/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_copy2_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:24:10,536 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:24:10,541 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:24:10,600 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:24:10,601 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:24:10,606 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:24:10,610 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:24:10,616 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:24:10,620 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:24:10,622 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:24:10,623 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:24:10,625 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-12-21 21:24:10,670 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:24:10,671 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:24:10,672 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:24:10,679 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:24:10,706 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:24:10,706 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:24:10,708 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:24:10,708 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:24:10,709 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:24:10,709 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:24:10,709 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:24:10,710 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:24:10,710 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:24:10,710 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:24:10,710 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:24:10,710 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:24:10,711 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:24:10,711 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:24:10,711 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:24:10,711 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:24:10,712 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:24:10,712 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:24:10,712 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:24:10,712 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:24:10,713 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:24:10,713 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:24:10,713 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:24:10,713 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:24:10,714 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:24:10,714 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:24:11,113 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:24:11,150 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:24:11,153 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:24:11,154 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:24:11,155 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:24:11,156 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copy2_ground-2.i [2020-12-21 21:24:11,250 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fbe86086b/3a08ecf58e4b4a509ab4fe7eb6cb8a27/FLAGf61d26b12 [2020-12-21 21:24:11,861 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:24:11,862 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy2_ground-2.i [2020-12-21 21:24:11,869 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fbe86086b/3a08ecf58e4b4a509ab4fe7eb6cb8a27/FLAGf61d26b12 [2020-12-21 21:24:12,215 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fbe86086b/3a08ecf58e4b4a509ab4fe7eb6cb8a27 [2020-12-21 21:24:12,218 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:24:12,222 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:24:12,226 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:12,227 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:24:12,231 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:24:12,232 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,235 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26f3f7dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12, skipping insertion in model container [2020-12-21 21:24:12,235 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,244 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:24:12,266 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:24:12,457 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy2_ground-2.i[816,829] [2020-12-21 21:24:12,475 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:12,484 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:24:12,499 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy2_ground-2.i[816,829] [2020-12-21 21:24:12,508 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:12,528 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:24:12,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12 WrapperNode [2020-12-21 21:24:12,529 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:12,530 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:12,530 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:24:12,531 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:24:12,540 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,552 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,586 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:12,592 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:24:12,592 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:24:12,592 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:24:12,601 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,604 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,604 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,610 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,615 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,617 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (1/1) ... [2020-12-21 21:24:12,620 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:24:12,621 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:24:12,621 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:24:12,621 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:24:12,622 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (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 [2020-12-21 21:24:12,728 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:24:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:24:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:24:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:24:12,729 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:24:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:24:12,730 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:24:13,101 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:24:13,101 INFO L299 CfgBuilder]: Removed 10 assume(true) statements. [2020-12-21 21:24:13,107 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:13 BoogieIcfgContainer [2020-12-21 21:24:13,111 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:24:13,113 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:24:13,113 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:24:13,120 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:24:13,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:24:12" (1/3) ... [2020-12-21 21:24:13,122 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35640f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:13, skipping insertion in model container [2020-12-21 21:24:13,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:12" (2/3) ... [2020-12-21 21:24:13,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35640f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:13, skipping insertion in model container [2020-12-21 21:24:13,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:13" (3/3) ... [2020-12-21 21:24:13,131 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copy2_ground-2.i [2020-12-21 21:24:13,142 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:24:13,146 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:24:13,166 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:24:13,195 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:24:13,195 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:24:13,195 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:24:13,196 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:24:13,196 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:24:13,196 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:24:13,196 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:24:13,196 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:24:13,211 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-12-21 21:24:13,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-21 21:24:13,217 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:13,218 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:13,218 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:13,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:13,224 INFO L82 PathProgramCache]: Analyzing trace with hash -779788197, now seen corresponding path program 1 times [2020-12-21 21:24:13,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:13,235 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323388142] [2020-12-21 21:24:13,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:13,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:13,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:24:13,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323388142] [2020-12-21 21:24:13,484 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:24:13,484 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:24:13,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150316845] [2020-12-21 21:24:13,491 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:13,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:13,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:13,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:13,512 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-12-21 21:24:13,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:13,548 INFO L93 Difference]: Finished difference Result 40 states and 56 transitions. [2020-12-21 21:24:13,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:13,550 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-12-21 21:24:13,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:13,560 INFO L225 Difference]: With dead ends: 40 [2020-12-21 21:24:13,560 INFO L226 Difference]: Without dead ends: 19 [2020-12-21 21:24:13,563 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:13,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-21 21:24:13,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-12-21 21:24:13,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-21 21:24:13,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2020-12-21 21:24:13,603 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 11 [2020-12-21 21:24:13,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:13,603 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2020-12-21 21:24:13,603 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:13,604 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2020-12-21 21:24:13,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-21 21:24:13,604 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:13,605 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:13,605 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:24:13,605 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:13,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:13,606 INFO L82 PathProgramCache]: Analyzing trace with hash 383923737, now seen corresponding path program 1 times [2020-12-21 21:24:13,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:13,607 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464208243] [2020-12-21 21:24:13,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:13,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:13,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:24:13,722 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464208243] [2020-12-21 21:24:13,723 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612988475] [2020-12-21 21:24:13,723 INFO L95 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 [2020-12-21 21:24:13,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:13,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-21 21:24:13,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:13,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:24:13,904 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-21 21:24:13,904 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2020-12-21 21:24:13,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038078982] [2020-12-21 21:24:13,906 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:13,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:13,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:13,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:13,911 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand 3 states. [2020-12-21 21:24:13,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:13,952 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2020-12-21 21:24:13,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:13,952 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-12-21 21:24:13,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:13,953 INFO L225 Difference]: With dead ends: 32 [2020-12-21 21:24:13,953 INFO L226 Difference]: Without dead ends: 22 [2020-12-21 21:24:13,954 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:13,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-21 21:24:13,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2020-12-21 21:24:13,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-21 21:24:13,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2020-12-21 21:24:13,960 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 13 [2020-12-21 21:24:13,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:13,960 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2020-12-21 21:24:13,960 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:13,960 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2020-12-21 21:24:13,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:24:13,961 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:13,961 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:14,175 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:24:14,176 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:14,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:14,178 INFO L82 PathProgramCache]: Analyzing trace with hash 1602849365, now seen corresponding path program 1 times [2020-12-21 21:24:14,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:14,179 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875190212] [2020-12-21 21:24:14,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:14,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:14,231 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-21 21:24:14,231 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875190212] [2020-12-21 21:24:14,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661509263] [2020-12-21 21:24:14,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-12-21 21:24:14,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:14,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:24:14,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:14,356 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-21 21:24:14,356 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:14,356 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:24:14,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675097347] [2020-12-21 21:24:14,357 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:24:14,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:14,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:24:14,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:14,359 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand 5 states. [2020-12-21 21:24:14,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:14,382 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2020-12-21 21:24:14,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:24:14,383 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-12-21 21:24:14,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:14,384 INFO L225 Difference]: With dead ends: 38 [2020-12-21 21:24:14,384 INFO L226 Difference]: Without dead ends: 23 [2020-12-21 21:24:14,385 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:14,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-21 21:24:14,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-12-21 21:24:14,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-21 21:24:14,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-12-21 21:24:14,390 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 17 [2020-12-21 21:24:14,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:14,391 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-12-21 21:24:14,391 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:24:14,391 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-12-21 21:24:14,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-21 21:24:14,392 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:14,392 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:14,606 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:14,607 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:14,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:14,609 INFO L82 PathProgramCache]: Analyzing trace with hash 34773395, now seen corresponding path program 2 times [2020-12-21 21:24:14,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:14,610 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855431198] [2020-12-21 21:24:14,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:14,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:14,695 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-21 21:24:14,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855431198] [2020-12-21 21:24:14,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [233176924] [2020-12-21 21:24:14,696 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2020-12-21 21:24:14,761 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:14,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:14,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:14,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:14,811 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-21 21:24:14,812 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:14,812 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2020-12-21 21:24:14,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630321570] [2020-12-21 21:24:14,813 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:24:14,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:14,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:24:14,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:14,814 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 7 states. [2020-12-21 21:24:14,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:14,877 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2020-12-21 21:24:14,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:24:14,878 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-12-21 21:24:14,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:14,879 INFO L225 Difference]: With dead ends: 46 [2020-12-21 21:24:14,879 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 21:24:14,880 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:14,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 21:24:14,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-12-21 21:24:14,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 21:24:14,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-12-21 21:24:14,886 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 19 [2020-12-21 21:24:14,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:14,887 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-12-21 21:24:14,887 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:24:14,887 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-12-21 21:24:14,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 21:24:14,888 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:14,888 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:15,103 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:15,104 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:15,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:15,106 INFO L82 PathProgramCache]: Analyzing trace with hash -1324303987, now seen corresponding path program 3 times [2020-12-21 21:24:15,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:15,107 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776238408] [2020-12-21 21:24:15,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:15,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:15,203 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-21 21:24:15,203 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776238408] [2020-12-21 21:24:15,204 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432427650] [2020-12-21 21:24:15,204 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2020-12-21 21:24:15,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:24:15,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:15,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:15,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:15,354 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-12-21 21:24:15,354 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:15,355 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2020-12-21 21:24:15,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194630606] [2020-12-21 21:24:15,356 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:24:15,356 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:15,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:24:15,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:24:15,358 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 9 states. [2020-12-21 21:24:15,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:15,473 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-12-21 21:24:15,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:24:15,473 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-12-21 21:24:15,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:15,476 INFO L225 Difference]: With dead ends: 56 [2020-12-21 21:24:15,477 INFO L226 Difference]: Without dead ends: 37 [2020-12-21 21:24:15,478 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:24:15,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-21 21:24:15,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-12-21 21:24:15,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-21 21:24:15,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2020-12-21 21:24:15,502 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 25 [2020-12-21 21:24:15,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:15,502 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2020-12-21 21:24:15,502 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:24:15,503 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2020-12-21 21:24:15,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-21 21:24:15,506 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:15,506 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:15,721 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:15,722 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:15,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:15,722 INFO L82 PathProgramCache]: Analyzing trace with hash -288016889, now seen corresponding path program 4 times [2020-12-21 21:24:15,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:15,726 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451274988] [2020-12-21 21:24:15,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:15,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:15,862 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-21 21:24:15,863 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451274988] [2020-12-21 21:24:15,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1826119029] [2020-12-21 21:24:15,864 INFO L93 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 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 [2020-12-21 21:24:15,938 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:15,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:15,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:24:15,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-21 21:24:16,043 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:16,048 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:24:16,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195485927] [2020-12-21 21:24:16,050 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:24:16,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:16,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:24:16,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:24:16,051 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 8 states. [2020-12-21 21:24:16,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:16,081 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2020-12-21 21:24:16,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:24:16,082 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-12-21 21:24:16,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:16,082 INFO L225 Difference]: With dead ends: 60 [2020-12-21 21:24:16,082 INFO L226 Difference]: Without dead ends: 37 [2020-12-21 21:24:16,083 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:24:16,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-21 21:24:16,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-12-21 21:24:16,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-21 21:24:16,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-12-21 21:24:16,089 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 31 [2020-12-21 21:24:16,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:16,089 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-12-21 21:24:16,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:24:16,089 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-12-21 21:24:16,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-21 21:24:16,090 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:16,090 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:16,305 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:24:16,306 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:16,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:16,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1946435387, now seen corresponding path program 5 times [2020-12-21 21:24:16,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:16,308 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721257883] [2020-12-21 21:24:16,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:16,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:16,411 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-21 21:24:16,412 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721257883] [2020-12-21 21:24:16,412 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932398328] [2020-12-21 21:24:16,412 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2020-12-21 21:24:16,707 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-21 21:24:16,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:16,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:24:16,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:16,772 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-12-21 21:24:16,772 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:16,772 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2020-12-21 21:24:16,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373973261] [2020-12-21 21:24:16,773 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:24:16,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:16,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:24:16,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:16,775 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 12 states. [2020-12-21 21:24:16,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:16,865 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2020-12-21 21:24:16,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:24:16,866 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-12-21 21:24:16,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:16,866 INFO L225 Difference]: With dead ends: 68 [2020-12-21 21:24:16,867 INFO L226 Difference]: Without dead ends: 45 [2020-12-21 21:24:16,867 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:16,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-12-21 21:24:16,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-12-21 21:24:16,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-21 21:24:16,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2020-12-21 21:24:16,873 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 33 [2020-12-21 21:24:16,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:16,874 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2020-12-21 21:24:16,874 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:24:16,874 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2020-12-21 21:24:16,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-21 21:24:16,875 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:16,875 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:17,089 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:17,090 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:17,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:17,092 INFO L82 PathProgramCache]: Analyzing trace with hash -287853761, now seen corresponding path program 6 times [2020-12-21 21:24:17,092 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:17,093 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001104881] [2020-12-21 21:24:17,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:17,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:17,203 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-12-21 21:24:17,204 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001104881] [2020-12-21 21:24:17,204 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604655060] [2020-12-21 21:24:17,204 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2020-12-21 21:24:17,323 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:24:17,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:17,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:24:17,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:17,448 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-12-21 21:24:17,448 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:17,450 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 14 [2020-12-21 21:24:17,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348573158] [2020-12-21 21:24:17,450 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:24:17,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:17,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:24:17,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:24:17,452 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 14 states. [2020-12-21 21:24:17,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:17,554 INFO L93 Difference]: Finished difference Result 78 states and 86 transitions. [2020-12-21 21:24:17,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:24:17,555 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-12-21 21:24:17,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:17,556 INFO L225 Difference]: With dead ends: 78 [2020-12-21 21:24:17,556 INFO L226 Difference]: Without dead ends: 51 [2020-12-21 21:24:17,557 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:24:17,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-21 21:24:17,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-12-21 21:24:17,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-21 21:24:17,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2020-12-21 21:24:17,563 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 39 [2020-12-21 21:24:17,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:17,563 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2020-12-21 21:24:17,563 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:24:17,563 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2020-12-21 21:24:17,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 21:24:17,565 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:17,565 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:17,781 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:17,781 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:17,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:17,783 INFO L82 PathProgramCache]: Analyzing trace with hash 2091000377, now seen corresponding path program 7 times [2020-12-21 21:24:17,786 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:17,786 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143104762] [2020-12-21 21:24:17,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:17,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:17,973 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-12-21 21:24:17,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143104762] [2020-12-21 21:24:17,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235931909] [2020-12-21 21:24:17,974 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2020-12-21 21:24:18,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:18,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:24:18,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:18,114 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-12-21 21:24:18,115 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:18,115 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:24:18,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400737101] [2020-12-21 21:24:18,116 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:24:18,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:18,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:24:18,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:18,117 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 11 states. [2020-12-21 21:24:18,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:18,158 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-12-21 21:24:18,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:24:18,158 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-12-21 21:24:18,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:18,159 INFO L225 Difference]: With dead ends: 82 [2020-12-21 21:24:18,159 INFO L226 Difference]: Without dead ends: 51 [2020-12-21 21:24:18,160 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:18,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-21 21:24:18,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2020-12-21 21:24:18,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-21 21:24:18,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2020-12-21 21:24:18,166 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 45 [2020-12-21 21:24:18,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:18,166 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2020-12-21 21:24:18,166 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:24:18,166 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2020-12-21 21:24:18,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-21 21:24:18,168 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:18,168 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:18,381 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:24:18,382 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:18,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:18,383 INFO L82 PathProgramCache]: Analyzing trace with hash 392693879, now seen corresponding path program 8 times [2020-12-21 21:24:18,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:18,384 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077914461] [2020-12-21 21:24:18,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:18,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:18,505 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-12-21 21:24:18,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077914461] [2020-12-21 21:24:18,506 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200044777] [2020-12-21 21:24:18,506 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2020-12-21 21:24:18,610 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:18,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:18,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:24:18,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:18,716 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-12-21 21:24:18,717 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:18,717 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:24:18,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235738039] [2020-12-21 21:24:18,718 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:24:18,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:18,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:24:18,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:18,719 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 12 states. [2020-12-21 21:24:18,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:18,754 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-12-21 21:24:18,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:24:18,755 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 47 [2020-12-21 21:24:18,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:18,756 INFO L225 Difference]: With dead ends: 84 [2020-12-21 21:24:18,756 INFO L226 Difference]: Without dead ends: 53 [2020-12-21 21:24:18,756 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:18,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-21 21:24:18,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2020-12-21 21:24:18,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:24:18,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2020-12-21 21:24:18,762 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 47 [2020-12-21 21:24:18,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:18,762 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2020-12-21 21:24:18,762 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:24:18,762 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2020-12-21 21:24:18,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:24:18,763 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:18,763 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:18,977 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:18,978 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:18,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:18,978 INFO L82 PathProgramCache]: Analyzing trace with hash 407721781, now seen corresponding path program 9 times [2020-12-21 21:24:18,979 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:18,979 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537167364] [2020-12-21 21:24:18,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:19,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:19,131 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-12-21 21:24:19,131 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537167364] [2020-12-21 21:24:19,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118989045] [2020-12-21 21:24:19,132 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2020-12-21 21:24:19,306 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-21 21:24:19,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:19,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:24:19,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:19,437 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-12-21 21:24:19,437 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:19,437 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2020-12-21 21:24:19,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748678114] [2020-12-21 21:24:19,438 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:24:19,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:19,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:24:19,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:19,442 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 18 states. [2020-12-21 21:24:19,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:19,588 INFO L93 Difference]: Finished difference Result 92 states and 100 transitions. [2020-12-21 21:24:19,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:24:19,589 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 49 [2020-12-21 21:24:19,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:19,590 INFO L225 Difference]: With dead ends: 92 [2020-12-21 21:24:19,590 INFO L226 Difference]: Without dead ends: 61 [2020-12-21 21:24:19,592 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:19,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-12-21 21:24:19,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-12-21 21:24:19,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-21 21:24:19,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2020-12-21 21:24:19,614 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 49 [2020-12-21 21:24:19,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:19,615 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2020-12-21 21:24:19,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:24:19,615 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2020-12-21 21:24:19,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-21 21:24:19,617 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:19,620 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:19,835 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:19,836 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:19,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:19,837 INFO L82 PathProgramCache]: Analyzing trace with hash -589679185, now seen corresponding path program 10 times [2020-12-21 21:24:19,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:19,837 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247886035] [2020-12-21 21:24:19,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:19,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:20,004 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-12-21 21:24:20,004 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247886035] [2020-12-21 21:24:20,005 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706486144] [2020-12-21 21:24:20,005 INFO L93 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 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 [2020-12-21 21:24:20,080 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:20,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:20,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:24:20,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:20,156 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-12-21 21:24:20,157 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:20,157 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 21:24:20,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301004252] [2020-12-21 21:24:20,158 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:24:20,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:20,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:24:20,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:24:20,159 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 14 states. [2020-12-21 21:24:20,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:20,205 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-12-21 21:24:20,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:24:20,206 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 55 [2020-12-21 21:24:20,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:20,207 INFO L225 Difference]: With dead ends: 96 [2020-12-21 21:24:20,207 INFO L226 Difference]: Without dead ends: 61 [2020-12-21 21:24:20,207 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:24:20,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-12-21 21:24:20,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2020-12-21 21:24:20,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-21 21:24:20,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2020-12-21 21:24:20,213 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 55 [2020-12-21 21:24:20,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:20,214 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2020-12-21 21:24:20,214 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:24:20,214 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2020-12-21 21:24:20,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-21 21:24:20,215 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:20,215 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:20,429 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:24:20,430 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:20,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:20,431 INFO L82 PathProgramCache]: Analyzing trace with hash 224126573, now seen corresponding path program 11 times [2020-12-21 21:24:20,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:20,431 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480689626] [2020-12-21 21:24:20,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:20,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:20,603 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-12-21 21:24:20,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480689626] [2020-12-21 21:24:20,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556401300] [2020-12-21 21:24:20,604 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2020-12-21 21:24:23,852 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-21 21:24:23,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:23,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:24:23,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:24,056 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2020-12-21 21:24:24,056 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:24,056 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9] total 21 [2020-12-21 21:24:24,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031157540] [2020-12-21 21:24:24,057 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:24:24,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:24,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:24:24,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=294, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:24:24,059 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand 21 states. [2020-12-21 21:24:24,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:24,210 INFO L93 Difference]: Finished difference Result 104 states and 112 transitions. [2020-12-21 21:24:24,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 21:24:24,210 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 57 [2020-12-21 21:24:24,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:24,211 INFO L225 Difference]: With dead ends: 104 [2020-12-21 21:24:24,211 INFO L226 Difference]: Without dead ends: 69 [2020-12-21 21:24:24,212 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=294, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:24:24,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-12-21 21:24:24,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-12-21 21:24:24,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-21 21:24:24,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 69 transitions. [2020-12-21 21:24:24,218 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 69 transitions. Word has length 57 [2020-12-21 21:24:24,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:24,219 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 69 transitions. [2020-12-21 21:24:24,219 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:24:24,219 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 69 transitions. [2020-12-21 21:24:24,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-21 21:24:24,220 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:24,220 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:24,433 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:24:24,434 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:24,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:24,435 INFO L82 PathProgramCache]: Analyzing trace with hash 1552038631, now seen corresponding path program 12 times [2020-12-21 21:24:24,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:24,436 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624427091] [2020-12-21 21:24:24,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:24,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:24,600 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2020-12-21 21:24:24,601 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624427091] [2020-12-21 21:24:24,601 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608342291] [2020-12-21 21:24:24,601 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2020-12-21 21:24:25,572 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 21:24:25,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:25,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:24:25,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:25,769 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 193 trivial. 0 not checked. [2020-12-21 21:24:25,770 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:25,770 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 23 [2020-12-21 21:24:25,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388391328] [2020-12-21 21:24:25,771 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-21 21:24:25,771 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:25,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-21 21:24:25,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:24:25,772 INFO L87 Difference]: Start difference. First operand 66 states and 69 transitions. Second operand 23 states. [2020-12-21 21:24:25,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:25,930 INFO L93 Difference]: Finished difference Result 114 states and 122 transitions. [2020-12-21 21:24:25,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-21 21:24:25,930 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 63 [2020-12-21 21:24:25,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:25,931 INFO L225 Difference]: With dead ends: 114 [2020-12-21 21:24:25,931 INFO L226 Difference]: Without dead ends: 75 [2020-12-21 21:24:25,932 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:24:25,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-12-21 21:24:25,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-12-21 21:24:25,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-12-21 21:24:25,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2020-12-21 21:24:25,938 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 63 [2020-12-21 21:24:25,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:25,938 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2020-12-21 21:24:25,938 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-21 21:24:25,939 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2020-12-21 21:24:25,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-12-21 21:24:25,939 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:25,940 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:26,155 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:24:26,156 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:26,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:26,157 INFO L82 PathProgramCache]: Analyzing trace with hash -670200863, now seen corresponding path program 13 times [2020-12-21 21:24:26,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:26,158 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376569167] [2020-12-21 21:24:26,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:26,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,348 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-12-21 21:24:26,348 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376569167] [2020-12-21 21:24:26,349 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873311204] [2020-12-21 21:24:26,349 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2020-12-21 21:24:26,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:24:26,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:26,532 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-12-21 21:24:26,533 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:26,533 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:24:26,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208728541] [2020-12-21 21:24:26,534 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:24:26,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:26,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:24:26,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:24:26,535 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 17 states. [2020-12-21 21:24:26,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:26,593 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-12-21 21:24:26,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:24:26,594 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 69 [2020-12-21 21:24:26,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:26,594 INFO L225 Difference]: With dead ends: 118 [2020-12-21 21:24:26,595 INFO L226 Difference]: Without dead ends: 75 [2020-12-21 21:24:26,595 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:24:26,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-12-21 21:24:26,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2020-12-21 21:24:26,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-12-21 21:24:26,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2020-12-21 21:24:26,600 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 69 [2020-12-21 21:24:26,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:26,601 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2020-12-21 21:24:26,601 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:24:26,601 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2020-12-21 21:24:26,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-12-21 21:24:26,602 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:26,602 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:26,815 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:26,816 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:26,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:26,817 INFO L82 PathProgramCache]: Analyzing trace with hash 481564703, now seen corresponding path program 14 times [2020-12-21 21:24:26,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:26,817 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994821418] [2020-12-21 21:24:26,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:26,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:27,007 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-12-21 21:24:27,007 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994821418] [2020-12-21 21:24:27,007 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935370929] [2020-12-21 21:24:27,008 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2020-12-21 21:24:27,088 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:27,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:27,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:24:27,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:27,203 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-12-21 21:24:27,204 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:27,204 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:24:27,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519607480] [2020-12-21 21:24:27,205 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:24:27,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:27,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:24:27,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:27,206 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand 18 states. [2020-12-21 21:24:27,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:27,275 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-12-21 21:24:27,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:24:27,280 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 71 [2020-12-21 21:24:27,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:27,280 INFO L225 Difference]: With dead ends: 120 [2020-12-21 21:24:27,281 INFO L226 Difference]: Without dead ends: 77 [2020-12-21 21:24:27,281 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:27,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-12-21 21:24:27,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2020-12-21 21:24:27,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-21 21:24:27,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2020-12-21 21:24:27,286 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 71 [2020-12-21 21:24:27,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:27,286 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2020-12-21 21:24:27,286 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:24:27,287 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2020-12-21 21:24:27,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-21 21:24:27,290 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:27,291 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:27,492 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:24:27,492 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:27,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:27,493 INFO L82 PathProgramCache]: Analyzing trace with hash -773288739, now seen corresponding path program 15 times [2020-12-21 21:24:27,494 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:27,494 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956535710] [2020-12-21 21:24:27,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:27,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:27,705 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-12-21 21:24:27,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956535710] [2020-12-21 21:24:27,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632363783] [2020-12-21 21:24:27,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:28,889 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-21 21:24:28,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:28,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:24:28,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:29,094 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2020-12-21 21:24:29,095 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:29,095 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11] total 27 [2020-12-21 21:24:29,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433642503] [2020-12-21 21:24:29,096 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-21 21:24:29,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:29,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-21 21:24:29,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=495, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:24:29,097 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand 27 states. [2020-12-21 21:24:29,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:29,302 INFO L93 Difference]: Finished difference Result 128 states and 136 transitions. [2020-12-21 21:24:29,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-21 21:24:29,302 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 73 [2020-12-21 21:24:29,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:29,303 INFO L225 Difference]: With dead ends: 128 [2020-12-21 21:24:29,303 INFO L226 Difference]: Without dead ends: 85 [2020-12-21 21:24:29,304 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=207, Invalid=495, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:24:29,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-12-21 21:24:29,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-12-21 21:24:29,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-12-21 21:24:29,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2020-12-21 21:24:29,309 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 73 [2020-12-21 21:24:29,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:29,309 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2020-12-21 21:24:29,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-21 21:24:29,309 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2020-12-21 21:24:29,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-12-21 21:24:29,310 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:29,310 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:29,524 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:24:29,525 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:29,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:29,526 INFO L82 PathProgramCache]: Analyzing trace with hash -859583145, now seen corresponding path program 16 times [2020-12-21 21:24:29,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:29,527 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587364572] [2020-12-21 21:24:29,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:29,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:29,775 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2020-12-21 21:24:29,776 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587364572] [2020-12-21 21:24:29,776 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887050698] [2020-12-21 21:24:29,776 INFO L93 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:29,855 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:29,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:29,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:24:29,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:30,102 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-12-21 21:24:30,103 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:30,103 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12] total 29 [2020-12-21 21:24:30,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385024437] [2020-12-21 21:24:30,104 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-21 21:24:30,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:30,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-21 21:24:30,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2020-12-21 21:24:30,105 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand 29 states. [2020-12-21 21:24:30,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:30,351 INFO L93 Difference]: Finished difference Result 138 states and 146 transitions. [2020-12-21 21:24:30,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-21 21:24:30,352 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 79 [2020-12-21 21:24:30,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:30,353 INFO L225 Difference]: With dead ends: 138 [2020-12-21 21:24:30,353 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 21:24:30,354 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2020-12-21 21:24:30,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 21:24:30,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-12-21 21:24:30,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-12-21 21:24:30,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2020-12-21 21:24:30,358 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 79 [2020-12-21 21:24:30,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:30,359 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2020-12-21 21:24:30,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-21 21:24:30,359 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2020-12-21 21:24:30,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-12-21 21:24:30,360 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:30,360 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:30,573 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 21:24:30,573 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:30,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:30,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1574111825, now seen corresponding path program 17 times [2020-12-21 21:24:30,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:30,575 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215522279] [2020-12-21 21:24:30,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:30,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:30,857 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2020-12-21 21:24:30,858 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215522279] [2020-12-21 21:24:30,858 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886404363] [2020-12-21 21:24:30,858 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:21,116 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2020-12-21 21:26:21,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:21,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 21:26:21,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:21,329 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2020-12-21 21:26:21,329 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:21,329 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-21 21:26:21,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904872578] [2020-12-21 21:26:21,330 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:26:21,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:21,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:26:21,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:26:21,331 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand 21 states. [2020-12-21 21:26:21,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:21,402 INFO L93 Difference]: Finished difference Result 142 states and 148 transitions. [2020-12-21 21:26:21,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:26:21,402 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 85 [2020-12-21 21:26:21,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:21,404 INFO L225 Difference]: With dead ends: 142 [2020-12-21 21:26:21,404 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 21:26:21,404 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:26:21,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 21:26:21,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2020-12-21 21:26:21,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-12-21 21:26:21,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 93 transitions. [2020-12-21 21:26:21,409 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 93 transitions. Word has length 85 [2020-12-21 21:26:21,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:21,409 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 93 transitions. [2020-12-21 21:26:21,409 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:26:21,409 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 93 transitions. [2020-12-21 21:26:21,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-12-21 21:26:21,410 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:21,410 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:21,625 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:21,626 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:21,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:21,627 INFO L82 PathProgramCache]: Analyzing trace with hash 84236943, now seen corresponding path program 18 times [2020-12-21 21:26:21,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:21,628 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740816412] [2020-12-21 21:26:21,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:21,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:21,974 INFO L134 CoverageAnalysis]: Checked inductivity of 524 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2020-12-21 21:26:21,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740816412] [2020-12-21 21:26:21,975 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933113795] [2020-12-21 21:26:21,975 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:37,391 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-12-21 21:26:37,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:37,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:26:37,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:37,729 INFO L134 CoverageAnalysis]: Checked inductivity of 524 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2020-12-21 21:26:37,729 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:37,730 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 13] total 32 [2020-12-21 21:26:37,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286334836] [2020-12-21 21:26:37,730 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-21 21:26:37,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:37,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-21 21:26:37,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=705, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:26:37,732 INFO L87 Difference]: Start difference. First operand 90 states and 93 transitions. Second operand 32 states. [2020-12-21 21:26:37,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:37,968 INFO L93 Difference]: Finished difference Result 150 states and 158 transitions. [2020-12-21 21:26:37,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-12-21 21:26:37,969 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 87 [2020-12-21 21:26:37,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:37,970 INFO L225 Difference]: With dead ends: 150 [2020-12-21 21:26:37,970 INFO L226 Difference]: Without dead ends: 99 [2020-12-21 21:26:37,971 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=287, Invalid=705, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:26:37,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-12-21 21:26:37,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2020-12-21 21:26:37,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-12-21 21:26:37,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 99 transitions. [2020-12-21 21:26:37,975 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 99 transitions. Word has length 87 [2020-12-21 21:26:37,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:37,976 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 99 transitions. [2020-12-21 21:26:37,976 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-21 21:26:37,976 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 99 transitions. [2020-12-21 21:26:37,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-12-21 21:26:37,977 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:37,977 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:38,192 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:38,193 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:38,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:38,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1717013897, now seen corresponding path program 19 times [2020-12-21 21:26:38,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:38,194 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150359052] [2020-12-21 21:26:38,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:38,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:38,523 INFO L134 CoverageAnalysis]: Checked inductivity of 603 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2020-12-21 21:26:38,523 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150359052] [2020-12-21 21:26:38,524 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520818446] [2020-12-21 21:26:38,524 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:38,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:38,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-21 21:26:38,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:38,746 INFO L134 CoverageAnalysis]: Checked inductivity of 603 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2020-12-21 21:26:38,747 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:38,747 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-21 21:26:38,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754096700] [2020-12-21 21:26:38,750 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-21 21:26:38,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:38,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-21 21:26:38,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:26:38,752 INFO L87 Difference]: Start difference. First operand 96 states and 99 transitions. Second operand 23 states. [2020-12-21 21:26:38,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:38,857 INFO L93 Difference]: Finished difference Result 154 states and 160 transitions. [2020-12-21 21:26:38,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-21 21:26:38,857 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 93 [2020-12-21 21:26:38,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:38,859 INFO L225 Difference]: With dead ends: 154 [2020-12-21 21:26:38,859 INFO L226 Difference]: Without dead ends: 99 [2020-12-21 21:26:38,860 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:26:38,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-12-21 21:26:38,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2020-12-21 21:26:38,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-12-21 21:26:38,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 101 transitions. [2020-12-21 21:26:38,864 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 101 transitions. Word has length 93 [2020-12-21 21:26:38,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:38,865 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 101 transitions. [2020-12-21 21:26:38,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-21 21:26:38,865 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 101 transitions. [2020-12-21 21:26:38,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-12-21 21:26:38,866 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:38,866 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:39,079 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-21 21:26:39,080 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:39,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:39,081 INFO L82 PathProgramCache]: Analyzing trace with hash 114081735, now seen corresponding path program 20 times [2020-12-21 21:26:39,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:39,082 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194914352] [2020-12-21 21:26:39,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:39,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:39,466 INFO L134 CoverageAnalysis]: Checked inductivity of 642 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2020-12-21 21:26:39,467 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194914352] [2020-12-21 21:26:39,467 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803201464] [2020-12-21 21:26:39,467 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:39,593 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:26:39,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:39,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-21 21:26:39,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:39,714 INFO L134 CoverageAnalysis]: Checked inductivity of 642 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2020-12-21 21:26:39,714 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:39,714 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-21 21:26:39,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637507344] [2020-12-21 21:26:39,715 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-21 21:26:39,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:39,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-21 21:26:39,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:26:39,717 INFO L87 Difference]: Start difference. First operand 98 states and 101 transitions. Second operand 24 states. [2020-12-21 21:26:39,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:39,823 INFO L93 Difference]: Finished difference Result 156 states and 162 transitions. [2020-12-21 21:26:39,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-21 21:26:39,823 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 95 [2020-12-21 21:26:39,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:39,824 INFO L225 Difference]: With dead ends: 156 [2020-12-21 21:26:39,825 INFO L226 Difference]: Without dead ends: 101 [2020-12-21 21:26:39,825 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:26:39,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-12-21 21:26:39,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2020-12-21 21:26:39,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-12-21 21:26:39,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 103 transitions. [2020-12-21 21:26:39,830 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 103 transitions. Word has length 95 [2020-12-21 21:26:39,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:39,830 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 103 transitions. [2020-12-21 21:26:39,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-21 21:26:39,830 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 103 transitions. [2020-12-21 21:26:39,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-12-21 21:26:39,832 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:39,832 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:40,045 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-21 21:26:40,045 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:40,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:40,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1589533317, now seen corresponding path program 21 times [2020-12-21 21:26:40,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:40,047 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231407044] [2020-12-21 21:26:40,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:40,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:40,439 INFO L134 CoverageAnalysis]: Checked inductivity of 683 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2020-12-21 21:26:40,440 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231407044] [2020-12-21 21:26:40,440 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44796633] [2020-12-21 21:26:40,440 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:44,989 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-21 21:26:44,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:45,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:26:45,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:45,365 INFO L134 CoverageAnalysis]: Checked inductivity of 683 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 562 trivial. 0 not checked. [2020-12-21 21:26:45,366 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:45,366 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 14] total 36 [2020-12-21 21:26:45,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466375159] [2020-12-21 21:26:45,367 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-12-21 21:26:45,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:45,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-12-21 21:26:45,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=894, Unknown=0, NotChecked=0, Total=1260 [2020-12-21 21:26:45,368 INFO L87 Difference]: Start difference. First operand 100 states and 103 transitions. Second operand 36 states. [2020-12-21 21:26:45,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:45,639 INFO L93 Difference]: Finished difference Result 164 states and 172 transitions. [2020-12-21 21:26:45,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-12-21 21:26:45,639 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 97 [2020-12-21 21:26:45,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:45,641 INFO L225 Difference]: With dead ends: 164 [2020-12-21 21:26:45,641 INFO L226 Difference]: Without dead ends: 109 [2020-12-21 21:26:45,642 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=366, Invalid=894, Unknown=0, NotChecked=0, Total=1260 [2020-12-21 21:26:45,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-12-21 21:26:45,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 106. [2020-12-21 21:26:45,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-12-21 21:26:45,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 109 transitions. [2020-12-21 21:26:45,648 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 109 transitions. Word has length 97 [2020-12-21 21:26:45,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:45,649 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 109 transitions. [2020-12-21 21:26:45,649 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-12-21 21:26:45,649 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 109 transitions. [2020-12-21 21:26:45,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-12-21 21:26:45,650 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:45,651 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:45,864 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:45,865 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:45,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:45,866 INFO L82 PathProgramCache]: Analyzing trace with hash 2087582975, now seen corresponding path program 22 times [2020-12-21 21:26:45,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:45,866 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205305707] [2020-12-21 21:26:45,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:45,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:46,328 INFO L134 CoverageAnalysis]: Checked inductivity of 772 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2020-12-21 21:26:46,329 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205305707] [2020-12-21 21:26:46,329 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363913549] [2020-12-21 21:26:46,329 INFO L93 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:46,419 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:26:46,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:46,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-21 21:26:46,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:46,533 INFO L134 CoverageAnalysis]: Checked inductivity of 772 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2020-12-21 21:26:46,533 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:46,533 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-21 21:26:46,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418613193] [2020-12-21 21:26:46,534 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-21 21:26:46,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:46,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-21 21:26:46,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-21 21:26:46,535 INFO L87 Difference]: Start difference. First operand 106 states and 109 transitions. Second operand 26 states. [2020-12-21 21:26:46,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:46,619 INFO L93 Difference]: Finished difference Result 168 states and 174 transitions. [2020-12-21 21:26:46,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-21 21:26:46,620 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 103 [2020-12-21 21:26:46,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:46,621 INFO L225 Difference]: With dead ends: 168 [2020-12-21 21:26:46,621 INFO L226 Difference]: Without dead ends: 109 [2020-12-21 21:26:46,622 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-21 21:26:46,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-12-21 21:26:46,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2020-12-21 21:26:46,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-12-21 21:26:46,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 111 transitions. [2020-12-21 21:26:46,626 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 111 transitions. Word has length 103 [2020-12-21 21:26:46,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:46,627 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 111 transitions. [2020-12-21 21:26:46,627 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-21 21:26:46,627 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 111 transitions. [2020-12-21 21:26:46,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-12-21 21:26:46,628 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:46,628 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:46,841 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-21 21:26:46,842 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:46,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:46,843 INFO L82 PathProgramCache]: Analyzing trace with hash -1997538883, now seen corresponding path program 23 times [2020-12-21 21:26:46,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:46,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195516582] [2020-12-21 21:26:46,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:46,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:47,273 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2020-12-21 21:26:47,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195516582] [2020-12-21 21:26:47,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129625310] [2020-12-21 21:26:47,274 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true