/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/array-examples/standard_init4_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:44:01,956 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:44:01,959 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:44:01,979 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:44:01,979 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:44:01,982 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:44:01,984 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:44:01,996 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:44:01,999 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:44:01,999 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:44:02,002 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:44:02,004 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:44:02,005 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:44:02,008 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:44:02,010 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:44:02,012 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:44:02,014 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:44:02,018 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:44:02,020 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:44:02,023 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:44:02,024 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:44:02,025 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:44:02,026 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:44:02,027 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:44:02,029 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:44:02,037 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:44:02,038 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:44:02,038 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:44:02,039 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 18:44:02,053 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:44:02,053 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:44:02,054 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:44:02,055 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:44:02,055 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:44:02,055 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:44:02,055 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:44:02,056 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:44:02,056 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:44:02,056 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:44:02,056 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:44:02,056 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:44:02,057 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:44:02,057 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:44:02,057 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:44:02,057 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:44:02,057 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:44:02,058 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:44:02,058 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:44:02,058 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:44:02,058 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:44:02,058 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:44:02,059 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:44:02,059 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:44:02,059 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:44:02,059 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:44:02,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:44:02,060 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:44:02,060 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:44:02,347 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:44:02,367 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:44:02,370 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:44:02,372 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:44:02,372 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:44:02,373 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_init4_ground-2.i [2019-11-06 18:44:02,450 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b40e10a0/d4804a81de3947199ea0bbe7d142dc6a/FLAG423c349e1 [2019-11-06 18:44:02,885 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:44:02,888 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_init4_ground-2.i [2019-11-06 18:44:02,895 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b40e10a0/d4804a81de3947199ea0bbe7d142dc6a/FLAG423c349e1 [2019-11-06 18:44:03,271 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b40e10a0/d4804a81de3947199ea0bbe7d142dc6a [2019-11-06 18:44:03,280 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:44:03,282 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:44:03,283 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:44:03,283 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:44:03,287 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:44:03,288 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:44:03" (1/1) ... [2019-11-06 18:44:03,291 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@307bb290 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03, skipping insertion in model container [2019-11-06 18:44:03,291 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:44:03" (1/1) ... [2019-11-06 18:44:03,299 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:44:03,317 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:44:03,531 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:44:03,536 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:44:03,560 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:44:03,582 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:44:03,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03 WrapperNode [2019-11-06 18:44:03,584 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:44:03,585 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:44:03,585 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:44:03,585 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:44:03,676 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03" (1/1) ... [2019-11-06 18:44:03,677 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03" (1/1) ... [2019-11-06 18:44:03,683 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03" (1/1) ... [2019-11-06 18:44:03,684 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03" (1/1) ... [2019-11-06 18:44:03,694 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03" (1/1) ... [2019-11-06 18:44:03,700 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03" (1/1) ... [2019-11-06 18:44:03,701 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03" (1/1) ... [2019-11-06 18:44:03,703 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:44:03,703 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:44:03,703 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:44:03,704 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:44:03,704 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03" (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 18:44:03,763 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:44:03,763 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:44:03,763 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:44:03,763 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:44:03,764 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:44:03,764 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:44:03,764 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:44:03,764 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:44:03,764 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:44:03,764 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:44:03,764 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:44:03,764 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:44:03,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:44:03,988 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:44:03,988 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-11-06 18:44:03,989 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:44:03 BoogieIcfgContainer [2019-11-06 18:44:03,990 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:44:03,991 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:44:03,991 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:44:03,994 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:44:03,994 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:44:03" (1/3) ... [2019-11-06 18:44:03,995 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cd9034 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:44:03, skipping insertion in model container [2019-11-06 18:44:03,995 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:44:03" (2/3) ... [2019-11-06 18:44:03,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cd9034 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:44:03, skipping insertion in model container [2019-11-06 18:44:03,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:44:03" (3/3) ... [2019-11-06 18:44:03,998 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_init4_ground-2.i [2019-11-06 18:44:04,008 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:44:04,015 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:44:04,027 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:44:04,052 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:44:04,052 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:44:04,052 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:44:04,052 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:44:04,052 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:44:04,052 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:44:04,053 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:44:04,053 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:44:04,068 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2019-11-06 18:44:04,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-06 18:44:04,074 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:04,075 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:04,077 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:04,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:04,082 INFO L82 PathProgramCache]: Analyzing trace with hash -1568614638, now seen corresponding path program 1 times [2019-11-06 18:44:04,091 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:04,091 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964316584] [2019-11-06 18:44:04,091 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:04,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:04,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:04,268 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 18:44:04,269 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964316584] [2019-11-06 18:44:04,270 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:44:04,271 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:44:04,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927829300] [2019-11-06 18:44:04,296 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:44:04,297 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:04,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:44:04,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:44:04,320 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2019-11-06 18:44:04,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:04,442 INFO L93 Difference]: Finished difference Result 51 states and 70 transitions. [2019-11-06 18:44:04,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:44:04,444 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-11-06 18:44:04,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:04,451 INFO L225 Difference]: With dead ends: 51 [2019-11-06 18:44:04,452 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 18:44:04,455 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 18:44:04,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 18:44:04,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-06 18:44:04,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 18:44:04,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2019-11-06 18:44:04,495 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 19 [2019-11-06 18:44:04,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:04,495 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2019-11-06 18:44:04,496 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:44:04,496 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2019-11-06 18:44:04,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-06 18:44:04,497 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:04,497 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:04,498 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:04,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:04,499 INFO L82 PathProgramCache]: Analyzing trace with hash -395002610, now seen corresponding path program 1 times [2019-11-06 18:44:04,499 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:04,499 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813054994] [2019-11-06 18:44:04,500 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:04,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:04,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:04,601 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 18:44:04,601 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813054994] [2019-11-06 18:44:04,602 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:44:04,602 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:44:04,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894251971] [2019-11-06 18:44:04,604 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:44:04,604 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:04,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:44:04,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:44:04,608 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 4 states. [2019-11-06 18:44:04,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:04,727 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2019-11-06 18:44:04,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:44:04,728 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2019-11-06 18:44:04,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:04,729 INFO L225 Difference]: With dead ends: 45 [2019-11-06 18:44:04,729 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 18:44:04,731 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 18:44:04,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 18:44:04,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-06 18:44:04,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:44:04,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2019-11-06 18:44:04,748 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 19 [2019-11-06 18:44:04,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:04,748 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2019-11-06 18:44:04,748 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:44:04,749 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2019-11-06 18:44:04,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:44:04,750 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:04,750 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:04,751 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:04,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:04,752 INFO L82 PathProgramCache]: Analyzing trace with hash 47445068, now seen corresponding path program 1 times [2019-11-06 18:44:04,752 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:04,753 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885080513] [2019-11-06 18:44:04,753 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:04,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:04,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:04,886 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:44:04,886 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885080513] [2019-11-06 18:44:04,886 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120735604] [2019-11-06 18:44:04,887 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 18:44:04,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:04,947 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:44:04,958 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:05,006 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:44:05,007 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:05,007 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:44:05,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068603182] [2019-11-06 18:44:05,010 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:44:05,014 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:05,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:44:05,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:44:05,016 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2019-11-06 18:44:05,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:05,147 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2019-11-06 18:44:05,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:44:05,148 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-11-06 18:44:05,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:05,150 INFO L225 Difference]: With dead ends: 52 [2019-11-06 18:44:05,150 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 18:44:05,151 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:44:05,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 18:44:05,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-06 18:44:05,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-06 18:44:05,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2019-11-06 18:44:05,167 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 23 [2019-11-06 18:44:05,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:05,168 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2019-11-06 18:44:05,168 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:44:05,168 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2019-11-06 18:44:05,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-06 18:44:05,169 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:05,169 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:05,370 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:05,371 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:05,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:05,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1810840398, now seen corresponding path program 2 times [2019-11-06 18:44:05,372 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:05,373 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768665059] [2019-11-06 18:44:05,373 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:05,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:05,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:05,476 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:44:05,476 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768665059] [2019-11-06 18:44:05,477 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664146150] [2019-11-06 18:44:05,477 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 18:44:05,527 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:44:05,527 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:05,528 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:44:05,530 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:05,548 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:44:05,548 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:05,550 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:44:05,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941306046] [2019-11-06 18:44:05,551 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:44:05,551 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:05,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:44:05,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:44:05,553 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 7 states. [2019-11-06 18:44:05,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:05,676 INFO L93 Difference]: Finished difference Result 59 states and 70 transitions. [2019-11-06 18:44:05,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:44:05,677 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2019-11-06 18:44:05,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:05,678 INFO L225 Difference]: With dead ends: 59 [2019-11-06 18:44:05,678 INFO L226 Difference]: Without dead ends: 36 [2019-11-06 18:44:05,679 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 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 18:44:05,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-06 18:44:05,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-06 18:44:05,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-06 18:44:05,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-11-06 18:44:05,686 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 27 [2019-11-06 18:44:05,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:05,686 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-11-06 18:44:05,686 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:44:05,687 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-11-06 18:44:05,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 18:44:05,688 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:05,688 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:05,891 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:05,891 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:05,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:05,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1527698548, now seen corresponding path program 3 times [2019-11-06 18:44:05,892 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:05,892 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709856017] [2019-11-06 18:44:05,893 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:05,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:06,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:06,028 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-06 18:44:06,028 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709856017] [2019-11-06 18:44:06,029 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673719569] [2019-11-06 18:44:06,029 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 18:44:06,095 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:44:06,096 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:06,097 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:44:06,101 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:06,115 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-06 18:44:06,115 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:06,116 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 18:44:06,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902429440] [2019-11-06 18:44:06,116 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:44:06,118 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:06,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:44:06,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:44:06,119 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 8 states. [2019-11-06 18:44:06,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:06,242 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2019-11-06 18:44:06,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:44:06,243 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2019-11-06 18:44:06,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:06,244 INFO L225 Difference]: With dead ends: 66 [2019-11-06 18:44:06,244 INFO L226 Difference]: Without dead ends: 40 [2019-11-06 18:44:06,245 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 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 18:44:06,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-06 18:44:06,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-11-06 18:44:06,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-06 18:44:06,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2019-11-06 18:44:06,252 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 31 [2019-11-06 18:44:06,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:06,252 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2019-11-06 18:44:06,252 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:44:06,252 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2019-11-06 18:44:06,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:44:06,253 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:06,253 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:06,457 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:06,458 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:06,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:06,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1451349618, now seen corresponding path program 4 times [2019-11-06 18:44:06,459 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:06,459 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685145662] [2019-11-06 18:44:06,460 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:06,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:06,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:06,585 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-06 18:44:06,585 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685145662] [2019-11-06 18:44:06,585 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478513127] [2019-11-06 18:44:06,586 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 18:44:06,632 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:44:06,633 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:06,634 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:44:06,636 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:06,649 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-06 18:44:06,649 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:06,649 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:44:06,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537648730] [2019-11-06 18:44:06,650 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:44:06,650 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:06,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:44:06,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:44:06,651 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 9 states. [2019-11-06 18:44:06,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:06,781 INFO L93 Difference]: Finished difference Result 73 states and 84 transitions. [2019-11-06 18:44:06,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:44:06,782 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2019-11-06 18:44:06,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:06,783 INFO L225 Difference]: With dead ends: 73 [2019-11-06 18:44:06,783 INFO L226 Difference]: Without dead ends: 44 [2019-11-06 18:44:06,784 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 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 18:44:06,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-06 18:44:06,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-11-06 18:44:06,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-06 18:44:06,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2019-11-06 18:44:06,791 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 35 [2019-11-06 18:44:06,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:06,791 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2019-11-06 18:44:06,791 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:44:06,792 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2019-11-06 18:44:06,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 18:44:06,793 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:06,793 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:06,996 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:06,997 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:06,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:06,998 INFO L82 PathProgramCache]: Analyzing trace with hash 2058629836, now seen corresponding path program 5 times [2019-11-06 18:44:06,998 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:06,999 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945713289] [2019-11-06 18:44:06,999 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:07,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:07,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:07,151 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-06 18:44:07,151 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945713289] [2019-11-06 18:44:07,152 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670561991] [2019-11-06 18:44:07,152 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 18:44:07,451 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-11-06 18:44:07,451 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:07,454 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:44:07,456 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:07,471 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-06 18:44:07,471 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:07,472 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:44:07,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384703649] [2019-11-06 18:44:07,472 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:44:07,473 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:07,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:44:07,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:44:07,473 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 10 states. [2019-11-06 18:44:07,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:07,608 INFO L93 Difference]: Finished difference Result 80 states and 91 transitions. [2019-11-06 18:44:07,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:44:07,609 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2019-11-06 18:44:07,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:07,610 INFO L225 Difference]: With dead ends: 80 [2019-11-06 18:44:07,610 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 18:44:07,611 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 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 18:44:07,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 18:44:07,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2019-11-06 18:44:07,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-06 18:44:07,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2019-11-06 18:44:07,617 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 39 [2019-11-06 18:44:07,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:07,617 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2019-11-06 18:44:07,618 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:44:07,618 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2019-11-06 18:44:07,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-06 18:44:07,619 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:07,619 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:07,824 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:07,824 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:07,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:07,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1129940942, now seen corresponding path program 6 times [2019-11-06 18:44:07,826 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:07,826 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691994567] [2019-11-06 18:44:07,826 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:07,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:07,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:07,921 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-11-06 18:44:07,922 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691994567] [2019-11-06 18:44:07,922 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542902669] [2019-11-06 18:44:07,922 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 18:44:08,284 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-11-06 18:44:08,284 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:08,286 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:44:08,288 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:08,340 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-11-06 18:44:08,340 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:08,341 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 18:44:08,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177330620] [2019-11-06 18:44:08,343 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:44:08,343 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:08,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:44:08,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:44:08,347 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 11 states. [2019-11-06 18:44:08,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:08,463 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2019-11-06 18:44:08,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:44:08,463 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 43 [2019-11-06 18:44:08,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:08,464 INFO L225 Difference]: With dead ends: 87 [2019-11-06 18:44:08,465 INFO L226 Difference]: Without dead ends: 52 [2019-11-06 18:44:08,465 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 44 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 18:44:08,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-06 18:44:08,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-11-06 18:44:08,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-06 18:44:08,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2019-11-06 18:44:08,478 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 43 [2019-11-06 18:44:08,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:08,481 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2019-11-06 18:44:08,481 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:44:08,481 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2019-11-06 18:44:08,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-06 18:44:08,482 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:08,482 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:08,687 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:08,688 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:08,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:08,689 INFO L82 PathProgramCache]: Analyzing trace with hash -2092627444, now seen corresponding path program 7 times [2019-11-06 18:44:08,689 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:08,689 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086596053] [2019-11-06 18:44:08,689 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:08,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:08,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:08,797 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-11-06 18:44:08,798 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086596053] [2019-11-06 18:44:08,798 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086528430] [2019-11-06 18:44:08,798 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 18:44:08,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:08,849 INFO L256 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:44:08,852 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:08,876 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-11-06 18:44:08,876 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:08,876 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:44:08,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785345286] [2019-11-06 18:44:08,877 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:44:08,877 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:08,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:44:08,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:44:08,878 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand 12 states. [2019-11-06 18:44:09,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:09,019 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2019-11-06 18:44:09,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:44:09,019 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 47 [2019-11-06 18:44:09,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:09,020 INFO L225 Difference]: With dead ends: 94 [2019-11-06 18:44:09,020 INFO L226 Difference]: Without dead ends: 56 [2019-11-06 18:44:09,021 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:44:09,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-06 18:44:09,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-11-06 18:44:09,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-06 18:44:09,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2019-11-06 18:44:09,027 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 47 [2019-11-06 18:44:09,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:09,028 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2019-11-06 18:44:09,028 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:44:09,028 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2019-11-06 18:44:09,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-06 18:44:09,029 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:09,029 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:09,233 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:09,234 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:09,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:09,234 INFO L82 PathProgramCache]: Analyzing trace with hash 2092520974, now seen corresponding path program 8 times [2019-11-06 18:44:09,234 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:09,235 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022560642] [2019-11-06 18:44:09,235 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:09,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:09,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:09,398 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-11-06 18:44:09,398 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022560642] [2019-11-06 18:44:09,398 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964552205] [2019-11-06 18:44:09,399 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 18:44:09,463 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:44:09,463 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:09,464 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:44:09,475 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:09,496 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-11-06 18:44:09,497 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:09,497 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:44:09,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433671864] [2019-11-06 18:44:09,498 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:44:09,498 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:09,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:44:09,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:44:09,498 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 13 states. [2019-11-06 18:44:09,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:09,650 INFO L93 Difference]: Finished difference Result 101 states and 112 transitions. [2019-11-06 18:44:09,650 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:44:09,650 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 51 [2019-11-06 18:44:09,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:09,651 INFO L225 Difference]: With dead ends: 101 [2019-11-06 18:44:09,651 INFO L226 Difference]: Without dead ends: 60 [2019-11-06 18:44:09,653 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 52 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 18:44:09,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-06 18:44:09,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2019-11-06 18:44:09,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-06 18:44:09,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2019-11-06 18:44:09,659 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 51 [2019-11-06 18:44:09,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:09,660 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2019-11-06 18:44:09,660 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:44:09,660 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2019-11-06 18:44:09,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-06 18:44:09,661 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:09,661 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:09,872 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:09,872 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:09,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:09,873 INFO L82 PathProgramCache]: Analyzing trace with hash 1825288524, now seen corresponding path program 9 times [2019-11-06 18:44:09,873 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:09,874 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838638550] [2019-11-06 18:44:09,874 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:09,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:10,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:10,078 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2019-11-06 18:44:10,079 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838638550] [2019-11-06 18:44:10,079 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705930387] [2019-11-06 18:44:10,079 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 18:44:11,600 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:44:11,600 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:11,603 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 31 conjunts are in the unsatisfiable core [2019-11-06 18:44:11,605 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:11,683 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 18 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-11-06 18:44:11,684 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:11,684 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 15 [2019-11-06 18:44:11,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817265265] [2019-11-06 18:44:11,686 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:44:11,686 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:11,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:44:11,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:44:11,687 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 15 states. [2019-11-06 18:44:11,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:11,831 INFO L93 Difference]: Finished difference Result 108 states and 119 transitions. [2019-11-06 18:44:11,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:44:11,831 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 55 [2019-11-06 18:44:11,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:11,832 INFO L225 Difference]: With dead ends: 108 [2019-11-06 18:44:11,833 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 18:44:11,833 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:44:11,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 18:44:11,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2019-11-06 18:44:11,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-06 18:44:11,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2019-11-06 18:44:11,841 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 55 [2019-11-06 18:44:11,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:11,841 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2019-11-06 18:44:11,841 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:44:11,842 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2019-11-06 18:44:11,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-11-06 18:44:11,842 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:11,843 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:12,048 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:12,048 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:12,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:12,049 INFO L82 PathProgramCache]: Analyzing trace with hash -1177185202, now seen corresponding path program 10 times [2019-11-06 18:44:12,050 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:12,050 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141210542] [2019-11-06 18:44:12,050 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:12,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:12,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:12,182 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-11-06 18:44:12,183 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141210542] [2019-11-06 18:44:12,183 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433442214] [2019-11-06 18:44:12,183 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 18:44:12,269 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:44:12,269 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:12,271 INFO L256 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:44:12,273 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:12,302 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-11-06 18:44:12,303 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:12,303 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:44:12,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264525599] [2019-11-06 18:44:12,304 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:44:12,304 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:12,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:44:12,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:44:12,304 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand 15 states. [2019-11-06 18:44:12,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:12,500 INFO L93 Difference]: Finished difference Result 115 states and 126 transitions. [2019-11-06 18:44:12,500 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:44:12,500 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 59 [2019-11-06 18:44:12,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:12,502 INFO L225 Difference]: With dead ends: 115 [2019-11-06 18:44:12,502 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 18:44:12,503 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 60 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 18:44:12,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 18:44:12,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2019-11-06 18:44:12,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-11-06 18:44:12,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2019-11-06 18:44:12,510 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 59 [2019-11-06 18:44:12,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:12,510 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2019-11-06 18:44:12,510 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:44:12,510 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2019-11-06 18:44:12,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-06 18:44:12,511 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:12,511 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:12,717 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:12,717 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:12,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:12,717 INFO L82 PathProgramCache]: Analyzing trace with hash 342894732, now seen corresponding path program 11 times [2019-11-06 18:44:12,718 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:12,718 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653156519] [2019-11-06 18:44:12,718 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:12,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:12,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:12,920 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2019-11-06 18:44:12,920 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653156519] [2019-11-06 18:44:12,921 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443757748] [2019-11-06 18:44:12,921 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 18:44:21,296 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-06 18:44:21,296 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:21,307 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:44:21,310 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:21,338 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2019-11-06 18:44:21,338 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:21,338 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 18:44:21,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371252178] [2019-11-06 18:44:21,342 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 18:44:21,342 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:21,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 18:44:21,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:44:21,344 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand 16 states. [2019-11-06 18:44:21,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:21,504 INFO L93 Difference]: Finished difference Result 122 states and 133 transitions. [2019-11-06 18:44:21,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:44:21,505 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2019-11-06 18:44:21,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:21,505 INFO L225 Difference]: With dead ends: 122 [2019-11-06 18:44:21,506 INFO L226 Difference]: Without dead ends: 72 [2019-11-06 18:44:21,506 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 64 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 18:44:21,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-11-06 18:44:21,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2019-11-06 18:44:21,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-11-06 18:44:21,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2019-11-06 18:44:21,512 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 63 [2019-11-06 18:44:21,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:21,513 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2019-11-06 18:44:21,513 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 18:44:21,513 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2019-11-06 18:44:21,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-06 18:44:21,514 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:21,514 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:21,723 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:21,723 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:21,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:21,724 INFO L82 PathProgramCache]: Analyzing trace with hash -1686898, now seen corresponding path program 12 times [2019-11-06 18:44:21,724 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:21,724 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710545027] [2019-11-06 18:44:21,724 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:21,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:21,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:21,939 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2019-11-06 18:44:21,939 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710545027] [2019-11-06 18:44:21,939 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916988001] [2019-11-06 18:44:21,940 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 18:44:47,385 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:44:47,386 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:47,398 INFO L256 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 18:44:47,400 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:47,434 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 36 proven. 78 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2019-11-06 18:44:47,435 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:47,435 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 18 [2019-11-06 18:44:47,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318645232] [2019-11-06 18:44:47,436 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:44:47,436 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:47,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:44:47,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:44:47,437 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 18 states. [2019-11-06 18:44:47,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:47,624 INFO L93 Difference]: Finished difference Result 129 states and 140 transitions. [2019-11-06 18:44:47,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:44:47,624 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 67 [2019-11-06 18:44:47,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:47,625 INFO L225 Difference]: With dead ends: 129 [2019-11-06 18:44:47,625 INFO L226 Difference]: Without dead ends: 76 [2019-11-06 18:44:47,626 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:44:47,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-06 18:44:47,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2019-11-06 18:44:47,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-11-06 18:44:47,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2019-11-06 18:44:47,632 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 67 [2019-11-06 18:44:47,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:47,632 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2019-11-06 18:44:47,633 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:44:47,633 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2019-11-06 18:44:47,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-11-06 18:44:47,633 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:47,634 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:47,844 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:47,844 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:47,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:47,845 INFO L82 PathProgramCache]: Analyzing trace with hash 106590156, now seen corresponding path program 13 times [2019-11-06 18:44:47,845 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:47,845 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930595564] [2019-11-06 18:44:47,845 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:47,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:48,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:48,041 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2019-11-06 18:44:48,041 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930595564] [2019-11-06 18:44:48,041 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155503281] [2019-11-06 18:44:48,042 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 18:44:48,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:48,112 INFO L256 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:44:48,113 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:48,127 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2019-11-06 18:44:48,128 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:48,128 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:44:48,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084333068] [2019-11-06 18:44:48,129 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:44:48,129 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:48,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:44:48,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:44:48,130 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand 18 states. [2019-11-06 18:44:48,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:48,296 INFO L93 Difference]: Finished difference Result 136 states and 147 transitions. [2019-11-06 18:44:48,296 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:44:48,297 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 71 [2019-11-06 18:44:48,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:48,298 INFO L225 Difference]: With dead ends: 136 [2019-11-06 18:44:48,298 INFO L226 Difference]: Without dead ends: 80 [2019-11-06 18:44:48,299 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 72 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 18:44:48,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-11-06 18:44:48,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2019-11-06 18:44:48,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-11-06 18:44:48,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2019-11-06 18:44:48,306 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 71 [2019-11-06 18:44:48,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:48,306 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2019-11-06 18:44:48,306 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:44:48,306 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2019-11-06 18:44:48,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-06 18:44:48,307 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:48,307 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:48,510 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:48,510 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:48,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:48,511 INFO L82 PathProgramCache]: Analyzing trace with hash 1965252814, now seen corresponding path program 14 times [2019-11-06 18:44:48,511 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:48,512 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706955357] [2019-11-06 18:44:48,512 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:48,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:48,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:48,737 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2019-11-06 18:44:48,737 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706955357] [2019-11-06 18:44:48,737 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979555893] [2019-11-06 18:44:48,738 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 18:44:48,834 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:44:48,834 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:48,836 INFO L256 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:44:48,838 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:48,875 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2019-11-06 18:44:48,877 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:48,878 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:44:48,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326556219] [2019-11-06 18:44:48,878 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:44:48,878 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:48,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:44:48,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:44:48,880 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand 19 states. [2019-11-06 18:44:49,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:49,116 INFO L93 Difference]: Finished difference Result 143 states and 154 transitions. [2019-11-06 18:44:49,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:44:49,117 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2019-11-06 18:44:49,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:49,117 INFO L225 Difference]: With dead ends: 143 [2019-11-06 18:44:49,118 INFO L226 Difference]: Without dead ends: 84 [2019-11-06 18:44:49,118 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 76 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 18:44:49,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-06 18:44:49,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-11-06 18:44:49,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-06 18:44:49,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2019-11-06 18:44:49,124 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 75 [2019-11-06 18:44:49,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:49,125 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2019-11-06 18:44:49,125 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:44:49,125 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2019-11-06 18:44:49,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-11-06 18:44:49,125 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:49,126 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:49,329 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:49,330 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:49,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:49,330 INFO L82 PathProgramCache]: Analyzing trace with hash -38631668, now seen corresponding path program 15 times [2019-11-06 18:44:49,330 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:49,330 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238561702] [2019-11-06 18:44:49,330 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:49,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:49,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:49,524 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2019-11-06 18:44:49,525 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238561702] [2019-11-06 18:44:49,525 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233669425] [2019-11-06 18:44:49,525 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