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:05,954 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:05,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:05,955 INFO L82 PathProgramCache]: Analyzing trace with hash -1930921730, now seen corresponding path program 10 times [2019-10-14 21:46:05,956 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:05,956 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674564339] [2019-10-14 21:46:05,956 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:05,957 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:05,957 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:05,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:06,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:06,097 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:46:06,097 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674564339] [2019-10-14 21:46:06,098 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162128076] [2019-10-14 21:46:06,098 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 [2019-10-14 21:46:06,158 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:46:06,158 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:06,159 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:46:06,162 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:06,186 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:46:06,187 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:06,187 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:46:06,187 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66072984] [2019-10-14 21:46:06,188 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:46:06,188 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:06,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:46:06,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:46:06,189 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 15 states. [2019-10-14 21:46:06,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:06,366 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2019-10-14 21:46:06,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:46:06,366 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 55 [2019-10-14 21:46:06,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:06,367 INFO L225 Difference]: With dead ends: 99 [2019-10-14 21:46:06,367 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 21:46:06,368 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:46:06,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 21:46:06,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2019-10-14 21:46:06,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 21:46:06,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-10-14 21:46:06,374 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 55 [2019-10-14 21:46:06,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:06,374 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-10-14 21:46:06,374 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:46:06,375 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-10-14 21:46:06,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-14 21:46:06,376 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:06,376 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:06,584 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:06,585 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:06,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:06,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1124550278, now seen corresponding path program 11 times [2019-10-14 21:46:06,585 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:06,586 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526471945] [2019-10-14 21:46:06,586 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:06,586 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:06,586 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:06,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:06,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:06,749 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 21:46:06,750 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526471945] [2019-10-14 21:46:06,750 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771918156] [2019-10-14 21:46:06,750 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 [2019-10-14 21:46:07,403 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-14 21:46:07,404 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:07,407 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:46:07,410 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:07,440 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 21:46:07,440 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:07,440 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:46:07,440 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261375844] [2019-10-14 21:46:07,444 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:46:07,444 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:07,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:46:07,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:46:07,445 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 16 states. [2019-10-14 21:46:07,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:07,554 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2019-10-14 21:46:07,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:46:07,554 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 59 [2019-10-14 21:46:07,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:07,555 INFO L225 Difference]: With dead ends: 105 [2019-10-14 21:46:07,555 INFO L226 Difference]: Without dead ends: 70 [2019-10-14 21:46:07,556 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:46:07,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-14 21:46:07,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2019-10-14 21:46:07,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-10-14 21:46:07,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2019-10-14 21:46:07,562 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 59 [2019-10-14 21:46:07,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:07,563 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2019-10-14 21:46:07,563 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:46:07,563 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2019-10-14 21:46:07,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 21:46:07,564 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:07,564 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:07,770 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:07,770 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:07,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:07,771 INFO L82 PathProgramCache]: Analyzing trace with hash 367873014, now seen corresponding path program 12 times [2019-10-14 21:46:07,772 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:07,772 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053411715] [2019-10-14 21:46:07,772 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:07,772 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:07,773 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:07,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:07,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:07,927 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-14 21:46:07,928 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053411715] [2019-10-14 21:46:07,928 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644125753] [2019-10-14 21:46:07,928 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 [2019-10-14 21:46:11,696 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-14 21:46:11,696 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:11,702 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:46:11,704 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:11,729 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-14 21:46:11,729 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:11,729 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-14 21:46:11,729 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808469992] [2019-10-14 21:46:11,730 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:46:11,730 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:11,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:46:11,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:46:11,731 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 17 states. [2019-10-14 21:46:11,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:11,862 INFO L93 Difference]: Finished difference Result 111 states and 116 transitions. [2019-10-14 21:46:11,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 21:46:11,863 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 63 [2019-10-14 21:46:11,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:11,864 INFO L225 Difference]: With dead ends: 111 [2019-10-14 21:46:11,864 INFO L226 Difference]: Without dead ends: 74 [2019-10-14 21:46:11,865 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 [2019-10-14 21:46:11,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-14 21:46:11,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2019-10-14 21:46:11,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-10-14 21:46:11,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2019-10-14 21:46:11,871 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 63 [2019-10-14 21:46:11,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:11,872 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2019-10-14 21:46:11,872 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:46:11,872 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2019-10-14 21:46:11,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-14 21:46:11,873 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:11,873 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:12,080 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:12,081 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:12,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:12,081 INFO L82 PathProgramCache]: Analyzing trace with hash -1060032398, now seen corresponding path program 13 times [2019-10-14 21:46:12,081 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:12,082 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059630237] [2019-10-14 21:46:12,082 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:12,082 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:12,083 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:12,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:12,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:12,279 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-14 21:46:12,279 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059630237] [2019-10-14 21:46:12,280 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256550379] [2019-10-14 21:46:12,280 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 [2019-10-14 21:46:12,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:12,332 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:46:12,333 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:12,362 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-14 21:46:12,363 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:12,363 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:46:12,363 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423689073] [2019-10-14 21:46:12,364 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:46:12,364 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:12,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:46:12,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:46:12,365 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 18 states. [2019-10-14 21:46:12,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:12,533 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2019-10-14 21:46:12,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:46:12,534 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 67 [2019-10-14 21:46:12,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:12,535 INFO L225 Difference]: With dead ends: 117 [2019-10-14 21:46:12,535 INFO L226 Difference]: Without dead ends: 78 [2019-10-14 21:46:12,536 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 [2019-10-14 21:46:12,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-14 21:46:12,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2019-10-14 21:46:12,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-14 21:46:12,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2019-10-14 21:46:12,541 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 67 [2019-10-14 21:46:12,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:12,541 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2019-10-14 21:46:12,541 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:46:12,541 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2019-10-14 21:46:12,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-10-14 21:46:12,542 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:12,542 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:12,746 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:12,747 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:12,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:12,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1741723922, now seen corresponding path program 14 times [2019-10-14 21:46:12,748 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:12,748 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029872822] [2019-10-14 21:46:12,748 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:12,749 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:12,749 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:12,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:12,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:12,941 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-10-14 21:46:12,942 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029872822] [2019-10-14 21:46:12,942 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969155645] [2019-10-14 21:46:12,942 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 [2019-10-14 21:46:13,020 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:46:13,020 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:13,022 INFO L256 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:46:13,024 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:13,045 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-10-14 21:46:13,045 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:13,046 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:46:13,046 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333838986] [2019-10-14 21:46:13,046 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:46:13,047 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:13,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:46:13,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:46:13,047 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 19 states. [2019-10-14 21:46:13,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:13,269 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2019-10-14 21:46:13,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:46:13,270 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 71 [2019-10-14 21:46:13,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:13,271 INFO L225 Difference]: With dead ends: 123 [2019-10-14 21:46:13,271 INFO L226 Difference]: Without dead ends: 82 [2019-10-14 21:46:13,272 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 [2019-10-14 21:46:13,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-10-14 21:46:13,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2019-10-14 21:46:13,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-10-14 21:46:13,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2019-10-14 21:46:13,282 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 71 [2019-10-14 21:46:13,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:13,282 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2019-10-14 21:46:13,283 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:46:13,283 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2019-10-14 21:46:13,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-14 21:46:13,284 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:13,284 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:13,485 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:13,485 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:13,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:13,485 INFO L82 PathProgramCache]: Analyzing trace with hash -1475154070, now seen corresponding path program 15 times [2019-10-14 21:46:13,485 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:13,485 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33808885] [2019-10-14 21:46:13,486 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:13,486 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:13,486 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:13,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:13,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:13,718 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-14 21:46:13,719 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33808885] [2019-10-14 21:46:13,719 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089697881] [2019-10-14 21:46:13,719 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 [2019-10-14 21:46:19,566 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-14 21:46:19,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:19,571 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:46:19,573 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:19,605 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-14 21:46:19,606 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:19,606 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:46:19,606 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034168334] [2019-10-14 21:46:19,607 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:46:19,607 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:19,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:46:19,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:46:19,609 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 20 states. [2019-10-14 21:46:19,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:19,766 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2019-10-14 21:46:19,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:46:19,766 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 75 [2019-10-14 21:46:19,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:19,767 INFO L225 Difference]: With dead ends: 129 [2019-10-14 21:46:19,767 INFO L226 Difference]: Without dead ends: 86 [2019-10-14 21:46:19,768 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 [2019-10-14 21:46:19,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-10-14 21:46:19,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2019-10-14 21:46:19,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-10-14 21:46:19,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2019-10-14 21:46:19,773 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 75 [2019-10-14 21:46:19,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:19,773 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2019-10-14 21:46:19,773 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:46:19,773 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2019-10-14 21:46:19,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-10-14 21:46:19,774 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:19,774 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:19,979 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:19,980 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:19,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:19,981 INFO L82 PathProgramCache]: Analyzing trace with hash -1375286810, now seen corresponding path program 16 times [2019-10-14 21:46:19,981 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:19,981 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810501116] [2019-10-14 21:46:19,982 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:19,982 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:19,982 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:20,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:20,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:20,197 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-14 21:46:20,197 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810501116] [2019-10-14 21:46:20,197 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1642646855] [2019-10-14 21:46:20,198 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 [2019-10-14 21:46:20,259 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:46:20,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:20,260 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:46:20,262 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:20,305 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-14 21:46:20,306 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:20,306 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:46:20,306 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362942497] [2019-10-14 21:46:20,307 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:46:20,307 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:20,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:46:20,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:46:20,308 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 21 states. [2019-10-14 21:46:20,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:20,533 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2019-10-14 21:46:20,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:46:20,533 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 79 [2019-10-14 21:46:20,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:20,534 INFO L225 Difference]: With dead ends: 135 [2019-10-14 21:46:20,534 INFO L226 Difference]: Without dead ends: 90 [2019-10-14 21:46:20,535 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 [2019-10-14 21:46:20,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-10-14 21:46:20,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2019-10-14 21:46:20,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-14 21:46:20,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2019-10-14 21:46:20,540 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 79 [2019-10-14 21:46:20,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:20,540 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2019-10-14 21:46:20,540 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:46:20,540 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2019-10-14 21:46:20,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-14 21:46:20,541 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:20,541 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:20,745 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:20,746 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:20,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:20,746 INFO L82 PathProgramCache]: Analyzing trace with hash -1726613918, now seen corresponding path program 17 times [2019-10-14 21:46:20,747 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:20,747 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253388909] [2019-10-14 21:46:20,747 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:20,748 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:20,748 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:20,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:20,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:20,947 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-14 21:46:20,948 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253388909] [2019-10-14 21:46:20,948 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64793117] [2019-10-14 21:46:20,948 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 [2019-10-14 21:46:34,756 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-10-14 21:46:34,757 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:34,773 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:46:34,774 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:34,796 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-14 21:46:34,797 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:34,797 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-14 21:46:34,797 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001158089] [2019-10-14 21:46:34,799 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:46:34,799 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:34,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:46:34,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:46:34,800 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 22 states. [2019-10-14 21:46:34,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:34,974 INFO L93 Difference]: Finished difference Result 141 states and 146 transitions. [2019-10-14 21:46:34,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:46:34,974 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 83 [2019-10-14 21:46:34,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:34,975 INFO L225 Difference]: With dead ends: 141 [2019-10-14 21:46:34,975 INFO L226 Difference]: Without dead ends: 94 [2019-10-14 21:46:34,976 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:46:34,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-10-14 21:46:34,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2019-10-14 21:46:34,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-14 21:46:34,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2019-10-14 21:46:34,980 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 83 [2019-10-14 21:46:34,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:34,980 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2019-10-14 21:46:34,980 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:46:34,981 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2019-10-14 21:46:34,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-14 21:46:34,981 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:34,982 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:35,182 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:35,183 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:35,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:35,183 INFO L82 PathProgramCache]: Analyzing trace with hash 164328670, now seen corresponding path program 18 times [2019-10-14 21:46:35,183 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:35,184 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42230883] [2019-10-14 21:46:35,184 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:35,184 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:35,184 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:35,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:35,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:35,431 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2019-10-14 21:46:35,432 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42230883] [2019-10-14 21:46:35,432 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614166158] [2019-10-14 21:46:35,432 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