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_init3_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:44:59,622 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:44:59,625 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:44:59,639 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:44:59,640 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:44:59,641 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:44:59,642 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:44:59,644 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:44:59,645 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:44:59,646 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:44:59,647 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:44:59,648 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:44:59,649 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:44:59,650 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:44:59,651 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:44:59,652 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:44:59,653 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:44:59,654 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:44:59,655 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:44:59,657 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:44:59,659 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:44:59,660 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:44:59,661 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:44:59,662 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:44:59,664 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:44:59,667 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:44:59,668 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:44:59,668 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:44:59,669 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:44:59,670 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:44:59,671 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:44:59,671 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:44:59,672 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:44:59,672 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:44:59,673 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:44:59,673 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:44:59,674 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 21:44:59,689 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:44:59,689 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:44:59,690 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:44:59,690 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:44:59,691 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:44:59,691 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:44:59,691 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:44:59,691 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:44:59,691 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:44:59,692 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:44:59,692 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:44:59,692 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:44:59,692 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:44:59,692 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:44:59,693 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:44:59,693 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:44:59,693 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:44:59,693 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:44:59,693 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:44:59,694 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:44:59,694 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:44:59,694 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:44:59,694 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:44:59,694 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:44:59,695 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:44:59,695 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:44:59,695 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:44:59,695 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:44:59,696 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:45:00,024 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:45:00,048 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:45:00,052 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:45:00,053 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:45:00,054 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:45:00,055 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_init3_ground-2.i [2019-10-14 21:45:00,125 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d365ccc3c/2a1e358dbcdd463da4052ea855f11974/FLAG92ebe06a4 [2019-10-14 21:45:00,553 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:45:00,554 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_init3_ground-2.i [2019-10-14 21:45:00,561 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d365ccc3c/2a1e358dbcdd463da4052ea855f11974/FLAG92ebe06a4 [2019-10-14 21:45:00,967 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d365ccc3c/2a1e358dbcdd463da4052ea855f11974 [2019-10-14 21:45:00,983 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:45:00,985 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:45:00,986 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:45:00,986 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:45:00,990 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:45:00,991 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:45:00" (1/1) ... [2019-10-14 21:45:00,994 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34feea5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:00, skipping insertion in model container [2019-10-14 21:45:00,994 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:45:00" (1/1) ... [2019-10-14 21:45:01,002 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:45:01,022 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:45:01,256 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:45:01,273 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:45:01,302 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:45:01,321 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:45:01,322 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01 WrapperNode [2019-10-14 21:45:01,322 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:45:01,323 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:45:01,323 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:45:01,323 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:45:01,417 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01" (1/1) ... [2019-10-14 21:45:01,418 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01" (1/1) ... [2019-10-14 21:45:01,425 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01" (1/1) ... [2019-10-14 21:45:01,427 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01" (1/1) ... [2019-10-14 21:45:01,441 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01" (1/1) ... [2019-10-14 21:45:01,447 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01" (1/1) ... [2019-10-14 21:45:01,448 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01" (1/1) ... [2019-10-14 21:45:01,450 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:45:01,450 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:45:01,451 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:45:01,451 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:45:01,452 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01" (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 21:45:01,510 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:45:01,511 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:45:01,511 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:45:01,511 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:45:01,511 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:45:01,511 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:45:01,512 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:45:01,512 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:45:01,512 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:45:01,512 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:45:01,512 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:45:01,512 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:45:01,513 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:45:01,743 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:45:01,745 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-14 21:45:01,748 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:45:01 BoogieIcfgContainer [2019-10-14 21:45:01,748 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:45:01,750 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:45:01,750 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:45:01,755 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:45:01,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:45:00" (1/3) ... [2019-10-14 21:45:01,757 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7831b01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:45:01, skipping insertion in model container [2019-10-14 21:45:01,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:45:01" (2/3) ... [2019-10-14 21:45:01,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7831b01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:45:01, skipping insertion in model container [2019-10-14 21:45:01,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:45:01" (3/3) ... [2019-10-14 21:45:01,762 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_init3_ground-2.i [2019-10-14 21:45:01,796 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:45:01,814 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:45:01,846 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:45:01,875 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:45:01,875 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:45:01,875 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:45:01,875 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:45:01,876 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:45:01,876 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:45:01,876 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:45:01,876 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:45:01,891 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-14 21:45:01,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:45:01,897 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:01,898 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:01,900 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:01,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:01,905 INFO L82 PathProgramCache]: Analyzing trace with hash 578824766, now seen corresponding path program 1 times [2019-10-14 21:45:01,912 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:01,912 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401672972] [2019-10-14 21:45:01,912 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:01,913 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:01,913 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:02,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:02,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:02,078 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 21:45:02,079 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401672972] [2019-10-14 21:45:02,080 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:45:02,080 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:45:02,080 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630053297] [2019-10-14 21:45:02,084 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:45:02,085 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:02,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:45:02,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:45:02,098 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-10-14 21:45:02,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:02,221 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2019-10-14 21:45:02,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:45:02,223 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-14 21:45:02,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:02,231 INFO L225 Difference]: With dead ends: 47 [2019-10-14 21:45:02,231 INFO L226 Difference]: Without dead ends: 22 [2019-10-14 21:45:02,234 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 21:45:02,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-14 21:45:02,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-14 21:45:02,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 21:45:02,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-10-14 21:45:02,269 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 17 [2019-10-14 21:45:02,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:02,270 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-10-14 21:45:02,270 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:45:02,270 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-10-14 21:45:02,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:45:02,271 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:02,272 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:02,272 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:02,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:02,273 INFO L82 PathProgramCache]: Analyzing trace with hash -823304390, now seen corresponding path program 1 times [2019-10-14 21:45:02,273 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:02,273 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359920049] [2019-10-14 21:45:02,273 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:02,274 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:02,274 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:02,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:02,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:02,348 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 21:45:02,348 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359920049] [2019-10-14 21:45:02,348 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:45:02,349 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:45:02,349 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370377391] [2019-10-14 21:45:02,351 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:45:02,351 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:02,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:45:02,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:45:02,352 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 4 states. [2019-10-14 21:45:02,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:02,446 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2019-10-14 21:45:02,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:45:02,447 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-14 21:45:02,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:02,448 INFO L225 Difference]: With dead ends: 40 [2019-10-14 21:45:02,449 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 21:45:02,450 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 21:45:02,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 21:45:02,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-10-14 21:45:02,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-14 21:45:02,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2019-10-14 21:45:02,466 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 17 [2019-10-14 21:45:02,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:02,467 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2019-10-14 21:45:02,467 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:45:02,467 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2019-10-14 21:45:02,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:45:02,469 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:02,470 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:02,470 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:02,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:02,471 INFO L82 PathProgramCache]: Analyzing trace with hash 3753729, now seen corresponding path program 1 times [2019-10-14 21:45:02,472 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:02,473 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450315811] [2019-10-14 21:45:02,473 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:02,473 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:02,473 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:02,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:02,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:02,611 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:45:02,612 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450315811] [2019-10-14 21:45:02,612 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854093283] [2019-10-14 21:45:02,612 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 21:45:02,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:02,678 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:45:02,690 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:02,727 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:45:02,727 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:02,727 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:45:02,728 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375872892] [2019-10-14 21:45:02,729 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:45:02,730 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:02,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:45:02,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:45:02,737 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 6 states. [2019-10-14 21:45:02,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:02,838 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2019-10-14 21:45:02,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:45:02,839 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-10-14 21:45:02,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:02,840 INFO L225 Difference]: With dead ends: 45 [2019-10-14 21:45:02,840 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 21:45:02,841 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 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 21:45:02,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 21:45:02,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-14 21:45:02,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:45:02,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2019-10-14 21:45:02,848 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 20 [2019-10-14 21:45:02,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:02,849 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2019-10-14 21:45:02,849 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:45:02,849 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2019-10-14 21:45:02,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:45:02,850 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:02,851 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:03,056 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:03,056 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:03,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:03,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1185149478, now seen corresponding path program 2 times [2019-10-14 21:45:03,058 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:03,059 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194855930] [2019-10-14 21:45:03,059 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,060 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,060 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:03,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,166 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:45:03,167 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194855930] [2019-10-14 21:45:03,167 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221101140] [2019-10-14 21:45:03,167 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 21:45:03,230 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:45:03,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:03,231 INFO L256 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:45:03,233 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:03,260 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:45:03,261 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:03,261 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:45:03,261 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360500311] [2019-10-14 21:45:03,262 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:45:03,262 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:03,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:45:03,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:45:03,263 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 7 states. [2019-10-14 21:45:03,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:03,370 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2019-10-14 21:45:03,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:45:03,371 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-10-14 21:45:03,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:03,372 INFO L225 Difference]: With dead ends: 50 [2019-10-14 21:45:03,374 INFO L226 Difference]: Without dead ends: 31 [2019-10-14 21:45:03,375 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 21:45:03,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-14 21:45:03,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-14 21:45:03,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-14 21:45:03,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2019-10-14 21:45:03,388 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 23 [2019-10-14 21:45:03,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:03,388 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2019-10-14 21:45:03,389 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:45:03,389 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2019-10-14 21:45:03,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-14 21:45:03,392 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:03,392 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:03,593 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:03,594 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:03,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:03,595 INFO L82 PathProgramCache]: Analyzing trace with hash 455820257, now seen corresponding path program 3 times [2019-10-14 21:45:03,595 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:03,595 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923167855] [2019-10-14 21:45:03,596 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,596 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,596 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:03,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,696 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 21:45:03,696 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923167855] [2019-10-14 21:45:03,697 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028063762] [2019-10-14 21:45:03,697 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 21:45:03,758 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:45:03,758 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:03,759 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:45:03,763 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:03,787 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 21:45:03,788 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:03,788 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 21:45:03,788 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194026396] [2019-10-14 21:45:03,789 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:45:03,789 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:03,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:45:03,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:45:03,791 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 8 states. [2019-10-14 21:45:03,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:03,908 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2019-10-14 21:45:03,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:45:03,908 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2019-10-14 21:45:03,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:03,909 INFO L225 Difference]: With dead ends: 55 [2019-10-14 21:45:03,910 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 21:45:03,910 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 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 21:45:03,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 21:45:03,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-10-14 21:45:03,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:45:03,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-10-14 21:45:03,924 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2019-10-14 21:45:03,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:03,925 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-10-14 21:45:03,926 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:45:03,926 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-10-14 21:45:03,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 21:45:03,927 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:03,932 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:04,137 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:04,138 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:04,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:04,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1002382458, now seen corresponding path program 4 times [2019-10-14 21:45:04,139 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:04,139 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178533509] [2019-10-14 21:45:04,139 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,140 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,140 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:04,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,255 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-10-14 21:45:04,256 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178533509] [2019-10-14 21:45:04,256 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145649816] [2019-10-14 21:45:04,256 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 21:45:04,300 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:45:04,300 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:04,302 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:45:04,304 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:04,317 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-10-14 21:45:04,318 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:04,318 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:45:04,318 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761269997] [2019-10-14 21:45:04,319 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:45:04,319 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:04,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:45:04,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:45:04,320 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 9 states. [2019-10-14 21:45:04,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:04,446 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2019-10-14 21:45:04,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:45:04,447 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2019-10-14 21:45:04,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:04,448 INFO L225 Difference]: With dead ends: 60 [2019-10-14 21:45:04,448 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 21:45:04,449 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 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 21:45:04,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 21:45:04,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-10-14 21:45:04,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-14 21:45:04,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2019-10-14 21:45:04,455 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 29 [2019-10-14 21:45:04,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:04,455 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2019-10-14 21:45:04,455 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:45:04,456 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2019-10-14 21:45:04,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 21:45:04,456 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:04,457 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:04,665 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:04,666 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:04,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:04,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1395779391, now seen corresponding path program 5 times [2019-10-14 21:45:04,668 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:04,668 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070999730] [2019-10-14 21:45:04,668 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,669 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,669 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:04,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,819 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 21:45:04,819 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070999730] [2019-10-14 21:45:04,820 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455073157] [2019-10-14 21:45:04,820 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 21:45:04,991 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-14 21:45:04,991 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:04,993 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:45:04,995 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:05,016 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 21:45:05,017 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:05,017 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:45:05,018 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146761236] [2019-10-14 21:45:05,019 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:45:05,020 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:05,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:45:05,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:45:05,021 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 10 states. [2019-10-14 21:45:05,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:05,148 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2019-10-14 21:45:05,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:45:05,149 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2019-10-14 21:45:05,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:05,150 INFO L225 Difference]: With dead ends: 65 [2019-10-14 21:45:05,150 INFO L226 Difference]: Without dead ends: 40 [2019-10-14 21:45:05,151 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 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 21:45:05,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-14 21:45:05,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-10-14 21:45:05,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:45:05,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2019-10-14 21:45:05,158 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2019-10-14 21:45:05,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:05,158 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2019-10-14 21:45:05,159 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:45:05,159 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2019-10-14 21:45:05,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:45:05,160 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:05,160 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:05,362 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:05,363 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:05,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:05,364 INFO L82 PathProgramCache]: Analyzing trace with hash 1957995290, now seen corresponding path program 6 times [2019-10-14 21:45:05,365 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:05,365 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881680758] [2019-10-14 21:45:05,365 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:05,366 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:05,366 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:05,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:05,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:05,486 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-14 21:45:05,487 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881680758] [2019-10-14 21:45:05,487 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021743984] [2019-10-14 21:45:05,487 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 21:45:05,574 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-10-14 21:45:05,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:05,576 INFO L256 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:45:05,578 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:05,604 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-14 21:45:05,604 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:05,604 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:45:05,605 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614141437] [2019-10-14 21:45:05,606 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:45:05,606 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:05,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:45:05,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:45:05,610 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 11 states. [2019-10-14 21:45:05,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:05,712 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2019-10-14 21:45:05,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:45:05,713 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2019-10-14 21:45:05,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:05,714 INFO L225 Difference]: With dead ends: 70 [2019-10-14 21:45:05,714 INFO L226 Difference]: Without dead ends: 43 [2019-10-14 21:45:05,715 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 36 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 21:45:05,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-14 21:45:05,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-10-14 21:45:05,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 21:45:05,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2019-10-14 21:45:05,721 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 35 [2019-10-14 21:45:05,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:05,722 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2019-10-14 21:45:05,722 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:45:05,722 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2019-10-14 21:45:05,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-14 21:45:05,723 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:05,723 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:05,926 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:05,927 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:05,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:05,928 INFO L82 PathProgramCache]: Analyzing trace with hash -1474050655, now seen corresponding path program 7 times [2019-10-14 21:45:05,929 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:05,929 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146632269] [2019-10-14 21:45:05,929 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:05,930 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:05,930 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:05,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:06,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:06,029 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-14 21:45:06,029 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146632269] [2019-10-14 21:45:06,029 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569245444] [2019-10-14 21:45:06,029 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 21:45:06,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:06,090 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:45:06,092 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:06,116 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-14 21:45:06,117 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:06,117 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:45:06,117 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829189003] [2019-10-14 21:45:06,118 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:45:06,118 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:06,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:45:06,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:45:06,119 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 12 states. [2019-10-14 21:45:06,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:06,235 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2019-10-14 21:45:06,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:45:06,236 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2019-10-14 21:45:06,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:06,237 INFO L225 Difference]: With dead ends: 75 [2019-10-14 21:45:06,237 INFO L226 Difference]: Without dead ends: 46 [2019-10-14 21:45:06,238 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 39 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 21:45:06,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-14 21:45:06,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-10-14 21:45:06,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 21:45:06,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-10-14 21:45:06,244 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 38 [2019-10-14 21:45:06,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:06,244 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-10-14 21:45:06,244 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:45:06,244 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-10-14 21:45:06,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-14 21:45:06,245 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:06,245 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:06,449 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:06,449 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:06,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:06,450 INFO L82 PathProgramCache]: Analyzing trace with hash 2136639930, now seen corresponding path program 8 times [2019-10-14 21:45:06,450 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:06,451 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042296276] [2019-10-14 21:45:06,451 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:06,451 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:06,451 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:06,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:06,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:06,593 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-10-14 21:45:06,595 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042296276] [2019-10-14 21:45:06,596 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946143239] [2019-10-14 21:45:06,596 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 21:45:06,653 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:45:06,653 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:06,654 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:45:06,657 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:06,679 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-10-14 21:45:06,679 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:06,679 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:45:06,680 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152143576] [2019-10-14 21:45:06,680 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:45:06,680 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:06,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:45:06,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:45:06,681 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 13 states. [2019-10-14 21:45:06,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:06,783 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2019-10-14 21:45:06,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:45:06,784 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2019-10-14 21:45:06,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:06,785 INFO L225 Difference]: With dead ends: 80 [2019-10-14 21:45:06,785 INFO L226 Difference]: Without dead ends: 49 [2019-10-14 21:45:06,786 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 42 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 21:45:06,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-14 21:45:06,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-10-14 21:45:06,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-14 21:45:06,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2019-10-14 21:45:06,802 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 41 [2019-10-14 21:45:06,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:06,802 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2019-10-14 21:45:06,802 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:45:06,802 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2019-10-14 21:45:06,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 21:45:06,803 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:06,803 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:07,006 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:07,007 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:07,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:07,008 INFO L82 PathProgramCache]: Analyzing trace with hash -1548858751, now seen corresponding path program 9 times [2019-10-14 21:45:07,008 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:07,008 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802443258] [2019-10-14 21:45:07,008 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:07,009 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:07,009 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:07,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:07,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:07,147 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2019-10-14 21:45:07,148 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802443258] [2019-10-14 21:45:07,148 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563101391] [2019-10-14 21:45:07,148 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 21:45:07,489 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:45:07,490 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:07,492 INFO L256 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:45:07,494 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:07,525 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 9 proven. 45 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:45:07,525 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:07,525 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 15 [2019-10-14 21:45:07,526 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431697491] [2019-10-14 21:45:07,526 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:45:07,526 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:07,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:45:07,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:45:07,527 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2019-10-14 21:45:07,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:07,657 INFO L93 Difference]: Finished difference Result 85 states and 93 transitions. [2019-10-14 21:45:07,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:45:07,658 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2019-10-14 21:45:07,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:07,659 INFO L225 Difference]: With dead ends: 85 [2019-10-14 21:45:07,659 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 21:45:07,661 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:45:07,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 21:45:07,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-10-14 21:45:07,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:45:07,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-10-14 21:45:07,667 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 44 [2019-10-14 21:45:07,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:07,668 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-10-14 21:45:07,668 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:45:07,668 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-10-14 21:45:07,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:45:07,669 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:07,669 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:07,874 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:07,875 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:07,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:07,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1397676122, now seen corresponding path program 10 times [2019-10-14 21:45:07,876 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:07,876 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018501043] [2019-10-14 21:45:07,876 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:07,877 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:07,877 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:07,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:08,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:08,029 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2019-10-14 21:45:08,029 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018501043] [2019-10-14 21:45:08,029 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3432379] [2019-10-14 21:45:08,030 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 21:45:08,080 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:45:08,081 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:08,082 INFO L256 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:45:08,084 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:08,109 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2019-10-14 21:45:08,109 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:08,109 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:45:08,110 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088172833] [2019-10-14 21:45:08,110 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:45:08,110 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:08,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:45:08,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:45:08,111 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 15 states. [2019-10-14 21:45:08,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:08,219 INFO L93 Difference]: Finished difference Result 90 states and 98 transitions. [2019-10-14 21:45:08,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:45:08,220 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2019-10-14 21:45:08,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:08,221 INFO L225 Difference]: With dead ends: 90 [2019-10-14 21:45:08,221 INFO L226 Difference]: Without dead ends: 55 [2019-10-14 21:45:08,222 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:45:08,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-14 21:45:08,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-10-14 21:45:08,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-10-14 21:45:08,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2019-10-14 21:45:08,228 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 47 [2019-10-14 21:45:08,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:08,228 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2019-10-14 21:45:08,229 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:45:08,229 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2019-10-14 21:45:08,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-14 21:45:08,230 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:08,230 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:08,441 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:08,442 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:08,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:08,443 INFO L82 PathProgramCache]: Analyzing trace with hash -110123167, now seen corresponding path program 11 times [2019-10-14 21:45:08,443 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:08,443 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760964015] [2019-10-14 21:45:08,444 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:08,444 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:08,444 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:08,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:08,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:08,623 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-10-14 21:45:08,624 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760964015] [2019-10-14 21:45:08,624 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [516078404] [2019-10-14 21:45:08,624 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 21:45:12,572 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-10-14 21:45:12,572 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:12,582 INFO L256 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:45:12,584 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:12,603 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-10-14 21:45:12,604 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:12,604 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:45:12,604 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628302838] [2019-10-14 21:45:12,605 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:45:12,605 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:12,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:45:12,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:45:12,606 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 16 states. [2019-10-14 21:45:12,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:12,716 INFO L93 Difference]: Finished difference Result 95 states and 103 transitions. [2019-10-14 21:45:12,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:45:12,716 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2019-10-14 21:45:12,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:12,717 INFO L225 Difference]: With dead ends: 95 [2019-10-14 21:45:12,717 INFO L226 Difference]: Without dead ends: 58 [2019-10-14 21:45:12,718 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 51 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 21:45:12,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-14 21:45:12,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2019-10-14 21:45:12,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 21:45:12,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2019-10-14 21:45:12,726 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 50 [2019-10-14 21:45:12,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:12,727 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2019-10-14 21:45:12,727 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:45:12,727 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2019-10-14 21:45:12,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-14 21:45:12,728 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:12,728 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:12,929 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:12,929 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:12,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:12,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1531998470, now seen corresponding path program 12 times [2019-10-14 21:45:12,930 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:12,931 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184809908] [2019-10-14 21:45:12,931 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:12,931 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:12,932 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:12,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:13,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:13,095 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2019-10-14 21:45:13,095 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184809908] [2019-10-14 21:45:13,095 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761494181] [2019-10-14 21:45:13,096 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 21:45:17,992 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:45:17,992 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:18,003 INFO L256 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 21:45:18,006 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:18,057 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 24 proven. 78 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-10-14 21:45:18,058 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:18,058 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 18 [2019-10-14 21:45:18,058 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640871230] [2019-10-14 21:45:18,060 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:45:18,060 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:18,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:45:18,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:45:18,061 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 18 states. [2019-10-14 21:45:18,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:18,214 INFO L93 Difference]: Finished difference Result 100 states and 108 transitions. [2019-10-14 21:45:18,214 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:45:18,214 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 53 [2019-10-14 21:45:18,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:18,215 INFO L225 Difference]: With dead ends: 100 [2019-10-14 21:45:18,216 INFO L226 Difference]: Without dead ends: 61 [2019-10-14 21:45:18,216 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:45:18,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-14 21:45:18,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2019-10-14 21:45:18,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-14 21:45:18,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2019-10-14 21:45:18,223 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 53 [2019-10-14 21:45:18,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:18,223 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2019-10-14 21:45:18,223 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:45:18,223 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2019-10-14 21:45:18,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-10-14 21:45:18,224 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:18,224 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:18,425 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:18,425 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:18,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:18,426 INFO L82 PathProgramCache]: Analyzing trace with hash -420881343, now seen corresponding path program 13 times [2019-10-14 21:45:18,426 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:18,427 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146719934] [2019-10-14 21:45:18,427 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:18,427 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:18,427 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:18,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:18,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:18,626 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2019-10-14 21:45:18,626 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146719934] [2019-10-14 21:45:18,626 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44039053] [2019-10-14 21:45:18,627 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 21:45:18,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:18,698 INFO L256 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:45:18,700 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:18,728 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2019-10-14 21:45:18,728 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:18,729 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:45:18,730 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699627551] [2019-10-14 21:45:18,730 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:45:18,730 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:18,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:45:18,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:45:18,731 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 18 states. [2019-10-14 21:45:18,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:18,885 INFO L93 Difference]: Finished difference Result 105 states and 113 transitions. [2019-10-14 21:45:18,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:45:18,886 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2019-10-14 21:45:18,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:18,887 INFO L225 Difference]: With dead ends: 105 [2019-10-14 21:45:18,887 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 21:45:18,888 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 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 21:45:18,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 21:45:18,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2019-10-14 21:45:18,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 21:45:18,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2019-10-14 21:45:18,902 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 56 [2019-10-14 21:45:18,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:18,903 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2019-10-14 21:45:18,903 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:45:18,903 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2019-10-14 21:45:18,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-14 21:45:18,911 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:18,911 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:19,111 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:19,112 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:19,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:19,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1004884582, now seen corresponding path program 14 times [2019-10-14 21:45:19,112 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:19,113 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104651618] [2019-10-14 21:45:19,113 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:19,113 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:19,113 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:19,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:19,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:19,312 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-14 21:45:19,313 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104651618] [2019-10-14 21:45:19,313 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191884296] [2019-10-14 21:45:19,313 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 21:45:19,376 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:45:19,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:19,378 INFO L256 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:45:19,384 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:19,401 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-14 21:45:19,401 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:19,401 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:45:19,402 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909989281] [2019-10-14 21:45:19,402 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:45:19,402 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:19,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:45:19,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:45:19,403 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand 19 states. [2019-10-14 21:45:19,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:19,588 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2019-10-14 21:45:19,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:45:19,588 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2019-10-14 21:45:19,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:19,589 INFO L225 Difference]: With dead ends: 110 [2019-10-14 21:45:19,589 INFO L226 Difference]: Without dead ends: 67 [2019-10-14 21:45:19,590 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 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 21:45:19,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-10-14 21:45:19,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2019-10-14 21:45:19,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-14 21:45:19,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-10-14 21:45:19,596 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 59 [2019-10-14 21:45:19,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:19,596 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-10-14 21:45:19,596 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:45:19,596 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-10-14 21:45:19,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-10-14 21:45:19,597 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:19,597 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:19,797 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:19,798 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:19,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:19,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1390483167, now seen corresponding path program 15 times [2019-10-14 21:45:19,799 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:19,799 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070250548] [2019-10-14 21:45:19,799 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:19,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:19,800 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:19,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:20,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:20,027 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2019-10-14 21:45:20,028 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070250548] [2019-10-14 21:45:20,028 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935358448] [2019-10-14 21:45:20,028 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 21:45:27,108 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-14 21:45:27,109 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:27,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-14 21:45:27,116 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:27,133 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2019-10-14 21:45:27,133 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:27,133 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:45:27,134 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640931612] [2019-10-14 21:45:27,134 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:45:27,134 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:27,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:45:27,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:45:27,135 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 20 states. [2019-10-14 21:45:27,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:27,309 INFO L93 Difference]: Finished difference Result 115 states and 123 transitions. [2019-10-14 21:45:27,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:45:27,310 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2019-10-14 21:45:27,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:27,311 INFO L225 Difference]: With dead ends: 115 [2019-10-14 21:45:27,311 INFO L226 Difference]: Without dead ends: 70 [2019-10-14 21:45:27,311 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 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 21:45:27,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-14 21:45:27,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2019-10-14 21:45:27,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-10-14 21:45:27,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 73 transitions. [2019-10-14 21:45:27,317 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 73 transitions. Word has length 62 [2019-10-14 21:45:27,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:27,318 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 73 transitions. [2019-10-14 21:45:27,318 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:45:27,318 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 73 transitions. [2019-10-14 21:45:27,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-14 21:45:27,319 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:27,319 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:27,528 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:27,529 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:27,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:27,529 INFO L82 PathProgramCache]: Analyzing trace with hash 2125345850, now seen corresponding path program 16 times [2019-10-14 21:45:27,530 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:27,530 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270942935] [2019-10-14 21:45:27,530 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:27,531 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:27,531 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:27,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:27,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:27,757 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2019-10-14 21:45:27,757 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270942935] [2019-10-14 21:45:27,757 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364785630] [2019-10-14 21:45:27,758 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 21:45:27,832 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:45:27,833 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:27,834 INFO L256 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:45:27,835 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:27,855 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2019-10-14 21:45:27,855 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:27,855 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:45:27,855 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550508702] [2019-10-14 21:45:27,856 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:45:27,856 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:27,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:45:27,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:45:27,857 INFO L87 Difference]: Start difference. First operand 70 states and 73 transitions. Second operand 21 states. [2019-10-14 21:45:28,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:28,034 INFO L93 Difference]: Finished difference Result 120 states and 128 transitions. [2019-10-14 21:45:28,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:45:28,034 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2019-10-14 21:45:28,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:28,036 INFO L225 Difference]: With dead ends: 120 [2019-10-14 21:45:28,036 INFO L226 Difference]: Without dead ends: 73 [2019-10-14 21:45:28,037 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 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 21:45:28,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-10-14 21:45:28,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2019-10-14 21:45:28,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-14 21:45:28,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2019-10-14 21:45:28,042 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 65 [2019-10-14 21:45:28,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:28,042 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2019-10-14 21:45:28,042 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:45:28,043 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2019-10-14 21:45:28,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-10-14 21:45:28,043 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:28,044 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:28,247 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:28,248 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:28,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:28,248 INFO L82 PathProgramCache]: Analyzing trace with hash -1332687359, now seen corresponding path program 17 times [2019-10-14 21:45:28,249 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:28,249 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143505178] [2019-10-14 21:45:28,249 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:28,250 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:28,250 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:28,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:28,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:28,627 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2019-10-14 21:45:28,627 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143505178] [2019-10-14 21:45:28,628 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621590949] [2019-10-14 21:45:28,628 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