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/sorting_bubblesort_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:42:34,555 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:42:34,558 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:42:34,575 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:42:34,576 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:42:34,578 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:42:34,579 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:42:34,586 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:42:34,588 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:42:34,588 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:42:34,589 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:42:34,591 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:42:34,592 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:42:34,593 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:42:34,594 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:42:34,598 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:42:34,599 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:42:34,600 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:42:34,604 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:42:34,607 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:42:34,609 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:42:34,610 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:42:34,611 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:42:34,612 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:42:34,616 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:42:34,622 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:42:34,623 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:42:34,623 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:42:34,624 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:42:34,628 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:42:34,628 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:42:34,629 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:42:34,629 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:42:34,629 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:42:34,631 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:42:34,634 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:42:34,635 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 21:42:34,656 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:42:34,656 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:42:34,659 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:42:34,660 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:42:34,660 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:42:34,660 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:42:34,661 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:42:34,661 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:42:34,661 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:42:34,661 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:42:34,662 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:42:34,662 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:42:34,663 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:42:34,663 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:42:34,663 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:42:34,663 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:42:34,664 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:42:34,664 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:42:34,664 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:42:34,664 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:42:34,664 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:42:34,665 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:42:34,665 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:42:34,665 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:42:34,665 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:42:34,665 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:42:34,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:42:34,666 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:42:34,666 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:42:34,921 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:42:34,934 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:42:34,937 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:42:34,938 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:42:34,939 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:42:34,939 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/sorting_bubblesort_ground-1.i [2019-10-14 21:42:35,012 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4a9255b9/4293ffa3144b4fc080f86a85d7179c37/FLAG59870ea0c [2019-10-14 21:42:35,452 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:42:35,453 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/sorting_bubblesort_ground-1.i [2019-10-14 21:42:35,459 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4a9255b9/4293ffa3144b4fc080f86a85d7179c37/FLAG59870ea0c [2019-10-14 21:42:35,836 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4a9255b9/4293ffa3144b4fc080f86a85d7179c37 [2019-10-14 21:42:35,846 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:42:35,848 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:42:35,849 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:42:35,849 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:42:35,852 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:42:35,853 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:42:35" (1/1) ... [2019-10-14 21:42:35,856 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e9b8ec1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:35, skipping insertion in model container [2019-10-14 21:42:35,856 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:42:35" (1/1) ... [2019-10-14 21:42:35,863 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:42:35,881 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:42:36,028 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:42:36,032 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:42:36,054 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:42:36,069 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:42:36,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36 WrapperNode [2019-10-14 21:42:36,070 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:42:36,070 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:42:36,070 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:42:36,070 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:42:36,164 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36" (1/1) ... [2019-10-14 21:42:36,165 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36" (1/1) ... [2019-10-14 21:42:36,174 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36" (1/1) ... [2019-10-14 21:42:36,176 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36" (1/1) ... [2019-10-14 21:42:36,195 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36" (1/1) ... [2019-10-14 21:42:36,201 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36" (1/1) ... [2019-10-14 21:42:36,202 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36" (1/1) ... [2019-10-14 21:42:36,204 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:42:36,205 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:42:36,205 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:42:36,205 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:42:36,206 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36" (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 21:42:36,262 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:42:36,262 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:42:36,262 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:42:36,262 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:42:36,262 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:42:36,264 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:42:36,554 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:42:36,554 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-14 21:42:36,555 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:42:36 BoogieIcfgContainer [2019-10-14 21:42:36,555 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:42:36,556 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:42:36,556 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:42:36,560 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:42:36,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:42:35" (1/3) ... [2019-10-14 21:42:36,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dc29d9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:42:36, skipping insertion in model container [2019-10-14 21:42:36,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:36" (2/3) ... [2019-10-14 21:42:36,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dc29d9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:42:36, skipping insertion in model container [2019-10-14 21:42:36,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:42:36" (3/3) ... [2019-10-14 21:42:36,563 INFO L109 eAbstractionObserver]: Analyzing ICFG sorting_bubblesort_ground-1.i [2019-10-14 21:42:36,576 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:42:36,584 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:42:36,599 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:42:36,621 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:42:36,621 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:42:36,621 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:42:36,621 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:42:36,621 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:42:36,621 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:42:36,622 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:42:36,622 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:42:36,636 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2019-10-14 21:42:36,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:42:36,642 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:36,643 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:36,644 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:36,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:36,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1296691801, now seen corresponding path program 1 times [2019-10-14 21:42:36,657 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:36,657 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256841144] [2019-10-14 21:42:36,657 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:36,658 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:36,658 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:36,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:36,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:36,824 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 21:42:36,825 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256841144] [2019-10-14 21:42:36,826 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:36,826 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:42:36,827 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918085168] [2019-10-14 21:42:36,831 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:42:36,832 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:36,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:42:36,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:42:36,851 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 3 states. [2019-10-14 21:42:36,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:36,996 INFO L93 Difference]: Finished difference Result 54 states and 75 transitions. [2019-10-14 21:42:36,996 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:42:36,998 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-14 21:42:36,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:37,007 INFO L225 Difference]: With dead ends: 54 [2019-10-14 21:42:37,008 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:42:37,013 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 21:42:37,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:42:37,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-14 21:42:37,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-14 21:42:37,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2019-10-14 21:42:37,054 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 16 [2019-10-14 21:42:37,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:37,054 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2019-10-14 21:42:37,055 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:42:37,055 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2019-10-14 21:42:37,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:42:37,056 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:37,056 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:37,056 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:37,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:37,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1547542812, now seen corresponding path program 1 times [2019-10-14 21:42:37,057 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:37,058 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277926535] [2019-10-14 21:42:37,058 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,058 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,059 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:37,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,165 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 21:42:37,168 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277926535] [2019-10-14 21:42:37,169 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:37,169 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:42:37,169 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153142559] [2019-10-14 21:42:37,171 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:37,171 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:37,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:37,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:37,173 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand 4 states. [2019-10-14 21:42:37,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:37,256 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2019-10-14 21:42:37,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:42:37,257 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-10-14 21:42:37,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:37,258 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:42:37,258 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 21:42:37,260 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 21:42:37,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 21:42:37,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-10-14 21:42:37,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-14 21:42:37,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2019-10-14 21:42:37,267 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 16 [2019-10-14 21:42:37,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:37,267 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2019-10-14 21:42:37,268 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:37,268 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2019-10-14 21:42:37,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-14 21:42:37,269 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:37,269 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:37,269 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:37,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:37,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1387426810, now seen corresponding path program 1 times [2019-10-14 21:42:37,270 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:37,270 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456963557] [2019-10-14 21:42:37,271 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,271 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,271 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:37,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,343 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:37,343 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456963557] [2019-10-14 21:42:37,344 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:37,344 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:42:37,344 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790762443] [2019-10-14 21:42:37,345 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:37,345 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:37,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:37,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:37,346 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand 4 states. [2019-10-14 21:42:37,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:37,424 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2019-10-14 21:42:37,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:42:37,426 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-10-14 21:42:37,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:37,427 INFO L225 Difference]: With dead ends: 44 [2019-10-14 21:42:37,427 INFO L226 Difference]: Without dead ends: 31 [2019-10-14 21:42:37,428 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 21:42:37,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-14 21:42:37,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-14 21:42:37,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-14 21:42:37,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2019-10-14 21:42:37,434 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 18 [2019-10-14 21:42:37,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:37,435 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2019-10-14 21:42:37,435 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:37,435 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2019-10-14 21:42:37,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:42:37,436 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:37,436 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 21:42:37,436 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:37,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:37,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1108929549, now seen corresponding path program 1 times [2019-10-14 21:42:37,437 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:37,437 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231242333] [2019-10-14 21:42:37,437 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,438 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,438 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:37,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:37,490 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231242333] [2019-10-14 21:42:37,490 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:37,490 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:42:37,490 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090889697] [2019-10-14 21:42:37,491 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:37,491 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:37,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:37,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:37,492 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 4 states. [2019-10-14 21:42:37,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:37,570 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2019-10-14 21:42:37,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:42:37,571 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-10-14 21:42:37,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:37,572 INFO L225 Difference]: With dead ends: 56 [2019-10-14 21:42:37,572 INFO L226 Difference]: Without dead ends: 35 [2019-10-14 21:42:37,573 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 21:42:37,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-14 21:42:37,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2019-10-14 21:42:37,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-14 21:42:37,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2019-10-14 21:42:37,585 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 20 [2019-10-14 21:42:37,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:37,586 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2019-10-14 21:42:37,586 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:37,586 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2019-10-14 21:42:37,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:42:37,587 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:37,587 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, 1, 1, 1] [2019-10-14 21:42:37,587 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:37,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:37,588 INFO L82 PathProgramCache]: Analyzing trace with hash -2055572838, now seen corresponding path program 1 times [2019-10-14 21:42:37,588 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:37,589 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630718030] [2019-10-14 21:42:37,589 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,589 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,590 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:37,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,710 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 21:42:37,711 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630718030] [2019-10-14 21:42:37,711 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [977508526] [2019-10-14 21:42:37,711 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 21:42:37,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,768 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:42:37,774 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:37,807 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 21:42:37,807 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:37,807 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:42:37,808 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757367727] [2019-10-14 21:42:37,808 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:42:37,809 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:37,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:42:37,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:42:37,809 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2019-10-14 21:42:37,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:37,872 INFO L93 Difference]: Finished difference Result 58 states and 72 transitions. [2019-10-14 21:42:37,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:42:37,872 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-10-14 21:42:37,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:37,873 INFO L225 Difference]: With dead ends: 58 [2019-10-14 21:42:37,873 INFO L226 Difference]: Without dead ends: 35 [2019-10-14 21:42:37,874 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 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 21:42:37,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-14 21:42:37,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-10-14 21:42:37,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:42:37,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-10-14 21:42:37,880 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 23 [2019-10-14 21:42:37,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:37,880 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-10-14 21:42:37,880 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:42:37,880 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-10-14 21:42:37,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-14 21:42:37,881 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:37,881 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:38,092 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:38,095 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:38,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:38,096 INFO L82 PathProgramCache]: Analyzing trace with hash 442145592, now seen corresponding path program 2 times [2019-10-14 21:42:38,096 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:38,096 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133613244] [2019-10-14 21:42:38,096 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,097 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,097 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:38,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:38,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:38,153 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:42:38,153 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133613244] [2019-10-14 21:42:38,153 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900147222] [2019-10-14 21:42:38,153 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 21:42:38,194 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:38,194 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:38,195 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:42:38,196 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:38,208 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:42:38,208 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:38,209 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:42:38,209 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159536834] [2019-10-14 21:42:38,209 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:42:38,210 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:38,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:42:38,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:42:38,210 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 7 states. [2019-10-14 21:42:38,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:38,268 INFO L93 Difference]: Finished difference Result 60 states and 74 transitions. [2019-10-14 21:42:38,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:42:38,268 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2019-10-14 21:42:38,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:38,269 INFO L225 Difference]: With dead ends: 60 [2019-10-14 21:42:38,269 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 21:42:38,270 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 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 21:42:38,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 21:42:38,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-10-14 21:42:38,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-14 21:42:38,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2019-10-14 21:42:38,275 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2019-10-14 21:42:38,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:38,276 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2019-10-14 21:42:38,276 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:42:38,276 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2019-10-14 21:42:38,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 21:42:38,277 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:38,277 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:38,486 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:38,486 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:38,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:38,487 INFO L82 PathProgramCache]: Analyzing trace with hash -137161642, now seen corresponding path program 3 times [2019-10-14 21:42:38,487 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:38,487 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421601673] [2019-10-14 21:42:38,487 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,487 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,488 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:38,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:38,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:38,570 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:42:38,571 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421601673] [2019-10-14 21:42:38,571 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389707825] [2019-10-14 21:42:38,571 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 21:42:38,617 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:42:38,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:38,618 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:42:38,620 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:38,639 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:42:38,639 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:38,639 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2019-10-14 21:42:38,640 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250375145] [2019-10-14 21:42:38,640 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:42:38,640 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:38,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:42:38,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:38,641 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand 9 states. [2019-10-14 21:42:38,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:38,763 INFO L93 Difference]: Finished difference Result 71 states and 90 transitions. [2019-10-14 21:42:38,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:42:38,764 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-10-14 21:42:38,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:38,765 INFO L225 Difference]: With dead ends: 71 [2019-10-14 21:42:38,765 INFO L226 Difference]: Without dead ends: 48 [2019-10-14 21:42:38,767 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:38,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-14 21:42:38,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2019-10-14 21:42:38,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 21:42:38,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2019-10-14 21:42:38,778 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 27 [2019-10-14 21:42:38,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:38,779 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2019-10-14 21:42:38,779 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:42:38,779 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2019-10-14 21:42:38,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 21:42:38,781 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:38,782 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:38,987 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:38,987 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:38,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:38,987 INFO L82 PathProgramCache]: Analyzing trace with hash -890436781, now seen corresponding path program 4 times [2019-10-14 21:42:38,988 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:38,990 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713173144] [2019-10-14 21:42:38,990 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,990 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,990 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:39,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:39,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:39,115 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:42:39,116 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713173144] [2019-10-14 21:42:39,117 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512831043] [2019-10-14 21:42:39,117 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 21:42:39,167 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:39,167 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:39,169 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:42:39,171 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:39,192 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:42:39,193 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:39,193 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:42:39,193 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389425551] [2019-10-14 21:42:39,194 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:42:39,194 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:39,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:42:39,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:39,196 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 9 states. [2019-10-14 21:42:39,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:39,307 INFO L93 Difference]: Finished difference Result 74 states and 90 transitions. [2019-10-14 21:42:39,307 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:42:39,307 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2019-10-14 21:42:39,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:39,308 INFO L225 Difference]: With dead ends: 74 [2019-10-14 21:42:39,308 INFO L226 Difference]: Without dead ends: 46 [2019-10-14 21:42:39,308 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 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 21:42:39,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-14 21:42:39,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-10-14 21:42:39,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-14 21:42:39,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2019-10-14 21:42:39,313 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 32 [2019-10-14 21:42:39,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:39,314 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2019-10-14 21:42:39,314 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:42:39,314 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2019-10-14 21:42:39,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 21:42:39,315 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:39,315 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:39,518 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:39,519 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:39,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:39,519 INFO L82 PathProgramCache]: Analyzing trace with hash -250762123, now seen corresponding path program 5 times [2019-10-14 21:42:39,520 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:39,520 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635976889] [2019-10-14 21:42:39,521 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:39,521 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:39,521 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:39,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:39,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:39,599 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:42:39,600 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635976889] [2019-10-14 21:42:39,600 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021084601] [2019-10-14 21:42:39,601 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 21:42:39,643 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2019-10-14 21:42:39,643 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:39,644 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:42:39,650 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:39,694 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:42:39,694 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:39,694 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2019-10-14 21:42:39,695 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462063177] [2019-10-14 21:42:39,695 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:42:39,695 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:39,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:42:39,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:39,696 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 12 states. [2019-10-14 21:42:39,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:39,795 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2019-10-14 21:42:39,795 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:42:39,795 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2019-10-14 21:42:39,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:39,796 INFO L225 Difference]: With dead ends: 86 [2019-10-14 21:42:39,796 INFO L226 Difference]: Without dead ends: 58 [2019-10-14 21:42:39,797 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:39,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-14 21:42:39,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2019-10-14 21:42:39,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-14 21:42:39,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2019-10-14 21:42:39,803 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 34 [2019-10-14 21:42:39,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:39,804 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2019-10-14 21:42:39,804 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:42:39,804 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2019-10-14 21:42:39,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 21:42:39,805 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:39,805 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:40,013 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:40,014 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:40,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:40,014 INFO L82 PathProgramCache]: Analyzing trace with hash -1537034928, now seen corresponding path program 6 times [2019-10-14 21:42:40,015 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:40,015 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708171165] [2019-10-14 21:42:40,015 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:40,016 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:40,016 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:40,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,145 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-10-14 21:42:40,145 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708171165] [2019-10-14 21:42:40,146 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039107476] [2019-10-14 21:42:40,146 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 21:42:40,208 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:42:40,208 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:40,209 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:42:40,211 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:40,265 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:42:40,266 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:40,266 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2019-10-14 21:42:40,266 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473891780] [2019-10-14 21:42:40,267 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:42:40,267 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:40,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:42:40,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:42:40,269 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand 14 states. [2019-10-14 21:42:40,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:40,405 INFO L93 Difference]: Finished difference Result 100 states and 126 transitions. [2019-10-14 21:42:40,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:42:40,406 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2019-10-14 21:42:40,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:40,407 INFO L225 Difference]: With dead ends: 100 [2019-10-14 21:42:40,407 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 21:42:40,408 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:42:40,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 21:42:40,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 61. [2019-10-14 21:42:40,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-14 21:42:40,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 73 transitions. [2019-10-14 21:42:40,425 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 73 transitions. Word has length 39 [2019-10-14 21:42:40,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:40,425 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 73 transitions. [2019-10-14 21:42:40,425 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:42:40,425 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 73 transitions. [2019-10-14 21:42:40,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 21:42:40,426 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:40,426 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:40,632 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:40,633 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:40,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:40,634 INFO L82 PathProgramCache]: Analyzing trace with hash 747611417, now seen corresponding path program 7 times [2019-10-14 21:42:40,635 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:40,635 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762316513] [2019-10-14 21:42:40,636 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:40,636 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:40,636 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:40,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,748 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:40,749 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762316513] [2019-10-14 21:42:40,749 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925181998] [2019-10-14 21:42:40,749 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 21:42:40,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,800 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:42:40,812 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:40,840 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:40,840 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:40,841 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:42:40,841 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779802310] [2019-10-14 21:42:40,841 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:42:40,842 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:40,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:42:40,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:40,842 INFO L87 Difference]: Start difference. First operand 61 states and 73 transitions. Second operand 12 states. [2019-10-14 21:42:40,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:40,929 INFO L93 Difference]: Finished difference Result 104 states and 128 transitions. [2019-10-14 21:42:40,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:42:40,930 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 44 [2019-10-14 21:42:40,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:40,931 INFO L225 Difference]: With dead ends: 104 [2019-10-14 21:42:40,931 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 21:42:40,932 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 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 21:42:40,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 21:42:40,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-10-14 21:42:40,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-10-14 21:42:40,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2019-10-14 21:42:40,943 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 44 [2019-10-14 21:42:40,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:40,949 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2019-10-14 21:42:40,949 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:42:40,949 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2019-10-14 21:42:40,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-14 21:42:40,951 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:40,951 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:41,155 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:41,156 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:41,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:41,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1331800891, now seen corresponding path program 8 times [2019-10-14 21:42:41,156 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:41,156 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227329256] [2019-10-14 21:42:41,157 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,157 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,157 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:41,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,263 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:41,263 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227329256] [2019-10-14 21:42:41,264 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697564008] [2019-10-14 21:42:41,264 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 21:42:41,311 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:41,311 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:41,313 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:42:41,315 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:41,337 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:41,337 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:41,337 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:42:41,337 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891505882] [2019-10-14 21:42:41,338 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:42:41,338 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:41,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:42:41,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:42:41,339 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand 13 states. [2019-10-14 21:42:41,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:41,422 INFO L93 Difference]: Finished difference Result 106 states and 130 transitions. [2019-10-14 21:42:41,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:42:41,423 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2019-10-14 21:42:41,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:41,424 INFO L225 Difference]: With dead ends: 106 [2019-10-14 21:42:41,424 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 21:42:41,424 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 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 21:42:41,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 21:42:41,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-10-14 21:42:41,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-10-14 21:42:41,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 77 transitions. [2019-10-14 21:42:41,431 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 77 transitions. Word has length 46 [2019-10-14 21:42:41,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:41,431 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 77 transitions. [2019-10-14 21:42:41,431 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:42:41,431 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 77 transitions. [2019-10-14 21:42:41,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-14 21:42:41,432 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:41,433 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:41,643 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:41,644 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:41,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:41,644 INFO L82 PathProgramCache]: Analyzing trace with hash 97169629, now seen corresponding path program 9 times [2019-10-14 21:42:41,645 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:41,645 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217624624] [2019-10-14 21:42:41,645 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,646 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,646 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:41,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,782 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:41,783 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217624624] [2019-10-14 21:42:41,783 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967349030] [2019-10-14 21:42:41,783 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 21:42:41,829 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-14 21:42:41,830 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:41,831 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 21:42:41,833 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:42,031 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:42:42,032 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2019-10-14 21:42:42,033 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:42:42,035 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:42:42,036 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:42:42,036 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:3 [2019-10-14 21:42:42,051 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:42,087 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2019-10-14 21:42:42,088 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:42,088 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 23 [2019-10-14 21:42:42,088 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686983567] [2019-10-14 21:42:42,089 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:42:42,089 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:42,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:42:42,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:42:42,090 INFO L87 Difference]: Start difference. First operand 65 states and 77 transitions. Second operand 23 states. [2019-10-14 21:42:42,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:42,818 INFO L93 Difference]: Finished difference Result 124 states and 153 transitions. [2019-10-14 21:42:42,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 21:42:42,819 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2019-10-14 21:42:42,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:42,822 INFO L225 Difference]: With dead ends: 124 [2019-10-14 21:42:42,822 INFO L226 Difference]: Without dead ends: 84 [2019-10-14 21:42:42,823 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=267, Invalid=1293, Unknown=0, NotChecked=0, Total=1560 [2019-10-14 21:42:42,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-10-14 21:42:42,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 74. [2019-10-14 21:42:42,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-10-14 21:42:42,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 86 transitions. [2019-10-14 21:42:42,836 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 86 transitions. Word has length 48 [2019-10-14 21:42:42,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:42,836 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 86 transitions. [2019-10-14 21:42:42,837 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:42:42,837 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 86 transitions. [2019-10-14 21:42:42,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-10-14 21:42:42,838 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:42,838 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:43,041 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:43,042 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:43,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:43,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1531389518, now seen corresponding path program 1 times [2019-10-14 21:42:43,044 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:43,044 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145273974] [2019-10-14 21:42:43,044 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:43,045 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:43,045 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:43,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,156 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2019-10-14 21:42:43,156 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145273974] [2019-10-14 21:42:43,157 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387448078] [2019-10-14 21:42:43,157 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:43,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,219 INFO L256 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:42:43,221 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:43,334 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-10-14 21:42:43,335 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:43,335 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13] total 19 [2019-10-14 21:42:43,335 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543651067] [2019-10-14 21:42:43,336 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:42:43,336 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:43,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:42:43,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:42:43,336 INFO L87 Difference]: Start difference. First operand 74 states and 86 transitions. Second operand 19 states. [2019-10-14 21:42:43,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:43,533 INFO L93 Difference]: Finished difference Result 134 states and 164 transitions. [2019-10-14 21:42:43,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:42:43,533 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 58 [2019-10-14 21:42:43,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:43,535 INFO L225 Difference]: With dead ends: 134 [2019-10-14 21:42:43,536 INFO L226 Difference]: Without dead ends: 87 [2019-10-14 21:42:43,537 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:42:43,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2019-10-14 21:42:43,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 82. [2019-10-14 21:42:43,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-14 21:42:43,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 96 transitions. [2019-10-14 21:42:43,544 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 96 transitions. Word has length 58 [2019-10-14 21:42:43,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:43,544 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 96 transitions. [2019-10-14 21:42:43,545 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:42:43,545 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 96 transitions. [2019-10-14 21:42:43,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 21:42:43,546 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:43,546 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:43,758 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:43,758 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:43,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:43,759 INFO L82 PathProgramCache]: Analyzing trace with hash -193251271, now seen corresponding path program 2 times [2019-10-14 21:42:43,759 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:43,759 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517495593] [2019-10-14 21:42:43,759 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:43,759 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:43,759 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:43,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,836 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 3 proven. 35 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2019-10-14 21:42:43,836 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517495593] [2019-10-14 21:42:43,836 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088613641] [2019-10-14 21:42:43,836 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:43,891 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:43,891 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:43,892 INFO L256 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:42:43,895 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:44,029 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-14 21:42:44,029 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:44,029 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 14] total 21 [2019-10-14 21:42:44,030 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759631340] [2019-10-14 21:42:44,030 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:42:44,030 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:44,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:42:44,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:42:44,031 INFO L87 Difference]: Start difference. First operand 82 states and 96 transitions. Second operand 21 states. [2019-10-14 21:42:44,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:44,174 INFO L93 Difference]: Finished difference Result 148 states and 182 transitions. [2019-10-14 21:42:44,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:42:44,190 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 63 [2019-10-14 21:42:44,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:44,191 INFO L225 Difference]: With dead ends: 148 [2019-10-14 21:42:44,191 INFO L226 Difference]: Without dead ends: 95 [2019-10-14 21:42:44,192 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:42:44,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-10-14 21:42:44,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 90. [2019-10-14 21:42:44,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2019-10-14 21:42:44,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 106 transitions. [2019-10-14 21:42:44,200 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 106 transitions. Word has length 63 [2019-10-14 21:42:44,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:44,200 INFO L462 AbstractCegarLoop]: Abstraction has 90 states and 106 transitions. [2019-10-14 21:42:44,200 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:42:44,200 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 106 transitions. [2019-10-14 21:42:44,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-10-14 21:42:44,201 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:44,201 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:44,405 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:44,406 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:44,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:44,406 INFO L82 PathProgramCache]: Analyzing trace with hash -606693674, now seen corresponding path program 3 times [2019-10-14 21:42:44,406 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:44,407 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122810801] [2019-10-14 21:42:44,407 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:44,407 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:44,408 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:44,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:44,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:44,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:44,583 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2019-10-14 21:42:44,584 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122810801] [2019-10-14 21:42:44,584 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406698860] [2019-10-14 21:42:44,584 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:44,655 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-10-14 21:42:44,656 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:44,657 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 33 conjunts are in the unsatisfiable core [2019-10-14 21:42:44,660 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:45,126 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:42:45,126 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 13 [2019-10-14 21:42:45,127 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:42:45,131 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:42:45,132 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:42:45,132 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:37, output treesize:3 [2019-10-14 21:42:45,157 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:45,220 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2019-10-14 21:42:45,221 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:45,221 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 19] total 33 [2019-10-14 21:42:45,221 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251897040] [2019-10-14 21:42:45,222 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-14 21:42:45,222 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:45,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-14 21:42:45,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=886, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 21:42:45,223 INFO L87 Difference]: Start difference. First operand 90 states and 106 transitions. Second operand 33 states. [2019-10-14 21:43:04,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:04,094 INFO L93 Difference]: Finished difference Result 187 states and 230 transitions. [2019-10-14 21:43:04,095 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-10-14 21:43:04,095 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 68 [2019-10-14 21:43:04,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:04,097 INFO L225 Difference]: With dead ends: 187 [2019-10-14 21:43:04,097 INFO L226 Difference]: Without dead ends: 128 [2019-10-14 21:43:04,099 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 940 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=511, Invalid=3521, Unknown=0, NotChecked=0, Total=4032 [2019-10-14 21:43:04,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2019-10-14 21:43:04,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 100. [2019-10-14 21:43:04,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-10-14 21:43:04,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 116 transitions. [2019-10-14 21:43:04,108 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 116 transitions. Word has length 68 [2019-10-14 21:43:04,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:04,108 INFO L462 AbstractCegarLoop]: Abstraction has 100 states and 116 transitions. [2019-10-14 21:43:04,108 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-14 21:43:04,108 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 116 transitions. [2019-10-14 21:43:04,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-10-14 21:43:04,109 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:04,109 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 6, 6, 6, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:04,312 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:04,313 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:04,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:04,314 INFO L82 PathProgramCache]: Analyzing trace with hash -1776234069, now seen corresponding path program 4 times [2019-10-14 21:43:04,314 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:04,315 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297961061] [2019-10-14 21:43:04,315 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:04,315 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:04,316 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:04,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:04,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:04,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:04,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:04,527 INFO L134 CoverageAnalysis]: Checked inductivity of 237 backedges. 4 proven. 169 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-14 21:43:04,527 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297961061] [2019-10-14 21:43:04,527 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268237038] [2019-10-14 21:43:04,528 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:04,621 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:43:04,622 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:04,623 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:43:04,625 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:04,667 INFO L134 CoverageAnalysis]: Checked inductivity of 237 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2019-10-14 21:43:04,668 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:04,668 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:43:04,668 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574394181] [2019-10-14 21:43:04,669 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:43:04,670 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:04,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:43:04,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:43:04,670 INFO L87 Difference]: Start difference. First operand 100 states and 116 transitions. Second operand 18 states. [2019-10-14 21:43:04,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:04,794 INFO L93 Difference]: Finished difference Result 170 states and 202 transitions. [2019-10-14 21:43:04,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:43:04,795 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 78 [2019-10-14 21:43:04,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:04,796 INFO L225 Difference]: With dead ends: 170 [2019-10-14 21:43:04,796 INFO L226 Difference]: Without dead ends: 103 [2019-10-14 21:43:04,797 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 83 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 21:43:04,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2019-10-14 21:43:04,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2019-10-14 21:43:04,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2019-10-14 21:43:04,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 118 transitions. [2019-10-14 21:43:04,808 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 118 transitions. Word has length 78 [2019-10-14 21:43:04,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:04,810 INFO L462 AbstractCegarLoop]: Abstraction has 102 states and 118 transitions. [2019-10-14 21:43:04,810 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:43:04,810 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 118 transitions. [2019-10-14 21:43:04,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2019-10-14 21:43:04,812 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:04,812 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 6, 6, 6, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:05,016 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:05,016 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:05,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:05,017 INFO L82 PathProgramCache]: Analyzing trace with hash 1102761805, now seen corresponding path program 5 times [2019-10-14 21:43:05,017 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:05,017 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599426333] [2019-10-14 21:43:05,017 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:05,017 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:05,017 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:05,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:05,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:05,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:05,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:05,202 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 4 proven. 196 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-14 21:43:05,202 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599426333] [2019-10-14 21:43:05,203 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666211684] [2019-10-14 21:43:05,203 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:05,323 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2019-10-14 21:43:05,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:05,325 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:43:05,327 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:05,431 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 1 proven. 51 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2019-10-14 21:43:05,431 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:05,431 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 25 [2019-10-14 21:43:05,432 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572537938] [2019-10-14 21:43:05,432 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 21:43:05,432 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:05,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 21:43:05,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=427, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:43:05,433 INFO L87 Difference]: Start difference. First operand 102 states and 118 transitions. Second operand 25 states. [2019-10-14 21:43:05,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:05,624 INFO L93 Difference]: Finished difference Result 182 states and 220 transitions. [2019-10-14 21:43:05,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 21:43:05,624 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 80 [2019-10-14 21:43:05,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:05,626 INFO L225 Difference]: With dead ends: 182 [2019-10-14 21:43:05,626 INFO L226 Difference]: Without dead ends: 115 [2019-10-14 21:43:05,627 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=427, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:43:05,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2019-10-14 21:43:05,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 110. [2019-10-14 21:43:05,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2019-10-14 21:43:05,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 128 transitions. [2019-10-14 21:43:05,634 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 128 transitions. Word has length 80 [2019-10-14 21:43:05,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:05,635 INFO L462 AbstractCegarLoop]: Abstraction has 110 states and 128 transitions. [2019-10-14 21:43:05,635 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 21:43:05,635 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 128 transitions. [2019-10-14 21:43:05,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2019-10-14 21:43:05,636 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:05,636 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 7, 7, 7, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:05,845 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:05,846 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:05,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:05,847 INFO L82 PathProgramCache]: Analyzing trace with hash 2131195780, now seen corresponding path program 6 times [2019-10-14 21:43:05,847 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:05,847 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842130721] [2019-10-14 21:43:05,847 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:05,848 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:05,848 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:05,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,045 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 4 proven. 225 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2019-10-14 21:43:06,046 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842130721] [2019-10-14 21:43:06,046 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59824822] [2019-10-14 21:43:06,046 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:06,271 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2019-10-14 21:43:06,271 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:06,273 INFO L256 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 21:43:06,275 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:06,320 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2019-10-14 21:43:06,320 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:06,320 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:43:06,320 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047400671] [2019-10-14 21:43:06,321 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:43:06,321 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:06,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:43:06,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:43:06,322 INFO L87 Difference]: Start difference. First operand 110 states and 128 transitions. Second operand 20 states. [2019-10-14 21:43:06,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:06,458 INFO L93 Difference]: Finished difference Result 186 states and 222 transitions. [2019-10-14 21:43:06,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:43:06,459 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 85 [2019-10-14 21:43:06,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:06,460 INFO L225 Difference]: With dead ends: 186 [2019-10-14 21:43:06,460 INFO L226 Difference]: Without dead ends: 113 [2019-10-14 21:43:06,462 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 90 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 21:43:06,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2019-10-14 21:43:06,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2019-10-14 21:43:06,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-10-14 21:43:06,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 130 transitions. [2019-10-14 21:43:06,471 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 130 transitions. Word has length 85 [2019-10-14 21:43:06,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:06,471 INFO L462 AbstractCegarLoop]: Abstraction has 112 states and 130 transitions. [2019-10-14 21:43:06,472 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:43:06,472 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 130 transitions. [2019-10-14 21:43:06,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-14 21:43:06,473 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:06,473 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 7, 7, 7, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:06,686 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:06,687 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:06,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:06,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1960493150, now seen corresponding path program 7 times [2019-10-14 21:43:06,687 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:06,687 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940334729] [2019-10-14 21:43:06,688 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:06,688 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:06,688 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:06,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,927 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 4 proven. 256 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2019-10-14 21:43:06,928 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940334729] [2019-10-14 21:43:06,929 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519682913] [2019-10-14 21:43:06,930 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:07,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:07,023 INFO L256 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:43:07,026 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:07,057 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2019-10-14 21:43:07,057 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:07,057 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:43:07,058 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791758484] [2019-10-14 21:43:07,058 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:43:07,058 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:07,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:43:07,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:43:07,059 INFO L87 Difference]: Start difference. First operand 112 states and 130 transitions. Second operand 21 states. [2019-10-14 21:43:07,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:07,200 INFO L93 Difference]: Finished difference Result 188 states and 224 transitions. [2019-10-14 21:43:07,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:43:07,200 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 87 [2019-10-14 21:43:07,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:07,201 INFO L225 Difference]: With dead ends: 188 [2019-10-14 21:43:07,201 INFO L226 Difference]: Without dead ends: 115 [2019-10-14 21:43:07,202 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 92 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 21:43:07,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2019-10-14 21:43:07,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2019-10-14 21:43:07,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2019-10-14 21:43:07,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 132 transitions. [2019-10-14 21:43:07,210 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 132 transitions. Word has length 87 [2019-10-14 21:43:07,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:07,210 INFO L462 AbstractCegarLoop]: Abstraction has 114 states and 132 transitions. [2019-10-14 21:43:07,210 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:43:07,210 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 132 transitions. [2019-10-14 21:43:07,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2019-10-14 21:43:07,211 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:07,211 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 7, 7, 7, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:07,415 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:07,415 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:07,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:07,415 INFO L82 PathProgramCache]: Analyzing trace with hash 116488256, now seen corresponding path program 8 times [2019-10-14 21:43:07,416 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:07,416 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481055016] [2019-10-14 21:43:07,416 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:07,416 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:07,416 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:07,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:07,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:07,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:07,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:07,640 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 4 proven. 289 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2019-10-14 21:43:07,640 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481055016] [2019-10-14 21:43:07,640 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533650629] [2019-10-14 21:43:07,640 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:07,713 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:43:07,713 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:07,714 INFO L256 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:43:07,716 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:07,745 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2019-10-14 21:43:07,745 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:07,745 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-14 21:43:07,746 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720385906] [2019-10-14 21:43:07,746 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:43:07,746 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:07,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:43:07,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:43:07,747 INFO L87 Difference]: Start difference. First operand 114 states and 132 transitions. Second operand 22 states. [2019-10-14 21:43:07,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:07,927 INFO L93 Difference]: Finished difference Result 190 states and 226 transitions. [2019-10-14 21:43:07,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:43:07,928 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 89 [2019-10-14 21:43:07,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:07,929 INFO L225 Difference]: With dead ends: 190 [2019-10-14 21:43:07,929 INFO L226 Difference]: Without dead ends: 117 [2019-10-14 21:43:07,930 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:43:07,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2019-10-14 21:43:07,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2019-10-14 21:43:07,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2019-10-14 21:43:07,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 134 transitions. [2019-10-14 21:43:07,937 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 134 transitions. Word has length 89 [2019-10-14 21:43:07,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:07,937 INFO L462 AbstractCegarLoop]: Abstraction has 116 states and 134 transitions. [2019-10-14 21:43:07,937 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:43:07,937 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 134 transitions. [2019-10-14 21:43:07,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-10-14 21:43:07,938 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:07,938 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 7, 7, 7, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:08,142 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:08,143 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:08,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:08,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1064173218, now seen corresponding path program 9 times [2019-10-14 21:43:08,144 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:08,144 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071068629] [2019-10-14 21:43:08,144 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:08,145 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:08,145 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:08,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:08,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:08,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:08,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:08,370 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 4 proven. 324 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2019-10-14 21:43:08,371 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071068629] [2019-10-14 21:43:08,371 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351026890] [2019-10-14 21:43:08,371 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:08,452 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-14 21:43:08,452 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:08,453 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:43:08,454 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:08,588 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 1 proven. 70 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2019-10-14 21:43:08,588 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:08,589 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 10] total 30 [2019-10-14 21:43:08,589 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119638238] [2019-10-14 21:43:08,589 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-14 21:43:08,589 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:08,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-14 21:43:08,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=614, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:43:08,590 INFO L87 Difference]: Start difference. First operand 116 states and 134 transitions. Second operand 30 states. [2019-10-14 21:43:08,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:08,900 INFO L93 Difference]: Finished difference Result 202 states and 244 transitions. [2019-10-14 21:43:08,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 21:43:08,903 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 91 [2019-10-14 21:43:08,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:08,904 INFO L225 Difference]: With dead ends: 202 [2019-10-14 21:43:08,904 INFO L226 Difference]: Without dead ends: 129 [2019-10-14 21:43:08,905 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=256, Invalid=614, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:43:08,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2019-10-14 21:43:08,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2019-10-14 21:43:08,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-10-14 21:43:08,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 144 transitions. [2019-10-14 21:43:08,913 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 144 transitions. Word has length 91 [2019-10-14 21:43:08,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:08,913 INFO L462 AbstractCegarLoop]: Abstraction has 124 states and 144 transitions. [2019-10-14 21:43:08,913 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-14 21:43:08,913 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 144 transitions. [2019-10-14 21:43:08,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-10-14 21:43:08,914 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:08,914 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 8, 8, 8, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:09,119 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:09,119 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:09,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:09,120 INFO L82 PathProgramCache]: Analyzing trace with hash -561774121, now seen corresponding path program 10 times [2019-10-14 21:43:09,120 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:09,120 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629571299] [2019-10-14 21:43:09,121 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:09,121 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:09,121 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:09,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:09,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:09,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:09,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:09,382 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 4 proven. 361 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-10-14 21:43:09,383 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629571299] [2019-10-14 21:43:09,383 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389859679] [2019-10-14 21:43:09,383 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:09,461 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:43:09,461 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:09,462 INFO L256 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 21:43:09,463 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:09,480 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-10-14 21:43:09,481 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:09,481 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-10-14 21:43:09,481 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39737109] [2019-10-14 21:43:09,482 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 21:43:09,482 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:09,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 21:43:09,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:43:09,483 INFO L87 Difference]: Start difference. First operand 124 states and 144 transitions. Second operand 24 states. [2019-10-14 21:43:09,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:09,643 INFO L93 Difference]: Finished difference Result 206 states and 246 transitions. [2019-10-14 21:43:09,643 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 21:43:09,643 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 96 [2019-10-14 21:43:09,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:09,645 INFO L225 Difference]: With dead ends: 206 [2019-10-14 21:43:09,645 INFO L226 Difference]: Without dead ends: 127 [2019-10-14 21:43:09,646 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:43:09,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2019-10-14 21:43:09,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2019-10-14 21:43:09,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2019-10-14 21:43:09,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 146 transitions. [2019-10-14 21:43:09,652 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 146 transitions. Word has length 96 [2019-10-14 21:43:09,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:09,653 INFO L462 AbstractCegarLoop]: Abstraction has 126 states and 146 transitions. [2019-10-14 21:43:09,653 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-14 21:43:09,653 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 146 transitions. [2019-10-14 21:43:09,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2019-10-14 21:43:09,654 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:09,654 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 8, 8, 8, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:09,858 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:09,858 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:09,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:09,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1102406919, now seen corresponding path program 11 times [2019-10-14 21:43:09,859 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:09,860 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447711219] [2019-10-14 21:43:09,860 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:09,860 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:09,860 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:09,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:10,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:10,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:10,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:10,145 INFO L134 CoverageAnalysis]: Checked inductivity of 509 backedges. 4 proven. 400 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-10-14 21:43:10,145 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447711219] [2019-10-14 21:43:10,145 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39387877] [2019-10-14 21:43:10,145 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:10,373 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 20 check-sat command(s) [2019-10-14 21:43:10,373 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:10,375 INFO L256 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:43:10,379 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:10,524 INFO L134 CoverageAnalysis]: Checked inductivity of 509 backedges. 1 proven. 92 refuted. 0 times theorem prover too weak. 416 trivial. 0 not checked. [2019-10-14 21:43:10,525 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:10,525 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 11] total 33 [2019-10-14 21:43:10,525 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820341374] [2019-10-14 21:43:10,525 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-14 21:43:10,526 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:10,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-14 21:43:10,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=747, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 21:43:10,526 INFO L87 Difference]: Start difference. First operand 126 states and 146 transitions. Second operand 33 states. [2019-10-14 21:43:10,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:10,782 INFO L93 Difference]: Finished difference Result 218 states and 264 transitions. [2019-10-14 21:43:10,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-14 21:43:10,782 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 98 [2019-10-14 21:43:10,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:10,784 INFO L225 Difference]: With dead ends: 218 [2019-10-14 21:43:10,784 INFO L226 Difference]: Without dead ends: 139 [2019-10-14 21:43:10,785 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=309, Invalid=747, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 21:43:10,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2019-10-14 21:43:10,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 134. [2019-10-14 21:43:10,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2019-10-14 21:43:10,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 156 transitions. [2019-10-14 21:43:10,792 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 156 transitions. Word has length 98 [2019-10-14 21:43:10,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:10,793 INFO L462 AbstractCegarLoop]: Abstraction has 134 states and 156 transitions. [2019-10-14 21:43:10,793 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-14 21:43:10,793 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 156 transitions. [2019-10-14 21:43:10,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2019-10-14 21:43:10,794 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:10,794 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 9, 9, 9, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:10,998 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:10,999 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:10,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:11,000 INFO L82 PathProgramCache]: Analyzing trace with hash -1047097128, now seen corresponding path program 12 times [2019-10-14 21:43:11,000 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:11,000 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016302787] [2019-10-14 21:43:11,000 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:11,001 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:11,001 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:11,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:11,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:11,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:11,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:11,382 INFO L134 CoverageAnalysis]: Checked inductivity of 575 backedges. 4 proven. 441 refuted. 0 times theorem prover too weak. 130 trivial. 0 not checked. [2019-10-14 21:43:11,383 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016302787] [2019-10-14 21:43:11,383 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046068903] [2019-10-14 21:43:11,383 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:12,078 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-10-14 21:43:12,079 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:12,081 INFO L256 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 37 conjunts are in the unsatisfiable core [2019-10-14 21:43:12,083 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:12,695 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:43:12,696 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 13 [2019-10-14 21:43:12,696 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:43:12,697 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:43:12,697 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:43:12,698 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:37, output treesize:3 [2019-10-14 21:43:12,719 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:43:12,789 INFO L134 CoverageAnalysis]: Checked inductivity of 575 backedges. 3 proven. 73 refuted. 0 times theorem prover too weak. 499 trivial. 0 not checked. [2019-10-14 21:43:12,789 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:12,789 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 21] total 44 [2019-10-14 21:43:12,789 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678810191] [2019-10-14 21:43:12,789 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-10-14 21:43:12,790 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:12,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-10-14 21:43:12,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=1542, Unknown=0, NotChecked=0, Total=1892 [2019-10-14 21:43:12,790 INFO L87 Difference]: Start difference. First operand 134 states and 156 transitions. Second operand 44 states.