/usr/bin/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/loop-acceleration/array_2-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 21:20:10,398 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 21:20:10,401 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 21:20:10,419 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 21:20:10,419 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 21:20:10,421 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 21:20:10,423 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 21:20:10,435 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 21:20:10,440 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 21:20:10,440 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 21:20:10,441 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 21:20:10,444 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 21:20:10,444 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 21:20:10,446 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 21:20:10,448 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 21:20:10,450 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 21:20:10,451 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 21:20:10,454 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 21:20:10,455 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 21:20:10,460 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 21:20:10,462 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 21:20:10,464 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 21:20:10,467 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 21:20:10,467 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 21:20:10,470 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 21:20:10,483 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 21:20:10,484 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 21:20:10,485 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 21:20:10,485 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 [2019-11-06 21:20:10,506 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 21:20:10,506 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 21:20:10,510 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 21:20:10,511 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 21:20:10,511 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 21:20:10,511 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 21:20:10,511 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 21:20:10,511 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 21:20:10,512 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 21:20:10,512 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 21:20:10,513 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 21:20:10,513 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 21:20:10,513 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 21:20:10,514 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 21:20:10,514 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 21:20:10,514 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 21:20:10,514 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 21:20:10,515 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 21:20:10,515 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 21:20:10,515 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 21:20:10,515 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 21:20:10,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:20:10,516 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 21:20:10,516 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 21:20:10,516 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 21:20:10,516 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 21:20:10,516 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 21:20:10,516 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 21:20:10,517 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 21:20:10,786 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 21:20:10,797 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 21:20:10,801 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 21:20:10,802 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 21:20:10,802 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 21:20:10,803 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_2-1.i [2019-11-06 21:20:10,871 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba3696c3c/af2a6ea0ae5042b18b458d3929bf418e/FLAGe43270b82 [2019-11-06 21:20:11,344 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 21:20:11,345 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1.i [2019-11-06 21:20:11,351 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba3696c3c/af2a6ea0ae5042b18b458d3929bf418e/FLAGe43270b82 [2019-11-06 21:20:11,722 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba3696c3c/af2a6ea0ae5042b18b458d3929bf418e [2019-11-06 21:20:11,729 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 21:20:11,731 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 21:20:11,732 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:11,732 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 21:20:11,735 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 21:20:11,736 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:11" (1/1) ... [2019-11-06 21:20:11,739 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66940745 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11, skipping insertion in model container [2019-11-06 21:20:11,739 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:11" (1/1) ... [2019-11-06 21:20:11,746 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 21:20:11,767 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 21:20:11,940 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:11,951 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 21:20:11,976 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:11,991 INFO L192 MainTranslator]: Completed translation [2019-11-06 21:20:11,991 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11 WrapperNode [2019-11-06 21:20:11,992 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:11,992 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 21:20:11,992 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 21:20:11,993 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 21:20:12,080 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11" (1/1) ... [2019-11-06 21:20:12,081 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11" (1/1) ... [2019-11-06 21:20:12,087 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11" (1/1) ... [2019-11-06 21:20:12,087 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11" (1/1) ... [2019-11-06 21:20:12,095 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11" (1/1) ... [2019-11-06 21:20:12,099 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11" (1/1) ... [2019-11-06 21:20:12,100 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11" (1/1) ... [2019-11-06 21:20:12,102 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 21:20:12,103 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 21:20:12,103 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 21:20:12,103 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 21:20:12,104 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11" (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 [2019-11-06 21:20:12,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 21:20:12,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 21:20:12,153 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 21:20:12,153 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 21:20:12,153 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 21:20:12,153 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 21:20:12,153 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 21:20:12,153 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 21:20:12,153 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 21:20:12,153 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 21:20:12,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 21:20:12,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 21:20:12,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 21:20:12,399 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 21:20:12,400 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 21:20:12,401 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:12 BoogieIcfgContainer [2019-11-06 21:20:12,401 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 21:20:12,403 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 21:20:12,403 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 21:20:12,406 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 21:20:12,406 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:20:11" (1/3) ... [2019-11-06 21:20:12,408 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c840881 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:12, skipping insertion in model container [2019-11-06 21:20:12,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:11" (2/3) ... [2019-11-06 21:20:12,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c840881 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:12, skipping insertion in model container [2019-11-06 21:20:12,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:12" (3/3) ... [2019-11-06 21:20:12,427 INFO L109 eAbstractionObserver]: Analyzing ICFG array_2-1.i [2019-11-06 21:20:12,436 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 21:20:12,442 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 21:20:12,454 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 21:20:12,480 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 21:20:12,480 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 21:20:12,480 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 21:20:12,480 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 21:20:12,480 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 21:20:12,480 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 21:20:12,480 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 21:20:12,480 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 21:20:12,494 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-06 21:20:12,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-06 21:20:12,498 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:12,499 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:12,501 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:12,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:12,505 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2019-11-06 21:20:12,512 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:12,512 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675988930] [2019-11-06 21:20:12,512 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:12,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:12,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:12,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:12,671 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675988930] [2019-11-06 21:20:12,672 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:12,672 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 21:20:12,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653314761] [2019-11-06 21:20:12,678 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:20:12,678 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:12,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:20:12,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:20:12,695 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2019-11-06 21:20:12,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:12,764 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2019-11-06 21:20:12,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:20:12,766 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-06 21:20:12,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:12,775 INFO L225 Difference]: With dead ends: 34 [2019-11-06 21:20:12,775 INFO L226 Difference]: Without dead ends: 14 [2019-11-06 21:20:12,779 INFO L630 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 [2019-11-06 21:20:12,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-06 21:20:12,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-06 21:20:12,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-06 21:20:12,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-11-06 21:20:12,819 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-11-06 21:20:12,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:12,820 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-11-06 21:20:12,820 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:20:12,820 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-11-06 21:20:12,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-06 21:20:12,821 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:12,822 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:12,822 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:12,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:12,823 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2019-11-06 21:20:12,823 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:12,824 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [957737356] [2019-11-06 21:20:12,824 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:12,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:12,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:12,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:12,923 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [957737356] [2019-11-06 21:20:12,923 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:12,923 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 21:20:12,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898721073] [2019-11-06 21:20:12,928 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:20:12,928 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:12,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:20:12,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:20:12,929 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2019-11-06 21:20:12,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:12,985 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-11-06 21:20:12,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:20:12,986 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-11-06 21:20:12,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:12,987 INFO L225 Difference]: With dead ends: 22 [2019-11-06 21:20:12,987 INFO L226 Difference]: Without dead ends: 16 [2019-11-06 21:20:12,989 INFO L630 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 [2019-11-06 21:20:12,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-06 21:20:12,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-11-06 21:20:12,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-06 21:20:12,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-11-06 21:20:12,995 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2019-11-06 21:20:12,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:12,995 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-11-06 21:20:12,995 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:20:12,995 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-11-06 21:20:12,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-06 21:20:12,996 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:12,996 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:12,997 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:12,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:12,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2019-11-06 21:20:12,997 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:12,998 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821574695] [2019-11-06 21:20:12,998 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:13,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:13,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:13,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:13,095 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821574695] [2019-11-06 21:20:13,096 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083771072] [2019-11-06 21:20:13,096 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 [2019-11-06 21:20:13,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:13,145 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 21:20:13,151 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:13,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:13,201 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:13,201 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 21:20:13,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152011174] [2019-11-06 21:20:13,203 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 21:20:13,207 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:13,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 21:20:13,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:20:13,209 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2019-11-06 21:20:13,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:13,263 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2019-11-06 21:20:13,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 21:20:13,263 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2019-11-06 21:20:13,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:13,264 INFO L225 Difference]: With dead ends: 24 [2019-11-06 21:20:13,264 INFO L226 Difference]: Without dead ends: 18 [2019-11-06 21:20:13,265 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:20:13,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-06 21:20:13,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2019-11-06 21:20:13,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-06 21:20:13,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-11-06 21:20:13,270 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2019-11-06 21:20:13,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:13,270 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-11-06 21:20:13,270 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 21:20:13,271 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-11-06 21:20:13,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 21:20:13,271 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:13,272 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:13,472 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:13,473 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:13,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:13,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2019-11-06 21:20:13,473 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:13,473 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724495310] [2019-11-06 21:20:13,474 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:13,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:13,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:13,555 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:13,556 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724495310] [2019-11-06 21:20:13,556 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781537237] [2019-11-06 21:20:13,556 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 [2019-11-06 21:20:13,604 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:13,605 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:13,606 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 21:20:13,607 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:13,630 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:13,631 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:13,631 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 21:20:13,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810625866] [2019-11-06 21:20:13,632 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 21:20:13,633 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:13,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 21:20:13,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:20:13,634 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2019-11-06 21:20:13,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:13,695 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2019-11-06 21:20:13,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 21:20:13,696 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2019-11-06 21:20:13,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:13,697 INFO L225 Difference]: With dead ends: 26 [2019-11-06 21:20:13,697 INFO L226 Difference]: Without dead ends: 20 [2019-11-06 21:20:13,699 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:20:13,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-06 21:20:13,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-11-06 21:20:13,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-06 21:20:13,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-11-06 21:20:13,707 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2019-11-06 21:20:13,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:13,708 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-11-06 21:20:13,708 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 21:20:13,708 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-11-06 21:20:13,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 21:20:13,709 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:13,709 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:13,909 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:13,910 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:13,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:13,911 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2019-11-06 21:20:13,911 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:13,911 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044260360] [2019-11-06 21:20:13,912 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:13,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,034 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:14,034 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044260360] [2019-11-06 21:20:14,034 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1851555784] [2019-11-06 21:20:14,035 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 [2019-11-06 21:20:14,081 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-06 21:20:14,082 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:14,082 INFO L256 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 21:20:14,084 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:14,101 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:14,101 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:14,102 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 21:20:14,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258876846] [2019-11-06 21:20:14,103 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 21:20:14,104 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:14,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 21:20:14,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:20:14,105 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 8 states. [2019-11-06 21:20:14,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:14,163 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2019-11-06 21:20:14,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 21:20:14,163 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2019-11-06 21:20:14,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:14,164 INFO L225 Difference]: With dead ends: 28 [2019-11-06 21:20:14,164 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 21:20:14,165 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:20:14,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 21:20:14,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2019-11-06 21:20:14,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 21:20:14,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2019-11-06 21:20:14,170 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2019-11-06 21:20:14,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:14,170 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2019-11-06 21:20:14,170 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 21:20:14,171 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2019-11-06 21:20:14,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 21:20:14,171 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:14,172 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:14,379 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:14,381 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:14,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:14,382 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2019-11-06 21:20:14,382 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:14,383 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6969823] [2019-11-06 21:20:14,383 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:14,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,501 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:14,501 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6969823] [2019-11-06 21:20:14,501 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314538714] [2019-11-06 21:20:14,502 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 [2019-11-06 21:20:14,540 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:14,540 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:14,541 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 21:20:14,543 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:14,561 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:14,562 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:14,562 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 21:20:14,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818644163] [2019-11-06 21:20:14,563 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:20:14,563 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:14,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:20:14,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:20:14,564 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 9 states. [2019-11-06 21:20:14,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:14,622 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2019-11-06 21:20:14,623 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 21:20:14,623 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2019-11-06 21:20:14,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:14,624 INFO L225 Difference]: With dead ends: 30 [2019-11-06 21:20:14,624 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 21:20:14,625 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:20:14,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 21:20:14,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-11-06 21:20:14,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 21:20:14,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2019-11-06 21:20:14,629 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2019-11-06 21:20:14,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:14,630 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2019-11-06 21:20:14,630 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:20:14,630 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2019-11-06 21:20:14,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-06 21:20:14,631 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:14,631 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:14,834 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:14,835 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:14,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:14,836 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2019-11-06 21:20:14,836 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:14,836 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837847122] [2019-11-06 21:20:14,836 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:14,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,954 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:14,954 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837847122] [2019-11-06 21:20:14,954 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112723813] [2019-11-06 21:20:14,954 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 [2019-11-06 21:20:15,020 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-06 21:20:15,020 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:15,021 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 21:20:15,023 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:15,035 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:15,036 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:15,036 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 21:20:15,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491620264] [2019-11-06 21:20:15,037 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:20:15,037 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:15,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:20:15,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:15,038 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 10 states. [2019-11-06 21:20:15,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:15,108 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2019-11-06 21:20:15,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 21:20:15,108 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 22 [2019-11-06 21:20:15,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:15,109 INFO L225 Difference]: With dead ends: 32 [2019-11-06 21:20:15,109 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 21:20:15,110 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:15,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 21:20:15,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-11-06 21:20:15,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-06 21:20:15,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-11-06 21:20:15,118 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2019-11-06 21:20:15,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:15,118 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-11-06 21:20:15,118 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:20:15,118 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-11-06 21:20:15,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 21:20:15,122 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:15,122 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:15,323 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:15,324 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:15,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:15,325 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2019-11-06 21:20:15,325 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:15,325 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141318485] [2019-11-06 21:20:15,325 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:15,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:15,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:15,432 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:15,432 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141318485] [2019-11-06 21:20:15,433 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122811943] [2019-11-06 21:20:15,433 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 [2019-11-06 21:20:15,495 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 21:20:15,495 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:15,496 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 21:20:15,498 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:15,513 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:15,514 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:15,514 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 21:20:15,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717908823] [2019-11-06 21:20:15,515 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 21:20:15,515 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:15,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 21:20:15,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:20:15,516 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 11 states. [2019-11-06 21:20:15,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:15,608 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2019-11-06 21:20:15,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:20:15,608 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2019-11-06 21:20:15,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:15,609 INFO L225 Difference]: With dead ends: 34 [2019-11-06 21:20:15,610 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 21:20:15,610 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:20:15,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 21:20:15,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-11-06 21:20:15,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 21:20:15,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2019-11-06 21:20:15,616 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2019-11-06 21:20:15,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:15,616 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2019-11-06 21:20:15,616 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 21:20:15,616 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2019-11-06 21:20:15,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-06 21:20:15,617 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:15,617 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:15,826 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:15,827 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:15,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:15,827 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2019-11-06 21:20:15,827 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:15,828 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140908608] [2019-11-06 21:20:15,828 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:15,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:15,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:15,970 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:15,971 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140908608] [2019-11-06 21:20:15,971 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855251207] [2019-11-06 21:20:15,971 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 [2019-11-06 21:20:16,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,027 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 21:20:16,030 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:16,050 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,050 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:16,050 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 21:20:16,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311043822] [2019-11-06 21:20:16,052 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 21:20:16,052 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:16,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 21:20:16,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 21:20:16,053 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 12 states. [2019-11-06 21:20:16,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:16,136 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-11-06 21:20:16,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 21:20:16,136 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2019-11-06 21:20:16,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:16,137 INFO L225 Difference]: With dead ends: 36 [2019-11-06 21:20:16,138 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 21:20:16,140 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 21:20:16,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 21:20:16,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-11-06 21:20:16,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 21:20:16,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2019-11-06 21:20:16,148 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2019-11-06 21:20:16,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:16,148 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2019-11-06 21:20:16,148 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 21:20:16,148 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2019-11-06 21:20:16,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-06 21:20:16,149 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:16,149 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:16,353 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:16,354 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:16,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:16,354 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2019-11-06 21:20:16,354 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:16,355 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633595564] [2019-11-06 21:20:16,355 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:16,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,467 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,467 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633595564] [2019-11-06 21:20:16,468 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556524080] [2019-11-06 21:20:16,468 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 [2019-11-06 21:20:16,516 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:16,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:16,517 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 21:20:16,519 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:16,535 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,536 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:16,536 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 21:20:16,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124193982] [2019-11-06 21:20:16,537 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 21:20:16,538 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:16,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 21:20:16,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:20:16,539 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 13 states. [2019-11-06 21:20:16,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:16,610 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2019-11-06 21:20:16,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 21:20:16,610 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2019-11-06 21:20:16,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:16,611 INFO L225 Difference]: With dead ends: 38 [2019-11-06 21:20:16,611 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 21:20:16,612 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:20:16,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 21:20:16,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-11-06 21:20:16,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 21:20:16,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2019-11-06 21:20:16,617 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2019-11-06 21:20:16,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:16,617 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2019-11-06 21:20:16,617 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 21:20:16,617 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2019-11-06 21:20:16,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-06 21:20:16,618 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:16,618 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:16,829 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:16,830 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:16,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:16,830 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2019-11-06 21:20:16,831 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:16,831 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788008825] [2019-11-06 21:20:16,831 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:16,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,965 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,965 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788008825] [2019-11-06 21:20:16,965 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207267316] [2019-11-06 21:20:16,966 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 [2019-11-06 21:20:17,044 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-06 21:20:17,044 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:17,045 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 21:20:17,047 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:17,060 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,061 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:17,061 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-11-06 21:20:17,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20868611] [2019-11-06 21:20:17,062 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 21:20:17,062 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:17,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 21:20:17,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:20:17,063 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 14 states. [2019-11-06 21:20:17,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:17,147 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2019-11-06 21:20:17,147 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 21:20:17,148 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 30 [2019-11-06 21:20:17,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:17,148 INFO L225 Difference]: With dead ends: 40 [2019-11-06 21:20:17,149 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 21:20:17,149 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:20:17,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 21:20:17,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2019-11-06 21:20:17,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-06 21:20:17,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2019-11-06 21:20:17,154 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2019-11-06 21:20:17,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:17,154 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2019-11-06 21:20:17,154 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 21:20:17,155 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2019-11-06 21:20:17,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 21:20:17,155 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:17,156 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:17,359 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:17,360 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:17,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:17,360 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2019-11-06 21:20:17,360 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:17,360 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492420223] [2019-11-06 21:20:17,361 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:17,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:17,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:17,490 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,490 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492420223] [2019-11-06 21:20:17,490 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562648162] [2019-11-06 21:20:17,490 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:17,531 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:17,531 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:17,532 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 21:20:17,547 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:17,576 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,577 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:17,577 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 21:20:17,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771318784] [2019-11-06 21:20:17,578 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 21:20:17,580 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:17,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 21:20:17,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:20:17,581 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 15 states. [2019-11-06 21:20:17,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:17,671 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2019-11-06 21:20:17,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 21:20:17,672 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 32 [2019-11-06 21:20:17,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:17,673 INFO L225 Difference]: With dead ends: 42 [2019-11-06 21:20:17,673 INFO L226 Difference]: Without dead ends: 36 [2019-11-06 21:20:17,674 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:20:17,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-06 21:20:17,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2019-11-06 21:20:17,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 21:20:17,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2019-11-06 21:20:17,679 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2019-11-06 21:20:17,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:17,680 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2019-11-06 21:20:17,680 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 21:20:17,680 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2019-11-06 21:20:17,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-06 21:20:17,681 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:17,681 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:17,889 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:17,890 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:17,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:17,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2019-11-06 21:20:17,891 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:17,891 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150224050] [2019-11-06 21:20:17,891 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:17,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,028 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,028 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150224050] [2019-11-06 21:20:18,029 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282246218] [2019-11-06 21:20:18,029 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:18,246 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 21:20:18,246 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:18,248 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 21:20:18,249 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:18,279 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,280 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:18,280 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 21:20:18,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662810653] [2019-11-06 21:20:18,281 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 21:20:18,281 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:18,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 21:20:18,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:20:18,281 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 16 states. [2019-11-06 21:20:18,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:18,399 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2019-11-06 21:20:18,399 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 21:20:18,400 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 34 [2019-11-06 21:20:18,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:18,400 INFO L225 Difference]: With dead ends: 44 [2019-11-06 21:20:18,401 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 21:20:18,401 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:20:18,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 21:20:18,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-11-06 21:20:18,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-06 21:20:18,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-11-06 21:20:18,406 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2019-11-06 21:20:18,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:18,407 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-11-06 21:20:18,407 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 21:20:18,407 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-11-06 21:20:18,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-06 21:20:18,408 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:18,408 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:18,617 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:18,618 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:18,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:18,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2019-11-06 21:20:18,619 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:18,620 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831223337] [2019-11-06 21:20:18,620 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:18,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,773 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,774 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831223337] [2019-11-06 21:20:18,774 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20614396] [2019-11-06 21:20:18,774 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:18,961 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 21:20:18,961 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:18,962 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 21:20:18,964 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:18,995 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,995 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:18,995 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-11-06 21:20:18,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685773222] [2019-11-06 21:20:18,996 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 21:20:18,997 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:18,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 21:20:18,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:18,997 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 17 states. [2019-11-06 21:20:19,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:19,105 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2019-11-06 21:20:19,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 21:20:19,106 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2019-11-06 21:20:19,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:19,107 INFO L225 Difference]: With dead ends: 46 [2019-11-06 21:20:19,107 INFO L226 Difference]: Without dead ends: 40 [2019-11-06 21:20:19,108 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:19,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-06 21:20:19,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2019-11-06 21:20:19,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 21:20:19,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2019-11-06 21:20:19,113 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2019-11-06 21:20:19,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:19,113 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2019-11-06 21:20:19,113 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 21:20:19,114 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2019-11-06 21:20:19,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 21:20:19,114 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:19,114 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:19,317 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:19,317 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:19,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:19,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2019-11-06 21:20:19,318 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:19,319 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1755453247] [2019-11-06 21:20:19,319 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:19,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,476 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:19,476 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1755453247] [2019-11-06 21:20:19,477 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201576993] [2019-11-06 21:20:19,477 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:19,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,531 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 21:20:19,536 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:19,555 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:19,555 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:19,555 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 21:20:19,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181194920] [2019-11-06 21:20:19,556 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 21:20:19,556 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:19,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 21:20:19,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:20:19,557 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 18 states. [2019-11-06 21:20:19,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:19,639 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2019-11-06 21:20:19,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 21:20:19,640 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 38 [2019-11-06 21:20:19,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:19,641 INFO L225 Difference]: With dead ends: 48 [2019-11-06 21:20:19,641 INFO L226 Difference]: Without dead ends: 42 [2019-11-06 21:20:19,642 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:20:19,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-06 21:20:19,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2019-11-06 21:20:19,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-06 21:20:19,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2019-11-06 21:20:19,647 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2019-11-06 21:20:19,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:19,647 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2019-11-06 21:20:19,647 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 21:20:19,647 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2019-11-06 21:20:19,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-06 21:20:19,648 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:19,648 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:19,852 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:19,852 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:19,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:19,853 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2019-11-06 21:20:19,853 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:19,853 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866404935] [2019-11-06 21:20:19,854 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:19,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,014 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:20,015 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866404935] [2019-11-06 21:20:20,015 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831598596] [2019-11-06 21:20:20,015 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:20,064 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:20,064 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:20,065 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 21:20:20,066 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:20,081 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:20,081 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:20,081 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 21:20:20,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603947557] [2019-11-06 21:20:20,082 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 21:20:20,082 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:20,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 21:20:20,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 21:20:20,083 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 19 states. [2019-11-06 21:20:20,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:20,201 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2019-11-06 21:20:20,201 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 21:20:20,202 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 40 [2019-11-06 21:20:20,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:20,203 INFO L225 Difference]: With dead ends: 50 [2019-11-06 21:20:20,203 INFO L226 Difference]: Without dead ends: 44 [2019-11-06 21:20:20,204 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 21:20:20,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-06 21:20:20,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-11-06 21:20:20,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 21:20:20,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2019-11-06 21:20:20,210 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2019-11-06 21:20:20,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:20,210 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2019-11-06 21:20:20,210 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 21:20:20,211 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2019-11-06 21:20:20,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-06 21:20:20,211 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:20,212 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:20,412 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:20,413 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:20,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:20,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2019-11-06 21:20:20,413 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:20,414 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624688236] [2019-11-06 21:20:20,414 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:20,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,659 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:20,659 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624688236] [2019-11-06 21:20:20,660 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821811526] [2019-11-06 21:20:20,660 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:20,957 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-06 21:20:20,957 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:20,959 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 21:20:20,960 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:20,988 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:20,988 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:20,989 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 21:20:20,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903132038] [2019-11-06 21:20:20,989 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 21:20:20,989 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:20,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 21:20:20,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:20,993 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 20 states. [2019-11-06 21:20:21,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:21,074 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2019-11-06 21:20:21,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 21:20:21,075 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-11-06 21:20:21,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:21,076 INFO L225 Difference]: With dead ends: 52 [2019-11-06 21:20:21,076 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 21:20:21,077 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:21,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 21:20:21,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-11-06 21:20:21,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 21:20:21,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2019-11-06 21:20:21,082 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2019-11-06 21:20:21,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:21,083 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2019-11-06 21:20:21,083 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 21:20:21,083 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2019-11-06 21:20:21,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 21:20:21,084 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:21,084 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:21,293 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:21,294 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:21,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:21,294 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2019-11-06 21:20:21,295 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:21,295 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689443087] [2019-11-06 21:20:21,295 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:21,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,513 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:21,513 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689443087] [2019-11-06 21:20:21,514 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768196852] [2019-11-06 21:20:21,514 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:21,571 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:21,571 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:21,572 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 21:20:21,573 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:21,593 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:21,593 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:21,594 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 21:20:21,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765756984] [2019-11-06 21:20:21,594 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 21:20:21,594 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:21,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 21:20:21,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:20:21,595 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 21 states. [2019-11-06 21:20:21,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:21,705 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2019-11-06 21:20:21,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 21:20:21,706 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 44 [2019-11-06 21:20:21,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:21,706 INFO L225 Difference]: With dead ends: 54 [2019-11-06 21:20:21,707 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 21:20:21,707 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:20:21,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 21:20:21,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2019-11-06 21:20:21,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-06 21:20:21,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2019-11-06 21:20:21,712 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2019-11-06 21:20:21,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:21,712 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2019-11-06 21:20:21,712 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 21:20:21,713 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2019-11-06 21:20:21,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 21:20:21,713 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:21,713 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:21,917 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:21,917 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:21,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:21,918 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2019-11-06 21:20:21,918 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:21,919 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425164177] [2019-11-06 21:20:21,919 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:21,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,161 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:22,161 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425164177] [2019-11-06 21:20:22,162 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311263386] [2019-11-06 21:20:22,162 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:22,386 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-06 21:20:22,386 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:22,388 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 21:20:22,389 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:22,407 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:22,408 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:22,408 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 21:20:22,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143543746] [2019-11-06 21:20:22,409 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 21:20:22,409 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:22,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 21:20:22,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 21:20:22,410 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 22 states. [2019-11-06 21:20:22,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:22,522 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2019-11-06 21:20:22,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 21:20:22,523 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 46 [2019-11-06 21:20:22,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:22,523 INFO L225 Difference]: With dead ends: 56 [2019-11-06 21:20:22,524 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 21:20:22,524 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 21:20:22,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 21:20:22,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-11-06 21:20:22,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-06 21:20:22,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2019-11-06 21:20:22,528 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2019-11-06 21:20:22,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:22,529 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2019-11-06 21:20:22,529 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 21:20:22,529 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2019-11-06 21:20:22,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 21:20:22,529 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:22,530 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:22,733 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:22,734 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:22,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:22,734 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2019-11-06 21:20:22,735 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:22,735 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832321570] [2019-11-06 21:20:22,735 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:22,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,951 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:22,952 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832321570] [2019-11-06 21:20:22,952 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248191854] [2019-11-06 21:20:22,952 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:23,775 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-11-06 21:20:23,775 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:23,778 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 21:20:23,779 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:23,802 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:23,802 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:23,802 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-11-06 21:20:23,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275131625] [2019-11-06 21:20:23,803 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 21:20:23,803 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:23,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 21:20:23,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:23,804 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 23 states. [2019-11-06 21:20:23,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:23,908 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2019-11-06 21:20:23,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 21:20:23,908 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2019-11-06 21:20:23,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:23,909 INFO L225 Difference]: With dead ends: 58 [2019-11-06 21:20:23,909 INFO L226 Difference]: Without dead ends: 52 [2019-11-06 21:20:23,910 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:23,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-06 21:20:23,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2019-11-06 21:20:23,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 21:20:23,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2019-11-06 21:20:23,914 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2019-11-06 21:20:23,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:23,914 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2019-11-06 21:20:23,915 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 21:20:23,915 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2019-11-06 21:20:23,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-06 21:20:23,915 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:23,915 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:24,126 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:24,127 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:24,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:24,127 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2019-11-06 21:20:24,128 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:24,128 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619950656] [2019-11-06 21:20:24,128 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:24,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:24,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:24,413 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:24,414 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619950656] [2019-11-06 21:20:24,414 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64287047] [2019-11-06 21:20:24,414 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 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 [2019-11-06 21:20:24,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:24,479 INFO L256 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 21:20:24,480 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:24,498 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:24,499 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:24,499 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 21:20:24,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489732921] [2019-11-06 21:20:24,500 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 21:20:24,500 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:24,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 21:20:24,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:20:24,501 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 24 states. [2019-11-06 21:20:24,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:24,616 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-11-06 21:20:24,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 21:20:24,617 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 50 [2019-11-06 21:20:24,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:24,618 INFO L225 Difference]: With dead ends: 60 [2019-11-06 21:20:24,618 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 21:20:24,618 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:20:24,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 21:20:24,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2019-11-06 21:20:24,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-06 21:20:24,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2019-11-06 21:20:24,623 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2019-11-06 21:20:24,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:24,624 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2019-11-06 21:20:24,624 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 21:20:24,624 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2019-11-06 21:20:24,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-06 21:20:24,625 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:24,625 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:24,829 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:24,829 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:24,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:24,829 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2019-11-06 21:20:24,830 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:24,830 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917260769] [2019-11-06 21:20:24,830 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:24,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,095 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:25,095 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917260769] [2019-11-06 21:20:25,095 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975735196] [2019-11-06 21:20:25,095 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 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 [2019-11-06 21:20:25,164 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:25,164 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:25,165 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 21:20:25,166 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:25,183 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:25,183 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:25,183 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-11-06 21:20:25,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344113429] [2019-11-06 21:20:25,184 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 21:20:25,184 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:25,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 21:20:25,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:20:25,185 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 25 states. [2019-11-06 21:20:25,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:25,378 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2019-11-06 21:20:25,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 21:20:25,381 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 52 [2019-11-06 21:20:25,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:25,382 INFO L225 Difference]: With dead ends: 62 [2019-11-06 21:20:25,382 INFO L226 Difference]: Without dead ends: 56 [2019-11-06 21:20:25,383 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:20:25,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-06 21:20:25,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-11-06 21:20:25,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-06 21:20:25,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2019-11-06 21:20:25,387 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2019-11-06 21:20:25,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:25,387 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2019-11-06 21:20:25,387 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 21:20:25,388 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2019-11-06 21:20:25,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-06 21:20:25,388 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:25,388 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:25,596 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:25,597 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:25,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:25,597 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2019-11-06 21:20:25,598 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:25,598 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688635849] [2019-11-06 21:20:25,598 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:25,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:26,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:26,127 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:26,127 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688635849] [2019-11-06 21:20:26,127 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1502786893] [2019-11-06 21:20:26,127 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 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 [2019-11-06 21:20:28,009 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-11-06 21:20:28,010 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:28,013 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 21:20:28,015 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:28,030 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:28,030 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:28,030 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2019-11-06 21:20:28,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646252518] [2019-11-06 21:20:28,031 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-06 21:20:28,031 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:28,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-06 21:20:28,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:20:28,032 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 26 states. [2019-11-06 21:20:28,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:28,144 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2019-11-06 21:20:28,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-06 21:20:28,144 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 54 [2019-11-06 21:20:28,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:28,144 INFO L225 Difference]: With dead ends: 64 [2019-11-06 21:20:28,145 INFO L226 Difference]: Without dead ends: 58 [2019-11-06 21:20:28,145 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:20:28,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-06 21:20:28,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2019-11-06 21:20:28,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-11-06 21:20:28,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2019-11-06 21:20:28,149 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2019-11-06 21:20:28,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:28,149 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2019-11-06 21:20:28,149 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-06 21:20:28,149 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2019-11-06 21:20:28,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-06 21:20:28,150 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:28,150 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:28,355 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:28,355 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:28,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:28,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2019-11-06 21:20:28,356 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:28,356 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028767958] [2019-11-06 21:20:28,356 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:28,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:28,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:28,660 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:28,660 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028767958] [2019-11-06 21:20:28,660 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701116030] [2019-11-06 21:20:28,660 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:28,728 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:28,728 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:28,729 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 21:20:28,730 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:28,746 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:28,746 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:28,747 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-11-06 21:20:28,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767882640] [2019-11-06 21:20:28,747 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 21:20:28,747 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:28,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 21:20:28,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:20:28,748 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 27 states. [2019-11-06 21:20:28,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:28,901 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2019-11-06 21:20:28,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 21:20:28,902 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 56 [2019-11-06 21:20:28,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:28,903 INFO L225 Difference]: With dead ends: 66 [2019-11-06 21:20:28,903 INFO L226 Difference]: Without dead ends: 60 [2019-11-06 21:20:28,904 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:20:28,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-06 21:20:28,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2019-11-06 21:20:28,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-11-06 21:20:28,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2019-11-06 21:20:28,908 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2019-11-06 21:20:28,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:28,909 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2019-11-06 21:20:28,909 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 21:20:28,909 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2019-11-06 21:20:28,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-11-06 21:20:28,910 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:28,910 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:29,110 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:29,111 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:29,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:29,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2019-11-06 21:20:29,112 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:29,112 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656313506] [2019-11-06 21:20:29,112 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:29,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:29,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:29,473 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:29,474 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656313506] [2019-11-06 21:20:29,474 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440358152] [2019-11-06 21:20:29,474 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:29,730 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-11-06 21:20:29,730 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:29,732 INFO L256 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-06 21:20:29,733 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:29,753 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:29,753 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:29,754 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-11-06 21:20:29,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088273252] [2019-11-06 21:20:29,754 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 21:20:29,754 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:29,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 21:20:29,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:20:29,755 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 28 states. [2019-11-06 21:20:29,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:29,899 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2019-11-06 21:20:29,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 21:20:29,900 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 58 [2019-11-06 21:20:29,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:29,901 INFO L225 Difference]: With dead ends: 68 [2019-11-06 21:20:29,901 INFO L226 Difference]: Without dead ends: 62 [2019-11-06 21:20:29,902 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:20:29,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-06 21:20:29,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-11-06 21:20:29,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-06 21:20:29,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2019-11-06 21:20:29,906 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2019-11-06 21:20:29,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:29,906 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2019-11-06 21:20:29,906 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 21:20:29,906 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2019-11-06 21:20:29,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-11-06 21:20:29,907 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:29,907 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:30,112 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:30,112 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:30,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:30,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2019-11-06 21:20:30,113 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:30,113 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510220095] [2019-11-06 21:20:30,114 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:30,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:30,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:30,474 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:30,475 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [510220095] [2019-11-06 21:20:30,475 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874506211] [2019-11-06 21:20:30,475 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:34,629 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-11-06 21:20:34,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:34,634 INFO L256 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 21:20:34,635 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:34,650 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:34,651 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:34,651 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-11-06 21:20:34,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196474665] [2019-11-06 21:20:34,652 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 21:20:34,653 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:34,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 21:20:34,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:20:34,654 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 29 states. [2019-11-06 21:20:34,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:34,835 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2019-11-06 21:20:34,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-06 21:20:34,835 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 60 [2019-11-06 21:20:34,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:34,836 INFO L225 Difference]: With dead ends: 70 [2019-11-06 21:20:34,836 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 21:20:34,837 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:20:34,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 21:20:34,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-11-06 21:20:34,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-11-06 21:20:34,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2019-11-06 21:20:34,841 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2019-11-06 21:20:34,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:34,841 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2019-11-06 21:20:34,841 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 21:20:34,841 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2019-11-06 21:20:34,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-11-06 21:20:34,842 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:34,842 INFO L410 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:35,048 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:35,048 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:35,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:35,048 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2019-11-06 21:20:35,049 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:35,049 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300551305] [2019-11-06 21:20:35,049 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:35,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,383 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:35,383 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300551305] [2019-11-06 21:20:35,383 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370904803] [2019-11-06 21:20:35,383 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:35,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,462 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 21:20:35,463 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:35,496 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:35,497 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:35,497 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-11-06 21:20:35,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797423572] [2019-11-06 21:20:35,498 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 21:20:35,498 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:35,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 21:20:35,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:20:35,499 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 30 states. [2019-11-06 21:20:35,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:35,656 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2019-11-06 21:20:35,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 21:20:35,657 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 62 [2019-11-06 21:20:35,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:35,658 INFO L225 Difference]: With dead ends: 72 [2019-11-06 21:20:35,658 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 21:20:35,659 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:20:35,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 21:20:35,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-11-06 21:20:35,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-11-06 21:20:35,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2019-11-06 21:20:35,664 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2019-11-06 21:20:35,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:35,664 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2019-11-06 21:20:35,664 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 21:20:35,665 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2019-11-06 21:20:35,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-11-06 21:20:35,665 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:35,665 INFO L410 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:35,865 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:35,866 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:35,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:35,866 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2019-11-06 21:20:35,867 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:35,867 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818744960] [2019-11-06 21:20:35,867 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:35,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:36,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:36,247 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:36,247 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818744960] [2019-11-06 21:20:36,247 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710806024] [2019-11-06 21:20:36,247 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:36,349 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:36,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:36,351 INFO L256 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 21:20:36,353 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:36,374 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:36,374 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:36,374 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-11-06 21:20:36,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965700428] [2019-11-06 21:20:36,375 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 21:20:36,375 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:36,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 21:20:36,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:20:36,376 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 31 states. [2019-11-06 21:20:36,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:36,552 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2019-11-06 21:20:36,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 21:20:36,552 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 64 [2019-11-06 21:20:36,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:36,553 INFO L225 Difference]: With dead ends: 74 [2019-11-06 21:20:36,553 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 21:20:36,554 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:20:36,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 21:20:36,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-11-06 21:20:36,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-11-06 21:20:36,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2019-11-06 21:20:36,557 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2019-11-06 21:20:36,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:36,557 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2019-11-06 21:20:36,557 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 21:20:36,557 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2019-11-06 21:20:36,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-11-06 21:20:36,558 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:36,558 INFO L410 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:36,761 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:36,762 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:36,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:36,763 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2019-11-06 21:20:36,763 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:36,763 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251264642] [2019-11-06 21:20:36,763 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:36,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:37,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:37,136 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:37,136 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251264642] [2019-11-06 21:20:37,136 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742723771] [2019-11-06 21:20:37,136 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:42,293 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-11-06 21:20:42,293 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:42,300 INFO L256 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-06 21:20:42,302 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:42,318 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:42,318 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:42,318 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2019-11-06 21:20:42,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440082804] [2019-11-06 21:20:42,319 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-06 21:20:42,319 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:42,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-06 21:20:42,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:20:42,320 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 32 states. [2019-11-06 21:20:42,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:42,501 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2019-11-06 21:20:42,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 21:20:42,501 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 66 [2019-11-06 21:20:42,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:42,502 INFO L225 Difference]: With dead ends: 76 [2019-11-06 21:20:42,502 INFO L226 Difference]: Without dead ends: 70 [2019-11-06 21:20:42,503 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:20:42,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-06 21:20:42,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2019-11-06 21:20:42,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-11-06 21:20:42,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2019-11-06 21:20:42,507 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2019-11-06 21:20:42,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:42,507 INFO L462 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2019-11-06 21:20:42,507 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-06 21:20:42,507 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2019-11-06 21:20:42,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-11-06 21:20:42,508 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:42,508 INFO L410 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:42,714 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:42,715 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:42,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:42,716 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2019-11-06 21:20:42,716 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:42,717 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387375105] [2019-11-06 21:20:42,717 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:42,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:43,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:43,092 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:43,092 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387375105] [2019-11-06 21:20:43,092 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165788583] [2019-11-06 21:20:43,092 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:43,165 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:43,165 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:43,166 INFO L256 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 21:20:43,168 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:43,197 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:43,197 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:43,197 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-11-06 21:20:43,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724256531] [2019-11-06 21:20:43,199 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 21:20:43,199 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:43,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 21:20:43,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:20:43,200 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 33 states. [2019-11-06 21:20:43,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:43,327 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2019-11-06 21:20:43,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-06 21:20:43,328 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 68 [2019-11-06 21:20:43,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:43,329 INFO L225 Difference]: With dead ends: 78 [2019-11-06 21:20:43,329 INFO L226 Difference]: Without dead ends: 72 [2019-11-06 21:20:43,330 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:20:43,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-11-06 21:20:43,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2019-11-06 21:20:43,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-11-06 21:20:43,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2019-11-06 21:20:43,333 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2019-11-06 21:20:43,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:43,334 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2019-11-06 21:20:43,334 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 21:20:43,334 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2019-11-06 21:20:43,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-11-06 21:20:43,334 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:43,335 INFO L410 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:43,538 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:43,539 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:43,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:43,539 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2019-11-06 21:20:43,540 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:43,540 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157795498] [2019-11-06 21:20:43,540 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:43,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:44,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:44,016 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:44,017 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157795498] [2019-11-06 21:20:44,017 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018450961] [2019-11-06 21:20:44,017 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:44,484 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2019-11-06 21:20:44,484 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:44,487 INFO L256 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 31 conjunts are in the unsatisfiable core [2019-11-06 21:20:44,488 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:44,501 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:44,501 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:44,501 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2019-11-06 21:20:44,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392277612] [2019-11-06 21:20:44,501 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 21:20:44,502 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:44,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 21:20:44,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:20:44,502 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 34 states. [2019-11-06 21:20:44,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:44,699 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2019-11-06 21:20:44,699 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-11-06 21:20:44,699 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 70 [2019-11-06 21:20:44,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:44,700 INFO L225 Difference]: With dead ends: 80 [2019-11-06 21:20:44,700 INFO L226 Difference]: Without dead ends: 74 [2019-11-06 21:20:44,701 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:20:44,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-06 21:20:44,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-11-06 21:20:44,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-06 21:20:44,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2019-11-06 21:20:44,705 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2019-11-06 21:20:44,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:44,705 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2019-11-06 21:20:44,705 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 21:20:44,705 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2019-11-06 21:20:44,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-11-06 21:20:44,706 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:44,706 INFO L410 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:44,911 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:44,911 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:44,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:44,911 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2019-11-06 21:20:44,912 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:44,912 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699414992] [2019-11-06 21:20:44,912 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:44,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:45,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:45,350 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:45,350 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699414992] [2019-11-06 21:20:45,350 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870507621] [2019-11-06 21:20:45,350 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:53,589 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2019-11-06 21:20:53,589 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:53,597 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-06 21:20:53,598 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:53,635 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:53,636 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:53,636 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2019-11-06 21:20:53,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79645735] [2019-11-06 21:20:53,637 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-06 21:20:53,637 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:53,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-06 21:20:53,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 21:20:53,638 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 35 states. [2019-11-06 21:20:53,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:53,814 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2019-11-06 21:20:53,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 21:20:53,814 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 72 [2019-11-06 21:20:53,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:53,815 INFO L225 Difference]: With dead ends: 82 [2019-11-06 21:20:53,815 INFO L226 Difference]: Without dead ends: 76 [2019-11-06 21:20:53,816 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 21:20:53,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-06 21:20:53,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2019-11-06 21:20:53,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-11-06 21:20:53,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2019-11-06 21:20:53,819 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2019-11-06 21:20:53,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:53,820 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2019-11-06 21:20:53,820 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-06 21:20:53,820 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2019-11-06 21:20:53,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-11-06 21:20:53,821 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:53,822 INFO L410 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:54,029 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:54,029 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:54,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:54,030 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2019-11-06 21:20:54,030 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:54,030 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465686764] [2019-11-06 21:20:54,030 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:54,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:54,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:54,477 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:54,477 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465686764] [2019-11-06 21:20:54,477 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383550062] [2019-11-06 21:20:54,477 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:54,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:54,566 INFO L256 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 33 conjunts are in the unsatisfiable core [2019-11-06 21:20:54,567 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:54,583 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:54,583 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:54,583 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-11-06 21:20:54,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57930090] [2019-11-06 21:20:54,584 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 21:20:54,584 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:54,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 21:20:54,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 21:20:54,585 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 36 states. [2019-11-06 21:20:54,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:54,787 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-11-06 21:20:54,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-06 21:20:54,788 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 74 [2019-11-06 21:20:54,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:54,789 INFO L225 Difference]: With dead ends: 84 [2019-11-06 21:20:54,789 INFO L226 Difference]: Without dead ends: 78 [2019-11-06 21:20:54,791 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 21:20:54,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-06 21:20:54,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2019-11-06 21:20:54,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-11-06 21:20:54,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2019-11-06 21:20:54,795 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2019-11-06 21:20:54,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:54,796 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2019-11-06 21:20:54,796 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 21:20:54,796 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2019-11-06 21:20:54,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-11-06 21:20:54,796 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:54,796 INFO L410 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:54,997 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:54,997 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:54,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:54,998 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2019-11-06 21:20:54,998 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:54,998 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245643376] [2019-11-06 21:20:54,998 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:55,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:55,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:55,479 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:55,479 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245643376] [2019-11-06 21:20:55,479 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714142355] [2019-11-06 21:20:55,479 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:55,567 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:55,568 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:55,569 INFO L256 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-06 21:20:55,570 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:55,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:55,587 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:55,587 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2019-11-06 21:20:55,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110998323] [2019-11-06 21:20:55,588 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-06 21:20:55,588 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:55,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-06 21:20:55,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 21:20:55,589 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 37 states. [2019-11-06 21:20:55,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:55,757 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2019-11-06 21:20:55,758 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-06 21:20:55,758 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 76 [2019-11-06 21:20:55,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:55,759 INFO L225 Difference]: With dead ends: 86 [2019-11-06 21:20:55,759 INFO L226 Difference]: Without dead ends: 80 [2019-11-06 21:20:55,760 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 21:20:55,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-11-06 21:20:55,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2019-11-06 21:20:55,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-11-06 21:20:55,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2019-11-06 21:20:55,764 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2019-11-06 21:20:55,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:55,764 INFO L462 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2019-11-06 21:20:55,764 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-06 21:20:55,764 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2019-11-06 21:20:55,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-11-06 21:20:55,764 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:55,765 INFO L410 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:55,965 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:55,965 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:55,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:55,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2019-11-06 21:20:55,966 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:55,967 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791934064] [2019-11-06 21:20:55,967 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:55,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:56,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:56,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:56,815 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791934064] [2019-11-06 21:20:56,816 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062668561] [2019-11-06 21:20:56,816 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true