/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_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:38:42,267 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:38:42,271 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:38:42,320 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-21 21:38:42,408 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:38:42,409 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:38:42,410 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:38:42,413 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:38:42,457 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:38:42,457 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:38:42,458 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:38:42,459 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:38:42,459 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:38:42,459 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:38:42,459 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:38:42,459 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:38:42,460 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:38:42,460 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:38:42,460 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:38:42,460 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:38:42,460 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:38:42,461 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:38:42,461 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:38:42,461 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:38:42,461 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:38:42,461 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:38:42,462 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:38:42,462 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:38:42,462 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:38:42,462 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:38:42,462 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:38:42,462 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:38:42,463 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:38:42,463 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:38:42,815 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:38:42,842 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:38:42,845 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:38:42,847 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:38:42,848 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:38:42,848 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2020-12-21 21:38:42,934 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/74d64d71a/05798d2da883469b9849df2ae0689f7b/FLAGed846d8de [2020-12-21 21:38:43,593 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:38:43,594 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2020-12-21 21:38:43,601 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/74d64d71a/05798d2da883469b9849df2ae0689f7b/FLAGed846d8de [2020-12-21 21:38:43,617 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/74d64d71a/05798d2da883469b9849df2ae0689f7b [2020-12-21 21:38:43,620 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:38:43,622 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:38:43,624 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:38:43,624 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:38:43,628 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:38:43,629 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,630 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d96288a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43, skipping insertion in model container [2020-12-21 21:38:43,631 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,639 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:38:43,655 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:38:43,817 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_palindrome_ground.i[819,832] [2020-12-21 21:38:43,834 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:38:43,843 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:38:43,859 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_palindrome_ground.i[819,832] [2020-12-21 21:38:43,866 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:38:43,884 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:38:43,885 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43 WrapperNode [2020-12-21 21:38:43,885 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:38:43,887 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:38:43,887 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:38:43,887 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:38:43,897 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,905 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,930 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:38:43,931 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:38:43,932 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:38:43,932 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:38:43,943 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,943 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,945 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,946 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,951 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,956 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,957 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (1/1) ... [2020-12-21 21:38:43,960 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:38:43,961 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:38:43,961 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:38:43,961 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:38:43,962 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (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 21:38:44,068 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:38:44,068 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:38:44,069 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:38:44,069 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:38:44,069 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:38:44,069 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:38:44,069 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:38:44,389 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:38:44,389 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-21 21:38:44,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:38:44 BoogieIcfgContainer [2020-12-21 21:38:44,395 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:38:44,397 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:38:44,397 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:38:44,407 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:38:44,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:38:43" (1/3) ... [2020-12-21 21:38:44,412 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32c0b4b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:38:44, skipping insertion in model container [2020-12-21 21:38:44,412 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:38:43" (2/3) ... [2020-12-21 21:38:44,413 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32c0b4b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:38:44, skipping insertion in model container [2020-12-21 21:38:44,413 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:38:44" (3/3) ... [2020-12-21 21:38:44,417 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2020-12-21 21:38:44,433 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:38:44,445 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:38:44,492 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:38:44,526 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:38:44,526 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:38:44,552 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:38:44,553 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:38:44,553 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:38:44,553 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:38:44,553 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:38:44,553 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:38:44,577 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-12-21 21:38:44,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-21 21:38:44,583 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:44,583 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:44,584 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:44,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:44,590 INFO L82 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2020-12-21 21:38:44,615 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:44,616 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671971415] [2020-12-21 21:38:44,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:44,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:44,787 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 21:38:44,788 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671971415] [2020-12-21 21:38:44,789 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:38:44,789 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:38:44,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889620854] [2020-12-21 21:38:44,794 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:38:44,795 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:44,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:38:44,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:38:44,813 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2020-12-21 21:38:44,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:44,869 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2020-12-21 21:38:44,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:38:44,872 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-21 21:38:44,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:44,881 INFO L225 Difference]: With dead ends: 36 [2020-12-21 21:38:44,881 INFO L226 Difference]: Without dead ends: 18 [2020-12-21 21:38:44,885 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 21:38:44,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-21 21:38:44,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2020-12-21 21:38:44,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-21 21:38:44,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-21 21:38:44,921 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-12-21 21:38:44,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:44,922 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-21 21:38:44,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:38:44,922 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-21 21:38:44,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-21 21:38:44,923 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:44,923 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:44,923 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:38:44,924 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:44,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:44,925 INFO L82 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2020-12-21 21:38:44,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:44,926 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331321733] [2020-12-21 21:38:44,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:44,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:44,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:38:44,979 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331321733] [2020-12-21 21:38:44,980 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013851802] [2020-12-21 21:38:44,980 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 21:38:45,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:45,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:38:45,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:45,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:38:45,122 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:45,122 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:38:45,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630412441] [2020-12-21 21:38:45,124 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:38:45,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:45,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:38:45,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:38:45,126 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-12-21 21:38:45,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:45,161 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2020-12-21 21:38:45,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:38:45,162 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-12-21 21:38:45,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:45,163 INFO L225 Difference]: With dead ends: 33 [2020-12-21 21:38:45,163 INFO L226 Difference]: Without dead ends: 22 [2020-12-21 21:38:45,164 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 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 21:38:45,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-21 21:38:45,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2020-12-21 21:38:45,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-21 21:38:45,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-21 21:38:45,169 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 13 [2020-12-21 21:38:45,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:45,169 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-21 21:38:45,170 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:38:45,170 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-21 21:38:45,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:38:45,170 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:45,171 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:45,384 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:38:45,385 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:45,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:45,387 INFO L82 PathProgramCache]: Analyzing trace with hash -799235507, now seen corresponding path program 2 times [2020-12-21 21:38:45,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:45,388 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106925362] [2020-12-21 21:38:45,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:45,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:45,497 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-21 21:38:45,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106925362] [2020-12-21 21:38:45,498 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522444751] [2020-12-21 21:38:45,498 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 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 21:38:45,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:38:45,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:45,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:38:45,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:45,624 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-21 21:38:45,625 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:45,625 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:38:45,625 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229578848] [2020-12-21 21:38:45,626 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:38:45,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:45,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:38:45,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:38:45,628 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-12-21 21:38:45,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:45,669 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-12-21 21:38:45,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:38:45,669 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-12-21 21:38:45,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:45,670 INFO L225 Difference]: With dead ends: 39 [2020-12-21 21:38:45,671 INFO L226 Difference]: Without dead ends: 26 [2020-12-21 21:38:45,671 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:38:45,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-21 21:38:45,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-12-21 21:38:45,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:38:45,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-12-21 21:38:45,677 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-12-21 21:38:45,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:45,678 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-12-21 21:38:45,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:38:45,678 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-12-21 21:38:45,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:38:45,679 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:45,681 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:45,881 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:38:45,882 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:45,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:45,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1303246583, now seen corresponding path program 3 times [2020-12-21 21:38:45,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:45,886 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615256831] [2020-12-21 21:38:45,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:45,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:45,993 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-21 21:38:45,993 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615256831] [2020-12-21 21:38:45,994 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837207218] [2020-12-21 21:38:45,994 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 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 21:38:46,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-21 21:38:46,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:46,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:38:46,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:46,171 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-21 21:38:46,172 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:46,172 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:38:46,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401879966] [2020-12-21 21:38:46,173 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:38:46,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:46,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:38:46,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:38:46,175 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-12-21 21:38:46,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:46,233 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-12-21 21:38:46,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:38:46,233 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-12-21 21:38:46,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:46,234 INFO L225 Difference]: With dead ends: 45 [2020-12-21 21:38:46,235 INFO L226 Difference]: Without dead ends: 30 [2020-12-21 21:38:46,235 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:38:46,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-21 21:38:46,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2020-12-21 21:38:46,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 21:38:46,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-21 21:38:46,242 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2020-12-21 21:38:46,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:46,242 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-21 21:38:46,242 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:38:46,242 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-21 21:38:46,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 21:38:46,243 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:46,244 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:46,458 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:38:46,459 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:46,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:46,461 INFO L82 PathProgramCache]: Analyzing trace with hash -318070331, now seen corresponding path program 4 times [2020-12-21 21:38:46,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:46,461 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892880711] [2020-12-21 21:38:46,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:46,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:46,573 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:38:46,573 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892880711] [2020-12-21 21:38:46,574 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147444104] [2020-12-21 21:38:46,574 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 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 21:38:46,631 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:38:46,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:46,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:38:46,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:46,684 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:38:46,684 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:46,685 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:38:46,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341032440] [2020-12-21 21:38:46,685 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:38:46,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:46,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:38:46,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:38:46,687 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-12-21 21:38:46,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:46,736 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-12-21 21:38:46,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:38:46,737 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-12-21 21:38:46,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:46,738 INFO L225 Difference]: With dead ends: 51 [2020-12-21 21:38:46,738 INFO L226 Difference]: Without dead ends: 34 [2020-12-21 21:38:46,739 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 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 21:38:46,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-21 21:38:46,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-12-21 21:38:46,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-21 21:38:46,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-12-21 21:38:46,745 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 25 [2020-12-21 21:38:46,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:46,746 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-12-21 21:38:46,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:38:46,746 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-12-21 21:38:46,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-21 21:38:46,747 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:46,747 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:46,961 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:38:46,962 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:46,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:46,963 INFO L82 PathProgramCache]: Analyzing trace with hash 2015456385, now seen corresponding path program 5 times [2020-12-21 21:38:46,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:46,965 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611832495] [2020-12-21 21:38:46,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:46,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:47,069 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-21 21:38:47,069 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611832495] [2020-12-21 21:38:47,070 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837751616] [2020-12-21 21:38:47,070 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 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 21:38:47,185 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-21 21:38:47,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:47,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:38:47,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:47,241 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-21 21:38:47,242 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:47,242 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 21:38:47,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432038086] [2020-12-21 21:38:47,243 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:38:47,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:47,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:38:47,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:38:47,245 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 9 states. [2020-12-21 21:38:47,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:47,320 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2020-12-21 21:38:47,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 21:38:47,321 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2020-12-21 21:38:47,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:47,322 INFO L225 Difference]: With dead ends: 57 [2020-12-21 21:38:47,322 INFO L226 Difference]: Without dead ends: 38 [2020-12-21 21:38:47,325 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:38:47,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-21 21:38:47,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-12-21 21:38:47,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-21 21:38:47,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-21 21:38:47,342 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 29 [2020-12-21 21:38:47,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:47,343 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-21 21:38:47,343 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:38:47,343 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-21 21:38:47,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-21 21:38:47,345 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:47,345 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:47,560 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:38:47,561 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:47,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:47,562 INFO L82 PathProgramCache]: Analyzing trace with hash -189699779, now seen corresponding path program 6 times [2020-12-21 21:38:47,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:47,563 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305544044] [2020-12-21 21:38:47,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:47,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:47,646 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:38:47,647 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305544044] [2020-12-21 21:38:47,647 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970291847] [2020-12-21 21:38:47,647 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 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 21:38:47,775 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:38:47,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:47,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:38:47,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:47,847 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:38:47,847 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:47,848 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:38:47,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538723029] [2020-12-21 21:38:47,848 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:38:47,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:47,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:38:47,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:38:47,850 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 10 states. [2020-12-21 21:38:47,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:47,911 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2020-12-21 21:38:47,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:38:47,911 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 33 [2020-12-21 21:38:47,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:47,912 INFO L225 Difference]: With dead ends: 63 [2020-12-21 21:38:47,912 INFO L226 Difference]: Without dead ends: 42 [2020-12-21 21:38:47,913 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:38:47,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-21 21:38:47,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2020-12-21 21:38:47,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-21 21:38:47,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-12-21 21:38:47,918 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2020-12-21 21:38:47,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:47,919 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-12-21 21:38:47,919 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:38:47,919 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-12-21 21:38:47,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-21 21:38:47,920 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:47,920 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:48,133 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:38:48,134 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:48,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:48,136 INFO L82 PathProgramCache]: Analyzing trace with hash 760584185, now seen corresponding path program 7 times [2020-12-21 21:38:48,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:48,137 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195782700] [2020-12-21 21:38:48,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:48,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:48,261 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-21 21:38:48,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195782700] [2020-12-21 21:38:48,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030660720] [2020-12-21 21:38:48,263 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 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 21:38:48,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:48,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:38:48,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:48,375 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-21 21:38:48,375 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:48,376 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:38:48,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200484724] [2020-12-21 21:38:48,376 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:38:48,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:48,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:38:48,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:38:48,377 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 11 states. [2020-12-21 21:38:48,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:48,439 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2020-12-21 21:38:48,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:38:48,440 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2020-12-21 21:38:48,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:48,440 INFO L225 Difference]: With dead ends: 69 [2020-12-21 21:38:48,441 INFO L226 Difference]: Without dead ends: 46 [2020-12-21 21:38:48,441 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 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 21:38:48,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-21 21:38:48,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-12-21 21:38:48,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-21 21:38:48,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-12-21 21:38:48,447 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2020-12-21 21:38:48,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:48,447 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-12-21 21:38:48,447 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:38:48,447 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-12-21 21:38:48,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:38:48,448 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:48,448 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:48,662 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:38:48,663 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:48,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:48,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1775699787, now seen corresponding path program 8 times [2020-12-21 21:38:48,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:48,666 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168819110] [2020-12-21 21:38:48,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:48,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:48,819 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:38:48,820 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168819110] [2020-12-21 21:38:48,825 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102217762] [2020-12-21 21:38:48,825 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 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 21:38:48,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:38:48,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:48,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:38:48,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:48,959 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:38:48,960 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:48,960 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:38:48,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552966075] [2020-12-21 21:38:48,961 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:38:48,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:48,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:38:48,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:38:48,962 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 12 states. [2020-12-21 21:38:49,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:49,045 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2020-12-21 21:38:49,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:38:49,046 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-12-21 21:38:49,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:49,047 INFO L225 Difference]: With dead ends: 75 [2020-12-21 21:38:49,047 INFO L226 Difference]: Without dead ends: 50 [2020-12-21 21:38:49,048 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 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 21:38:49,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-21 21:38:49,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2020-12-21 21:38:49,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-21 21:38:49,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-12-21 21:38:49,054 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 41 [2020-12-21 21:38:49,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:49,054 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-12-21 21:38:49,054 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:38:49,054 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-12-21 21:38:49,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 21:38:49,055 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:49,055 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:49,270 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:38:49,271 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:49,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:49,272 INFO L82 PathProgramCache]: Analyzing trace with hash -859403407, now seen corresponding path program 9 times [2020-12-21 21:38:49,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:49,273 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378774406] [2020-12-21 21:38:49,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:49,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:49,444 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-21 21:38:49,444 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378774406] [2020-12-21 21:38:49,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561112321] [2020-12-21 21:38:49,445 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 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 21:38:49,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-21 21:38:49,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:49,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:38:49,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:49,935 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-21 21:38:49,935 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:49,936 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 21:38:49,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221175347] [2020-12-21 21:38:49,939 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:38:49,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:49,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:38:49,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:38:49,945 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 13 states. [2020-12-21 21:38:50,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:50,052 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2020-12-21 21:38:50,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:38:50,053 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 45 [2020-12-21 21:38:50,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:50,056 INFO L225 Difference]: With dead ends: 81 [2020-12-21 21:38:50,056 INFO L226 Difference]: Without dead ends: 54 [2020-12-21 21:38:50,057 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:38:50,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-21 21:38:50,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2020-12-21 21:38:50,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:38:50,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-12-21 21:38:50,070 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 45 [2020-12-21 21:38:50,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:50,072 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-12-21 21:38:50,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:38:50,072 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-12-21 21:38:50,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:38:50,074 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:50,074 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:50,289 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:38:50,290 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:50,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:50,291 INFO L82 PathProgramCache]: Analyzing trace with hash 407457837, now seen corresponding path program 10 times [2020-12-21 21:38:50,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:50,292 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928183244] [2020-12-21 21:38:50,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:50,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:50,421 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:38:50,422 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928183244] [2020-12-21 21:38:50,422 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271691725] [2020-12-21 21:38:50,422 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 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 21:38:50,488 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:38:50,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:50,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:38:50,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:50,572 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:38:50,572 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:50,572 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 21:38:50,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066807858] [2020-12-21 21:38:50,573 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:38:50,573 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:50,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:38:50,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:38:50,574 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 14 states. [2020-12-21 21:38:50,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:50,678 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2020-12-21 21:38:50,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:38:50,679 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2020-12-21 21:38:50,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:50,680 INFO L225 Difference]: With dead ends: 87 [2020-12-21 21:38:50,680 INFO L226 Difference]: Without dead ends: 58 [2020-12-21 21:38:50,680 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:38:50,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-21 21:38:50,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2020-12-21 21:38:50,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-21 21:38:50,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-12-21 21:38:50,686 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2020-12-21 21:38:50,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:50,686 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-12-21 21:38:50,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:38:50,686 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-12-21 21:38:50,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-21 21:38:50,687 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:50,687 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:50,900 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:38:50,901 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:50,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:50,903 INFO L82 PathProgramCache]: Analyzing trace with hash -380877079, now seen corresponding path program 11 times [2020-12-21 21:38:50,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:50,904 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009139575] [2020-12-21 21:38:50,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:50,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:51,041 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-21 21:38:51,042 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009139575] [2020-12-21 21:38:51,042 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206755411] [2020-12-21 21:38:51,042 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 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 21:38:52,767 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-21 21:38:52,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:52,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:38:52,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:52,854 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-21 21:38:52,855 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:52,855 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:38:52,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240569985] [2020-12-21 21:38:52,856 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:38:52,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:52,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:38:52,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:38:52,857 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 15 states. [2020-12-21 21:38:52,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:52,960 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2020-12-21 21:38:52,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:38:52,960 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2020-12-21 21:38:52,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:52,961 INFO L225 Difference]: With dead ends: 93 [2020-12-21 21:38:52,961 INFO L226 Difference]: Without dead ends: 62 [2020-12-21 21:38:52,962 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:38:52,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-12-21 21:38:52,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2020-12-21 21:38:52,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-21 21:38:52,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-12-21 21:38:52,967 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 53 [2020-12-21 21:38:52,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:52,967 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-12-21 21:38:52,967 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:38:52,967 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-12-21 21:38:52,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-21 21:38:52,968 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:52,968 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:53,181 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:38:53,182 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:53,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:53,183 INFO L82 PathProgramCache]: Analyzing trace with hash 1508536229, now seen corresponding path program 12 times [2020-12-21 21:38:53,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:53,184 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009524234] [2020-12-21 21:38:53,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:53,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:53,362 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-21 21:38:53,362 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009524234] [2020-12-21 21:38:53,362 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134082467] [2020-12-21 21:38:53,363 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 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 21:38:54,547 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 21:38:54,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:54,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 21:38:54,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:54,656 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-21 21:38:54,656 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:54,656 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-21 21:38:54,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749008501] [2020-12-21 21:38:54,657 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:38:54,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:54,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:38:54,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:38:54,659 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 16 states. [2020-12-21 21:38:54,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:54,788 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2020-12-21 21:38:54,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:38:54,788 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 57 [2020-12-21 21:38:54,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:54,789 INFO L225 Difference]: With dead ends: 99 [2020-12-21 21:38:54,789 INFO L226 Difference]: Without dead ends: 66 [2020-12-21 21:38:54,790 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:38:54,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-21 21:38:54,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2020-12-21 21:38:54,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-21 21:38:54,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-12-21 21:38:54,797 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 57 [2020-12-21 21:38:54,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:54,797 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-12-21 21:38:54,797 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:38:54,798 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-12-21 21:38:54,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:38:54,798 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:54,799 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:55,011 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:38:55,012 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:55,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:55,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1380005279, now seen corresponding path program 13 times [2020-12-21 21:38:55,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:55,014 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225085025] [2020-12-21 21:38:55,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:55,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:55,198 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-21 21:38:55,198 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225085025] [2020-12-21 21:38:55,199 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742479628] [2020-12-21 21:38:55,199 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 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 21:38:55,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:55,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:38:55,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:55,375 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-21 21:38:55,376 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:55,376 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:38:55,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38134377] [2020-12-21 21:38:55,377 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:38:55,378 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:55,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:38:55,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:38:55,379 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 17 states. [2020-12-21 21:38:55,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:55,511 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2020-12-21 21:38:55,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:38:55,512 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 61 [2020-12-21 21:38:55,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:55,513 INFO L225 Difference]: With dead ends: 105 [2020-12-21 21:38:55,513 INFO L226 Difference]: Without dead ends: 70 [2020-12-21 21:38:55,514 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 61 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 21:38:55,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-12-21 21:38:55,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2020-12-21 21:38:55,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-21 21:38:55,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-21 21:38:55,520 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 61 [2020-12-21 21:38:55,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:55,520 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-21 21:38:55,520 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:38:55,520 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-21 21:38:55,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-21 21:38:55,521 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:55,521 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:55,734 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:38:55,735 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:55,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:55,736 INFO L82 PathProgramCache]: Analyzing trace with hash -773564643, now seen corresponding path program 14 times [2020-12-21 21:38:55,736 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:55,737 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764946196] [2020-12-21 21:38:55,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:55,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:55,932 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:38:55,932 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764946196] [2020-12-21 21:38:55,933 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048650079] [2020-12-21 21:38:55,933 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 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 21:38:56,018 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:38:56,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:38:56,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:38:56,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:38:56,109 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:38:56,110 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:38:56,110 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:38:56,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393551844] [2020-12-21 21:38:56,111 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:38:56,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:38:56,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:38:56,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:38:56,113 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 18 states. [2020-12-21 21:38:56,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:38:56,242 INFO L93 Difference]: Finished difference Result 111 states and 116 transitions. [2020-12-21 21:38:56,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:38:56,243 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 65 [2020-12-21 21:38:56,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:38:56,245 INFO L225 Difference]: With dead ends: 111 [2020-12-21 21:38:56,245 INFO L226 Difference]: Without dead ends: 74 [2020-12-21 21:38:56,248 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 65 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 21:38:56,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-12-21 21:38:56,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2020-12-21 21:38:56,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-12-21 21:38:56,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-12-21 21:38:56,259 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 65 [2020-12-21 21:38:56,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:38:56,260 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-12-21 21:38:56,260 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:38:56,260 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-12-21 21:38:56,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-12-21 21:38:56,261 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:38:56,266 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:38:56,467 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:38:56,467 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:38:56,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:38:56,468 INFO L82 PathProgramCache]: Analyzing trace with hash -587852327, now seen corresponding path program 15 times [2020-12-21 21:38:56,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:38:56,469 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510020033] [2020-12-21 21:38:56,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:38:56,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:38:56,751 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-21 21:38:56,751 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510020033] [2020-12-21 21:38:56,753 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686441591] [2020-12-21 21:38:56,754 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 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 21:39:00,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2020-12-21 21:39:00,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:39:00,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 21:39:00,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:39:00,957 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-21 21:39:00,957 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:39:00,957 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 21:39:00,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742242464] [2020-12-21 21:39:00,958 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:39:00,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:39:00,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:39:00,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:39:00,959 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 19 states. [2020-12-21 21:39:01,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:39:01,095 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2020-12-21 21:39:01,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:39:01,095 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 69 [2020-12-21 21:39:01,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:39:01,096 INFO L225 Difference]: With dead ends: 117 [2020-12-21 21:39:01,096 INFO L226 Difference]: Without dead ends: 78 [2020-12-21 21:39:01,097 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:39:01,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-12-21 21:39:01,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-12-21 21:39:01,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-21 21:39:01,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-12-21 21:39:01,101 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 69 [2020-12-21 21:39:01,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:39:01,101 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-12-21 21:39:01,102 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:39:01,102 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-12-21 21:39:01,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-21 21:39:01,102 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:39:01,103 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:39:01,318 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:39:01,319 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:39:01,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:39:01,320 INFO L82 PathProgramCache]: Analyzing trace with hash -1894840683, now seen corresponding path program 16 times [2020-12-21 21:39:01,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:39:01,321 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972512578] [2020-12-21 21:39:01,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:39:01,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:39:01,551 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-21 21:39:01,551 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972512578] [2020-12-21 21:39:01,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324430074] [2020-12-21 21:39:01,552 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 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 21:39:01,641 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:39:01,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:39:01,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:39:01,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:39:01,746 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-21 21:39:01,747 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:39:01,747 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 21:39:01,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054843527] [2020-12-21 21:39:01,748 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:39:01,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:39:01,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:39:01,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:39:01,749 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 20 states. [2020-12-21 21:39:01,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:39:01,863 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2020-12-21 21:39:01,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:39:01,864 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 73 [2020-12-21 21:39:01,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:39:01,865 INFO L225 Difference]: With dead ends: 123 [2020-12-21 21:39:01,865 INFO L226 Difference]: Without dead ends: 82 [2020-12-21 21:39:01,866 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:39:01,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-12-21 21:39:01,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2020-12-21 21:39:01,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-12-21 21:39:01,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-12-21 21:39:01,870 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 73 [2020-12-21 21:39:01,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:39:01,870 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-12-21 21:39:01,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:39:01,870 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-12-21 21:39:01,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-12-21 21:39:01,871 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:39:01,871 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:39:02,085 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:39:02,086 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:39:02,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:39:02,087 INFO L82 PathProgramCache]: Analyzing trace with hash -775280303, now seen corresponding path program 17 times [2020-12-21 21:39:02,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:39:02,088 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885756779] [2020-12-21 21:39:02,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:39:02,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:39:02,326 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2020-12-21 21:39:02,327 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885756779] [2020-12-21 21:39:02,327 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357960903] [2020-12-21 21:39:02,327 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 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 21:39:14,221 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2020-12-21 21:39:14,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:39:14,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 21:39:14,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:39:14,360 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2020-12-21 21:39:14,360 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:39:14,360 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-21 21:39:14,360 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215323884] [2020-12-21 21:39:14,361 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:39:14,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:39:14,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:39:14,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:39:14,362 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 21 states. [2020-12-21 21:39:14,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:39:14,514 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2020-12-21 21:39:14,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:39:14,515 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 77 [2020-12-21 21:39:14,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:39:14,516 INFO L225 Difference]: With dead ends: 129 [2020-12-21 21:39:14,516 INFO L226 Difference]: Without dead ends: 86 [2020-12-21 21:39:14,516 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:39:14,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-12-21 21:39:14,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2020-12-21 21:39:14,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-12-21 21:39:14,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-12-21 21:39:14,520 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 77 [2020-12-21 21:39:14,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:39:14,520 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-12-21 21:39:14,520 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:39:14,520 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-12-21 21:39:14,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-12-21 21:39:14,521 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:39:14,521 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:39:14,735 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 21:39:14,736 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:39:14,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:39:14,737 INFO L82 PathProgramCache]: Analyzing trace with hash 943881741, now seen corresponding path program 18 times [2020-12-21 21:39:14,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:39:14,737 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501832888] [2020-12-21 21:39:14,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:39:14,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:39:15,000 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2020-12-21 21:39:15,001 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501832888] [2020-12-21 21:39:15,001 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855212019] [2020-12-21 21:39:15,001 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 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 21:39:33,836 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-12-21 21:39:33,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:39:33,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-21 21:39:33,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:39:33,987 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2020-12-21 21:39:33,987 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:39:33,987 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-21 21:39:33,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907645820] [2020-12-21 21:39:33,989 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-21 21:39:33,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:39:33,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-21 21:39:33,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 21:39:33,992 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 22 states. [2020-12-21 21:39:34,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:39:34,127 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2020-12-21 21:39:34,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 21:39:34,128 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 81 [2020-12-21 21:39:34,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:39:34,129 INFO L225 Difference]: With dead ends: 135 [2020-12-21 21:39:34,129 INFO L226 Difference]: Without dead ends: 90 [2020-12-21 21:39:34,130 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 21:39:34,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-12-21 21:39:34,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2020-12-21 21:39:34,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-12-21 21:39:34,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-12-21 21:39:34,133 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 81 [2020-12-21 21:39:34,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:39:34,133 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-12-21 21:39:34,133 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-21 21:39:34,133 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-12-21 21:39:34,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-12-21 21:39:34,134 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:39:34,134 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:39:34,347 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:39:34,348 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:39:34,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:39:34,349 INFO L82 PathProgramCache]: Analyzing trace with hash 2131952841, now seen corresponding path program 19 times [2020-12-21 21:39:34,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:39:34,349 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084867928] [2020-12-21 21:39:34,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:39:34,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:39:34,627 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2020-12-21 21:39:34,627 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084867928] [2020-12-21 21:39:34,627 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [480643201] [2020-12-21 21:39:34,627 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 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 21:39:34,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:39:34,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-21 21:39:34,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:39:34,839 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2020-12-21 21:39:34,840 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:39:34,840 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-21 21:39:34,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614541616] [2020-12-21 21:39:34,840 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-21 21:39:34,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:39:34,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-21 21:39:34,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:39:34,842 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 23 states. [2020-12-21 21:39:34,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:39:34,999 INFO L93 Difference]: Finished difference Result 141 states and 146 transitions. [2020-12-21 21:39:35,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-21 21:39:35,000 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-12-21 21:39:35,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:39:35,001 INFO L225 Difference]: With dead ends: 141 [2020-12-21 21:39:35,001 INFO L226 Difference]: Without dead ends: 94 [2020-12-21 21:39:35,001 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 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 21:39:35,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-12-21 21:39:35,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2020-12-21 21:39:35,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-12-21 21:39:35,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-12-21 21:39:35,005 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 85 [2020-12-21 21:39:35,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:39:35,005 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-12-21 21:39:35,005 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-21 21:39:35,005 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-12-21 21:39:35,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-12-21 21:39:35,006 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:39:35,006 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:39:35,220 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:39:35,221 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:39:35,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:39:35,222 INFO L82 PathProgramCache]: Analyzing trace with hash 207011205, now seen corresponding path program 20 times [2020-12-21 21:39:35,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:39:35,222 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496119103] [2020-12-21 21:39:35,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:39:35,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:39:35,524 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2020-12-21 21:39:35,525 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496119103] [2020-12-21 21:39:35,525 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79918105] [2020-12-21 21:39:35,525 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 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 21:39:35,642 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:39:35,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:39:35,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-21 21:39:35,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:39:35,817 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2020-12-21 21:39:35,818 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:39:35,818 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-21 21:39:35,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979344413] [2020-12-21 21:39:35,818 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-21 21:39:35,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:39:35,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-21 21:39:35,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:39:35,820 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 24 states. [2020-12-21 21:39:36,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:39:36,006 INFO L93 Difference]: Finished difference Result 147 states and 152 transitions. [2020-12-21 21:39:36,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-21 21:39:36,007 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 89 [2020-12-21 21:39:36,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:39:36,008 INFO L225 Difference]: With dead ends: 147 [2020-12-21 21:39:36,008 INFO L226 Difference]: Without dead ends: 98 [2020-12-21 21:39:36,009 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:39:36,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-12-21 21:39:36,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96. [2020-12-21 21:39:36,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-12-21 21:39:36,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 98 transitions. [2020-12-21 21:39:36,013 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 98 transitions. Word has length 89 [2020-12-21 21:39:36,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:39:36,013 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 98 transitions. [2020-12-21 21:39:36,013 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-21 21:39:36,013 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 98 transitions. [2020-12-21 21:39:36,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-12-21 21:39:36,014 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:39:36,014 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:39:36,227 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-21 21:39:36,227 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:39:36,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:39:36,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1873324097, now seen corresponding path program 21 times [2020-12-21 21:39:36,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:39:36,228 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812994352] [2020-12-21 21:39:36,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:39:36,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:39:36,624 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2020-12-21 21:39:36,624 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812994352] [2020-12-21 21:39:36,624 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679879335] [2020-12-21 21:39:36,624 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 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 21:40:08,567 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2020-12-21 21:40:08,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:40:08,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-21 21:40:08,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:40:08,713 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2020-12-21 21:40:08,714 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:40:08,714 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-21 21:40:08,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117608410] [2020-12-21 21:40:08,715 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-21 21:40:08,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:40:08,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-21 21:40:08,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:40:08,717 INFO L87 Difference]: Start difference. First operand 96 states and 98 transitions. Second operand 25 states. [2020-12-21 21:40:08,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:40:08,859 INFO L93 Difference]: Finished difference Result 153 states and 158 transitions. [2020-12-21 21:40:08,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-21 21:40:08,863 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 93 [2020-12-21 21:40:08,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:40:08,864 INFO L225 Difference]: With dead ends: 153 [2020-12-21 21:40:08,864 INFO L226 Difference]: Without dead ends: 102 [2020-12-21 21:40:08,865 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:40:08,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-12-21 21:40:08,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2020-12-21 21:40:08,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-12-21 21:40:08,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2020-12-21 21:40:08,869 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 93 [2020-12-21 21:40:08,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:40:08,869 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2020-12-21 21:40:08,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-21 21:40:08,870 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2020-12-21 21:40:08,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-12-21 21:40:08,870 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:40:08,871 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:40:09,084 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-21 21:40:09,085 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:40:09,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:40:09,086 INFO L82 PathProgramCache]: Analyzing trace with hash -500972291, now seen corresponding path program 22 times [2020-12-21 21:40:09,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:40:09,087 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128606775] [2020-12-21 21:40:09,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:40:09,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:40:09,480 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-12-21 21:40:09,480 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128606775] [2020-12-21 21:40:09,481 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236296268] [2020-12-21 21:40:09,481 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 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 21:40:09,565 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:40:09,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:40:09,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-21 21:40:09,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:40:09,678 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-12-21 21:40:09,679 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:40:09,679 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-21 21:40:09,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943977075] [2020-12-21 21:40:09,680 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-21 21:40:09,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:40:09,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-21 21:40:09,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-21 21:40:09,682 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand 26 states. [2020-12-21 21:40:09,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:40:09,825 INFO L93 Difference]: Finished difference Result 159 states and 164 transitions. [2020-12-21 21:40:09,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-21 21:40:09,826 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 97 [2020-12-21 21:40:09,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:40:09,827 INFO L225 Difference]: With dead ends: 159 [2020-12-21 21:40:09,827 INFO L226 Difference]: Without dead ends: 106 [2020-12-21 21:40:09,827 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 97 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 21:40:09,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-12-21 21:40:09,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2020-12-21 21:40:09,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-12-21 21:40:09,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2020-12-21 21:40:09,831 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 97 [2020-12-21 21:40:09,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:40:09,831 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2020-12-21 21:40:09,832 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-21 21:40:09,832 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2020-12-21 21:40:09,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-12-21 21:40:09,833 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:40:09,833 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:40:10,048 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:40:10,049 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:40:10,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:40:10,050 INFO L82 PathProgramCache]: Analyzing trace with hash -966585415, now seen corresponding path program 23 times [2020-12-21 21:40:10,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:40:10,050 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27609175] [2020-12-21 21:40:10,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:40:10,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:40:10,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-12-21 21:40:10,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27609175] [2020-12-21 21:40:10,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712116111] [2020-12-21 21:40:10,497 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 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 21:41:39,583 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2020-12-21 21:41:39,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:41:39,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 25 conjunts are in the unsatisfiable core [2020-12-21 21:41:39,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:41:39,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-12-21 21:41:39,799 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:41:39,799 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2020-12-21 21:41:39,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955654038] [2020-12-21 21:41:39,799 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-21 21:41:39,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:41:39,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-21 21:41:39,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:41:39,801 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 27 states. [2020-12-21 21:41:40,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:41:40,013 INFO L93 Difference]: Finished difference Result 165 states and 170 transitions. [2020-12-21 21:41:40,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-21 21:41:40,014 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 101 [2020-12-21 21:41:40,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:41:40,014 INFO L225 Difference]: With dead ends: 165 [2020-12-21 21:41:40,015 INFO L226 Difference]: Without dead ends: 110 [2020-12-21 21:41:40,015 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:41:40,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-12-21 21:41:40,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2020-12-21 21:41:40,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-12-21 21:41:40,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2020-12-21 21:41:40,019 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 101 [2020-12-21 21:41:40,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:41:40,019 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2020-12-21 21:41:40,019 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-21 21:41:40,019 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2020-12-21 21:41:40,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-12-21 21:41:40,020 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:41:40,020 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:41:40,235 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-21 21:41:40,236 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:41:40,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:41:40,237 INFO L82 PathProgramCache]: Analyzing trace with hash 679580789, now seen corresponding path program 24 times [2020-12-21 21:41:40,237 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:41:40,238 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345002954] [2020-12-21 21:41:40,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:41:40,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:41:40,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 576 trivial. 0 not checked. [2020-12-21 21:41:40,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345002954] [2020-12-21 21:41:40,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630944137] [2020-12-21 21:41:40,659 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 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