/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/loop-acceleration/array_2-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 04:21:57,484 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 04:21:57,487 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 04:21:57,544 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 04:21:57,545 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 04:21:57,550 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 04:21:57,555 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 04:21:57,572 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 04:21:57,576 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 04:21:57,583 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 04:21:57,584 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 04:21:57,586 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-22 04:21:57,586 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 04:21:57,590 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 04:21:57,593 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 04:21:57,594 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 04:21:57,596 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 04:21:57,599 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 04:21:57,606 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 04:21:57,615 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 04:21:57,617 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 04:21:57,619 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 04:21:57,622 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 04:21:57,624 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 04:21:57,633 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 04:21:57,646 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 04:21:57,647 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 04:21:57,647 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 04:21:57,648 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 04:21:57,705 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 04:21:57,705 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 04:21:57,709 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 04:21:57,710 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 04:21:57,710 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 04:21:57,710 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 04:21:57,711 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 04:21:57,711 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 04:21:57,711 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 04:21:57,712 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 04:21:57,713 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 04:21:57,713 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 04:21:57,713 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 04:21:57,713 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 04:21:57,714 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 04:21:57,714 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 04:21:57,714 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 04:21:57,714 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 04:21:57,715 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 04:21:57,715 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 04:21:57,715 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 04:21:57,716 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 04:21:57,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 04:21:57,716 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 04:21:57,716 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 04:21:57,717 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 04:21:58,147 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 04:21:58,182 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 04:21:58,185 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 04:21:58,187 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 04:21:58,188 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 04:21:58,188 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/array_2-1.i [2020-12-22 04:21:58,272 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/50c5a8747/0b55ee35ac8c4a1db59800173bc51f09/FLAGa2b68c962 [2020-12-22 04:21:58,913 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 04:21:58,913 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/array_2-1.i [2020-12-22 04:21:58,921 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/50c5a8747/0b55ee35ac8c4a1db59800173bc51f09/FLAGa2b68c962 [2020-12-22 04:21:59,249 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/50c5a8747/0b55ee35ac8c4a1db59800173bc51f09 [2020-12-22 04:21:59,253 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 04:21:59,255 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 04:21:59,260 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 04:21:59,260 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 04:21:59,264 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 04:21:59,265 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,267 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16bcf767 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59, skipping insertion in model container [2020-12-22 04:21:59,267 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,276 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 04:21:59,294 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 04:21:59,514 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/loop-acceleration/array_2-1.i[849,862] [2020-12-22 04:21:59,530 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 04:21:59,540 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 04:21:59,556 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/loop-acceleration/array_2-1.i[849,862] [2020-12-22 04:21:59,563 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 04:21:59,580 INFO L208 MainTranslator]: Completed translation [2020-12-22 04:21:59,581 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59 WrapperNode [2020-12-22 04:21:59,581 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 04:21:59,583 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 04:21:59,583 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 04:21:59,583 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 04:21:59,593 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,602 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,623 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 04:21:59,624 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 04:21:59,624 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 04:21:59,624 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 04:21:59,634 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,634 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,636 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,636 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,642 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,647 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,648 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (1/1) ... [2020-12-22 04:21:59,651 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 04:21:59,652 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 04:21:59,652 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 04:21:59,652 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 04:21:59,653 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (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 [2020-12-22 04:21:59,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 04:21:59,767 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 04:21:59,767 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-22 04:21:59,767 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 04:21:59,767 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 04:21:59,767 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-22 04:21:59,768 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-22 04:22:00,049 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 04:22:00,050 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-22 04:22:00,052 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:22:00 BoogieIcfgContainer [2020-12-22 04:22:00,052 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 04:22:00,054 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 04:22:00,054 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 04:22:00,058 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 04:22:00,058 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:21:59" (1/3) ... [2020-12-22 04:22:00,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@615eb969 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:22:00, skipping insertion in model container [2020-12-22 04:22:00,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:21:59" (2/3) ... [2020-12-22 04:22:00,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@615eb969 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:22:00, skipping insertion in model container [2020-12-22 04:22:00,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:22:00" (3/3) ... [2020-12-22 04:22:00,062 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-1.i [2020-12-22 04:22:00,070 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 04:22:00,076 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 04:22:00,100 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 04:22:00,133 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 04:22:00,133 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 04:22:00,133 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 04:22:00,133 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 04:22:00,134 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 04:22:00,134 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 04:22:00,134 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 04:22:00,134 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 04:22:00,174 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-12-22 04:22:00,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-22 04:22:00,187 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:00,188 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:00,189 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:00,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:00,206 INFO L82 PathProgramCache]: Analyzing trace with hash 212047733, now seen corresponding path program 1 times [2020-12-22 04:22:00,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:00,232 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15636186] [2020-12-22 04:22:00,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:00,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:00,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:22:00,472 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15636186] [2020-12-22 04:22:00,473 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 04:22:00,473 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 04:22:00,475 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129409773] [2020-12-22 04:22:00,480 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 04:22:00,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:00,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 04:22:00,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 04:22:00,499 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2020-12-22 04:22:00,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:00,561 INFO L93 Difference]: Finished difference Result 30 states and 40 transitions. [2020-12-22 04:22:00,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 04:22:00,564 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2020-12-22 04:22:00,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:00,574 INFO L225 Difference]: With dead ends: 30 [2020-12-22 04:22:00,574 INFO L226 Difference]: Without dead ends: 15 [2020-12-22 04:22:00,577 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 [2020-12-22 04:22:00,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-12-22 04:22:00,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 13. [2020-12-22 04:22:00,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-22 04:22:00,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-12-22 04:22:00,617 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 8 [2020-12-22 04:22:00,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:00,618 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-12-22 04:22:00,618 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 04:22:00,618 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-12-22 04:22:00,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-22 04:22:00,619 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:00,619 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:00,619 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 04:22:00,620 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:00,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:00,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1312443705, now seen corresponding path program 1 times [2020-12-22 04:22:00,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:00,622 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698491542] [2020-12-22 04:22:00,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:00,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:00,682 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-22 04:22:00,683 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698491542] [2020-12-22 04:22:00,683 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374062235] [2020-12-22 04:22:00,683 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 [2020-12-22 04:22:00,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:00,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-22 04:22:00,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:00,878 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-22 04:22:00,879 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:00,879 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-22 04:22:00,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015017397] [2020-12-22 04:22:00,881 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 04:22:00,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:00,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 04:22:00,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-22 04:22:00,884 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-12-22 04:22:00,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:00,951 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2020-12-22 04:22:00,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 04:22:00,952 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-12-22 04:22:00,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:00,953 INFO L225 Difference]: With dead ends: 27 [2020-12-22 04:22:00,953 INFO L226 Difference]: Without dead ends: 19 [2020-12-22 04:22:00,954 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-22 04:22:00,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-22 04:22:00,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-12-22 04:22:00,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-22 04:22:00,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-12-22 04:22:00,959 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2020-12-22 04:22:00,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:00,960 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-12-22 04:22:00,960 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 04:22:00,960 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-12-22 04:22:00,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-22 04:22:00,961 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:00,961 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:01,175 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-22 04:22:01,176 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:01,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:01,179 INFO L82 PathProgramCache]: Analyzing trace with hash 2052428029, now seen corresponding path program 2 times [2020-12-22 04:22:01,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:01,179 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706281970] [2020-12-22 04:22:01,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:01,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:01,267 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 04:22:01,267 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706281970] [2020-12-22 04:22:01,268 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022335696] [2020-12-22 04:22:01,268 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 [2020-12-22 04:22:01,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 04:22:01,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:01,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-22 04:22:01,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:01,405 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 04:22:01,405 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:01,406 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-22 04:22:01,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81849841] [2020-12-22 04:22:01,406 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-22 04:22:01,407 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:01,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-22 04:22:01,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-22 04:22:01,408 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 6 states. [2020-12-22 04:22:01,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:01,474 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-12-22 04:22:01,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 04:22:01,475 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-12-22 04:22:01,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:01,476 INFO L225 Difference]: With dead ends: 33 [2020-12-22 04:22:01,476 INFO L226 Difference]: Without dead ends: 23 [2020-12-22 04:22:01,477 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-22 04:22:01,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-22 04:22:01,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-12-22 04:22:01,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-22 04:22:01,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-12-22 04:22:01,482 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2020-12-22 04:22:01,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:01,483 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-12-22 04:22:01,483 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-22 04:22:01,483 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-12-22 04:22:01,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-22 04:22:01,484 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:01,484 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:01,696 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:22:01,697 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:01,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:01,701 INFO L82 PathProgramCache]: Analyzing trace with hash -319135039, now seen corresponding path program 3 times [2020-12-22 04:22:01,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:01,702 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643015547] [2020-12-22 04:22:01,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:01,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:01,900 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-22 04:22:01,900 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643015547] [2020-12-22 04:22:01,900 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056778] [2020-12-22 04:22:01,901 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 [2020-12-22 04:22:01,995 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-22 04:22:01,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:01,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-22 04:22:01,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:02,072 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-22 04:22:02,072 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:02,072 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-22 04:22:02,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611075454] [2020-12-22 04:22:02,073 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-22 04:22:02,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:02,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-22 04:22:02,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-22 04:22:02,075 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-12-22 04:22:02,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:02,176 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2020-12-22 04:22:02,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-22 04:22:02,177 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2020-12-22 04:22:02,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:02,178 INFO L225 Difference]: With dead ends: 39 [2020-12-22 04:22:02,179 INFO L226 Difference]: Without dead ends: 27 [2020-12-22 04:22:02,179 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-22 04:22:02,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-22 04:22:02,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2020-12-22 04:22:02,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-22 04:22:02,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-12-22 04:22:02,185 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2020-12-22 04:22:02,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:02,185 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-12-22 04:22:02,185 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-22 04:22:02,185 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-12-22 04:22:02,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 04:22:02,186 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:02,186 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:02,400 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:22:02,402 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:02,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:02,403 INFO L82 PathProgramCache]: Analyzing trace with hash 682476165, now seen corresponding path program 4 times [2020-12-22 04:22:02,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:02,404 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885870464] [2020-12-22 04:22:02,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:02,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:02,566 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-22 04:22:02,567 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885870464] [2020-12-22 04:22:02,567 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675875324] [2020-12-22 04:22:02,567 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 [2020-12-22 04:22:02,658 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 04:22:02,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:02,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 04:22:02,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:02,742 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-22 04:22:02,742 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:02,743 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-22 04:22:02,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265924009] [2020-12-22 04:22:02,744 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 04:22:02,744 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:02,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 04:22:02,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-22 04:22:02,746 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 8 states. [2020-12-22 04:22:02,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:02,851 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2020-12-22 04:22:02,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 04:22:02,852 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-12-22 04:22:02,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:02,853 INFO L225 Difference]: With dead ends: 45 [2020-12-22 04:22:02,854 INFO L226 Difference]: Without dead ends: 31 [2020-12-22 04:22:02,854 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-22 04:22:02,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-22 04:22:02,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-12-22 04:22:02,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-22 04:22:02,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-12-22 04:22:02,860 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2020-12-22 04:22:02,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:02,861 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-12-22 04:22:02,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 04:22:02,861 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-12-22 04:22:02,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-22 04:22:02,862 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:02,862 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:03,077 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:22:03,078 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:03,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:03,079 INFO L82 PathProgramCache]: Analyzing trace with hash 1450487881, now seen corresponding path program 5 times [2020-12-22 04:22:03,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:03,080 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651032127] [2020-12-22 04:22:03,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:03,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:03,196 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-22 04:22:03,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651032127] [2020-12-22 04:22:03,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312544981] [2020-12-22 04:22:03,197 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 [2020-12-22 04:22:03,573 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-22 04:22:03,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:03,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-22 04:22:03,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:03,706 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-22 04:22:03,707 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:03,707 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-22 04:22:03,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775118124] [2020-12-22 04:22:03,708 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-22 04:22:03,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:03,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-22 04:22:03,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-22 04:22:03,709 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-12-22 04:22:03,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:03,814 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2020-12-22 04:22:03,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 04:22:03,815 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-12-22 04:22:03,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:03,816 INFO L225 Difference]: With dead ends: 51 [2020-12-22 04:22:03,816 INFO L226 Difference]: Without dead ends: 35 [2020-12-22 04:22:03,817 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-22 04:22:03,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-12-22 04:22:03,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2020-12-22 04:22:03,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-22 04:22:03,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-12-22 04:22:03,822 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2020-12-22 04:22:03,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:03,823 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-12-22 04:22:03,823 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-22 04:22:03,823 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-12-22 04:22:03,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-22 04:22:03,824 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:03,824 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:04,038 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-22 04:22:04,039 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:04,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:04,040 INFO L82 PathProgramCache]: Analyzing trace with hash -975950835, now seen corresponding path program 6 times [2020-12-22 04:22:04,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:04,041 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469665787] [2020-12-22 04:22:04,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:04,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:04,206 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-22 04:22:04,207 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469665787] [2020-12-22 04:22:04,207 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535480700] [2020-12-22 04:22:04,207 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 [2020-12-22 04:22:04,441 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-22 04:22:04,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:04,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-22 04:22:04,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:04,550 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-22 04:22:04,550 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:04,550 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-22 04:22:04,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131379689] [2020-12-22 04:22:04,551 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-22 04:22:04,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:04,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-22 04:22:04,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-22 04:22:04,553 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 10 states. [2020-12-22 04:22:04,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:04,676 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2020-12-22 04:22:04,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-22 04:22:04,677 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-12-22 04:22:04,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:04,678 INFO L225 Difference]: With dead ends: 57 [2020-12-22 04:22:04,678 INFO L226 Difference]: Without dead ends: 39 [2020-12-22 04:22:04,678 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-22 04:22:04,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-22 04:22:04,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-12-22 04:22:04,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-22 04:22:04,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-12-22 04:22:04,684 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 32 [2020-12-22 04:22:04,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:04,685 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-12-22 04:22:04,685 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-22 04:22:04,685 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-12-22 04:22:04,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-22 04:22:04,686 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:04,686 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:04,892 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:22:04,893 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:04,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:04,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1825650129, now seen corresponding path program 7 times [2020-12-22 04:22:04,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:04,894 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345598556] [2020-12-22 04:22:04,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:04,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:05,091 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-22 04:22:05,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345598556] [2020-12-22 04:22:05,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452632711] [2020-12-22 04:22:05,092 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 [2020-12-22 04:22:05,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:05,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-22 04:22:05,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:05,253 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-22 04:22:05,253 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:05,253 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-22 04:22:05,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985654235] [2020-12-22 04:22:05,254 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-22 04:22:05,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:05,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-22 04:22:05,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-22 04:22:05,255 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 11 states. [2020-12-22 04:22:05,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:05,392 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2020-12-22 04:22:05,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-22 04:22:05,393 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2020-12-22 04:22:05,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:05,394 INFO L225 Difference]: With dead ends: 63 [2020-12-22 04:22:05,394 INFO L226 Difference]: Without dead ends: 43 [2020-12-22 04:22:05,394 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-22 04:22:05,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-22 04:22:05,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-12-22 04:22:05,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-22 04:22:05,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-12-22 04:22:05,400 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 36 [2020-12-22 04:22:05,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:05,400 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-12-22 04:22:05,401 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-22 04:22:05,401 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-12-22 04:22:05,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-22 04:22:05,402 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:05,402 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:05,611 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:22:05,612 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:05,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:05,613 INFO L82 PathProgramCache]: Analyzing trace with hash 1743834517, now seen corresponding path program 8 times [2020-12-22 04:22:05,613 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:05,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923702337] [2020-12-22 04:22:05,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:05,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:05,828 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-22 04:22:05,829 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923702337] [2020-12-22 04:22:05,831 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930926493] [2020-12-22 04:22:05,832 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 [2020-12-22 04:22:05,935 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 04:22:05,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:05,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-22 04:22:05,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:06,027 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-22 04:22:06,028 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:06,028 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-22 04:22:06,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357113460] [2020-12-22 04:22:06,029 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-22 04:22:06,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:06,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-22 04:22:06,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-22 04:22:06,030 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 12 states. [2020-12-22 04:22:06,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:06,162 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2020-12-22 04:22:06,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-22 04:22:06,163 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-12-22 04:22:06,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:06,164 INFO L225 Difference]: With dead ends: 69 [2020-12-22 04:22:06,164 INFO L226 Difference]: Without dead ends: 47 [2020-12-22 04:22:06,165 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-22 04:22:06,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-12-22 04:22:06,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2020-12-22 04:22:06,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-22 04:22:06,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-12-22 04:22:06,170 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 40 [2020-12-22 04:22:06,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:06,171 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-12-22 04:22:06,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-22 04:22:06,171 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-12-22 04:22:06,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-22 04:22:06,172 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:06,172 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:06,385 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-22 04:22:06,386 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:06,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:06,387 INFO L82 PathProgramCache]: Analyzing trace with hash 2050487129, now seen corresponding path program 9 times [2020-12-22 04:22:06,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:06,388 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526776057] [2020-12-22 04:22:06,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:06,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:06,603 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-22 04:22:06,603 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526776057] [2020-12-22 04:22:06,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967279003] [2020-12-22 04:22:06,604 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 [2020-12-22 04:22:07,979 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-22 04:22:07,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:07,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-22 04:22:07,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:08,087 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-22 04:22:08,087 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:08,087 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-22 04:22:08,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994695523] [2020-12-22 04:22:08,088 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-22 04:22:08,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:08,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-22 04:22:08,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-22 04:22:08,090 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 13 states. [2020-12-22 04:22:08,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:08,236 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2020-12-22 04:22:08,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-22 04:22:08,237 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 44 [2020-12-22 04:22:08,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:08,237 INFO L225 Difference]: With dead ends: 75 [2020-12-22 04:22:08,238 INFO L226 Difference]: Without dead ends: 51 [2020-12-22 04:22:08,238 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-22 04:22:08,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-22 04:22:08,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2020-12-22 04:22:08,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-22 04:22:08,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-12-22 04:22:08,244 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2020-12-22 04:22:08,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:08,244 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-12-22 04:22:08,244 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-22 04:22:08,245 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-12-22 04:22:08,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-22 04:22:08,245 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:08,246 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:08,458 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:22:08,459 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:08,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:08,460 INFO L82 PathProgramCache]: Analyzing trace with hash -1926519011, now seen corresponding path program 10 times [2020-12-22 04:22:08,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:08,461 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82837968] [2020-12-22 04:22:08,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:08,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:08,711 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-22 04:22:08,711 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82837968] [2020-12-22 04:22:08,711 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388235758] [2020-12-22 04:22:08,711 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 [2020-12-22 04:22:08,828 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 04:22:08,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:08,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-22 04:22:08,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:08,965 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-22 04:22:08,966 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:08,966 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-22 04:22:08,966 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986433988] [2020-12-22 04:22:08,968 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-22 04:22:08,969 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:08,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-22 04:22:08,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-22 04:22:08,970 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 14 states. [2020-12-22 04:22:09,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:09,133 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2020-12-22 04:22:09,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-22 04:22:09,134 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 48 [2020-12-22 04:22:09,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:09,135 INFO L225 Difference]: With dead ends: 81 [2020-12-22 04:22:09,135 INFO L226 Difference]: Without dead ends: 55 [2020-12-22 04:22:09,135 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-22 04:22:09,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-12-22 04:22:09,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2020-12-22 04:22:09,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-22 04:22:09,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-12-22 04:22:09,141 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 48 [2020-12-22 04:22:09,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:09,141 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-12-22 04:22:09,141 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-22 04:22:09,142 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-12-22 04:22:09,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-22 04:22:09,142 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:09,143 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:09,353 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:22:09,354 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:09,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:09,355 INFO L82 PathProgramCache]: Analyzing trace with hash 818997473, now seen corresponding path program 11 times [2020-12-22 04:22:09,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:09,356 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241352097] [2020-12-22 04:22:09,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:09,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:09,606 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-22 04:22:09,606 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241352097] [2020-12-22 04:22:09,606 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871280600] [2020-12-22 04:22:09,607 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 [2020-12-22 04:22:20,460 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-22 04:22:20,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:20,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-22 04:22:20,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:20,598 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-22 04:22:20,599 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:20,599 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-22 04:22:20,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103066331] [2020-12-22 04:22:20,600 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-22 04:22:20,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:20,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-22 04:22:20,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-22 04:22:20,601 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 15 states. [2020-12-22 04:22:20,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:20,755 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2020-12-22 04:22:20,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-22 04:22:20,756 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 52 [2020-12-22 04:22:20,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:20,758 INFO L225 Difference]: With dead ends: 87 [2020-12-22 04:22:20,758 INFO L226 Difference]: Without dead ends: 59 [2020-12-22 04:22:20,758 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-22 04:22:20,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-22 04:22:20,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2020-12-22 04:22:20,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-22 04:22:20,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-12-22 04:22:20,765 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 52 [2020-12-22 04:22:20,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:20,765 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-12-22 04:22:20,765 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-22 04:22:20,765 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-12-22 04:22:20,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-12-22 04:22:20,767 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:20,768 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:20,968 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-22 04:22:20,969 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:20,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:20,970 INFO L82 PathProgramCache]: Analyzing trace with hash 464304293, now seen corresponding path program 12 times [2020-12-22 04:22:20,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:20,971 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938856003] [2020-12-22 04:22:20,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:20,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:21,228 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-22 04:22:21,228 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938856003] [2020-12-22 04:22:21,242 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325777939] [2020-12-22 04:22:21,242 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 [2020-12-22 04:22:26,173 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-22 04:22:26,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:26,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-22 04:22:26,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:26,398 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 23 proven. 144 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-22 04:22:26,399 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:26,399 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17] total 18 [2020-12-22 04:22:26,399 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669346989] [2020-12-22 04:22:26,400 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-22 04:22:26,400 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:26,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-22 04:22:26,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-22 04:22:26,401 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 18 states. [2020-12-22 04:22:26,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:26,590 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2020-12-22 04:22:26,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-22 04:22:26,591 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2020-12-22 04:22:26,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:26,592 INFO L225 Difference]: With dead ends: 95 [2020-12-22 04:22:26,592 INFO L226 Difference]: Without dead ends: 65 [2020-12-22 04:22:26,593 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-22 04:22:26,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-12-22 04:22:26,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2020-12-22 04:22:26,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-12-22 04:22:26,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2020-12-22 04:22:26,602 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 56 [2020-12-22 04:22:26,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:26,603 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2020-12-22 04:22:26,603 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-22 04:22:26,603 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2020-12-22 04:22:26,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-12-22 04:22:26,606 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:26,607 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:26,810 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-22 04:22:26,811 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:26,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:26,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1637614125, now seen corresponding path program 13 times [2020-12-22 04:22:26,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:26,813 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747593775] [2020-12-22 04:22:26,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:26,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:27,157 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-22 04:22:27,157 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747593775] [2020-12-22 04:22:27,157 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878370839] [2020-12-22 04:22:27,158 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 [2020-12-22 04:22:27,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:27,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-22 04:22:27,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:27,436 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-22 04:22:27,436 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:27,437 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-22 04:22:27,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994252836] [2020-12-22 04:22:27,437 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-22 04:22:27,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:27,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-22 04:22:27,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-22 04:22:27,439 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand 18 states. [2020-12-22 04:22:27,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:27,664 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2020-12-22 04:22:27,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-22 04:22:27,664 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 64 [2020-12-22 04:22:27,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:27,665 INFO L225 Difference]: With dead ends: 105 [2020-12-22 04:22:27,665 INFO L226 Difference]: Without dead ends: 71 [2020-12-22 04:22:27,666 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-22 04:22:27,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-12-22 04:22:27,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2020-12-22 04:22:27,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-12-22 04:22:27,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2020-12-22 04:22:27,674 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2020-12-22 04:22:27,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:27,674 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2020-12-22 04:22:27,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-22 04:22:27,674 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2020-12-22 04:22:27,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-12-22 04:22:27,675 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:27,675 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:27,888 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-22 04:22:27,889 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:27,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:27,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1782152177, now seen corresponding path program 14 times [2020-12-22 04:22:27,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:27,890 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329889226] [2020-12-22 04:22:27,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:27,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:28,244 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-22 04:22:28,245 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329889226] [2020-12-22 04:22:28,245 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429573344] [2020-12-22 04:22:28,245 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 [2020-12-22 04:22:28,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 04:22:28,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:28,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-22 04:22:28,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:28,503 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-22 04:22:28,503 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:28,503 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-22 04:22:28,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375751338] [2020-12-22 04:22:28,504 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-22 04:22:28,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:28,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-22 04:22:28,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-22 04:22:28,505 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 19 states. [2020-12-22 04:22:28,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:28,703 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2020-12-22 04:22:28,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-22 04:22:28,704 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 68 [2020-12-22 04:22:28,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:28,705 INFO L225 Difference]: With dead ends: 111 [2020-12-22 04:22:28,705 INFO L226 Difference]: Without dead ends: 75 [2020-12-22 04:22:28,706 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-22 04:22:28,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-12-22 04:22:28,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2020-12-22 04:22:28,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-12-22 04:22:28,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2020-12-22 04:22:28,712 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 68 [2020-12-22 04:22:28,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:28,713 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2020-12-22 04:22:28,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-22 04:22:28,713 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2020-12-22 04:22:28,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-12-22 04:22:28,714 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:28,714 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:28,928 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:22:28,929 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:28,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:28,930 INFO L82 PathProgramCache]: Analyzing trace with hash 354517941, now seen corresponding path program 15 times [2020-12-22 04:22:28,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:28,931 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952504556] [2020-12-22 04:22:28,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:28,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:29,370 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-22 04:22:29,371 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952504556] [2020-12-22 04:22:29,371 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861150342] [2020-12-22 04:22:29,371 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 [2020-12-22 04:22:46,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2020-12-22 04:22:46,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:46,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-22 04:22:46,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:46,284 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-22 04:22:46,284 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:46,284 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-22 04:22:46,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960958087] [2020-12-22 04:22:46,285 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-22 04:22:46,285 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:46,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-22 04:22:46,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-22 04:22:46,287 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 20 states. [2020-12-22 04:22:46,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:46,509 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2020-12-22 04:22:46,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-22 04:22:46,510 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 72 [2020-12-22 04:22:46,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:46,511 INFO L225 Difference]: With dead ends: 117 [2020-12-22 04:22:46,511 INFO L226 Difference]: Without dead ends: 79 [2020-12-22 04:22:46,512 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-22 04:22:46,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-12-22 04:22:46,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2020-12-22 04:22:46,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-12-22 04:22:46,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2020-12-22 04:22:46,518 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 72 [2020-12-22 04:22:46,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:46,518 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2020-12-22 04:22:46,518 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-22 04:22:46,519 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2020-12-22 04:22:46,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-12-22 04:22:46,519 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:46,519 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:46,733 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-22 04:22:46,734 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:46,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:46,735 INFO L82 PathProgramCache]: Analyzing trace with hash 1499011449, now seen corresponding path program 16 times [2020-12-22 04:22:46,736 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:46,736 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104522118] [2020-12-22 04:22:46,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:46,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:47,177 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2020-12-22 04:22:47,178 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104522118] [2020-12-22 04:22:47,178 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619338310] [2020-12-22 04:22:47,178 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 [2020-12-22 04:22:47,318 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 04:22:47,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:22:47,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-22 04:22:47,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:22:47,463 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2020-12-22 04:22:47,463 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:22:47,464 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-22 04:22:47,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967559509] [2020-12-22 04:22:47,464 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-22 04:22:47,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:22:47,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-22 04:22:47,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-22 04:22:47,466 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 21 states. [2020-12-22 04:22:47,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:22:47,688 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2020-12-22 04:22:47,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-22 04:22:47,689 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 76 [2020-12-22 04:22:47,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:22:47,690 INFO L225 Difference]: With dead ends: 123 [2020-12-22 04:22:47,690 INFO L226 Difference]: Without dead ends: 83 [2020-12-22 04:22:47,691 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-22 04:22:47,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-12-22 04:22:47,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 81. [2020-12-22 04:22:47,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-12-22 04:22:47,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2020-12-22 04:22:47,697 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 76 [2020-12-22 04:22:47,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:22:47,697 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2020-12-22 04:22:47,697 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-22 04:22:47,697 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2020-12-22 04:22:47,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-12-22 04:22:47,698 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:22:47,698 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:22:47,911 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-22 04:22:47,912 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:22:47,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:22:47,913 INFO L82 PathProgramCache]: Analyzing trace with hash 1415920957, now seen corresponding path program 17 times [2020-12-22 04:22:47,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:22:47,914 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985796559] [2020-12-22 04:22:47,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:22:47,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:22:48,366 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2020-12-22 04:22:48,366 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985796559] [2020-12-22 04:22:48,366 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878817189] [2020-12-22 04:22:48,367 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