/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_copyInitSum_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:29:10,831 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:29:10,837 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:29:10,898 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:29:10,899 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:29:10,904 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:29:10,908 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:29:10,917 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:29:10,920 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:29:10,927 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:29:10,929 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:29:10,931 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-12-21 21:29:11,012 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:29:11,068 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:29:11,068 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:29:11,073 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:29:11,074 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:29:11,074 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:29:11,074 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:29:11,075 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:29:11,075 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:29:11,075 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:29:11,076 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:29:11,077 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:29:11,077 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:29:11,077 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:29:11,077 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:29:11,078 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:29:11,078 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:29:11,078 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:29:11,078 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:29:11,079 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:29:11,079 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:29:11,079 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:29:11,080 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:29:11,080 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:29:11,080 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:29:11,080 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:29:11,080 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:29:11,500 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:29:11,544 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:29:11,549 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:29:11,550 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:29:11,551 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:29:11,552 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copyInitSum_ground.i [2020-12-21 21:29:11,646 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d5bfb42ed/9d8ec50682334cbf80f7b17ace4f33d3/FLAGe89cce0c8 [2020-12-21 21:29:12,405 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:29:12,406 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copyInitSum_ground.i [2020-12-21 21:29:12,414 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d5bfb42ed/9d8ec50682334cbf80f7b17ace4f33d3/FLAGe89cce0c8 [2020-12-21 21:29:12,724 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d5bfb42ed/9d8ec50682334cbf80f7b17ace4f33d3 [2020-12-21 21:29:12,728 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:29:12,730 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:29:12,733 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:29:12,734 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:29:12,740 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:29:12,742 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:29:12" (1/1) ... [2020-12-21 21:29:12,744 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c845e5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:12, skipping insertion in model container [2020-12-21 21:29:12,744 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:29:12" (1/1) ... [2020-12-21 21:29:12,755 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:29:12,784 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:29:12,990 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_copyInitSum_ground.i[860,873] [2020-12-21 21:29:13,007 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:29:13,017 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:29:13,035 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_copyInitSum_ground.i[860,873] [2020-12-21 21:29:13,046 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:29:13,062 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:29:13,062 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13 WrapperNode [2020-12-21 21:29:13,063 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:29:13,064 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:29:13,064 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:29:13,064 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:29:13,073 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (1/1) ... [2020-12-21 21:29:13,081 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (1/1) ... [2020-12-21 21:29:13,103 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:29:13,104 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:29:13,105 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:29:13,105 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:29:13,115 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (1/1) ... [2020-12-21 21:29:13,116 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (1/1) ... [2020-12-21 21:29:13,118 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (1/1) ... [2020-12-21 21:29:13,118 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (1/1) ... [2020-12-21 21:29:13,125 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (1/1) ... [2020-12-21 21:29:13,130 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (1/1) ... [2020-12-21 21:29:13,132 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (1/1) ... [2020-12-21 21:29:13,134 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:29:13,135 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:29:13,135 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:29:13,135 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:29:13,136 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (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 21:29:13,229 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:29:13,229 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:29:13,229 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:29:13,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:29:13,229 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:29:13,230 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:29:13,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:29:13,608 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:29:13,608 INFO L299 CfgBuilder]: Removed 10 assume(true) statements. [2020-12-21 21:29:13,610 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:29:13 BoogieIcfgContainer [2020-12-21 21:29:13,610 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:29:13,618 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:29:13,618 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:29:13,622 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:29:13,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:29:12" (1/3) ... [2020-12-21 21:29:13,623 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79620b8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:29:13, skipping insertion in model container [2020-12-21 21:29:13,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:13" (2/3) ... [2020-12-21 21:29:13,624 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79620b8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:29:13, skipping insertion in model container [2020-12-21 21:29:13,624 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:29:13" (3/3) ... [2020-12-21 21:29:13,625 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copyInitSum_ground.i [2020-12-21 21:29:13,654 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:29:13,663 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:29:13,709 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:29:13,758 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:29:13,758 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:29:13,758 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:29:13,758 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:29:13,758 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:29:13,758 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:29:13,759 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:29:13,759 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:29:13,779 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-12-21 21:29:13,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-21 21:29:13,785 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:13,786 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:13,786 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:13,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:13,793 INFO L82 PathProgramCache]: Analyzing trace with hash -952172836, now seen corresponding path program 1 times [2020-12-21 21:29:13,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:13,807 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955377150] [2020-12-21 21:29:13,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:13,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:14,013 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 21:29:14,014 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955377150] [2020-12-21 21:29:14,015 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:29:14,016 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:29:14,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673698600] [2020-12-21 21:29:14,022 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:29:14,023 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:14,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:29:14,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:29:14,043 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2020-12-21 21:29:14,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:14,113 INFO L93 Difference]: Finished difference Result 42 states and 62 transitions. [2020-12-21 21:29:14,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:29:14,116 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-12-21 21:29:14,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:14,127 INFO L225 Difference]: With dead ends: 42 [2020-12-21 21:29:14,127 INFO L226 Difference]: Without dead ends: 21 [2020-12-21 21:29:14,131 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 21:29:14,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-21 21:29:14,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2020-12-21 21:29:14,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-21 21:29:14,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-12-21 21:29:14,170 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 11 [2020-12-21 21:29:14,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:14,171 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-12-21 21:29:14,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:29:14,171 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-12-21 21:29:14,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-21 21:29:14,172 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:14,172 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:14,172 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:29:14,173 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:14,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:14,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1567052653, now seen corresponding path program 1 times [2020-12-21 21:29:14,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:14,175 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510820329] [2020-12-21 21:29:14,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:14,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:14,234 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-21 21:29:14,235 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [510820329] [2020-12-21 21:29:14,235 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791688415] [2020-12-21 21:29:14,235 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 21:29:14,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:14,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:29:14,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:14,419 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-21 21:29:14,420 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:14,420 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:29:14,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442820888] [2020-12-21 21:29:14,423 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:29:14,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:14,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:29:14,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:29:14,438 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 5 states. [2020-12-21 21:29:14,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:14,559 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2020-12-21 21:29:14,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:29:14,560 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-12-21 21:29:14,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:14,562 INFO L225 Difference]: With dead ends: 41 [2020-12-21 21:29:14,562 INFO L226 Difference]: Without dead ends: 26 [2020-12-21 21:29:14,563 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 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 21:29:14,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-21 21:29:14,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-12-21 21:29:14,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:29:14,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2020-12-21 21:29:14,575 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 16 [2020-12-21 21:29:14,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:14,576 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2020-12-21 21:29:14,576 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:29:14,576 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2020-12-21 21:29:14,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:29:14,579 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:14,579 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:14,792 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:29:14,793 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:14,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:14,795 INFO L82 PathProgramCache]: Analyzing trace with hash 159288628, now seen corresponding path program 2 times [2020-12-21 21:29:14,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:14,796 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110959733] [2020-12-21 21:29:14,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:14,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:14,941 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-21 21:29:14,942 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110959733] [2020-12-21 21:29:14,942 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914071799] [2020-12-21 21:29:14,943 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 21:29:15,029 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:15,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:15,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:29:15,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:15,069 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-21 21:29:15,069 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:15,070 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:29:15,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528292369] [2020-12-21 21:29:15,071 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:29:15,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:15,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:29:15,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:29:15,072 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 6 states. [2020-12-21 21:29:15,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:15,130 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-12-21 21:29:15,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:29:15,131 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-12-21 21:29:15,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:15,132 INFO L225 Difference]: With dead ends: 50 [2020-12-21 21:29:15,132 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 21:29:15,133 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 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 21:29:15,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 21:29:15,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-12-21 21:29:15,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-21 21:29:15,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-12-21 21:29:15,140 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-12-21 21:29:15,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:15,140 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-12-21 21:29:15,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:29:15,140 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-12-21 21:29:15,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-21 21:29:15,141 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:15,142 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:15,357 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:15,358 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:15,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:15,360 INFO L82 PathProgramCache]: Analyzing trace with hash 2098372907, now seen corresponding path program 3 times [2020-12-21 21:29:15,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:15,361 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009915442] [2020-12-21 21:29:15,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:15,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:15,474 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-21 21:29:15,475 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009915442] [2020-12-21 21:29:15,476 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078437909] [2020-12-21 21:29:15,476 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 21:29:15,533 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:29:15,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:15,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:29:15,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:15,648 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-21 21:29:15,649 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:15,649 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:29:15,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597746628] [2020-12-21 21:29:15,650 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:29:15,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:15,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:29:15,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:29:15,653 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 7 states. [2020-12-21 21:29:15,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:15,735 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2020-12-21 21:29:15,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:29:15,736 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2020-12-21 21:29:15,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:15,737 INFO L225 Difference]: With dead ends: 59 [2020-12-21 21:29:15,737 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 21:29:15,738 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 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 21:29:15,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 21:29:15,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-12-21 21:29:15,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-21 21:29:15,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2020-12-21 21:29:15,744 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2020-12-21 21:29:15,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:15,745 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2020-12-21 21:29:15,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:29:15,745 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2020-12-21 21:29:15,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-21 21:29:15,746 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:15,746 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:15,961 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:15,962 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:15,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:15,963 INFO L82 PathProgramCache]: Analyzing trace with hash -1609282676, now seen corresponding path program 4 times [2020-12-21 21:29:15,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:15,964 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496740234] [2020-12-21 21:29:15,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:16,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:16,107 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-12-21 21:29:16,108 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496740234] [2020-12-21 21:29:16,108 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283905682] [2020-12-21 21:29:16,108 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 21:29:16,161 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:16,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:16,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:29:16,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:16,215 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-12-21 21:29:16,216 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:16,216 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:29:16,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738086116] [2020-12-21 21:29:16,217 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:29:16,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:16,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:29:16,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:29:16,219 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 8 states. [2020-12-21 21:29:16,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:16,292 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2020-12-21 21:29:16,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:29:16,293 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-12-21 21:29:16,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:16,294 INFO L225 Difference]: With dead ends: 68 [2020-12-21 21:29:16,294 INFO L226 Difference]: Without dead ends: 41 [2020-12-21 21:29:16,295 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:29:16,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-21 21:29:16,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2020-12-21 21:29:16,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-21 21:29:16,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2020-12-21 21:29:16,302 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 31 [2020-12-21 21:29:16,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:16,302 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2020-12-21 21:29:16,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:29:16,302 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2020-12-21 21:29:16,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-21 21:29:16,303 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:16,304 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:16,515 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:16,516 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:16,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:16,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1784739267, now seen corresponding path program 5 times [2020-12-21 21:29:16,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:16,519 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281986339] [2020-12-21 21:29:16,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:16,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:16,615 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-12-21 21:29:16,617 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281986339] [2020-12-21 21:29:16,617 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146555168] [2020-12-21 21:29:16,617 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 21:29:16,989 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-21 21:29:16,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:16,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:29:16,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:17,095 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-12-21 21:29:17,096 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:17,096 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 21:29:17,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687370963] [2020-12-21 21:29:17,097 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:29:17,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:17,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:29:17,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:29:17,098 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 9 states. [2020-12-21 21:29:17,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:17,239 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2020-12-21 21:29:17,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 21:29:17,241 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-12-21 21:29:17,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:17,242 INFO L225 Difference]: With dead ends: 77 [2020-12-21 21:29:17,242 INFO L226 Difference]: Without dead ends: 46 [2020-12-21 21:29:17,243 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 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 21:29:17,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-21 21:29:17,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-12-21 21:29:17,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-21 21:29:17,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2020-12-21 21:29:17,269 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 36 [2020-12-21 21:29:17,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:17,269 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2020-12-21 21:29:17,269 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:29:17,269 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2020-12-21 21:29:17,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:29:17,272 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:17,272 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:17,488 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:29:17,489 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:17,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:17,490 INFO L82 PathProgramCache]: Analyzing trace with hash 2008431076, now seen corresponding path program 6 times [2020-12-21 21:29:17,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:17,491 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816306660] [2020-12-21 21:29:17,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:17,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:17,585 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-12-21 21:29:17,586 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816306660] [2020-12-21 21:29:17,586 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502603665] [2020-12-21 21:29:17,586 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 21:29:17,869 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:29:17,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:17,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:29:17,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:17,951 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-12-21 21:29:17,952 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:17,952 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:29:17,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987943690] [2020-12-21 21:29:17,953 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:29:17,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:17,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:29:17,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:29:17,954 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 10 states. [2020-12-21 21:29:18,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:18,045 INFO L93 Difference]: Finished difference Result 86 states and 94 transitions. [2020-12-21 21:29:18,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:29:18,045 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 41 [2020-12-21 21:29:18,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:18,046 INFO L225 Difference]: With dead ends: 86 [2020-12-21 21:29:18,046 INFO L226 Difference]: Without dead ends: 51 [2020-12-21 21:29:18,047 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 41 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 21:29:18,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-21 21:29:18,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2020-12-21 21:29:18,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-21 21:29:18,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-12-21 21:29:18,054 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 41 [2020-12-21 21:29:18,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:18,055 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-12-21 21:29:18,055 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:29:18,055 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-12-21 21:29:18,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-12-21 21:29:18,056 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:18,057 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:18,271 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:18,272 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:18,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:18,273 INFO L82 PathProgramCache]: Analyzing trace with hash -700601765, now seen corresponding path program 7 times [2020-12-21 21:29:18,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:18,274 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275839196] [2020-12-21 21:29:18,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:18,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:18,454 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2020-12-21 21:29:18,455 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275839196] [2020-12-21 21:29:18,455 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335193695] [2020-12-21 21:29:18,456 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 21:29:18,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:18,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:29:18,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:18,597 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2020-12-21 21:29:18,598 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:18,598 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:29:18,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286733711] [2020-12-21 21:29:18,599 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:29:18,599 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:18,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:29:18,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:29:18,600 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 11 states. [2020-12-21 21:29:18,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:18,703 INFO L93 Difference]: Finished difference Result 95 states and 103 transitions. [2020-12-21 21:29:18,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:29:18,704 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 46 [2020-12-21 21:29:18,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:18,705 INFO L225 Difference]: With dead ends: 95 [2020-12-21 21:29:18,705 INFO L226 Difference]: Without dead ends: 56 [2020-12-21 21:29:18,706 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 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 21:29:18,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-21 21:29:18,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2020-12-21 21:29:18,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-21 21:29:18,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2020-12-21 21:29:18,724 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 46 [2020-12-21 21:29:18,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:18,727 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2020-12-21 21:29:18,727 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:29:18,728 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2020-12-21 21:29:18,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-21 21:29:18,729 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:18,729 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:18,942 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:18,943 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:18,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:18,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1469732924, now seen corresponding path program 8 times [2020-12-21 21:29:18,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:18,945 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091789206] [2020-12-21 21:29:18,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:18,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:19,059 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-12-21 21:29:19,060 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091789206] [2020-12-21 21:29:19,060 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113164467] [2020-12-21 21:29:19,060 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 21:29:19,141 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:19,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:19,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:29:19,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:19,252 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-12-21 21:29:19,253 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:19,253 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:29:19,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322943133] [2020-12-21 21:29:19,259 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:29:19,259 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:19,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:29:19,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:29:19,260 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 12 states. [2020-12-21 21:29:19,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:19,391 INFO L93 Difference]: Finished difference Result 104 states and 112 transitions. [2020-12-21 21:29:19,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:29:19,391 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 51 [2020-12-21 21:29:19,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:19,397 INFO L225 Difference]: With dead ends: 104 [2020-12-21 21:29:19,397 INFO L226 Difference]: Without dead ends: 61 [2020-12-21 21:29:19,399 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 51 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 21:29:19,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-12-21 21:29:19,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2020-12-21 21:29:19,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-12-21 21:29:19,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-12-21 21:29:19,417 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 51 [2020-12-21 21:29:19,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:19,418 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-12-21 21:29:19,418 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:29:19,418 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-12-21 21:29:19,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-12-21 21:29:19,419 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:19,419 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:19,634 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:29:19,635 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:19,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:19,635 INFO L82 PathProgramCache]: Analyzing trace with hash 300072691, now seen corresponding path program 9 times [2020-12-21 21:29:19,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:19,636 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239015767] [2020-12-21 21:29:19,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:19,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:19,795 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2020-12-21 21:29:19,796 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239015767] [2020-12-21 21:29:19,796 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270824421] [2020-12-21 21:29:19,796 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 21:29:20,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-21 21:29:20,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:20,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:29:20,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:20,358 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2020-12-21 21:29:20,358 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:20,358 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 21:29:20,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429133692] [2020-12-21 21:29:20,360 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:29:20,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:20,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:29:20,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:29:20,368 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 13 states. [2020-12-21 21:29:20,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:20,514 INFO L93 Difference]: Finished difference Result 113 states and 121 transitions. [2020-12-21 21:29:20,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:29:20,515 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2020-12-21 21:29:20,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:20,516 INFO L225 Difference]: With dead ends: 113 [2020-12-21 21:29:20,516 INFO L226 Difference]: Without dead ends: 66 [2020-12-21 21:29:20,517 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 56 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 21:29:20,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-21 21:29:20,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2020-12-21 21:29:20,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-21 21:29:20,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2020-12-21 21:29:20,524 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 56 [2020-12-21 21:29:20,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:20,524 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2020-12-21 21:29:20,524 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:29:20,524 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2020-12-21 21:29:20,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:29:20,525 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:20,525 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:20,739 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:20,740 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:20,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:20,741 INFO L82 PathProgramCache]: Analyzing trace with hash -1049188716, now seen corresponding path program 10 times [2020-12-21 21:29:20,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:20,742 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769935691] [2020-12-21 21:29:20,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:20,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:20,887 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2020-12-21 21:29:20,888 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769935691] [2020-12-21 21:29:20,888 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714093918] [2020-12-21 21:29:20,888 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 21:29:20,963 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:20,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:20,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:29:20,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:21,042 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-12-21 21:29:21,043 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:21,043 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 21:29:21,043 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309241041] [2020-12-21 21:29:21,044 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:29:21,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:21,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:29:21,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:29:21,045 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand 14 states. [2020-12-21 21:29:21,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:21,173 INFO L93 Difference]: Finished difference Result 122 states and 130 transitions. [2020-12-21 21:29:21,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:29:21,173 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 61 [2020-12-21 21:29:21,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:21,174 INFO L225 Difference]: With dead ends: 122 [2020-12-21 21:29:21,174 INFO L226 Difference]: Without dead ends: 71 [2020-12-21 21:29:21,175 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 61 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 21:29:21,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-12-21 21:29:21,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2020-12-21 21:29:21,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-12-21 21:29:21,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-12-21 21:29:21,182 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 61 [2020-12-21 21:29:21,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:21,182 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-12-21 21:29:21,183 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:29:21,183 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-12-21 21:29:21,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-21 21:29:21,184 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:21,184 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:21,393 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:21,394 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:21,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:21,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1946825611, now seen corresponding path program 11 times [2020-12-21 21:29:21,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:21,396 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421362839] [2020-12-21 21:29:21,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:21,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:21,593 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2020-12-21 21:29:21,593 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421362839] [2020-12-21 21:29:21,593 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373195252] [2020-12-21 21:29:21,593 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 21:30:07,936 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-21 21:30:07,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:07,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:30:07,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:08,124 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-12-21 21:30:08,125 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:08,125 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:30:08,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380722903] [2020-12-21 21:30:08,126 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:30:08,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:08,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:30:08,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:30:08,128 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 15 states. [2020-12-21 21:30:08,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:08,266 INFO L93 Difference]: Finished difference Result 131 states and 139 transitions. [2020-12-21 21:30:08,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:30:08,267 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 66 [2020-12-21 21:30:08,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:08,268 INFO L225 Difference]: With dead ends: 131 [2020-12-21 21:30:08,268 INFO L226 Difference]: Without dead ends: 76 [2020-12-21 21:30:08,270 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 66 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 21:30:08,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-21 21:30:08,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2020-12-21 21:30:08,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-12-21 21:30:08,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2020-12-21 21:30:08,279 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 66 [2020-12-21 21:30:08,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:08,280 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2020-12-21 21:30:08,280 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:30:08,280 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2020-12-21 21:30:08,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-12-21 21:30:08,281 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:08,281 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:08,482 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:30:08,482 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:08,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:08,483 INFO L82 PathProgramCache]: Analyzing trace with hash -780065556, now seen corresponding path program 12 times [2020-12-21 21:30:08,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:08,484 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559134956] [2020-12-21 21:30:08,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:08,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:08,658 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2020-12-21 21:30:08,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559134956] [2020-12-21 21:30:08,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166088748] [2020-12-21 21:30:08,660 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 21:30:18,538 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 21:30:18,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:18,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-21 21:30:18,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:18,672 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-12-21 21:30:18,672 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:18,672 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-21 21:30:18,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024492039] [2020-12-21 21:30:18,673 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:30:18,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:18,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:30:18,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:30:18,674 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand 16 states. [2020-12-21 21:30:18,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:18,832 INFO L93 Difference]: Finished difference Result 140 states and 148 transitions. [2020-12-21 21:30:18,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:30:18,832 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 71 [2020-12-21 21:30:18,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:18,833 INFO L225 Difference]: With dead ends: 140 [2020-12-21 21:30:18,833 INFO L226 Difference]: Without dead ends: 81 [2020-12-21 21:30:18,834 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 71 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 21:30:18,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-12-21 21:30:18,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2020-12-21 21:30:18,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-12-21 21:30:18,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-12-21 21:30:18,841 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 71 [2020-12-21 21:30:18,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:18,841 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-12-21 21:30:18,841 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:30:18,841 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-12-21 21:30:18,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-12-21 21:30:18,842 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:18,842 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:19,047 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:30:19,048 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:19,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:19,049 INFO L82 PathProgramCache]: Analyzing trace with hash 2028865571, now seen corresponding path program 13 times [2020-12-21 21:30:19,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:19,049 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146081631] [2020-12-21 21:30:19,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:19,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:19,244 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2020-12-21 21:30:19,245 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146081631] [2020-12-21 21:30:19,245 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246540844] [2020-12-21 21:30:19,245 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 21:30:19,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:19,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:30:19,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:19,413 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2020-12-21 21:30:19,414 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:19,414 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:30:19,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65606839] [2020-12-21 21:30:19,415 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:30:19,415 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:19,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:30:19,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:30:19,416 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 17 states. [2020-12-21 21:30:19,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:19,615 INFO L93 Difference]: Finished difference Result 149 states and 157 transitions. [2020-12-21 21:30:19,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:30:19,615 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 76 [2020-12-21 21:30:19,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:19,616 INFO L225 Difference]: With dead ends: 149 [2020-12-21 21:30:19,617 INFO L226 Difference]: Without dead ends: 86 [2020-12-21 21:30:19,617 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 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 21:30:19,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-12-21 21:30:19,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2020-12-21 21:30:19,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-12-21 21:30:19,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 87 transitions. [2020-12-21 21:30:19,624 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 87 transitions. Word has length 76 [2020-12-21 21:30:19,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:19,624 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 87 transitions. [2020-12-21 21:30:19,624 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:30:19,624 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 87 transitions. [2020-12-21 21:30:19,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-12-21 21:30:19,625 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:19,625 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:19,840 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:30:19,841 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:19,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:19,842 INFO L82 PathProgramCache]: Analyzing trace with hash 510645060, now seen corresponding path program 14 times [2020-12-21 21:30:19,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:19,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873800792] [2020-12-21 21:30:19,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:19,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:20,090 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-12-21 21:30:20,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873800792] [2020-12-21 21:30:20,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751366013] [2020-12-21 21:30:20,091 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 21:30:20,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:30:20,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:20,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:30:20,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:20,279 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-12-21 21:30:20,279 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:20,279 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:30:20,280 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167283071] [2020-12-21 21:30:20,280 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:30:20,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:20,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:30:20,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:30:20,281 INFO L87 Difference]: Start difference. First operand 84 states and 87 transitions. Second operand 18 states. [2020-12-21 21:30:20,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:20,452 INFO L93 Difference]: Finished difference Result 158 states and 166 transitions. [2020-12-21 21:30:20,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:30:20,452 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2020-12-21 21:30:20,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:20,457 INFO L225 Difference]: With dead ends: 158 [2020-12-21 21:30:20,457 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 21:30:20,461 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 81 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 21:30:20,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 21:30:20,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 89. [2020-12-21 21:30:20,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-12-21 21:30:20,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-12-21 21:30:20,469 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 81 [2020-12-21 21:30:20,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:20,470 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-12-21 21:30:20,471 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:30:20,471 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-12-21 21:30:20,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-12-21 21:30:20,472 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:20,472 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:20,685 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:20,686 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:20,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:20,687 INFO L82 PathProgramCache]: Analyzing trace with hash -498582341, now seen corresponding path program 15 times [2020-12-21 21:30:20,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:20,688 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259045048] [2020-12-21 21:30:20,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:20,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:20,950 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2020-12-21 21:30:20,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259045048] [2020-12-21 21:30:20,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885012709] [2020-12-21 21:30:20,951 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 21:30:25,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-21 21:30:25,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:25,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 21:30:25,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:25,668 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2020-12-21 21:30:25,668 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:25,669 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 21:30:25,669 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387295714] [2020-12-21 21:30:25,669 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:30:25,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:25,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:30:25,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:30:25,671 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 19 states. [2020-12-21 21:30:25,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:25,852 INFO L93 Difference]: Finished difference Result 167 states and 175 transitions. [2020-12-21 21:30:25,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:30:25,852 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 86 [2020-12-21 21:30:25,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:25,853 INFO L225 Difference]: With dead ends: 167 [2020-12-21 21:30:25,853 INFO L226 Difference]: Without dead ends: 96 [2020-12-21 21:30:25,854 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:30:25,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-12-21 21:30:25,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2020-12-21 21:30:25,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-12-21 21:30:25,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 97 transitions. [2020-12-21 21:30:25,859 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 97 transitions. Word has length 86 [2020-12-21 21:30:25,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:25,860 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 97 transitions. [2020-12-21 21:30:25,860 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:30:25,860 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 97 transitions. [2020-12-21 21:30:25,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-12-21 21:30:25,861 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:25,861 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:26,062 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:30:26,062 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:26,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:26,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1720143460, now seen corresponding path program 16 times [2020-12-21 21:30:26,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:26,064 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727933391] [2020-12-21 21:30:26,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:26,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:26,317 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2020-12-21 21:30:26,317 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727933391] [2020-12-21 21:30:26,317 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850724880] [2020-12-21 21:30:26,318 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 21:30:26,411 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:30:26,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:26,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:30:26,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:26,536 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-12-21 21:30:26,536 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:26,536 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 21:30:26,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519155907] [2020-12-21 21:30:26,537 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:30:26,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:26,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:30:26,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:30:26,538 INFO L87 Difference]: Start difference. First operand 94 states and 97 transitions. Second operand 20 states. [2020-12-21 21:30:26,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:26,706 INFO L93 Difference]: Finished difference Result 176 states and 184 transitions. [2020-12-21 21:30:26,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:30:26,706 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 91 [2020-12-21 21:30:26,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:26,707 INFO L225 Difference]: With dead ends: 176 [2020-12-21 21:30:26,708 INFO L226 Difference]: Without dead ends: 101 [2020-12-21 21:30:26,708 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:30:26,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-12-21 21:30:26,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2020-12-21 21:30:26,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-12-21 21:30:26,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-12-21 21:30:26,713 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 91 [2020-12-21 21:30:26,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:26,714 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-12-21 21:30:26,714 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:30:26,714 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-12-21 21:30:26,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-12-21 21:30:26,715 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:26,715 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:26,930 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:30:26,931 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:26,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:26,932 INFO L82 PathProgramCache]: Analyzing trace with hash -682438317, now seen corresponding path program 17 times [2020-12-21 21:30:26,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:26,932 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975849779] [2020-12-21 21:30:26,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:26,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:27,229 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2020-12-21 21:30:27,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975849779] [2020-12-21 21:30:27,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663686007] [2020-12-21 21:30:27,230 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