/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-industry-pattern/array_shadowinit.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:52:05,522 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:52:05,525 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:52:05,561 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-21 21:52:05,623 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:52:05,624 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:52:05,625 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:52:05,626 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:52:05,654 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:52:05,654 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:52:05,656 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:52:05,656 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:52:05,656 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:52:05,657 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:52:05,657 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:52:05,657 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:52:05,657 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:52:05,658 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:52:05,658 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:52:05,658 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:52:05,658 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:52:05,659 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:52:05,659 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:52:05,659 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:52:05,659 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:52:05,660 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:52:05,660 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:52:05,660 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:52:05,660 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:52:05,661 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:52:05,661 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:52:05,661 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:52:05,661 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:52:05,662 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:52:06,104 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:52:06,150 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:52:06,153 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:52:06,155 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:52:06,155 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:52:06,156 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2020-12-21 21:52:06,252 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dfb25aa40/b6db3a561a134646bc5ec9b00a9d1fd1/FLAG0bb30c65f [2020-12-21 21:52:06,836 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:52:06,836 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2020-12-21 21:52:06,843 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dfb25aa40/b6db3a561a134646bc5ec9b00a9d1fd1/FLAG0bb30c65f [2020-12-21 21:52:07,224 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dfb25aa40/b6db3a561a134646bc5ec9b00a9d1fd1 [2020-12-21 21:52:07,228 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:52:07,233 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:52:07,236 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:52:07,236 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:52:07,240 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:52:07,242 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,244 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66988cad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07, skipping insertion in model container [2020-12-21 21:52:07,244 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,256 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:52:07,276 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:52:07,481 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-industry-pattern/array_shadowinit.i[809,822] [2020-12-21 21:52:07,499 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:52:07,509 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:52:07,523 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-industry-pattern/array_shadowinit.i[809,822] [2020-12-21 21:52:07,529 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:52:07,544 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:52:07,545 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07 WrapperNode [2020-12-21 21:52:07,545 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:52:07,546 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:52:07,546 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:52:07,546 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:52:07,555 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,562 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,581 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:52:07,582 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:52:07,582 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:52:07,582 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:52:07,591 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,591 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,593 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,593 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,598 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,602 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,604 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (1/1) ... [2020-12-21 21:52:07,605 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:52:07,606 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:52:07,607 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:52:07,607 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:52:07,608 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (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 21:52:07,712 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:52:07,712 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:52:07,712 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:52:07,713 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:52:07,713 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:52:07,713 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:52:07,713 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:52:07,978 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:52:07,979 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-21 21:52:07,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:52:07 BoogieIcfgContainer [2020-12-21 21:52:07,982 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:52:07,989 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:52:07,989 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:52:07,998 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:52:07,999 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:52:07" (1/3) ... [2020-12-21 21:52:08,000 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55f2a8fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:52:07, skipping insertion in model container [2020-12-21 21:52:08,000 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:52:07" (2/3) ... [2020-12-21 21:52:08,003 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55f2a8fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:52:08, skipping insertion in model container [2020-12-21 21:52:08,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:52:07" (3/3) ... [2020-12-21 21:52:08,005 INFO L111 eAbstractionObserver]: Analyzing ICFG array_shadowinit.i [2020-12-21 21:52:08,020 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:52:08,028 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:52:08,055 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:52:08,096 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:52:08,096 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:52:08,096 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:52:08,097 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:52:08,097 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:52:08,097 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:52:08,097 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:52:08,097 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:52:08,111 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-12-21 21:52:08,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-21 21:52:08,115 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:08,116 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:08,116 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:08,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:08,123 INFO L82 PathProgramCache]: Analyzing trace with hash 126038137, now seen corresponding path program 1 times [2020-12-21 21:52:08,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:08,132 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625300543] [2020-12-21 21:52:08,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:08,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:08,383 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 21:52:08,384 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625300543] [2020-12-21 21:52:08,386 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:52:08,386 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-21 21:52:08,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376709914] [2020-12-21 21:52:08,392 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-21 21:52:08,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:08,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-21 21:52:08,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-21 21:52:08,417 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 2 states. [2020-12-21 21:52:08,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:08,437 INFO L93 Difference]: Finished difference Result 26 states and 33 transitions. [2020-12-21 21:52:08,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-21 21:52:08,439 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 8 [2020-12-21 21:52:08,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:08,451 INFO L225 Difference]: With dead ends: 26 [2020-12-21 21:52:08,451 INFO L226 Difference]: Without dead ends: 10 [2020-12-21 21:52:08,455 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-21 21:52:08,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-21 21:52:08,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-12-21 21:52:08,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-21 21:52:08,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2020-12-21 21:52:08,494 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 8 [2020-12-21 21:52:08,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:08,495 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2020-12-21 21:52:08,495 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-21 21:52:08,495 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2020-12-21 21:52:08,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-21 21:52:08,497 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:08,497 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:08,497 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:52:08,498 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:08,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:08,502 INFO L82 PathProgramCache]: Analyzing trace with hash 122344053, now seen corresponding path program 1 times [2020-12-21 21:52:08,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:08,502 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098920844] [2020-12-21 21:52:08,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:08,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:08,631 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 21:52:08,632 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098920844] [2020-12-21 21:52:08,632 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:52:08,632 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:52:08,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875843232] [2020-12-21 21:52:08,634 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:52:08,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:08,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:52:08,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:52:08,636 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 3 states. [2020-12-21 21:52:08,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:08,659 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2020-12-21 21:52:08,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:52:08,660 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2020-12-21 21:52:08,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:08,661 INFO L225 Difference]: With dead ends: 17 [2020-12-21 21:52:08,661 INFO L226 Difference]: Without dead ends: 11 [2020-12-21 21:52:08,662 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 21:52:08,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-12-21 21:52:08,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-12-21 21:52:08,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-21 21:52:08,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-12-21 21:52:08,666 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2020-12-21 21:52:08,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:08,666 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-12-21 21:52:08,666 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:52:08,667 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-12-21 21:52:08,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-21 21:52:08,667 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:08,667 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:08,668 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-21 21:52:08,668 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:08,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:08,669 INFO L82 PathProgramCache]: Analyzing trace with hash -450855509, now seen corresponding path program 1 times [2020-12-21 21:52:08,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:08,669 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973873910] [2020-12-21 21:52:08,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:08,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:08,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:08,883 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973873910] [2020-12-21 21:52:08,884 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977522026] [2020-12-21 21:52:08,884 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 21:52:08,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:08,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:52:08,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:09,051 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-12-21 21:52:09,056 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:09,065 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:09,070 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:09,071 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-12-21 21:52:09,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:09,141 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:09,141 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:52:09,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975153427] [2020-12-21 21:52:09,142 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:52:09,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:09,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:52:09,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:52:09,145 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 7 states. [2020-12-21 21:52:09,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:09,245 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2020-12-21 21:52:09,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 21:52:09,245 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2020-12-21 21:52:09,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:09,247 INFO L225 Difference]: With dead ends: 17 [2020-12-21 21:52:09,247 INFO L226 Difference]: Without dead ends: 15 [2020-12-21 21:52:09,250 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:52:09,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-12-21 21:52:09,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 13. [2020-12-21 21:52:09,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-21 21:52:09,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-12-21 21:52:09,260 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2020-12-21 21:52:09,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:09,260 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-12-21 21:52:09,260 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:52:09,261 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-12-21 21:52:09,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-21 21:52:09,261 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:09,262 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:09,476 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-21 21:52:09,477 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:09,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:09,479 INFO L82 PathProgramCache]: Analyzing trace with hash -1068940558, now seen corresponding path program 1 times [2020-12-21 21:52:09,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:09,480 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189407476] [2020-12-21 21:52:09,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:09,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:09,548 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:09,548 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189407476] [2020-12-21 21:52:09,549 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453265211] [2020-12-21 21:52:09,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:09,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:09,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:52:09,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:09,680 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:09,680 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:09,681 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-12-21 21:52:09,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845466941] [2020-12-21 21:52:09,681 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:52:09,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:09,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:52:09,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:52:09,683 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 10 states. [2020-12-21 21:52:09,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:09,752 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-12-21 21:52:09,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:52:09,753 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2020-12-21 21:52:09,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:09,753 INFO L225 Difference]: With dead ends: 30 [2020-12-21 21:52:09,754 INFO L226 Difference]: Without dead ends: 20 [2020-12-21 21:52:09,755 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:52:09,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-21 21:52:09,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 14. [2020-12-21 21:52:09,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-21 21:52:09,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-12-21 21:52:09,759 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2020-12-21 21:52:09,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:09,759 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-12-21 21:52:09,760 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:52:09,760 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-12-21 21:52:09,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-21 21:52:09,760 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:09,761 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:09,974 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:09,975 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:09,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:09,977 INFO L82 PathProgramCache]: Analyzing trace with hash 407528232, now seen corresponding path program 2 times [2020-12-21 21:52:09,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:09,978 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194524885] [2020-12-21 21:52:09,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:10,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:10,101 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:10,102 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194524885] [2020-12-21 21:52:10,102 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802703370] [2020-12-21 21:52:10,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:10,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:52:10,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:10,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 25 conjunts are in the unsatisfiable core [2020-12-21 21:52:10,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:10,230 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-12-21 21:52:10,231 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:10,236 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:10,237 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:10,237 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:13 [2020-12-21 21:52:10,373 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-21 21:52:10,379 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-21 21:52:10,383 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-21 21:52:10,401 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:10,401 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:10,401 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 16 [2020-12-21 21:52:10,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215608476] [2020-12-21 21:52:10,402 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:52:10,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:10,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:52:10,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:52:10,404 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 16 states. [2020-12-21 21:52:10,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:10,707 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-12-21 21:52:10,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:52:10,708 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 13 [2020-12-21 21:52:10,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:10,708 INFO L225 Difference]: With dead ends: 30 [2020-12-21 21:52:10,709 INFO L226 Difference]: Without dead ends: 20 [2020-12-21 21:52:10,710 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=145, Invalid=557, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:52:10,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-21 21:52:10,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2020-12-21 21:52:10,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-21 21:52:10,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-12-21 21:52:10,714 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-12-21 21:52:10,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:10,715 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-12-21 21:52:10,715 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:52:10,715 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-12-21 21:52:10,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:52:10,716 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:10,716 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:10,931 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:10,932 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:10,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:10,933 INFO L82 PathProgramCache]: Analyzing trace with hash -298048117, now seen corresponding path program 3 times [2020-12-21 21:52:10,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:10,933 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359489863] [2020-12-21 21:52:10,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:10,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:11,163 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:11,164 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359489863] [2020-12-21 21:52:11,164 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90473861] [2020-12-21 21:52:11,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:11,215 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:52:11,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:11,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 29 conjunts are in the unsatisfiable core [2020-12-21 21:52:11,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:11,291 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-12-21 21:52:11,292 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:11,302 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:11,303 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:11,303 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:13 [2020-12-21 21:52:11,496 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-21 21:52:11,500 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-21 21:52:11,503 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-21 21:52:11,526 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:11,527 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:11,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2020-12-21 21:52:11,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998436766] [2020-12-21 21:52:11,528 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:52:11,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:11,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:52:11,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:52:11,529 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 20 states. [2020-12-21 21:52:12,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:12,069 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2020-12-21 21:52:12,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-21 21:52:12,070 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 17 [2020-12-21 21:52:12,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:12,071 INFO L225 Difference]: With dead ends: 41 [2020-12-21 21:52:12,071 INFO L226 Difference]: Without dead ends: 28 [2020-12-21 21:52:12,072 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=216, Invalid=974, Unknown=0, NotChecked=0, Total=1190 [2020-12-21 21:52:12,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-21 21:52:12,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2020-12-21 21:52:12,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-21 21:52:12,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2020-12-21 21:52:12,077 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2020-12-21 21:52:12,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:12,078 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2020-12-21 21:52:12,078 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:52:12,078 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2020-12-21 21:52:12,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:52:12,078 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:12,079 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:12,292 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:12,293 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:12,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:12,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1156487496, now seen corresponding path program 4 times [2020-12-21 21:52:12,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:12,295 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726555465] [2020-12-21 21:52:12,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:12,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:12,451 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:12,451 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726555465] [2020-12-21 21:52:12,451 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68642430] [2020-12-21 21:52:12,452 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:12,503 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:52:12,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:12,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 30 conjunts are in the unsatisfiable core [2020-12-21 21:52:12,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:12,538 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2020-12-21 21:52:12,539 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:12,545 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:12,547 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:52:12,547 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2020-12-21 21:52:12,728 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:12,729 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:12,729 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-12-21 21:52:12,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159667678] [2020-12-21 21:52:12,730 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:52:12,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:12,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:52:12,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:52:12,732 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 17 states. [2020-12-21 21:52:13,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:13,081 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2020-12-21 21:52:13,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:52:13,082 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2020-12-21 21:52:13,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:13,082 INFO L225 Difference]: With dead ends: 29 [2020-12-21 21:52:13,083 INFO L226 Difference]: Without dead ends: 27 [2020-12-21 21:52:13,083 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:52:13,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-21 21:52:13,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2020-12-21 21:52:13,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-21 21:52:13,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-12-21 21:52:13,089 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 21 [2020-12-21 21:52:13,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:13,089 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-12-21 21:52:13,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:52:13,089 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-12-21 21:52:13,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-21 21:52:13,090 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:13,090 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:13,304 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-21 21:52:13,305 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:13,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:13,306 INFO L82 PathProgramCache]: Analyzing trace with hash -1303861707, now seen corresponding path program 5 times [2020-12-21 21:52:13,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:13,307 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838081596] [2020-12-21 21:52:13,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:13,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:13,434 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:13,434 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838081596] [2020-12-21 21:52:13,434 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517600307] [2020-12-21 21:52:13,435 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:13,497 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-12-21 21:52:13,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:13,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:52:13,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:13,677 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:13,677 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:13,677 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 19 [2020-12-21 21:52:13,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960667418] [2020-12-21 21:52:13,679 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:52:13,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:13,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:52:13,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=253, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:52:13,680 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 19 states. [2020-12-21 21:52:13,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:13,831 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-12-21 21:52:13,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:52:13,831 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 24 [2020-12-21 21:52:13,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:13,832 INFO L225 Difference]: With dead ends: 51 [2020-12-21 21:52:13,833 INFO L226 Difference]: Without dead ends: 32 [2020-12-21 21:52:13,834 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=144, Invalid=408, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:52:13,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-21 21:52:13,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2020-12-21 21:52:13,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-21 21:52:13,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-12-21 21:52:13,840 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 24 [2020-12-21 21:52:13,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:13,840 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-12-21 21:52:13,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:52:13,840 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-12-21 21:52:13,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 21:52:13,841 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:13,841 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:14,054 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:14,055 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:14,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:14,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1052957333, now seen corresponding path program 6 times [2020-12-21 21:52:14,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:14,057 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603416942] [2020-12-21 21:52:14,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:14,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:14,299 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:14,299 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603416942] [2020-12-21 21:52:14,299 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123346887] [2020-12-21 21:52:14,299 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:14,372 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2020-12-21 21:52:14,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:14,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 34 conjunts are in the unsatisfiable core [2020-12-21 21:52:14,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:14,506 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-12-21 21:52:14,506 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:14,509 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:14,509 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:14,515 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:9 [2020-12-21 21:52:14,791 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:14,791 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:14,791 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 27 [2020-12-21 21:52:14,792 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678191008] [2020-12-21 21:52:14,792 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-21 21:52:14,792 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:14,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-21 21:52:14,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=634, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:52:14,794 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 27 states. [2020-12-21 21:52:15,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:15,563 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2020-12-21 21:52:15,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:52:15,563 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 25 [2020-12-21 21:52:15,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:15,567 INFO L225 Difference]: With dead ends: 33 [2020-12-21 21:52:15,567 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 21:52:15,568 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2020-12-21 21:52:15,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 21:52:15,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-12-21 21:52:15,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-21 21:52:15,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-12-21 21:52:15,580 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 25 [2020-12-21 21:52:15,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:15,582 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-12-21 21:52:15,582 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-21 21:52:15,582 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-12-21 21:52:15,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-21 21:52:15,583 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:15,583 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:15,796 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:15,797 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:15,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:15,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1794016050, now seen corresponding path program 7 times [2020-12-21 21:52:15,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:15,799 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653022041] [2020-12-21 21:52:15,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:15,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:15,980 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:15,981 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653022041] [2020-12-21 21:52:15,981 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025179874] [2020-12-21 21:52:15,981 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:16,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:16,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 21:52:16,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:16,229 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:16,229 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:16,229 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 22 [2020-12-21 21:52:16,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529994048] [2020-12-21 21:52:16,230 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-21 21:52:16,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:16,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-21 21:52:16,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2020-12-21 21:52:16,232 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 22 states. [2020-12-21 21:52:16,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:16,403 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-12-21 21:52:16,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:52:16,403 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 28 [2020-12-21 21:52:16,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:16,404 INFO L225 Difference]: With dead ends: 58 [2020-12-21 21:52:16,404 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 21:52:16,405 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=564, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:52:16,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 21:52:16,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-12-21 21:52:16,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-21 21:52:16,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-12-21 21:52:16,411 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 28 [2020-12-21 21:52:16,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:16,411 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-12-21 21:52:16,412 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-21 21:52:16,412 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-12-21 21:52:16,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-21 21:52:16,413 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:16,413 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:16,626 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-21 21:52:16,627 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:16,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:16,628 INFO L82 PathProgramCache]: Analyzing trace with hash -528189592, now seen corresponding path program 8 times [2020-12-21 21:52:16,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:16,629 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677669584] [2020-12-21 21:52:16,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:16,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:16,879 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:16,879 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677669584] [2020-12-21 21:52:16,879 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2135564781] [2020-12-21 21:52:16,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:16,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:52:16,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:16,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 41 conjunts are in the unsatisfiable core [2020-12-21 21:52:16,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:17,102 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-12-21 21:52:17,102 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:17,107 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:17,107 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:17,108 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:13 [2020-12-21 21:52:17,533 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-21 21:52:17,544 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-21 21:52:17,548 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-21 21:52:17,582 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 31 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:17,583 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:17,583 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18] total 32 [2020-12-21 21:52:17,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886635102] [2020-12-21 21:52:17,584 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-21 21:52:17,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:17,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-21 21:52:17,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=890, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:52:17,585 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 32 states. [2020-12-21 21:52:19,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:19,211 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2020-12-21 21:52:19,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-12-21 21:52:19,212 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 29 [2020-12-21 21:52:19,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:19,213 INFO L225 Difference]: With dead ends: 58 [2020-12-21 21:52:19,213 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 21:52:19,215 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 884 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=450, Invalid=3456, Unknown=0, NotChecked=0, Total=3906 [2020-12-21 21:52:19,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 21:52:19,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-12-21 21:52:19,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-21 21:52:19,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-12-21 21:52:19,222 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2020-12-21 21:52:19,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:19,223 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-12-21 21:52:19,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-21 21:52:19,223 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-12-21 21:52:19,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-21 21:52:19,224 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:19,224 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:19,438 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:19,439 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:19,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:19,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1812036939, now seen corresponding path program 9 times [2020-12-21 21:52:19,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:19,443 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866939745] [2020-12-21 21:52:19,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:19,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:19,811 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:19,811 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866939745] [2020-12-21 21:52:19,811 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021877172] [2020-12-21 21:52:19,811 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:19,969 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2020-12-21 21:52:19,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:19,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 49 conjunts are in the unsatisfiable core [2020-12-21 21:52:19,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:19,987 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2020-12-21 21:52:19,987 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:19,994 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:19,995 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:19,995 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2020-12-21 21:52:20,045 INFO L348 Elim1Store]: treesize reduction 44, result has 21.4 percent of original size [2020-12-21 21:52:20,045 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2020-12-21 21:52:20,047 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:20,056 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:20,056 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:20,057 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:39, output treesize:35 [2020-12-21 21:52:20,123 INFO L348 Elim1Store]: treesize reduction 104, result has 19.4 percent of original size [2020-12-21 21:52:20,124 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 49 [2020-12-21 21:52:20,128 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:20,139 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:20,140 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:20,140 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:53, output treesize:49 [2020-12-21 21:52:20,243 INFO L348 Elim1Store]: treesize reduction 183, result has 16.8 percent of original size [2020-12-21 21:52:20,244 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 66 [2020-12-21 21:52:20,247 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:20,262 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:20,263 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:20,263 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:67, output treesize:63 [2020-12-21 21:52:20,387 INFO L348 Elim1Store]: treesize reduction 280, result has 14.9 percent of original size [2020-12-21 21:52:20,388 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 75 treesize of output 83 [2020-12-21 21:52:20,391 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:20,408 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:20,409 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:20,410 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:81, output treesize:77 [2020-12-21 21:52:20,587 INFO L348 Elim1Store]: treesize reduction 375, result has 14.0 percent of original size [2020-12-21 21:52:20,588 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 86 treesize of output 97 [2020-12-21 21:52:20,591 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:20,614 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:20,617 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:52:20,617 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:92, output treesize:88 [2020-12-21 21:52:21,497 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 7 disjuncts [2020-12-21 21:52:21,502 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 9 disjuncts [2020-12-21 21:52:21,570 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:21,570 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:21,571 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19] total 33 [2020-12-21 21:52:21,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332844537] [2020-12-21 21:52:21,571 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-12-21 21:52:21,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:21,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-12-21 21:52:21,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=933, Unknown=0, NotChecked=0, Total=1056 [2020-12-21 21:52:21,573 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 33 states. [2020-12-21 21:52:22,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:22,503 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2020-12-21 21:52:22,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 21:52:22,503 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 33 [2020-12-21 21:52:22,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:22,504 INFO L225 Difference]: With dead ends: 41 [2020-12-21 21:52:22,504 INFO L226 Difference]: Without dead ends: 39 [2020-12-21 21:52:22,505 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=224, Invalid=1498, Unknown=0, NotChecked=0, Total=1722 [2020-12-21 21:52:22,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-21 21:52:22,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-12-21 21:52:22,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-21 21:52:22,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-12-21 21:52:22,518 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 33 [2020-12-21 21:52:22,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:22,521 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-12-21 21:52:22,521 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-12-21 21:52:22,521 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-12-21 21:52:22,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-21 21:52:22,523 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:22,523 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:22,723 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:22,724 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:22,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:22,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1046700206, now seen corresponding path program 10 times [2020-12-21 21:52:22,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:22,727 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719594254] [2020-12-21 21:52:22,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:22,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:22,971 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:22,971 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719594254] [2020-12-21 21:52:22,971 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481912791] [2020-12-21 21:52:22,972 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:23,031 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:52:23,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:23,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:52:23,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:23,318 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:23,318 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:23,318 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 28 [2020-12-21 21:52:23,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953036532] [2020-12-21 21:52:23,319 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-21 21:52:23,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:23,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-21 21:52:23,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=571, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:52:23,320 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 28 states. [2020-12-21 21:52:23,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:23,576 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2020-12-21 21:52:23,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 21:52:23,576 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 36 [2020-12-21 21:52:23,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:23,577 INFO L225 Difference]: With dead ends: 72 [2020-12-21 21:52:23,578 INFO L226 Difference]: Without dead ends: 44 [2020-12-21 21:52:23,579 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=309, Invalid=951, Unknown=0, NotChecked=0, Total=1260 [2020-12-21 21:52:23,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-21 21:52:23,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 38. [2020-12-21 21:52:23,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-21 21:52:23,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-12-21 21:52:23,585 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 36 [2020-12-21 21:52:23,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:23,586 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-12-21 21:52:23,586 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-21 21:52:23,586 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-12-21 21:52:23,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-21 21:52:23,587 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:23,587 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:23,792 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:52:23,793 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:23,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:23,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1382940040, now seen corresponding path program 11 times [2020-12-21 21:52:23,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:23,795 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069515140] [2020-12-21 21:52:23,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:23,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:24,215 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:24,216 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069515140] [2020-12-21 21:52:24,216 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644121049] [2020-12-21 21:52:24,216 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:24,323 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2020-12-21 21:52:24,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:24,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 38 conjunts are in the unsatisfiable core [2020-12-21 21:52:24,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:24,351 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2020-12-21 21:52:24,352 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:24,357 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:24,358 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:52:24,358 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2020-12-21 21:52:24,756 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:24,756 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:24,756 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 28 [2020-12-21 21:52:24,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559028534] [2020-12-21 21:52:24,757 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-21 21:52:24,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:24,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-21 21:52:24,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=687, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:52:24,758 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 28 states. [2020-12-21 21:52:25,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:25,415 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2020-12-21 21:52:25,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-21 21:52:25,416 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 37 [2020-12-21 21:52:25,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:25,417 INFO L225 Difference]: With dead ends: 45 [2020-12-21 21:52:25,417 INFO L226 Difference]: Without dead ends: 43 [2020-12-21 21:52:25,418 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=144, Invalid=1338, Unknown=0, NotChecked=0, Total=1482 [2020-12-21 21:52:25,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-21 21:52:25,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-12-21 21:52:25,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-21 21:52:25,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-12-21 21:52:25,426 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 37 [2020-12-21 21:52:25,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:25,426 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-12-21 21:52:25,427 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-21 21:52:25,427 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-12-21 21:52:25,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-21 21:52:25,427 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:25,427 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:25,641 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:52:25,642 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:25,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:25,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1845221877, now seen corresponding path program 12 times [2020-12-21 21:52:25,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:25,644 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057951974] [2020-12-21 21:52:25,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:25,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:25,909 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:25,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057951974] [2020-12-21 21:52:25,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259574369] [2020-12-21 21:52:25,910 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:26,043 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2020-12-21 21:52:26,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:26,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-21 21:52:26,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:26,397 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:26,397 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:26,397 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 31 [2020-12-21 21:52:26,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491606693] [2020-12-21 21:52:26,398 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-12-21 21:52:26,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:26,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-12-21 21:52:26,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=705, Unknown=0, NotChecked=0, Total=930 [2020-12-21 21:52:26,399 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 31 states. [2020-12-21 21:52:26,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:26,704 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2020-12-21 21:52:26,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-21 21:52:26,707 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 40 [2020-12-21 21:52:26,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:26,708 INFO L225 Difference]: With dead ends: 79 [2020-12-21 21:52:26,708 INFO L226 Difference]: Without dead ends: 48 [2020-12-21 21:52:26,709 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=378, Invalid=1182, Unknown=0, NotChecked=0, Total=1560 [2020-12-21 21:52:26,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-21 21:52:26,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2020-12-21 21:52:26,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-21 21:52:26,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-12-21 21:52:26,717 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 40 [2020-12-21 21:52:26,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:26,717 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-12-21 21:52:26,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-12-21 21:52:26,717 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-12-21 21:52:26,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:52:26,718 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:26,718 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:26,925 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-21 21:52:26,926 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:26,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:26,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1575431467, now seen corresponding path program 13 times [2020-12-21 21:52:26,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:26,928 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490658529] [2020-12-21 21:52:26,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:26,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:27,491 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:27,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490658529] [2020-12-21 21:52:27,492 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216311007] [2020-12-21 21:52:27,492 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:27,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:27,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 50 conjunts are in the unsatisfiable core [2020-12-21 21:52:27,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:27,883 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-12-21 21:52:27,884 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:27,886 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:27,886 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:27,886 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:9 [2020-12-21 21:52:28,553 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:28,553 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:28,553 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23] total 43 [2020-12-21 21:52:28,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929416373] [2020-12-21 21:52:28,554 INFO L461 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-12-21 21:52:28,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:28,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-12-21 21:52:28,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1698, Unknown=0, NotChecked=0, Total=1806 [2020-12-21 21:52:28,555 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 43 states. [2020-12-21 21:52:30,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:30,412 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-12-21 21:52:30,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-21 21:52:30,413 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 41 [2020-12-21 21:52:30,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:30,413 INFO L225 Difference]: With dead ends: 49 [2020-12-21 21:52:30,413 INFO L226 Difference]: Without dead ends: 47 [2020-12-21 21:52:30,415 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=275, Invalid=3757, Unknown=0, NotChecked=0, Total=4032 [2020-12-21 21:52:30,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-12-21 21:52:30,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2020-12-21 21:52:30,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-21 21:52:30,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-12-21 21:52:30,423 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 41 [2020-12-21 21:52:30,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:30,424 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-12-21 21:52:30,424 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-12-21 21:52:30,424 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-12-21 21:52:30,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-21 21:52:30,424 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:30,425 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:30,629 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:30,630 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:30,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:30,631 INFO L82 PathProgramCache]: Analyzing trace with hash -1718983822, now seen corresponding path program 14 times [2020-12-21 21:52:30,631 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:30,631 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953943800] [2020-12-21 21:52:30,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:30,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:30,938 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:30,939 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953943800] [2020-12-21 21:52:30,939 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677522716] [2020-12-21 21:52:30,939 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:31,002 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:52:31,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:31,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-21 21:52:31,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:31,397 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:31,398 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:31,398 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 34 [2020-12-21 21:52:31,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722034385] [2020-12-21 21:52:31,398 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-12-21 21:52:31,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:31,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-12-21 21:52:31,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=853, Unknown=0, NotChecked=0, Total=1122 [2020-12-21 21:52:31,400 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 34 states. [2020-12-21 21:52:31,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:31,735 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2020-12-21 21:52:31,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-21 21:52:31,735 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 44 [2020-12-21 21:52:31,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:31,736 INFO L225 Difference]: With dead ends: 86 [2020-12-21 21:52:31,736 INFO L226 Difference]: Without dead ends: 52 [2020-12-21 21:52:31,737 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=454, Invalid=1438, Unknown=0, NotChecked=0, Total=1892 [2020-12-21 21:52:31,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-21 21:52:31,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2020-12-21 21:52:31,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-12-21 21:52:31,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2020-12-21 21:52:31,746 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2020-12-21 21:52:31,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:31,746 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2020-12-21 21:52:31,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-12-21 21:52:31,746 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2020-12-21 21:52:31,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 21:52:31,747 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:31,747 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:31,962 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:52:31,963 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:31,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:31,964 INFO L82 PathProgramCache]: Analyzing trace with hash 814558120, now seen corresponding path program 15 times [2020-12-21 21:52:31,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:31,965 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630949861] [2020-12-21 21:52:31,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:31,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:32,470 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:32,471 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630949861] [2020-12-21 21:52:32,471 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579184057] [2020-12-21 21:52:32,471 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:32,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-21 21:52:32,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:32,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 63 conjunts are in the unsatisfiable core [2020-12-21 21:52:32,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:32,793 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2020-12-21 21:52:32,796 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:32,802 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:32,803 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:32,803 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2020-12-21 21:52:32,873 INFO L348 Elim1Store]: treesize reduction 44, result has 21.4 percent of original size [2020-12-21 21:52:32,874 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2020-12-21 21:52:32,876 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:32,885 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:32,886 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:32,886 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:39, output treesize:35 [2020-12-21 21:52:32,979 INFO L348 Elim1Store]: treesize reduction 104, result has 19.4 percent of original size [2020-12-21 21:52:32,980 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 49 [2020-12-21 21:52:32,982 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:32,993 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:32,994 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:32,994 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:53, output treesize:49 [2020-12-21 21:52:33,114 INFO L348 Elim1Store]: treesize reduction 183, result has 16.8 percent of original size [2020-12-21 21:52:33,114 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 66 [2020-12-21 21:52:33,116 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:33,132 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:33,134 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:33,134 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:67, output treesize:63 [2020-12-21 21:52:33,279 INFO L348 Elim1Store]: treesize reduction 280, result has 14.9 percent of original size [2020-12-21 21:52:33,279 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 75 treesize of output 83 [2020-12-21 21:52:33,281 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:33,301 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:33,302 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:33,302 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:81, output treesize:77 [2020-12-21 21:52:33,492 INFO L348 Elim1Store]: treesize reduction 395, result has 13.4 percent of original size [2020-12-21 21:52:33,493 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 89 treesize of output 100 [2020-12-21 21:52:33,497 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:33,521 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:33,522 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:33,522 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:95, output treesize:91 [2020-12-21 21:52:33,754 WARN L197 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 38 [2020-12-21 21:52:33,756 INFO L348 Elim1Store]: treesize reduction 528, result has 12.1 percent of original size [2020-12-21 21:52:33,756 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 103 treesize of output 117 [2020-12-21 21:52:33,759 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:33,788 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:33,789 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:33,789 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:109, output treesize:105 [2020-12-21 21:52:34,061 WARN L197 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 43 [2020-12-21 21:52:34,062 INFO L348 Elim1Store]: treesize reduction 651, result has 11.5 percent of original size [2020-12-21 21:52:34,062 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 114 treesize of output 131 [2020-12-21 21:52:34,065 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:34,094 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:34,096 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:52:34,096 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:120, output treesize:116 [2020-12-21 21:52:35,748 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 9 disjuncts [2020-12-21 21:52:35,752 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 11 disjuncts [2020-12-21 21:52:35,869 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:35,869 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:35,870 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 44 [2020-12-21 21:52:35,870 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584433212] [2020-12-21 21:52:35,870 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-12-21 21:52:35,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:35,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-12-21 21:52:35,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1712, Unknown=0, NotChecked=0, Total=1892 [2020-12-21 21:52:35,872 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 44 states. [2020-12-21 21:52:38,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:38,225 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2020-12-21 21:52:38,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-21 21:52:38,226 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 45 [2020-12-21 21:52:38,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:38,226 INFO L225 Difference]: With dead ends: 53 [2020-12-21 21:52:38,226 INFO L226 Difference]: Without dead ends: 51 [2020-12-21 21:52:38,228 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=331, Invalid=2749, Unknown=0, NotChecked=0, Total=3080 [2020-12-21 21:52:38,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-21 21:52:38,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2020-12-21 21:52:38,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-21 21:52:38,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-12-21 21:52:38,238 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 45 [2020-12-21 21:52:38,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:38,239 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-12-21 21:52:38,239 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-12-21 21:52:38,239 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-12-21 21:52:38,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-21 21:52:38,239 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:38,240 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:38,454 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 21:52:38,455 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:38,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:38,456 INFO L82 PathProgramCache]: Analyzing trace with hash -59476011, now seen corresponding path program 16 times [2020-12-21 21:52:38,456 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:38,456 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349564474] [2020-12-21 21:52:38,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:38,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:38,787 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:38,787 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349564474] [2020-12-21 21:52:38,787 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539190430] [2020-12-21 21:52:38,788 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:38,851 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:52:38,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:38,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-21 21:52:38,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:39,296 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:39,296 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:39,296 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 37 [2020-12-21 21:52:39,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003385368] [2020-12-21 21:52:39,297 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-12-21 21:52:39,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:39,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-12-21 21:52:39,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=1015, Unknown=0, NotChecked=0, Total=1332 [2020-12-21 21:52:39,298 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 37 states. [2020-12-21 21:52:39,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:39,671 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2020-12-21 21:52:39,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-21 21:52:39,672 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 48 [2020-12-21 21:52:39,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:39,672 INFO L225 Difference]: With dead ends: 93 [2020-12-21 21:52:39,672 INFO L226 Difference]: Without dead ends: 56 [2020-12-21 21:52:39,674 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=537, Invalid=1719, Unknown=0, NotChecked=0, Total=2256 [2020-12-21 21:52:39,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-21 21:52:39,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2020-12-21 21:52:39,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-21 21:52:39,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2020-12-21 21:52:39,691 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 48 [2020-12-21 21:52:39,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:39,692 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2020-12-21 21:52:39,692 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-12-21 21:52:39,692 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2020-12-21 21:52:39,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:52:39,693 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:39,693 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:39,906 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:39,906 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:39,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:39,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1204565259, now seen corresponding path program 17 times [2020-12-21 21:52:39,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:39,908 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933308639] [2020-12-21 21:52:39,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:39,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:40,510 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:40,511 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933308639] [2020-12-21 21:52:40,511 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322465306] [2020-12-21 21:52:40,511 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:40,708 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2020-12-21 21:52:40,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:40,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 50 conjunts are in the unsatisfiable core [2020-12-21 21:52:40,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:40,738 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2020-12-21 21:52:40,738 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:40,744 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:40,745 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:52:40,746 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2020-12-21 21:52:41,382 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:41,383 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:41,383 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 37 [2020-12-21 21:52:41,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134632036] [2020-12-21 21:52:41,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-12-21 21:52:41,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:41,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-12-21 21:52:41,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=1239, Unknown=0, NotChecked=0, Total=1332 [2020-12-21 21:52:41,385 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 37 states. [2020-12-21 21:52:42,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:42,638 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2020-12-21 21:52:42,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-12-21 21:52:42,638 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 49 [2020-12-21 21:52:42,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:42,639 INFO L225 Difference]: With dead ends: 57 [2020-12-21 21:52:42,639 INFO L226 Difference]: Without dead ends: 55 [2020-12-21 21:52:42,640 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=189, Invalid=2361, Unknown=0, NotChecked=0, Total=2550 [2020-12-21 21:52:42,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-12-21 21:52:42,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2020-12-21 21:52:42,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-21 21:52:42,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-12-21 21:52:42,649 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 49 [2020-12-21 21:52:42,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:42,650 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-12-21 21:52:42,650 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-12-21 21:52:42,650 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-12-21 21:52:42,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-21 21:52:42,650 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:42,650 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:42,852 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:42,853 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:42,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:42,854 INFO L82 PathProgramCache]: Analyzing trace with hash 756666258, now seen corresponding path program 18 times [2020-12-21 21:52:42,854 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:42,854 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533512145] [2020-12-21 21:52:42,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:42,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:43,288 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:43,288 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533512145] [2020-12-21 21:52:43,288 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848791300] [2020-12-21 21:52:43,288 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:43,466 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2020-12-21 21:52:43,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:43,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-21 21:52:43,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:43,979 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:43,980 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:43,980 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 40 [2020-12-21 21:52:43,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895693014] [2020-12-21 21:52:43,983 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-21 21:52:43,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:43,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-21 21:52:43,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=1191, Unknown=0, NotChecked=0, Total=1560 [2020-12-21 21:52:43,984 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 40 states. [2020-12-21 21:52:44,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:44,391 INFO L93 Difference]: Finished difference Result 100 states and 102 transitions. [2020-12-21 21:52:44,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-21 21:52:44,392 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 52 [2020-12-21 21:52:44,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:44,392 INFO L225 Difference]: With dead ends: 100 [2020-12-21 21:52:44,392 INFO L226 Difference]: Without dead ends: 60 [2020-12-21 21:52:44,394 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=627, Invalid=2025, Unknown=0, NotChecked=0, Total=2652 [2020-12-21 21:52:44,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-21 21:52:44,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2020-12-21 21:52:44,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-21 21:52:44,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-12-21 21:52:44,404 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 52 [2020-12-21 21:52:44,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:44,405 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-12-21 21:52:44,405 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-21 21:52:44,405 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-12-21 21:52:44,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-21 21:52:44,405 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:44,405 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:44,606 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:44,606 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:44,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:44,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1598292424, now seen corresponding path program 19 times [2020-12-21 21:52:44,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:44,607 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202679451] [2020-12-21 21:52:44,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:44,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:45,313 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:45,314 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202679451] [2020-12-21 21:52:45,314 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961921043] [2020-12-21 21:52:45,314 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:45,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:45,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 62 conjunts are in the unsatisfiable core [2020-12-21 21:52:45,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:45,419 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2020-12-21 21:52:45,420 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:45,427 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:45,428 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:52:45,428 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2020-12-21 21:52:46,260 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:46,261 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:46,261 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29] total 41 [2020-12-21 21:52:46,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940186784] [2020-12-21 21:52:46,262 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-12-21 21:52:46,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:46,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-12-21 21:52:46,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1535, Unknown=0, NotChecked=0, Total=1640 [2020-12-21 21:52:46,263 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 41 states. [2020-12-21 21:52:47,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:47,728 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-12-21 21:52:47,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-12-21 21:52:47,728 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 53 [2020-12-21 21:52:47,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:47,729 INFO L225 Difference]: With dead ends: 61 [2020-12-21 21:52:47,729 INFO L226 Difference]: Without dead ends: 59 [2020-12-21 21:52:47,731 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=221, Invalid=2971, Unknown=0, NotChecked=0, Total=3192 [2020-12-21 21:52:47,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-21 21:52:47,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2020-12-21 21:52:47,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-21 21:52:47,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-12-21 21:52:47,742 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 53 [2020-12-21 21:52:47,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:47,742 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-12-21 21:52:47,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-12-21 21:52:47,742 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-12-21 21:52:47,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-12-21 21:52:47,743 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:47,743 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:47,949 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-21 21:52:47,950 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:47,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:47,950 INFO L82 PathProgramCache]: Analyzing trace with hash 726953397, now seen corresponding path program 20 times [2020-12-21 21:52:47,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:47,951 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373904398] [2020-12-21 21:52:47,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:47,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:48,409 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:48,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373904398] [2020-12-21 21:52:48,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479185792] [2020-12-21 21:52:48,410 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:48,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:52:48,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:48,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-21 21:52:48,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:49,090 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:49,090 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:49,091 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 43 [2020-12-21 21:52:49,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134333244] [2020-12-21 21:52:49,091 INFO L461 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-12-21 21:52:49,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:49,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-12-21 21:52:49,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=1381, Unknown=0, NotChecked=0, Total=1806 [2020-12-21 21:52:49,093 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 43 states. [2020-12-21 21:52:49,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:52:49,593 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2020-12-21 21:52:49,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-21 21:52:49,594 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 56 [2020-12-21 21:52:49,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:52:49,595 INFO L225 Difference]: With dead ends: 107 [2020-12-21 21:52:49,595 INFO L226 Difference]: Without dead ends: 64 [2020-12-21 21:52:49,597 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 735 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=724, Invalid=2356, Unknown=0, NotChecked=0, Total=3080 [2020-12-21 21:52:49,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-21 21:52:49,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 58. [2020-12-21 21:52:49,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-21 21:52:49,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2020-12-21 21:52:49,604 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2020-12-21 21:52:49,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:52:49,604 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2020-12-21 21:52:49,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-12-21 21:52:49,604 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2020-12-21 21:52:49,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-21 21:52:49,604 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:52:49,605 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:52:49,806 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2020-12-21 21:52:49,807 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:52:49,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:52:49,808 INFO L82 PathProgramCache]: Analyzing trace with hash -66153237, now seen corresponding path program 21 times [2020-12-21 21:52:49,808 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:52:49,809 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428704241] [2020-12-21 21:52:49,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:52:49,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:52:50,919 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:50,920 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428704241] [2020-12-21 21:52:50,920 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586888574] [2020-12-21 21:52:50,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:52:51,568 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2020-12-21 21:52:51,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:52:51,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 79 conjunts are in the unsatisfiable core [2020-12-21 21:52:51,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:52:51,654 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2020-12-21 21:52:51,654 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:51,661 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:51,661 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:51,662 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:18 [2020-12-21 21:52:51,728 INFO L348 Elim1Store]: treesize reduction 44, result has 21.4 percent of original size [2020-12-21 21:52:51,729 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2020-12-21 21:52:51,730 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:51,739 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:51,740 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:51,740 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2020-12-21 21:52:51,838 INFO L348 Elim1Store]: treesize reduction 64, result has 22.9 percent of original size [2020-12-21 21:52:51,838 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 34 [2020-12-21 21:52:51,840 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:51,849 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:51,849 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:51,850 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:35, output treesize:31 [2020-12-21 21:52:51,958 INFO L348 Elim1Store]: treesize reduction 114, result has 19.7 percent of original size [2020-12-21 21:52:51,959 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 46 [2020-12-21 21:52:51,960 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:51,972 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:51,973 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:51,974 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:44, output treesize:40 [2020-12-21 21:52:52,196 WARN L197 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 51 [2020-12-21 21:52:52,197 INFO L348 Elim1Store]: treesize reduction 72, result has 70.6 percent of original size [2020-12-21 21:52:52,197 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 199 [2020-12-21 21:52:52,201 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:52,256 INFO L625 ElimStorePlain]: treesize reduction 96, result has 36.0 percent of original size [2020-12-21 21:52:52,257 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:52,258 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:58, output treesize:54 [2020-12-21 21:52:52,540 WARN L197 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 56 [2020-12-21 21:52:52,541 INFO L348 Elim1Store]: treesize reduction 175, result has 51.4 percent of original size [2020-12-21 21:52:52,541 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 69 treesize of output 216 [2020-12-21 21:52:52,546 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:52,617 INFO L625 ElimStorePlain]: treesize reduction 96, result has 41.5 percent of original size [2020-12-21 21:52:52,618 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:52,618 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:72, output treesize:68 [2020-12-21 21:52:52,832 WARN L197 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 35 [2020-12-21 21:52:52,833 INFO L348 Elim1Store]: treesize reduction 336, result has 14.1 percent of original size [2020-12-21 21:52:52,833 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 68 treesize of output 82 [2020-12-21 21:52:52,836 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:52,856 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:52,857 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:52,858 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:71, output treesize:67 [2020-12-21 21:52:53,098 WARN L197 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 40 [2020-12-21 21:52:53,099 INFO L348 Elim1Store]: treesize reduction 434, result has 12.9 percent of original size [2020-12-21 21:52:53,099 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 77 treesize of output 94 [2020-12-21 21:52:53,107 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:53,131 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:53,133 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:53,133 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:80, output treesize:76 [2020-12-21 21:52:53,715 WARN L197 SmtUtils]: Spent 465.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 91 [2020-12-21 21:52:53,715 INFO L348 Elim1Store]: treesize reduction 336, result has 50.7 percent of original size [2020-12-21 21:52:53,716 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 91 treesize of output 383 [2020-12-21 21:52:53,723 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:53,852 WARN L197 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 52 [2020-12-21 21:52:53,853 INFO L625 ElimStorePlain]: treesize reduction 192, result has 31.9 percent of original size [2020-12-21 21:52:53,854 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:53,854 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:94, output treesize:90 [2020-12-21 21:52:54,255 WARN L197 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 50 [2020-12-21 21:52:54,256 INFO L348 Elim1Store]: treesize reduction 666, result has 11.0 percent of original size [2020-12-21 21:52:54,256 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 95 treesize of output 118 [2020-12-21 21:52:54,262 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:54,292 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:54,293 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:54,294 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:98, output treesize:94 [2020-12-21 21:52:55,156 WARN L197 SmtUtils]: Spent 724.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 111 [2020-12-21 21:52:55,157 INFO L348 Elim1Store]: treesize reduction 540, result has 44.4 percent of original size [2020-12-21 21:52:55,158 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 55 case distinctions, treesize of input 109 treesize of output 475 [2020-12-21 21:52:55,169 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:55,325 WARN L197 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 61 [2020-12-21 21:52:55,325 INFO L625 ElimStorePlain]: treesize reduction 240, result has 31.0 percent of original size [2020-12-21 21:52:55,327 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:55,327 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:112, output treesize:108 [2020-12-21 21:52:55,956 WARN L197 SmtUtils]: Spent 481.00 ms on a formula simplification. DAG size of input: 337 DAG size of output: 60 [2020-12-21 21:52:55,957 INFO L348 Elim1Store]: treesize reduction 946, result has 9.6 percent of original size [2020-12-21 21:52:55,957 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 66 case distinctions, treesize of input 113 treesize of output 142 [2020-12-21 21:52:55,960 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:52:55,996 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:52:55,998 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:52:55,998 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:113, output treesize:109 [2020-12-21 21:52:58,888 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:52:58,889 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:52:58,889 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31] total 59 [2020-12-21 21:52:58,889 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247886176] [2020-12-21 21:52:58,889 INFO L461 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-12-21 21:52:58,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:52:58,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-12-21 21:52:58,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=3274, Unknown=0, NotChecked=0, Total=3422 [2020-12-21 21:52:58,891 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 59 states. [2020-12-21 21:53:01,616 WARN L197 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 70 [2020-12-21 21:53:01,873 WARN L197 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 69 [2020-12-21 21:53:02,168 WARN L197 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 68 [2020-12-21 21:53:02,519 WARN L197 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 69 [2020-12-21 21:53:02,879 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 69 [2020-12-21 21:53:03,570 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 69 [2020-12-21 21:53:03,910 WARN L197 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 69 [2020-12-21 21:53:04,269 WARN L197 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 69 [2020-12-21 21:53:04,629 WARN L197 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 70 [2020-12-21 21:53:04,972 WARN L197 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 70 [2020-12-21 21:53:05,322 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 70 [2020-12-21 21:53:05,665 WARN L197 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 70 [2020-12-21 21:53:06,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:53:06,248 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2020-12-21 21:53:06,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-12-21 21:53:06,249 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 57 [2020-12-21 21:53:06,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:53:06,250 INFO L225 Difference]: With dead ends: 65 [2020-12-21 21:53:06,250 INFO L226 Difference]: Without dead ends: 63 [2020-12-21 21:53:06,251 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1184 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=370, Invalid=7286, Unknown=0, NotChecked=0, Total=7656 [2020-12-21 21:53:06,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-12-21 21:53:06,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2020-12-21 21:53:06,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-12-21 21:53:06,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2020-12-21 21:53:06,261 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2020-12-21 21:53:06,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:53:06,262 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2020-12-21 21:53:06,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-12-21 21:53:06,262 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2020-12-21 21:53:06,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-21 21:53:06,262 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:53:06,262 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:53:06,463 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:53:06,463 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:53:06,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:53:06,464 INFO L82 PathProgramCache]: Analyzing trace with hash 623698866, now seen corresponding path program 22 times [2020-12-21 21:53:06,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:53:06,465 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273889482] [2020-12-21 21:53:06,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:53:06,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:53:07,003 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:07,004 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273889482] [2020-12-21 21:53:07,004 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485388528] [2020-12-21 21:53:07,004 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:53:07,074 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:53:07,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:53:07,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 30 conjunts are in the unsatisfiable core [2020-12-21 21:53:07,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:53:07,814 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:07,815 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:53:07,815 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 46 [2020-12-21 21:53:07,815 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114274767] [2020-12-21 21:53:07,815 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-12-21 21:53:07,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:53:07,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-12-21 21:53:07,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=1585, Unknown=0, NotChecked=0, Total=2070 [2020-12-21 21:53:07,816 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 46 states. [2020-12-21 21:53:08,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:53:08,380 INFO L93 Difference]: Finished difference Result 114 states and 116 transitions. [2020-12-21 21:53:08,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-12-21 21:53:08,380 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 60 [2020-12-21 21:53:08,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:53:08,381 INFO L225 Difference]: With dead ends: 114 [2020-12-21 21:53:08,381 INFO L226 Difference]: Without dead ends: 68 [2020-12-21 21:53:08,383 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=828, Invalid=2712, Unknown=0, NotChecked=0, Total=3540 [2020-12-21 21:53:08,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-21 21:53:08,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 62. [2020-12-21 21:53:08,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-12-21 21:53:08,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2020-12-21 21:53:08,394 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 60 [2020-12-21 21:53:08,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:53:08,394 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2020-12-21 21:53:08,394 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-12-21 21:53:08,394 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2020-12-21 21:53:08,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:53:08,395 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:53:08,395 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:53:08,609 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2020-12-21 21:53:08,610 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:53:08,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:53:08,611 INFO L82 PathProgramCache]: Analyzing trace with hash 829718504, now seen corresponding path program 23 times [2020-12-21 21:53:08,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:53:08,611 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1925463767] [2020-12-21 21:53:08,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:53:08,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:53:09,602 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:09,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1925463767] [2020-12-21 21:53:09,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242558307] [2020-12-21 21:53:09,602 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:53:09,842 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2020-12-21 21:53:09,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:53:09,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 83 conjunts are in the unsatisfiable core [2020-12-21 21:53:09,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:53:09,861 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2020-12-21 21:53:09,862 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:09,871 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:09,872 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:09,872 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2020-12-21 21:53:09,963 INFO L348 Elim1Store]: treesize reduction 44, result has 21.4 percent of original size [2020-12-21 21:53:09,964 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2020-12-21 21:53:09,965 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:09,976 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:09,977 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:09,977 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:39, output treesize:35 [2020-12-21 21:53:10,089 INFO L348 Elim1Store]: treesize reduction 104, result has 19.4 percent of original size [2020-12-21 21:53:10,090 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 49 [2020-12-21 21:53:10,093 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:10,106 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:10,106 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:10,107 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:53, output treesize:49 [2020-12-21 21:53:10,249 INFO L348 Elim1Store]: treesize reduction 183, result has 16.8 percent of original size [2020-12-21 21:53:10,250 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 66 [2020-12-21 21:53:10,252 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:10,270 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:10,270 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:10,271 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:67, output treesize:63 [2020-12-21 21:53:10,452 INFO L348 Elim1Store]: treesize reduction 280, result has 14.9 percent of original size [2020-12-21 21:53:10,452 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 75 treesize of output 83 [2020-12-21 21:53:10,454 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:10,475 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:10,476 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:10,476 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:81, output treesize:77 [2020-12-21 21:53:10,704 INFO L348 Elim1Store]: treesize reduction 395, result has 13.4 percent of original size [2020-12-21 21:53:10,705 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 89 treesize of output 100 [2020-12-21 21:53:10,707 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:10,733 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:10,734 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:10,734 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:95, output treesize:91 [2020-12-21 21:53:11,006 WARN L197 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 38 [2020-12-21 21:53:11,006 INFO L348 Elim1Store]: treesize reduction 528, result has 12.1 percent of original size [2020-12-21 21:53:11,007 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 103 treesize of output 117 [2020-12-21 21:53:11,009 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:11,040 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:11,042 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:11,042 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:109, output treesize:105 [2020-12-21 21:53:11,384 WARN L197 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 43 [2020-12-21 21:53:11,384 INFO L348 Elim1Store]: treesize reduction 679, result has 11.1 percent of original size [2020-12-21 21:53:11,385 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 117 treesize of output 134 [2020-12-21 21:53:11,388 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:11,424 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:11,425 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:11,426 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:123, output treesize:119 [2020-12-21 21:53:11,833 WARN L197 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 48 [2020-12-21 21:53:11,833 INFO L348 Elim1Store]: treesize reduction 848, result has 10.3 percent of original size [2020-12-21 21:53:11,834 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 131 treesize of output 151 [2020-12-21 21:53:11,837 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:11,878 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:11,880 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:11,880 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:137, output treesize:133 [2020-12-21 21:53:12,361 WARN L197 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 246 DAG size of output: 53 [2020-12-21 21:53:12,362 INFO L348 Elim1Store]: treesize reduction 1035, result has 9.5 percent of original size [2020-12-21 21:53:12,362 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 145 treesize of output 168 [2020-12-21 21:53:12,366 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:12,412 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:12,413 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:12,413 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:151, output treesize:147 [2020-12-21 21:53:13,041 WARN L197 SmtUtils]: Spent 419.00 ms on a formula simplification. DAG size of input: 292 DAG size of output: 58 [2020-12-21 21:53:13,042 INFO L348 Elim1Store]: treesize reduction 1240, result has 8.9 percent of original size [2020-12-21 21:53:13,042 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 55 case distinctions, treesize of input 159 treesize of output 185 [2020-12-21 21:53:13,048 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:13,098 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:13,099 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:13,100 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:165, output treesize:161 [2020-12-21 21:53:13,823 WARN L197 SmtUtils]: Spent 513.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 63 [2020-12-21 21:53:13,824 INFO L348 Elim1Store]: treesize reduction 1419, result has 8.6 percent of original size [2020-12-21 21:53:13,825 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 66 case distinctions, treesize of input 170 treesize of output 199 [2020-12-21 21:53:13,833 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:13,887 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:13,890 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:53:13,890 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:176, output treesize:172 [2020-12-21 21:53:17,447 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 13 disjuncts [2020-12-21 21:53:17,451 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 15 disjuncts [2020-12-21 21:53:17,643 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:17,643 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:53:17,644 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33] total 60 [2020-12-21 21:53:17,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961914636] [2020-12-21 21:53:17,644 INFO L461 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-12-21 21:53:17,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:53:17,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-12-21 21:53:17,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=3262, Unknown=0, NotChecked=0, Total=3540 [2020-12-21 21:53:17,645 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand 60 states. [2020-12-21 21:53:23,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:53:23,817 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2020-12-21 21:53:23,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-12-21 21:53:23,818 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 61 [2020-12-21 21:53:23,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:53:23,818 INFO L225 Difference]: With dead ends: 69 [2020-12-21 21:53:23,818 INFO L226 Difference]: Without dead ends: 67 [2020-12-21 21:53:23,819 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 843 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=515, Invalid=5185, Unknown=0, NotChecked=0, Total=5700 [2020-12-21 21:53:23,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-21 21:53:23,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2020-12-21 21:53:23,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-12-21 21:53:23,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2020-12-21 21:53:23,833 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 61 [2020-12-21 21:53:23,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:53:23,833 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2020-12-21 21:53:23,833 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-12-21 21:53:23,834 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2020-12-21 21:53:23,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-12-21 21:53:23,834 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:53:23,834 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:53:24,048 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:53:24,049 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:53:24,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:53:24,050 INFO L82 PathProgramCache]: Analyzing trace with hash 611957653, now seen corresponding path program 24 times [2020-12-21 21:53:24,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:53:24,050 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674061018] [2020-12-21 21:53:24,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:53:24,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:53:24,718 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:24,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674061018] [2020-12-21 21:53:24,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327902105] [2020-12-21 21:53:24,718 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:53:25,125 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2020-12-21 21:53:25,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:53:25,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 32 conjunts are in the unsatisfiable core [2020-12-21 21:53:25,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:53:26,040 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:26,040 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:53:26,040 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 49 [2020-12-21 21:53:26,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574148839] [2020-12-21 21:53:26,041 INFO L461 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-12-21 21:53:26,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:53:26,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-12-21 21:53:26,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=1803, Unknown=0, NotChecked=0, Total=2352 [2020-12-21 21:53:26,042 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand 49 states. [2020-12-21 21:53:26,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:53:26,727 INFO L93 Difference]: Finished difference Result 121 states and 123 transitions. [2020-12-21 21:53:26,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-12-21 21:53:26,728 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 64 [2020-12-21 21:53:26,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:53:26,729 INFO L225 Difference]: With dead ends: 121 [2020-12-21 21:53:26,729 INFO L226 Difference]: Without dead ends: 72 [2020-12-21 21:53:26,730 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 969 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=939, Invalid=3093, Unknown=0, NotChecked=0, Total=4032 [2020-12-21 21:53:26,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-12-21 21:53:26,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 66. [2020-12-21 21:53:26,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-21 21:53:26,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2020-12-21 21:53:26,742 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 64 [2020-12-21 21:53:26,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:53:26,742 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2020-12-21 21:53:26,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-12-21 21:53:26,742 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2020-12-21 21:53:26,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-21 21:53:26,743 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:53:26,743 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:53:26,943 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-21 21:53:26,944 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:53:26,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:53:26,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1317817547, now seen corresponding path program 25 times [2020-12-21 21:53:26,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:53:26,945 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993308213] [2020-12-21 21:53:26,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:53:26,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:53:28,195 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:28,196 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993308213] [2020-12-21 21:53:28,196 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634555386] [2020-12-21 21:53:28,196 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:53:28,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:53:28,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 74 conjunts are in the unsatisfiable core [2020-12-21 21:53:28,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:53:28,323 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2020-12-21 21:53:28,325 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:28,332 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:28,334 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:53:28,334 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2020-12-21 21:53:29,756 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:29,756 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:53:29,756 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35] total 50 [2020-12-21 21:53:29,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666176530] [2020-12-21 21:53:29,757 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-12-21 21:53:29,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:53:29,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-12-21 21:53:29,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=2321, Unknown=0, NotChecked=0, Total=2450 [2020-12-21 21:53:29,758 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 50 states. [2020-12-21 21:53:32,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:53:32,533 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2020-12-21 21:53:32,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-12-21 21:53:32,535 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 65 [2020-12-21 21:53:32,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:53:32,536 INFO L225 Difference]: With dead ends: 73 [2020-12-21 21:53:32,536 INFO L226 Difference]: Without dead ends: 71 [2020-12-21 21:53:32,536 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 576 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=266, Invalid=4426, Unknown=0, NotChecked=0, Total=4692 [2020-12-21 21:53:32,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-12-21 21:53:32,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2020-12-21 21:53:32,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-12-21 21:53:32,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2020-12-21 21:53:32,550 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 65 [2020-12-21 21:53:32,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:53:32,551 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2020-12-21 21:53:32,551 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-12-21 21:53:32,551 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2020-12-21 21:53:32,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-12-21 21:53:32,551 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:53:32,551 INFO L422 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:53:32,752 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2020-12-21 21:53:32,752 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:53:32,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:53:32,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1188716590, now seen corresponding path program 26 times [2020-12-21 21:53:32,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:53:32,753 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401559978] [2020-12-21 21:53:32,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:53:32,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:53:33,553 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:33,554 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401559978] [2020-12-21 21:53:33,554 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632979236] [2020-12-21 21:53:33,554 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:53:33,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:53:33,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:53:33,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 34 conjunts are in the unsatisfiable core [2020-12-21 21:53:33,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:53:34,677 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:34,678 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:53:34,678 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 52 [2020-12-21 21:53:34,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921252769] [2020-12-21 21:53:34,678 INFO L461 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-12-21 21:53:34,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:53:34,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-12-21 21:53:34,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=617, Invalid=2035, Unknown=0, NotChecked=0, Total=2652 [2020-12-21 21:53:34,679 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 52 states. [2020-12-21 21:53:35,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:53:35,469 INFO L93 Difference]: Finished difference Result 128 states and 130 transitions. [2020-12-21 21:53:35,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-12-21 21:53:35,470 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 68 [2020-12-21 21:53:35,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:53:35,471 INFO L225 Difference]: With dead ends: 128 [2020-12-21 21:53:35,471 INFO L226 Difference]: Without dead ends: 76 [2020-12-21 21:53:35,472 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1098 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1057, Invalid=3499, Unknown=0, NotChecked=0, Total=4556 [2020-12-21 21:53:35,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-21 21:53:35,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 70. [2020-12-21 21:53:35,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-12-21 21:53:35,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2020-12-21 21:53:35,488 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 68 [2020-12-21 21:53:35,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:53:35,488 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2020-12-21 21:53:35,488 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-12-21 21:53:35,488 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2020-12-21 21:53:35,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-12-21 21:53:35,488 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:53:35,489 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:53:35,703 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-21 21:53:35,704 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:53:35,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:53:35,705 INFO L82 PathProgramCache]: Analyzing trace with hash -2004834808, now seen corresponding path program 27 times [2020-12-21 21:53:35,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:53:35,705 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132790898] [2020-12-21 21:53:35,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:53:35,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:53:37,162 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:37,162 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132790898] [2020-12-21 21:53:37,162 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014681224] [2020-12-21 21:53:37,163 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:53:37,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2020-12-21 21:53:37,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:53:37,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 95 conjunts are in the unsatisfiable core [2020-12-21 21:53:37,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:53:37,834 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2020-12-21 21:53:37,835 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:37,845 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:37,846 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:37,846 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2020-12-21 21:53:37,957 INFO L348 Elim1Store]: treesize reduction 44, result has 21.4 percent of original size [2020-12-21 21:53:37,957 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2020-12-21 21:53:37,959 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:37,971 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:37,972 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:37,972 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:39, output treesize:35 [2020-12-21 21:53:38,110 INFO L348 Elim1Store]: treesize reduction 104, result has 19.4 percent of original size [2020-12-21 21:53:38,110 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 49 [2020-12-21 21:53:38,113 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:38,129 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:38,130 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:38,130 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:53, output treesize:49 [2020-12-21 21:53:38,303 INFO L348 Elim1Store]: treesize reduction 183, result has 16.8 percent of original size [2020-12-21 21:53:38,304 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 66 [2020-12-21 21:53:38,306 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:38,326 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:38,327 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:38,327 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:67, output treesize:63 [2020-12-21 21:53:38,534 INFO L348 Elim1Store]: treesize reduction 280, result has 14.9 percent of original size [2020-12-21 21:53:38,535 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 75 treesize of output 83 [2020-12-21 21:53:38,537 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:38,560 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:38,561 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:38,562 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:81, output treesize:77 [2020-12-21 21:53:38,813 INFO L348 Elim1Store]: treesize reduction 395, result has 13.4 percent of original size [2020-12-21 21:53:38,814 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 89 treesize of output 100 [2020-12-21 21:53:38,816 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:38,846 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:38,847 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:38,847 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:95, output treesize:91 [2020-12-21 21:53:39,152 WARN L197 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 38 [2020-12-21 21:53:39,153 INFO L348 Elim1Store]: treesize reduction 528, result has 12.1 percent of original size [2020-12-21 21:53:39,153 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 103 treesize of output 117 [2020-12-21 21:53:39,158 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:39,191 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:39,192 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:39,193 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:109, output treesize:105 [2020-12-21 21:53:39,570 WARN L197 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 43 [2020-12-21 21:53:39,571 INFO L348 Elim1Store]: treesize reduction 679, result has 11.1 percent of original size [2020-12-21 21:53:39,571 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 117 treesize of output 134 [2020-12-21 21:53:39,574 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:39,613 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:39,615 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:39,615 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:123, output treesize:119 [2020-12-21 21:53:40,051 WARN L197 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 48 [2020-12-21 21:53:40,052 INFO L348 Elim1Store]: treesize reduction 848, result has 10.3 percent of original size [2020-12-21 21:53:40,053 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 131 treesize of output 151 [2020-12-21 21:53:40,056 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:40,100 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:40,101 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:40,102 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:137, output treesize:133 [2020-12-21 21:53:40,640 WARN L197 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 246 DAG size of output: 53 [2020-12-21 21:53:40,641 INFO L348 Elim1Store]: treesize reduction 1035, result has 9.5 percent of original size [2020-12-21 21:53:40,641 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 145 treesize of output 168 [2020-12-21 21:53:40,645 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:40,696 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:40,697 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:40,697 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:151, output treesize:147 [2020-12-21 21:53:41,353 WARN L197 SmtUtils]: Spent 427.00 ms on a formula simplification. DAG size of input: 292 DAG size of output: 58 [2020-12-21 21:53:41,354 INFO L348 Elim1Store]: treesize reduction 1240, result has 8.9 percent of original size [2020-12-21 21:53:41,354 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 55 case distinctions, treesize of input 159 treesize of output 185 [2020-12-21 21:53:41,357 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:41,412 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:41,413 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:41,413 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:165, output treesize:161 [2020-12-21 21:53:42,207 WARN L197 SmtUtils]: Spent 556.00 ms on a formula simplification. DAG size of input: 342 DAG size of output: 63 [2020-12-21 21:53:42,208 INFO L348 Elim1Store]: treesize reduction 1463, result has 8.3 percent of original size [2020-12-21 21:53:42,208 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 66 case distinctions, treesize of input 173 treesize of output 202 [2020-12-21 21:53:42,212 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:42,274 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:42,275 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:42,275 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:179, output treesize:175 [2020-12-21 21:53:43,142 WARN L197 SmtUtils]: Spent 614.00 ms on a formula simplification. DAG size of input: 396 DAG size of output: 68 [2020-12-21 21:53:43,143 INFO L348 Elim1Store]: treesize reduction 1704, result has 7.8 percent of original size [2020-12-21 21:53:43,144 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 78 case distinctions, treesize of input 187 treesize of output 219 [2020-12-21 21:53:43,153 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:43,219 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:43,221 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:53:43,221 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:193, output treesize:189 [2020-12-21 21:53:44,327 WARN L197 SmtUtils]: Spent 822.00 ms on a formula simplification. DAG size of input: 451 DAG size of output: 73 [2020-12-21 21:53:44,328 INFO L348 Elim1Store]: treesize reduction 1911, result has 7.6 percent of original size [2020-12-21 21:53:44,329 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 13 select indices, 13 select index equivalence classes, 0 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 91 case distinctions, treesize of input 198 treesize of output 233 [2020-12-21 21:53:44,332 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:53:44,406 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:53:44,408 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:53:44,409 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:204, output treesize:200 [2020-12-21 21:53:49,699 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 15 disjuncts [2020-12-21 21:53:49,703 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 17 disjuncts [2020-12-21 21:53:49,966 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:53:49,966 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:53:49,966 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37] total 68 [2020-12-21 21:53:49,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21458682] [2020-12-21 21:53:49,967 INFO L461 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-12-21 21:53:49,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:53:49,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-12-21 21:53:49,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=4223, Unknown=0, NotChecked=0, Total=4556 [2020-12-21 21:53:49,968 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 68 states. [2020-12-21 21:53:58,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:53:58,713 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2020-12-21 21:53:58,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-21 21:53:58,714 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 69 [2020-12-21 21:53:58,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:53:58,715 INFO L225 Difference]: With dead ends: 77 [2020-12-21 21:53:58,715 INFO L226 Difference]: Without dead ends: 75 [2020-12-21 21:53:58,716 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=619, Invalid=6691, Unknown=0, NotChecked=0, Total=7310 [2020-12-21 21:53:58,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-12-21 21:53:58,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2020-12-21 21:53:58,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-12-21 21:53:58,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2020-12-21 21:53:58,744 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 69 [2020-12-21 21:53:58,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:53:58,744 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2020-12-21 21:53:58,744 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-12-21 21:53:58,744 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2020-12-21 21:53:58,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-12-21 21:53:58,745 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:53:58,745 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:53:58,945 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:53:58,946 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:53:58,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:53:58,947 INFO L82 PathProgramCache]: Analyzing trace with hash -213753483, now seen corresponding path program 28 times [2020-12-21 21:53:58,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:53:58,947 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132753120] [2020-12-21 21:53:58,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:53:58,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:54:00,073 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:00,073 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132753120] [2020-12-21 21:54:00,073 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604259371] [2020-12-21 21:54:00,073 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:54:00,158 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:54:00,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:54:00,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 36 conjunts are in the unsatisfiable core [2020-12-21 21:54:00,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:54:01,506 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:01,506 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:54:01,506 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 55 [2020-12-21 21:54:01,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891329019] [2020-12-21 21:54:01,507 INFO L461 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-12-21 21:54:01,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:54:01,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-12-21 21:54:01,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=689, Invalid=2281, Unknown=0, NotChecked=0, Total=2970 [2020-12-21 21:54:01,508 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 55 states. [2020-12-21 21:54:02,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:54:02,408 INFO L93 Difference]: Finished difference Result 135 states and 137 transitions. [2020-12-21 21:54:02,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-12-21 21:54:02,410 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 72 [2020-12-21 21:54:02,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:54:02,411 INFO L225 Difference]: With dead ends: 135 [2020-12-21 21:54:02,411 INFO L226 Difference]: Without dead ends: 80 [2020-12-21 21:54:02,412 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1235 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1182, Invalid=3930, Unknown=0, NotChecked=0, Total=5112 [2020-12-21 21:54:02,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-21 21:54:02,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 74. [2020-12-21 21:54:02,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-12-21 21:54:02,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2020-12-21 21:54:02,432 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 72 [2020-12-21 21:54:02,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:54:02,433 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2020-12-21 21:54:02,433 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-12-21 21:54:02,433 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2020-12-21 21:54:02,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-21 21:54:02,433 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:54:02,433 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:54:02,646 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2020-12-21 21:54:02,647 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:54:02,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:54:02,647 INFO L82 PathProgramCache]: Analyzing trace with hash -190620501, now seen corresponding path program 29 times [2020-12-21 21:54:02,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:54:02,648 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616851953] [2020-12-21 21:54:02,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:54:02,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:54:04,726 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:04,726 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616851953] [2020-12-21 21:54:04,727 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [66801779] [2020-12-21 21:54:04,727 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:54:05,067 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2020-12-21 21:54:05,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:54:05,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 74 conjunts are in the unsatisfiable core [2020-12-21 21:54:05,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:54:06,587 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-12-21 21:54:06,589 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:54:06,592 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:54:06,592 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:54:06,593 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:9 [2020-12-21 21:54:09,329 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:09,329 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:54:09,329 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 74 [2020-12-21 21:54:09,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941801226] [2020-12-21 21:54:09,330 INFO L461 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-12-21 21:54:09,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:54:09,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-12-21 21:54:09,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=5218, Unknown=0, NotChecked=0, Total=5402 [2020-12-21 21:54:09,331 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand 74 states. [2020-12-21 21:54:17,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:54:17,181 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2020-12-21 21:54:17,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-12-21 21:54:17,183 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 73 [2020-12-21 21:54:17,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:54:17,186 INFO L225 Difference]: With dead ends: 81 [2020-12-21 21:54:17,186 INFO L226 Difference]: Without dead ends: 79 [2020-12-21 21:54:17,189 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1175 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=448, Invalid=11324, Unknown=0, NotChecked=0, Total=11772 [2020-12-21 21:54:17,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-12-21 21:54:17,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2020-12-21 21:54:17,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-12-21 21:54:17,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2020-12-21 21:54:17,206 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 73 [2020-12-21 21:54:17,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:54:17,207 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2020-12-21 21:54:17,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-12-21 21:54:17,207 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2020-12-21 21:54:17,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-12-21 21:54:17,207 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:54:17,207 INFO L422 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:54:17,414 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:54:17,415 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:54:17,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:54:17,416 INFO L82 PathProgramCache]: Analyzing trace with hash -823786510, now seen corresponding path program 30 times [2020-12-21 21:54:17,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:54:17,416 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040148501] [2020-12-21 21:54:17,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:54:17,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:54:18,642 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 393 proven. 202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:18,642 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040148501] [2020-12-21 21:54:18,642 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583712250] [2020-12-21 21:54:18,643 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:54:19,266 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2020-12-21 21:54:19,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:54:19,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 38 conjunts are in the unsatisfiable core [2020-12-21 21:54:19,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:54:20,845 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:20,846 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:54:20,846 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 58 [2020-12-21 21:54:20,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487148630] [2020-12-21 21:54:20,847 INFO L461 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-12-21 21:54:20,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:54:20,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-12-21 21:54:20,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=765, Invalid=2541, Unknown=0, NotChecked=0, Total=3306 [2020-12-21 21:54:20,848 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 58 states. [2020-12-21 21:54:22,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:54:22,000 INFO L93 Difference]: Finished difference Result 142 states and 144 transitions. [2020-12-21 21:54:22,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-12-21 21:54:22,002 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 76 [2020-12-21 21:54:22,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:54:22,003 INFO L225 Difference]: With dead ends: 142 [2020-12-21 21:54:22,003 INFO L226 Difference]: Without dead ends: 84 [2020-12-21 21:54:22,004 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1380 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1314, Invalid=4386, Unknown=0, NotChecked=0, Total=5700 [2020-12-21 21:54:22,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-12-21 21:54:22,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 78. [2020-12-21 21:54:22,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-12-21 21:54:22,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2020-12-21 21:54:22,023 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 76 [2020-12-21 21:54:22,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:54:22,023 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2020-12-21 21:54:22,023 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-12-21 21:54:22,023 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2020-12-21 21:54:22,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-12-21 21:54:22,024 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:54:22,024 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:54:22,224 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2020-12-21 21:54:22,225 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:54:22,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:54:22,226 INFO L82 PathProgramCache]: Analyzing trace with hash -196447192, now seen corresponding path program 31 times [2020-12-21 21:54:22,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:54:22,226 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141534755] [2020-12-21 21:54:22,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:54:22,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:54:24,506 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:24,506 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141534755] [2020-12-21 21:54:24,506 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074236148] [2020-12-21 21:54:24,506 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:54:24,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:54:24,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 86 conjunts are in the unsatisfiable core [2020-12-21 21:54:24,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:54:24,666 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2020-12-21 21:54:24,668 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:54:24,678 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:54:24,680 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-21 21:54:24,680 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2020-12-21 21:54:27,177 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:27,177 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:54:27,178 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41] total 59 [2020-12-21 21:54:27,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443363649] [2020-12-21 21:54:27,178 INFO L461 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-12-21 21:54:27,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:54:27,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-12-21 21:54:27,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=3269, Unknown=0, NotChecked=0, Total=3422 [2020-12-21 21:54:27,179 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 59 states. [2020-12-21 21:54:32,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:54:32,640 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2020-12-21 21:54:32,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-12-21 21:54:32,642 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 77 [2020-12-21 21:54:32,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:54:32,643 INFO L225 Difference]: With dead ends: 85 [2020-12-21 21:54:32,643 INFO L226 Difference]: Without dead ends: 83 [2020-12-21 21:54:32,644 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 798 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=311, Invalid=6169, Unknown=0, NotChecked=0, Total=6480 [2020-12-21 21:54:32,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-12-21 21:54:32,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 81. [2020-12-21 21:54:32,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-12-21 21:54:32,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2020-12-21 21:54:32,663 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 77 [2020-12-21 21:54:32,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:54:32,663 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2020-12-21 21:54:32,663 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-12-21 21:54:32,663 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2020-12-21 21:54:32,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-12-21 21:54:32,664 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:54:32,664 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:54:32,877 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2020-12-21 21:54:32,877 INFO L429 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:54:32,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:54:32,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1686921045, now seen corresponding path program 32 times [2020-12-21 21:54:32,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:54:32,879 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011499832] [2020-12-21 21:54:32,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:54:32,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:54:34,215 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 443 proven. 223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:34,216 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011499832] [2020-12-21 21:54:34,216 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260875450] [2020-12-21 21:54:34,216 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:54:34,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:54:34,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:54:34,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 40 conjunts are in the unsatisfiable core [2020-12-21 21:54:34,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:54:36,091 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:36,091 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:54:36,091 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 61 [2020-12-21 21:54:36,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259242750] [2020-12-21 21:54:36,092 INFO L461 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-12-21 21:54:36,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:54:36,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-12-21 21:54:36,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=845, Invalid=2815, Unknown=0, NotChecked=0, Total=3660 [2020-12-21 21:54:36,093 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 61 states. [2020-12-21 21:54:37,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:54:37,391 INFO L93 Difference]: Finished difference Result 149 states and 151 transitions. [2020-12-21 21:54:37,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-12-21 21:54:37,393 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 80 [2020-12-21 21:54:37,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:54:37,394 INFO L225 Difference]: With dead ends: 149 [2020-12-21 21:54:37,394 INFO L226 Difference]: Without dead ends: 88 [2020-12-21 21:54:37,395 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1533 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1453, Invalid=4867, Unknown=0, NotChecked=0, Total=6320 [2020-12-21 21:54:37,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-12-21 21:54:37,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2020-12-21 21:54:37,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-12-21 21:54:37,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2020-12-21 21:54:37,414 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 80 [2020-12-21 21:54:37,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:54:37,414 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2020-12-21 21:54:37,414 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-12-21 21:54:37,414 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2020-12-21 21:54:37,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-12-21 21:54:37,414 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:54:37,414 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:54:37,615 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2020-12-21 21:54:37,616 INFO L429 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:54:37,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:54:37,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1697760395, now seen corresponding path program 33 times [2020-12-21 21:54:37,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:54:37,617 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865627640] [2020-12-21 21:54:37,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:54:37,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:54:40,206 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:40,206 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865627640] [2020-12-21 21:54:40,206 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773224723] [2020-12-21 21:54:40,207 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:54:42,139 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2020-12-21 21:54:42,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:54:42,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 88 conjunts are in the unsatisfiable core [2020-12-21 21:54:42,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:54:44,590 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-12-21 21:54:44,591 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:54:44,599 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:54:44,600 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:54:44,600 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:13 [2020-12-21 21:54:48,657 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-21 21:54:48,658 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-21 21:54:48,659 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-21 21:54:48,832 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 477 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:54:48,833 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:54:48,833 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 43] total 83 [2020-12-21 21:54:48,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683098739] [2020-12-21 21:54:48,833 INFO L461 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-12-21 21:54:48,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:54:48,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-12-21 21:54:48,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=6410, Unknown=0, NotChecked=0, Total=6806 [2020-12-21 21:54:48,834 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 83 states. [2020-12-21 21:55:04,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:55:04,472 INFO L93 Difference]: Finished difference Result 149 states and 152 transitions. [2020-12-21 21:55:04,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2020-12-21 21:55:04,473 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 81 [2020-12-21 21:55:04,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:55:04,474 INFO L225 Difference]: With dead ends: 149 [2020-12-21 21:55:04,474 INFO L226 Difference]: Without dead ends: 88 [2020-12-21 21:55:04,476 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8124 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=1738, Invalid=29768, Unknown=0, NotChecked=0, Total=31506 [2020-12-21 21:55:04,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-12-21 21:55:04,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2020-12-21 21:55:04,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-12-21 21:55:04,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2020-12-21 21:55:04,500 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 81 [2020-12-21 21:55:04,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:55:04,500 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2020-12-21 21:55:04,501 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-12-21 21:55:04,501 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2020-12-21 21:55:04,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-12-21 21:55:04,501 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:55:04,501 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:55:04,703 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2020-12-21 21:55:04,704 INFO L429 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:55:04,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:55:04,704 INFO L82 PathProgramCache]: Analyzing trace with hash -751572408, now seen corresponding path program 34 times [2020-12-21 21:55:04,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:55:04,704 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944028264] [2020-12-21 21:55:04,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:55:04,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:55:08,415 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:55:08,415 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944028264] [2020-12-21 21:55:08,416 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181229147] [2020-12-21 21:55:08,416 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:55:08,517 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:55:08,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:55:08,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 94 conjunts are in the unsatisfiable core [2020-12-21 21:55:08,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:55:08,649 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-12-21 21:55:08,650 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:55:08,654 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:55:08,655 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:55:08,655 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:9 [2020-12-21 21:55:09,346 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:55:09,347 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:55:09,347 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45] total 46 [2020-12-21 21:55:09,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838593926] [2020-12-21 21:55:09,347 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-12-21 21:55:09,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:55:09,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-12-21 21:55:09,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1958, Unknown=0, NotChecked=0, Total=2070 [2020-12-21 21:55:09,348 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand 46 states. [2020-12-21 21:55:15,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:55:15,399 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2020-12-21 21:55:15,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-12-21 21:55:15,401 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 85 [2020-12-21 21:55:15,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:55:15,402 INFO L225 Difference]: With dead ends: 93 [2020-12-21 21:55:15,402 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 21:55:15,403 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 80 SyntacticMatches, 4 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=263, Invalid=4567, Unknown=0, NotChecked=0, Total=4830 [2020-12-21 21:55:15,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 21:55:15,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 89. [2020-12-21 21:55:15,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-12-21 21:55:15,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2020-12-21 21:55:15,428 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 85 [2020-12-21 21:55:15,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:55:15,429 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2020-12-21 21:55:15,429 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-12-21 21:55:15,429 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2020-12-21 21:55:15,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-12-21 21:55:15,429 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:55:15,430 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:55:15,634 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2020-12-21 21:55:15,635 INFO L429 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:55:15,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:55:15,636 INFO L82 PathProgramCache]: Analyzing trace with hash -424299211, now seen corresponding path program 35 times [2020-12-21 21:55:15,636 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:55:15,637 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132069774] [2020-12-21 21:55:15,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:55:15,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:55:17,522 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 552 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:55:17,523 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132069774] [2020-12-21 21:55:17,523 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138303940] [2020-12-21 21:55:17,523 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:55:17,966 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2020-12-21 21:55:17,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:55:17,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 44 conjunts are in the unsatisfiable core [2020-12-21 21:55:17,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:55:20,529 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:55:20,530 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:55:20,530 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 67 [2020-12-21 21:55:20,530 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027606255] [2020-12-21 21:55:20,530 INFO L461 AbstractCegarLoop]: Interpolant automaton has 67 states [2020-12-21 21:55:20,531 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:55:20,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2020-12-21 21:55:20,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=3405, Unknown=0, NotChecked=0, Total=4422 [2020-12-21 21:55:20,532 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 67 states. [2020-12-21 21:55:22,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:55:22,323 INFO L93 Difference]: Finished difference Result 163 states and 165 transitions. [2020-12-21 21:55:22,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-12-21 21:55:22,325 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 88 [2020-12-21 21:55:22,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:55:22,327 INFO L225 Difference]: With dead ends: 163 [2020-12-21 21:55:22,327 INFO L226 Difference]: Without dead ends: 96 [2020-12-21 21:55:22,328 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1863 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1752, Invalid=5904, Unknown=0, NotChecked=0, Total=7656 [2020-12-21 21:55:22,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-12-21 21:55:22,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2020-12-21 21:55:22,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-12-21 21:55:22,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2020-12-21 21:55:22,366 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 88 [2020-12-21 21:55:22,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:55:22,366 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2020-12-21 21:55:22,366 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2020-12-21 21:55:22,366 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2020-12-21 21:55:22,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-12-21 21:55:22,367 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:55:22,367 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:55:22,567 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2020-12-21 21:55:22,568 INFO L429 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:55:22,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:55:22,569 INFO L82 PathProgramCache]: Analyzing trace with hash -1198160789, now seen corresponding path program 36 times [2020-12-21 21:55:22,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:55:22,569 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526380752] [2020-12-21 21:55:22,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:55:22,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:55:26,428 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:55:26,429 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526380752] [2020-12-21 21:55:26,429 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934898497] [2020-12-21 21:55:26,429 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:55:28,366 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2020-12-21 21:55:28,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:55:28,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 101 conjunts are in the unsatisfiable core [2020-12-21 21:55:28,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:55:31,179 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2020-12-21 21:55:31,180 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:55:31,191 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:55:31,194 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:55:31,194 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:18 [2020-12-21 21:55:31,409 INFO L348 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2020-12-21 21:55:31,409 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2020-12-21 21:55:31,411 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:55:31,423 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:55:31,424 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:55:31,425 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:19 [2020-12-21 21:55:37,782 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:55:37,782 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:55:37,783 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47] total 91 [2020-12-21 21:55:37,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693825486] [2020-12-21 21:55:37,783 INFO L461 AbstractCegarLoop]: Interpolant automaton has 91 states [2020-12-21 21:55:37,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:55:37,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2020-12-21 21:55:37,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=7964, Unknown=0, NotChecked=0, Total=8190 [2020-12-21 21:55:37,785 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 91 states. [2020-12-21 21:55:56,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:55:56,681 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2020-12-21 21:55:56,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-12-21 21:55:56,683 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 89 [2020-12-21 21:55:56,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:55:56,684 INFO L225 Difference]: With dead ends: 97 [2020-12-21 21:55:56,684 INFO L226 Difference]: Without dead ends: 95 [2020-12-21 21:55:56,686 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1811 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=644, Invalid=17716, Unknown=0, NotChecked=0, Total=18360 [2020-12-21 21:55:56,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-12-21 21:55:56,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 93. [2020-12-21 21:55:56,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-12-21 21:55:56,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2020-12-21 21:55:56,715 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 89 [2020-12-21 21:55:56,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:55:56,716 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2020-12-21 21:55:56,716 INFO L482 AbstractCegarLoop]: Interpolant automaton has 91 states. [2020-12-21 21:55:56,716 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2020-12-21 21:55:56,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-12-21 21:55:56,716 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:55:56,716 INFO L422 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:55:56,917 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2020-12-21 21:55:56,918 INFO L429 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:55:56,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:55:56,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1069925426, now seen corresponding path program 37 times [2020-12-21 21:55:56,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:55:56,919 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812345496] [2020-12-21 21:55:56,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:55:56,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:55:59,189 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 611 proven. 292 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:55:59,189 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812345496] [2020-12-21 21:55:59,189 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109152476] [2020-12-21 21:55:59,189 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:55:59,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:55:59,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 46 conjunts are in the unsatisfiable core [2020-12-21 21:55:59,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:56:02,438 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:56:02,438 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:56:02,439 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 70 [2020-12-21 21:56:02,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683915798] [2020-12-21 21:56:02,439 INFO L461 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-12-21 21:56:02,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:56:02,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-12-21 21:56:02,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1109, Invalid=3721, Unknown=0, NotChecked=0, Total=4830 [2020-12-21 21:56:02,441 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 70 states. [2020-12-21 21:56:04,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:56:04,599 INFO L93 Difference]: Finished difference Result 170 states and 172 transitions. [2020-12-21 21:56:04,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-12-21 21:56:04,602 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 92 [2020-12-21 21:56:04,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:56:04,603 INFO L225 Difference]: With dead ends: 170 [2020-12-21 21:56:04,603 INFO L226 Difference]: Without dead ends: 100 [2020-12-21 21:56:04,604 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2040 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=1912, Invalid=6460, Unknown=0, NotChecked=0, Total=8372 [2020-12-21 21:56:04,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-12-21 21:56:04,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 94. [2020-12-21 21:56:04,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-12-21 21:56:04,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2020-12-21 21:56:04,628 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 92 [2020-12-21 21:56:04,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:56:04,628 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2020-12-21 21:56:04,628 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-12-21 21:56:04,628 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2020-12-21 21:56:04,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-12-21 21:56:04,629 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:56:04,629 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:56:04,829 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2020-12-21 21:56:04,830 INFO L429 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:56:04,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:56:04,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1914636392, now seen corresponding path program 38 times [2020-12-21 21:56:04,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:56:04,831 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669718310] [2020-12-21 21:56:04,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:56:04,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:56:09,442 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:56:09,442 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669718310] [2020-12-21 21:56:09,442 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583522422] [2020-12-21 21:56:09,442 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:56:09,560 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:56:09,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:56:09,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 105 conjunts are in the unsatisfiable core [2020-12-21 21:56:09,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:56:13,931 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-12-21 21:56:13,933 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-21 21:56:13,946 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-21 21:56:13,948 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-21 21:56:13,948 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:13