/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_two_index_01.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:43:30,613 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:43:30,618 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:43:30,675 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-21 21:43:30,778 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:43:30,829 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:43:30,830 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:43:30,834 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:43:30,835 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:43:30,835 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:43:30,835 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:43:30,835 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:43:30,835 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:43:30,836 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:43:30,836 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:43:30,837 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:43:30,837 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:43:30,838 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:43:30,838 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:43:30,838 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:43:30,838 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:43:30,838 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:43:30,839 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:43:30,839 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:43:30,839 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:43:30,839 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:43:30,840 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:43:30,840 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:43:30,840 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:43:30,840 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:43:30,840 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:43:31,318 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:43:31,349 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:43:31,352 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:43:31,354 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:43:31,355 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:43:31,356 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_01.i [2020-12-21 21:43:31,465 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/269a7fdef/59460974441c447cab7d1a4b0e78a70f/FLAGd44a53bb3 [2020-12-21 21:43:32,241 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:43:32,242 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_01.i [2020-12-21 21:43:32,255 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/269a7fdef/59460974441c447cab7d1a4b0e78a70f/FLAGd44a53bb3 [2020-12-21 21:43:32,563 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/269a7fdef/59460974441c447cab7d1a4b0e78a70f [2020-12-21 21:43:32,567 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:43:32,569 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:43:32,571 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:43:32,572 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:43:32,576 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:43:32,577 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,579 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b2fda72 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32, skipping insertion in model container [2020-12-21 21:43:32,579 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,589 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:43:32,606 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:43:32,763 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_01.i[814,827] [2020-12-21 21:43:32,781 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:43:32,791 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:43:32,806 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_01.i[814,827] [2020-12-21 21:43:32,815 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:43:32,833 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:43:32,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32 WrapperNode [2020-12-21 21:43:32,833 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:43:32,835 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:43:32,835 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:43:32,835 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:43:32,845 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,855 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,877 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:43:32,879 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:43:32,879 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:43:32,879 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:43:32,889 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,890 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,892 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,893 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,899 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,904 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,906 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (1/1) ... [2020-12-21 21:43:32,909 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:43:32,910 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:43:32,910 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:43:32,910 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:43:32,911 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (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 21:43:33,027 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:43:33,027 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:43:33,027 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:43:33,028 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:43:33,028 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:43:33,028 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:43:33,028 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:43:33,357 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:43:33,358 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-21 21:43:33,360 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:43:33 BoogieIcfgContainer [2020-12-21 21:43:33,360 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:43:33,362 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:43:33,362 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:43:33,366 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:43:33,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:43:32" (1/3) ... [2020-12-21 21:43:33,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a4476fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:43:33, skipping insertion in model container [2020-12-21 21:43:33,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:32" (2/3) ... [2020-12-21 21:43:33,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a4476fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:43:33, skipping insertion in model container [2020-12-21 21:43:33,369 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:43:33" (3/3) ... [2020-12-21 21:43:33,370 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_01.i [2020-12-21 21:43:33,377 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:43:33,384 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:43:33,412 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:43:33,538 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:43:33,539 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:43:33,541 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:43:33,541 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:43:33,542 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:43:33,542 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:43:33,542 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:43:33,542 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:43:33,572 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-12-21 21:43:33,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-21 21:43:33,579 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:33,580 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:33,581 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:33,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:33,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2020-12-21 21:43:33,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:33,598 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249558516] [2020-12-21 21:43:33,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:33,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:33,818 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 21:43:33,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249558516] [2020-12-21 21:43:33,820 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:43:33,820 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:43:33,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431499631] [2020-12-21 21:43:33,828 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:43:33,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:33,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:43:33,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:43:33,850 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2020-12-21 21:43:33,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:33,921 INFO L93 Difference]: Finished difference Result 34 states and 51 transitions. [2020-12-21 21:43:33,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:43:33,924 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-21 21:43:33,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:33,936 INFO L225 Difference]: With dead ends: 34 [2020-12-21 21:43:33,937 INFO L226 Difference]: Without dead ends: 18 [2020-12-21 21:43:33,940 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 21:43:33,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-21 21:43:33,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2020-12-21 21:43:33,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-21 21:43:33,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-12-21 21:43:33,987 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 9 [2020-12-21 21:43:33,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:33,987 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-12-21 21:43:33,988 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:43:33,988 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-12-21 21:43:33,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-21 21:43:33,988 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:33,989 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:33,989 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:43:33,989 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:33,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:33,990 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2020-12-21 21:43:33,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:33,991 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196891943] [2020-12-21 21:43:33,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:34,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:34,082 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:43:34,084 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196891943] [2020-12-21 21:43:34,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1042321325] [2020-12-21 21:43:34,088 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 21:43:34,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:34,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:43:34,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:34,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:43:34,339 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:34,339 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:43:34,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291283701] [2020-12-21 21:43:34,343 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:43:34,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:34,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:43:34,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:43:34,348 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 5 states. [2020-12-21 21:43:34,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:34,440 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-12-21 21:43:34,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:43:34,441 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-21 21:43:34,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:34,442 INFO L225 Difference]: With dead ends: 34 [2020-12-21 21:43:34,443 INFO L226 Difference]: Without dead ends: 25 [2020-12-21 21:43:34,444 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:43:34,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-21 21:43:34,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 15. [2020-12-21 21:43:34,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-21 21:43:34,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-21 21:43:34,450 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2020-12-21 21:43:34,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:34,450 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-21 21:43:34,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:43:34,451 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-21 21:43:34,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-21 21:43:34,451 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:34,451 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:34,666 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:43:34,668 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:34,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:34,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1117999992, now seen corresponding path program 2 times [2020-12-21 21:43:34,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:34,670 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636116876] [2020-12-21 21:43:34,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:34,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:34,795 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:43:34,796 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636116876] [2020-12-21 21:43:34,796 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951736806] [2020-12-21 21:43:34,796 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:34,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:43:34,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:34,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:43:34,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:34,914 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:43:34,915 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:34,915 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:43:34,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685370182] [2020-12-21 21:43:34,916 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:43:34,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:34,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:43:34,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:43:34,918 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 6 states. [2020-12-21 21:43:34,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:34,971 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-12-21 21:43:34,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:43:34,972 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-12-21 21:43:34,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:34,974 INFO L225 Difference]: With dead ends: 42 [2020-12-21 21:43:34,975 INFO L226 Difference]: Without dead ends: 32 [2020-12-21 21:43:34,976 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:43:34,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-21 21:43:34,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 17. [2020-12-21 21:43:34,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-21 21:43:34,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-21 21:43:34,982 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2020-12-21 21:43:34,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:34,982 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-21 21:43:34,982 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:43:34,982 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-21 21:43:34,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 21:43:34,983 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:34,983 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:35,198 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:35,199 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:35,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:35,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1025155465, now seen corresponding path program 3 times [2020-12-21 21:43:35,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:35,202 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990486836] [2020-12-21 21:43:35,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:35,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:35,362 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-21 21:43:35,363 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990486836] [2020-12-21 21:43:35,363 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066144178] [2020-12-21 21:43:35,363 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:35,482 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:43:35,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:35,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:43:35,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:35,526 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-21 21:43:35,526 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:35,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:43:35,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243829921] [2020-12-21 21:43:35,527 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:43:35,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:35,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:43:35,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:43:35,529 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 7 states. [2020-12-21 21:43:35,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:35,611 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-12-21 21:43:35,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:43:35,612 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-12-21 21:43:35,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:35,613 INFO L225 Difference]: With dead ends: 50 [2020-12-21 21:43:35,613 INFO L226 Difference]: Without dead ends: 39 [2020-12-21 21:43:35,614 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:43:35,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-21 21:43:35,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 19. [2020-12-21 21:43:35,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-21 21:43:35,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-12-21 21:43:35,620 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2020-12-21 21:43:35,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:35,621 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-12-21 21:43:35,621 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:43:35,621 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-12-21 21:43:35,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:43:35,622 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:35,622 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:35,835 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:35,836 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:35,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:35,838 INFO L82 PathProgramCache]: Analyzing trace with hash -57020904, now seen corresponding path program 4 times [2020-12-21 21:43:35,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:35,839 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000107351] [2020-12-21 21:43:35,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:35,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:35,950 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:43:35,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000107351] [2020-12-21 21:43:35,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321932186] [2020-12-21 21:43:35,951 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:36,011 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:43:36,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:36,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:43:36,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:36,070 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:43:36,070 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:36,071 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:43:36,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834792199] [2020-12-21 21:43:36,072 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:43:36,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:36,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:43:36,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:43:36,073 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-12-21 21:43:36,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:36,144 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-12-21 21:43:36,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:43:36,145 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-12-21 21:43:36,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:36,146 INFO L225 Difference]: With dead ends: 58 [2020-12-21 21:43:36,147 INFO L226 Difference]: Without dead ends: 46 [2020-12-21 21:43:36,147 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:43:36,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-21 21:43:36,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 21. [2020-12-21 21:43:36,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-21 21:43:36,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-12-21 21:43:36,154 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2020-12-21 21:43:36,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:36,154 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-12-21 21:43:36,154 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:43:36,155 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-12-21 21:43:36,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-21 21:43:36,155 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:36,156 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:36,368 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:36,369 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:36,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:36,371 INFO L82 PathProgramCache]: Analyzing trace with hash 315153751, now seen corresponding path program 5 times [2020-12-21 21:43:36,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:36,372 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975192092] [2020-12-21 21:43:36,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:36,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:36,454 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-21 21:43:36,455 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975192092] [2020-12-21 21:43:36,455 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734294182] [2020-12-21 21:43:36,455 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:36,651 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-21 21:43:36,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:36,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:43:36,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:36,702 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-21 21:43:36,703 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:36,703 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 21:43:36,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118882198] [2020-12-21 21:43:36,704 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:43:36,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:36,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:43:36,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:43:36,706 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 9 states. [2020-12-21 21:43:36,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:36,785 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-12-21 21:43:36,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 21:43:36,786 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-12-21 21:43:36,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:36,787 INFO L225 Difference]: With dead ends: 66 [2020-12-21 21:43:36,787 INFO L226 Difference]: Without dead ends: 53 [2020-12-21 21:43:36,788 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:43:36,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-21 21:43:36,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 23. [2020-12-21 21:43:36,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-21 21:43:36,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-12-21 21:43:36,793 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2020-12-21 21:43:36,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:36,794 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-12-21 21:43:36,794 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:43:36,794 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-12-21 21:43:36,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:43:36,795 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:36,795 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:37,008 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:43:37,009 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:37,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:37,010 INFO L82 PathProgramCache]: Analyzing trace with hash -846090056, now seen corresponding path program 6 times [2020-12-21 21:43:37,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:37,011 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721385308] [2020-12-21 21:43:37,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:37,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:37,093 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-21 21:43:37,094 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721385308] [2020-12-21 21:43:37,094 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119311344] [2020-12-21 21:43:37,094 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:37,240 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-21 21:43:37,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:37,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:43:37,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:37,296 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-21 21:43:37,297 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:37,297 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:43:37,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158222632] [2020-12-21 21:43:37,298 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:43:37,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:37,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:43:37,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:43:37,299 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 10 states. [2020-12-21 21:43:37,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:37,381 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-12-21 21:43:37,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:43:37,382 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2020-12-21 21:43:37,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:37,383 INFO L225 Difference]: With dead ends: 74 [2020-12-21 21:43:37,383 INFO L226 Difference]: Without dead ends: 60 [2020-12-21 21:43:37,383 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:43:37,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-21 21:43:37,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 25. [2020-12-21 21:43:37,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-21 21:43:37,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-12-21 21:43:37,389 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2020-12-21 21:43:37,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:37,390 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-12-21 21:43:37,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:43:37,390 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-12-21 21:43:37,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-21 21:43:37,391 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:37,391 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:37,605 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:37,606 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:37,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:37,607 INFO L82 PathProgramCache]: Analyzing trace with hash 401699895, now seen corresponding path program 7 times [2020-12-21 21:43:37,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:37,608 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295101428] [2020-12-21 21:43:37,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:37,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:37,745 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-21 21:43:37,746 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295101428] [2020-12-21 21:43:37,746 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610356601] [2020-12-21 21:43:37,746 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:37,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:37,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:43:37,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:37,868 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-21 21:43:37,868 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:37,868 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:43:37,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289926442] [2020-12-21 21:43:37,869 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:43:37,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:37,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:43:37,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:43:37,870 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 11 states. [2020-12-21 21:43:37,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:37,959 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-12-21 21:43:37,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:43:37,960 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2020-12-21 21:43:37,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:37,961 INFO L225 Difference]: With dead ends: 82 [2020-12-21 21:43:37,961 INFO L226 Difference]: Without dead ends: 67 [2020-12-21 21:43:37,961 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:43:37,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-21 21:43:37,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 27. [2020-12-21 21:43:37,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-21 21:43:37,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-12-21 21:43:37,966 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2020-12-21 21:43:37,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:37,967 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-12-21 21:43:37,967 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:43:37,967 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-12-21 21:43:37,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 21:43:37,968 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:37,968 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:38,182 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:38,183 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:38,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:38,184 INFO L82 PathProgramCache]: Analyzing trace with hash -88564904, now seen corresponding path program 8 times [2020-12-21 21:43:38,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:38,185 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780131091] [2020-12-21 21:43:38,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:38,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:38,295 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:43:38,295 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780131091] [2020-12-21 21:43:38,296 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355558922] [2020-12-21 21:43:38,296 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:38,365 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:43:38,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:38,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:43:38,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:38,418 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:43:38,419 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:38,419 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:43:38,419 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34046057] [2020-12-21 21:43:38,420 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:43:38,420 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:38,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:43:38,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:43:38,421 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2020-12-21 21:43:38,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:38,520 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-12-21 21:43:38,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:43:38,520 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-12-21 21:43:38,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:38,521 INFO L225 Difference]: With dead ends: 90 [2020-12-21 21:43:38,521 INFO L226 Difference]: Without dead ends: 74 [2020-12-21 21:43:38,522 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:43:38,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-12-21 21:43:38,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 29. [2020-12-21 21:43:38,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-21 21:43:38,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-12-21 21:43:38,527 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2020-12-21 21:43:38,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:38,527 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-12-21 21:43:38,527 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:43:38,528 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-12-21 21:43:38,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-21 21:43:38,528 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:38,528 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:38,741 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:43:38,742 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:38,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:38,743 INFO L82 PathProgramCache]: Analyzing trace with hash -1068424425, now seen corresponding path program 9 times [2020-12-21 21:43:38,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:38,744 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856223755] [2020-12-21 21:43:38,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:38,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:38,862 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:43:38,862 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856223755] [2020-12-21 21:43:38,862 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668004026] [2020-12-21 21:43:38,862 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:39,400 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-21 21:43:39,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:39,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:43:39,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:39,490 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:43:39,491 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:39,491 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 21:43:39,491 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965545558] [2020-12-21 21:43:39,493 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:43:39,493 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:39,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:43:39,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:43:39,494 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 13 states. [2020-12-21 21:43:39,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:39,599 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-12-21 21:43:39,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:43:39,599 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2020-12-21 21:43:39,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:39,602 INFO L225 Difference]: With dead ends: 98 [2020-12-21 21:43:39,602 INFO L226 Difference]: Without dead ends: 81 [2020-12-21 21:43:39,604 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:43:39,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-12-21 21:43:39,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 31. [2020-12-21 21:43:39,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-21 21:43:39,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-12-21 21:43:39,618 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2020-12-21 21:43:39,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:39,619 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-12-21 21:43:39,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:43:39,619 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-12-21 21:43:39,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-21 21:43:39,623 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:39,623 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:39,836 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:39,837 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:39,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:39,838 INFO L82 PathProgramCache]: Analyzing trace with hash 163360248, now seen corresponding path program 10 times [2020-12-21 21:43:39,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:39,838 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523526007] [2020-12-21 21:43:39,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:39,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:39,997 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-21 21:43:39,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523526007] [2020-12-21 21:43:39,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785056949] [2020-12-21 21:43:39,998 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:40,066 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:43:40,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:40,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:43:40,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:40,135 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-21 21:43:40,136 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:40,136 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 21:43:40,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690017894] [2020-12-21 21:43:40,137 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:43:40,137 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:40,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:43:40,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:43:40,139 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 14 states. [2020-12-21 21:43:40,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:40,239 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-12-21 21:43:40,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:43:40,241 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2020-12-21 21:43:40,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:40,242 INFO L225 Difference]: With dead ends: 106 [2020-12-21 21:43:40,242 INFO L226 Difference]: Without dead ends: 88 [2020-12-21 21:43:40,243 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:43:40,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-12-21 21:43:40,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 33. [2020-12-21 21:43:40,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-21 21:43:40,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-12-21 21:43:40,248 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2020-12-21 21:43:40,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:40,248 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-12-21 21:43:40,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:43:40,249 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-12-21 21:43:40,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-21 21:43:40,249 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:40,249 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:40,462 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:40,463 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:40,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:40,464 INFO L82 PathProgramCache]: Analyzing trace with hash 425322999, now seen corresponding path program 11 times [2020-12-21 21:43:40,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:40,465 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983110490] [2020-12-21 21:43:40,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:40,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:40,671 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-21 21:43:40,671 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983110490] [2020-12-21 21:43:40,671 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195815601] [2020-12-21 21:43:40,672 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:43,409 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2020-12-21 21:43:43,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:43,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:43:43,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:43,484 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-21 21:43:43,484 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:43,485 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:43:43,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006825857] [2020-12-21 21:43:43,485 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:43:43,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:43,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:43:43,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:43:43,487 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 15 states. [2020-12-21 21:43:43,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:43,600 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-12-21 21:43:43,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:43:43,601 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2020-12-21 21:43:43,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:43,602 INFO L225 Difference]: With dead ends: 114 [2020-12-21 21:43:43,602 INFO L226 Difference]: Without dead ends: 95 [2020-12-21 21:43:43,603 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:43:43,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-12-21 21:43:43,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 35. [2020-12-21 21:43:43,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-21 21:43:43,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-12-21 21:43:43,607 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2020-12-21 21:43:43,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:43,608 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-12-21 21:43:43,608 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:43:43,608 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-12-21 21:43:43,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-21 21:43:43,609 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:43,609 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:43,820 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:43:43,821 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:43,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:43,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1597249384, now seen corresponding path program 12 times [2020-12-21 21:43:43,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:43,822 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [982661990] [2020-12-21 21:43:43,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:43,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:43,988 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-21 21:43:43,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [982661990] [2020-12-21 21:43:43,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784631986] [2020-12-21 21:43:43,989 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:45,351 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:43:45,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:45,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 21:43:45,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:45,427 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-21 21:43:45,427 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:45,427 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-21 21:43:45,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435994790] [2020-12-21 21:43:45,428 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:43:45,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:45,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:43:45,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:43:45,429 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 16 states. [2020-12-21 21:43:45,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:45,544 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-12-21 21:43:45,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:43:45,544 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2020-12-21 21:43:45,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:45,545 INFO L225 Difference]: With dead ends: 122 [2020-12-21 21:43:45,545 INFO L226 Difference]: Without dead ends: 102 [2020-12-21 21:43:45,546 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:43:45,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-12-21 21:43:45,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 37. [2020-12-21 21:43:45,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-21 21:43:45,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-12-21 21:43:45,551 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 33 [2020-12-21 21:43:45,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:45,551 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-12-21 21:43:45,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:43:45,552 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-12-21 21:43:45,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-21 21:43:45,552 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:45,553 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:45,767 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:43:45,768 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:45,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:45,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1878902999, now seen corresponding path program 13 times [2020-12-21 21:43:45,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:45,770 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915460901] [2020-12-21 21:43:45,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:45,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:46,010 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-21 21:43:46,011 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915460901] [2020-12-21 21:43:46,011 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [298691915] [2020-12-21 21:43:46,011 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:46,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:46,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:43:46,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:46,150 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-21 21:43:46,150 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:46,150 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:43:46,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688647632] [2020-12-21 21:43:46,151 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:43:46,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:46,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:43:46,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:43:46,152 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 17 states. [2020-12-21 21:43:46,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:46,278 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-12-21 21:43:46,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:43:46,279 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2020-12-21 21:43:46,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:46,280 INFO L225 Difference]: With dead ends: 130 [2020-12-21 21:43:46,280 INFO L226 Difference]: Without dead ends: 109 [2020-12-21 21:43:46,281 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:43:46,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-12-21 21:43:46,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 39. [2020-12-21 21:43:46,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-21 21:43:46,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-12-21 21:43:46,286 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2020-12-21 21:43:46,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:46,286 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-12-21 21:43:46,286 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:43:46,287 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-12-21 21:43:46,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-21 21:43:46,287 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:46,287 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:46,491 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:43:46,492 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:46,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:46,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1720994616, now seen corresponding path program 14 times [2020-12-21 21:43:46,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:46,494 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833288071] [2020-12-21 21:43:46,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:46,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:46,681 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-21 21:43:46,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833288071] [2020-12-21 21:43:46,682 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511468278] [2020-12-21 21:43:46,682 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:46,751 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:43:46,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:46,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:43:46,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:46,836 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-21 21:43:46,836 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:46,836 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:43:46,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876811485] [2020-12-21 21:43:46,837 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:43:46,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:46,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:43:46,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:43:46,840 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 18 states. [2020-12-21 21:43:46,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:46,988 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-12-21 21:43:46,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:43:46,989 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2020-12-21 21:43:46,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:46,990 INFO L225 Difference]: With dead ends: 138 [2020-12-21 21:43:46,990 INFO L226 Difference]: Without dead ends: 116 [2020-12-21 21:43:46,991 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:43:46,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-12-21 21:43:46,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 41. [2020-12-21 21:43:46,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-21 21:43:46,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-12-21 21:43:46,996 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2020-12-21 21:43:46,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:46,996 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-12-21 21:43:46,996 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:43:46,996 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-12-21 21:43:46,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-21 21:43:46,997 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:46,997 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:47,210 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:47,211 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:47,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:47,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1890500535, now seen corresponding path program 15 times [2020-12-21 21:43:47,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:47,212 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226131324] [2020-12-21 21:43:47,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:47,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:47,427 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-21 21:43:47,428 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226131324] [2020-12-21 21:43:47,428 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519587323] [2020-12-21 21:43:47,428 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:50,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-21 21:43:50,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:50,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 21:43:50,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:50,808 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-21 21:43:50,809 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:50,809 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 21:43:50,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802134140] [2020-12-21 21:43:50,810 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:43:50,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:50,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:43:50,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:43:50,811 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 19 states. [2020-12-21 21:43:50,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:50,951 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-12-21 21:43:50,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:43:50,952 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2020-12-21 21:43:50,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:50,953 INFO L225 Difference]: With dead ends: 146 [2020-12-21 21:43:50,953 INFO L226 Difference]: Without dead ends: 123 [2020-12-21 21:43:50,954 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:43:50,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-12-21 21:43:50,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 43. [2020-12-21 21:43:50,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-21 21:43:50,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2020-12-21 21:43:50,959 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 39 [2020-12-21 21:43:50,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:50,959 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2020-12-21 21:43:50,959 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:43:50,959 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2020-12-21 21:43:50,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:43:50,960 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:50,960 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:51,174 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:43:51,175 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:51,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:51,176 INFO L82 PathProgramCache]: Analyzing trace with hash -498870824, now seen corresponding path program 16 times [2020-12-21 21:43:51,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:51,177 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492366823] [2020-12-21 21:43:51,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:51,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:51,447 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-12-21 21:43:51,448 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492366823] [2020-12-21 21:43:51,448 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303457080] [2020-12-21 21:43:51,448 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:43:51,531 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:43:51,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:43:51,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:43:51,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:43:51,600 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-12-21 21:43:51,600 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:43:51,600 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 21:43:51,600 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707973158] [2020-12-21 21:43:51,601 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:43:51,601 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:43:51,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:43:51,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:43:51,602 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 20 states. [2020-12-21 21:43:51,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:43:51,750 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-12-21 21:43:51,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:43:51,750 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2020-12-21 21:43:51,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:43:51,751 INFO L225 Difference]: With dead ends: 154 [2020-12-21 21:43:51,752 INFO L226 Difference]: Without dead ends: 130 [2020-12-21 21:43:51,752 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:43:51,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-12-21 21:43:51,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 45. [2020-12-21 21:43:51,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-21 21:43:51,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2020-12-21 21:43:51,757 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2020-12-21 21:43:51,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:43:51,758 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2020-12-21 21:43:51,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:43:51,758 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2020-12-21 21:43:51,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-12-21 21:43:51,759 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:43:51,759 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:43:51,973 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:43:51,974 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:43:51,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:43:51,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1197395607, now seen corresponding path program 17 times [2020-12-21 21:43:51,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:43:51,975 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265731389] [2020-12-21 21:43:51,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:43:51,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:43:52,246 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-21 21:43:52,246 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265731389] [2020-12-21 21:43:52,246 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735175963] [2020-12-21 21:43:52,246 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:44:37,038 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2020-12-21 21:44:37,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:44:37,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 21:44:37,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:44:37,185 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-21 21:44:37,186 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:44:37,186 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-21 21:44:37,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148877076] [2020-12-21 21:44:37,187 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:44:37,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:44:37,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:44:37,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:44:37,188 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 21 states. [2020-12-21 21:44:37,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:44:37,340 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-12-21 21:44:37,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:44:37,341 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-12-21 21:44:37,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:44:37,343 INFO L225 Difference]: With dead ends: 162 [2020-12-21 21:44:37,343 INFO L226 Difference]: Without dead ends: 137 [2020-12-21 21:44:37,344 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:44:37,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2020-12-21 21:44:37,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 47. [2020-12-21 21:44:37,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-12-21 21:44:37,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2020-12-21 21:44:37,349 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2020-12-21 21:44:37,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:44:37,350 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2020-12-21 21:44:37,350 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:44:37,350 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2020-12-21 21:44:37,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 21:44:37,351 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:44:37,351 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:44:37,565 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 21:44:37,566 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:44:37,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:44:37,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1535674488, now seen corresponding path program 18 times [2020-12-21 21:44:37,567 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:44:37,567 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624826515] [2020-12-21 21:44:37,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:44:37,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:44:37,841 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-21 21:44:37,841 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624826515] [2020-12-21 21:44:37,842 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346081919] [2020-12-21 21:44:37,842 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:44:43,943 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2020-12-21 21:44:43,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:44:43,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-21 21:44:43,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:44:44,046 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-21 21:44:44,046 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:44:44,047 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-21 21:44:44,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392153690] [2020-12-21 21:44:44,047 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-21 21:44:44,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:44:44,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-21 21:44:44,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 21:44:44,049 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 22 states. [2020-12-21 21:44:44,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:44:44,221 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-12-21 21:44:44,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 21:44:44,222 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 45 [2020-12-21 21:44:44,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:44:44,223 INFO L225 Difference]: With dead ends: 170 [2020-12-21 21:44:44,223 INFO L226 Difference]: Without dead ends: 144 [2020-12-21 21:44:44,224 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 21:44:44,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-12-21 21:44:44,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 49. [2020-12-21 21:44:44,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-21 21:44:44,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2020-12-21 21:44:44,229 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 45 [2020-12-21 21:44:44,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:44:44,229 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2020-12-21 21:44:44,229 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-21 21:44:44,229 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2020-12-21 21:44:44,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-21 21:44:44,230 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:44:44,230 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:44:44,444 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:44:44,445 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:44:44,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:44:44,446 INFO L82 PathProgramCache]: Analyzing trace with hash -1082133129, now seen corresponding path program 19 times [2020-12-21 21:44:44,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:44:44,446 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [581937069] [2020-12-21 21:44:44,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:44:44,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:44:44,781 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-12-21 21:44:44,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [581937069] [2020-12-21 21:44:44,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289035186] [2020-12-21 21:44:44,782 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:44:44,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:44:44,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-21 21:44:44,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:44:44,964 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-12-21 21:44:44,965 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:44:44,965 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-21 21:44:44,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462428902] [2020-12-21 21:44:44,967 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-21 21:44:44,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:44:44,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-21 21:44:44,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:44:44,969 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 23 states. [2020-12-21 21:44:45,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:44:45,143 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-12-21 21:44:45,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-21 21:44:45,144 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 47 [2020-12-21 21:44:45,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:44:45,147 INFO L225 Difference]: With dead ends: 178 [2020-12-21 21:44:45,147 INFO L226 Difference]: Without dead ends: 151 [2020-12-21 21:44:45,148 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:44:45,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-12-21 21:44:45,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 51. [2020-12-21 21:44:45,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-12-21 21:44:45,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2020-12-21 21:44:45,161 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2020-12-21 21:44:45,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:44:45,161 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2020-12-21 21:44:45,161 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-21 21:44:45,161 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2020-12-21 21:44:45,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:44:45,162 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:44:45,162 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:44:45,377 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:44:45,378 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:44:45,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:44:45,379 INFO L82 PathProgramCache]: Analyzing trace with hash -1164942568, now seen corresponding path program 20 times [2020-12-21 21:44:45,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:44:45,379 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856408956] [2020-12-21 21:44:45,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:44:45,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:44:45,759 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-21 21:44:45,759 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856408956] [2020-12-21 21:44:45,759 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105844028] [2020-12-21 21:44:45,759 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:44:45,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:44:45,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:44:45,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-21 21:44:45,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:44:45,935 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-21 21:44:45,936 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:44:45,936 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-21 21:44:45,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033472897] [2020-12-21 21:44:45,937 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-21 21:44:45,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:44:45,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-21 21:44:45,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:44:45,938 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 24 states. [2020-12-21 21:44:46,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:44:46,129 INFO L93 Difference]: Finished difference Result 186 states and 191 transitions. [2020-12-21 21:44:46,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-21 21:44:46,130 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2020-12-21 21:44:46,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:44:46,131 INFO L225 Difference]: With dead ends: 186 [2020-12-21 21:44:46,132 INFO L226 Difference]: Without dead ends: 158 [2020-12-21 21:44:46,133 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:44:46,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2020-12-21 21:44:46,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 53. [2020-12-21 21:44:46,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-21 21:44:46,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2020-12-21 21:44:46,139 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2020-12-21 21:44:46,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:44:46,140 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2020-12-21 21:44:46,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-21 21:44:46,140 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2020-12-21 21:44:46,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-21 21:44:46,141 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:44:46,141 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:44:46,355 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-21 21:44:46,356 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:44:46,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:44:46,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1677997143, now seen corresponding path program 21 times [2020-12-21 21:44:46,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:44:46,357 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353575868] [2020-12-21 21:44:46,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:44:46,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:44:46,731 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-21 21:44:46,731 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353575868] [2020-12-21 21:44:46,732 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956475069] [2020-12-21 21:44:46,732 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:45:10,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-21 21:45:10,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:45:11,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-21 21:45:11,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:45:11,105 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-21 21:45:11,106 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:45:11,106 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-21 21:45:11,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850171283] [2020-12-21 21:45:11,107 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-21 21:45:11,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:45:11,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-21 21:45:11,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:45:11,108 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 25 states. [2020-12-21 21:45:11,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:45:11,300 INFO L93 Difference]: Finished difference Result 194 states and 199 transitions. [2020-12-21 21:45:11,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-21 21:45:11,303 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 51 [2020-12-21 21:45:11,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:45:11,304 INFO L225 Difference]: With dead ends: 194 [2020-12-21 21:45:11,304 INFO L226 Difference]: Without dead ends: 165 [2020-12-21 21:45:11,304 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:45:11,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-12-21 21:45:11,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 55. [2020-12-21 21:45:11,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-12-21 21:45:11,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-12-21 21:45:11,309 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2020-12-21 21:45:11,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:45:11,309 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-12-21 21:45:11,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-21 21:45:11,309 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-12-21 21:45:11,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-21 21:45:11,310 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:45:11,310 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:45:11,510 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-21 21:45:11,511 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:45:11,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:45:11,512 INFO L82 PathProgramCache]: Analyzing trace with hash 1745446328, now seen corresponding path program 22 times [2020-12-21 21:45:11,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:45:11,512 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634214559] [2020-12-21 21:45:11,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:45:11,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:45:11,967 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-12-21 21:45:11,967 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634214559] [2020-12-21 21:45:11,968 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815321609] [2020-12-21 21:45:11,968 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:45:12,057 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:45:12,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:45:12,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-21 21:45:12,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:45:12,139 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-12-21 21:45:12,139 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:45:12,139 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-21 21:45:12,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249994042] [2020-12-21 21:45:12,141 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-21 21:45:12,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:45:12,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-21 21:45:12,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-21 21:45:12,143 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 26 states. [2020-12-21 21:45:12,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:45:12,355 INFO L93 Difference]: Finished difference Result 202 states and 207 transitions. [2020-12-21 21:45:12,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-21 21:45:12,356 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 53 [2020-12-21 21:45:12,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:45:12,357 INFO L225 Difference]: With dead ends: 202 [2020-12-21 21:45:12,357 INFO L226 Difference]: Without dead ends: 172 [2020-12-21 21:45:12,358 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-21 21:45:12,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2020-12-21 21:45:12,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 57. [2020-12-21 21:45:12,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-21 21:45:12,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-12-21 21:45:12,362 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 53 [2020-12-21 21:45:12,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:45:12,363 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-12-21 21:45:12,363 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-21 21:45:12,363 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-12-21 21:45:12,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-21 21:45:12,364 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:45:12,364 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:45:12,577 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:45:12,578 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:45:12,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:45:12,578 INFO L82 PathProgramCache]: Analyzing trace with hash -1621259465, now seen corresponding path program 23 times [2020-12-21 21:45:12,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:45:12,579 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764497110] [2020-12-21 21:45:12,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:45:12,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:45:12,988 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2020-12-21 21:45:12,988 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764497110] [2020-12-21 21:45:12,988 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86428480] [2020-12-21 21:45:12,989 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true