/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 00:07:16,440 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 00:07:16,445 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 00:07:16,508 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 00:07:16,509 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 00:07:16,514 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 00:07:16,518 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 00:07:16,525 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 00:07:16,529 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 00:07:16,536 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 00:07:16,541 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 00:07:16,542 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 00:07:16,543 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 00:07:16,546 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 00:07:16,549 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 00:07:16,551 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 00:07:16,567 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 00:07:16,571 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 00:07:16,580 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 00:07:16,589 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 00:07:16,591 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 00:07:16,594 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 00:07:16,596 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 00:07:16,599 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 00:07:16,609 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 00:07:16,629 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 00:07:16,631 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 00:07:16,632 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 00:07:16,633 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 00:07:16,685 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 00:07:16,685 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 00:07:16,690 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 00:07:16,690 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 00:07:16,690 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 00:07:16,691 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 00:07:16,691 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 00:07:16,691 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 00:07:16,691 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 00:07:16,691 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 00:07:16,693 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 00:07:16,693 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 00:07:16,693 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 00:07:16,694 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 00:07:16,694 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 00:07:16,694 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 00:07:16,694 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 00:07:16,695 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 00:07:16,695 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 00:07:16,695 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 00:07:16,695 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 00:07:16,696 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 00:07:16,696 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 00:07:16,696 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 00:07:16,696 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 00:07:16,696 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-bitabs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 00:07:17,128 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 00:07:17,179 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 00:07:17,183 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 00:07:17,185 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 00:07:17,186 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 00:07:17,187 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2020-12-23 00:07:17,271 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/c415035ff/1eb7797a166c4256887bd5b084f1ec4b/FLAGf505ee8e2 [2020-12-23 00:07:17,943 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 00:07:17,944 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2020-12-23 00:07:17,954 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/c415035ff/1eb7797a166c4256887bd5b084f1ec4b/FLAGf505ee8e2 [2020-12-23 00:07:18,310 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/c415035ff/1eb7797a166c4256887bd5b084f1ec4b [2020-12-23 00:07:18,314 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 00:07:18,319 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 00:07:18,324 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 00:07:18,324 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 00:07:18,329 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 00:07:18,331 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,333 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42040e32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18, skipping insertion in model container [2020-12-23 00:07:18,334 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,344 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 00:07:18,364 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 00:07:18,585 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_palindrome_ground.i[819,832] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~A~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~A~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2020-12-23 00:07:18,607 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:07:18,615 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 00:07:18,630 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_palindrome_ground.i[819,832] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#A~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#A~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#A~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#A~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2020-12-23 00:07:18,640 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:07:18,656 INFO L208 MainTranslator]: Completed translation [2020-12-23 00:07:18,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18 WrapperNode [2020-12-23 00:07:18,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 00:07:18,658 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 00:07:18,658 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 00:07:18,658 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 00:07:18,669 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,678 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,702 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 00:07:18,703 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 00:07:18,703 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 00:07:18,703 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 00:07:18,714 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,714 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,716 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,716 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,722 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,728 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,730 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... [2020-12-23 00:07:18,732 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 00:07:18,733 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 00:07:18,734 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 00:07:18,734 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 00:07:18,735 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:18,852 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 00:07:18,853 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 00:07:18,853 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 00:07:18,853 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 00:07:18,853 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 00:07:18,854 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 00:07:18,854 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 00:07:19,147 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 00:07:19,148 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 00:07:19,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:07:19 BoogieIcfgContainer [2020-12-23 00:07:19,153 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 00:07:19,156 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 00:07:19,156 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 00:07:19,161 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 00:07:19,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 12:07:18" (1/3) ... [2020-12-23 00:07:19,163 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bfd0d1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:07:19, skipping insertion in model container [2020-12-23 00:07:19,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:07:18" (2/3) ... [2020-12-23 00:07:19,164 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bfd0d1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:07:19, skipping insertion in model container [2020-12-23 00:07:19,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:07:19" (3/3) ... [2020-12-23 00:07:19,166 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2020-12-23 00:07:19,175 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 00:07:19,182 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 00:07:19,206 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 00:07:19,240 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 00:07:19,241 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 00:07:19,241 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 00:07:19,241 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 00:07:19,241 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 00:07:19,241 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 00:07:19,241 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 00:07:19,242 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 00:07:19,260 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-12-23 00:07:19,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 00:07:19,268 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:19,269 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:19,270 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:19,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:19,278 INFO L82 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2020-12-23 00:07:19,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:19,293 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517853997] [2020-12-23 00:07:19,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:19,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:19,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 00:07:19,512 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517853997] [2020-12-23 00:07:19,512 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:07:19,513 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 00:07:19,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019220244] [2020-12-23 00:07:19,519 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:07:19,519 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:19,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:07:19,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:07:19,539 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2020-12-23 00:07:19,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:19,607 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2020-12-23 00:07:19,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:07:19,611 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-23 00:07:19,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:19,624 INFO L225 Difference]: With dead ends: 36 [2020-12-23 00:07:19,624 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 00:07:19,628 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 [2020-12-23 00:07:19,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 00:07:19,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2020-12-23 00:07:19,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-23 00:07:19,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-23 00:07:19,690 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-12-23 00:07:19,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:19,694 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-23 00:07:19,694 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:07:19,694 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-23 00:07:19,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-23 00:07:19,695 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:19,695 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:19,696 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 00:07:19,696 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:19,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:19,701 INFO L82 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2020-12-23 00:07:19,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:19,702 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794196520] [2020-12-23 00:07:19,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:19,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:19,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:07:19,846 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794196520] [2020-12-23 00:07:19,848 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702503727] [2020-12-23 00:07:19,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:19,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:19,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 00:07:19,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:20,040 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:07:20,041 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:20,041 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 00:07:20,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469143077] [2020-12-23 00:07:20,044 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 00:07:20,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:20,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 00:07:20,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:07:20,046 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-12-23 00:07:20,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:20,110 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2020-12-23 00:07:20,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 00:07:20,111 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-12-23 00:07:20,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:20,112 INFO L225 Difference]: With dead ends: 33 [2020-12-23 00:07:20,113 INFO L226 Difference]: Without dead ends: 22 [2020-12-23 00:07:20,114 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:07:20,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-23 00:07:20,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2020-12-23 00:07:20,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-23 00:07:20,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-23 00:07:20,120 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 13 [2020-12-23 00:07:20,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:20,120 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-23 00:07:20,120 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 00:07:20,120 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-23 00:07:20,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-23 00:07:20,121 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:20,121 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:20,334 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 00:07:20,335 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:20,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:20,336 INFO L82 PathProgramCache]: Analyzing trace with hash -799235507, now seen corresponding path program 2 times [2020-12-23 00:07:20,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:20,337 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617500304] [2020-12-23 00:07:20,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:20,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:20,420 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 00:07:20,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617500304] [2020-12-23 00:07:20,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513191974] [2020-12-23 00:07:20,421 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:20,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:07:20,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:20,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:07:20,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:20,535 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 00:07:20,536 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:20,536 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 00:07:20,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388008138] [2020-12-23 00:07:20,537 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 00:07:20,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:20,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 00:07:20,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:07:20,539 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-12-23 00:07:20,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:20,588 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-12-23 00:07:20,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 00:07:20,589 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-12-23 00:07:20,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:20,590 INFO L225 Difference]: With dead ends: 39 [2020-12-23 00:07:20,590 INFO L226 Difference]: Without dead ends: 26 [2020-12-23 00:07:20,591 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:07:20,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-23 00:07:20,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-12-23 00:07:20,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-23 00:07:20,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-12-23 00:07:20,598 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-12-23 00:07:20,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:20,598 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-12-23 00:07:20,598 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 00:07:20,599 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-12-23 00:07:20,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-23 00:07:20,599 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:20,600 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:20,814 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:07:20,815 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:20,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:20,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1303246583, now seen corresponding path program 3 times [2020-12-23 00:07:20,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:20,818 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718433797] [2020-12-23 00:07:20,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:20,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:20,895 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 00:07:20,895 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718433797] [2020-12-23 00:07:20,896 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65743527] [2020-12-23 00:07:20,896 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:20,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-23 00:07:20,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:20,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 00:07:20,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:21,020 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 00:07:21,021 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:21,021 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 00:07:21,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527223001] [2020-12-23 00:07:21,022 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 00:07:21,023 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:21,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 00:07:21,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:07:21,024 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-12-23 00:07:21,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:21,094 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-12-23 00:07:21,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 00:07:21,094 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-12-23 00:07:21,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:21,095 INFO L225 Difference]: With dead ends: 45 [2020-12-23 00:07:21,095 INFO L226 Difference]: Without dead ends: 30 [2020-12-23 00:07:21,096 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:07:21,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-23 00:07:21,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2020-12-23 00:07:21,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-23 00:07:21,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-23 00:07:21,102 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2020-12-23 00:07:21,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:21,103 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-23 00:07:21,103 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 00:07:21,103 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-23 00:07:21,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-23 00:07:21,104 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:21,104 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:21,319 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:07:21,321 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:21,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:21,322 INFO L82 PathProgramCache]: Analyzing trace with hash -318070331, now seen corresponding path program 4 times [2020-12-23 00:07:21,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:21,323 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841655677] [2020-12-23 00:07:21,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:21,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:21,480 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 00:07:21,481 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841655677] [2020-12-23 00:07:21,481 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913995515] [2020-12-23 00:07:21,481 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:21,542 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:07:21,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:21,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 00:07:21,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:21,646 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 00:07:21,646 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:21,647 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 00:07:21,647 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975154786] [2020-12-23 00:07:21,649 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 00:07:21,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:21,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 00:07:21,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 00:07:21,654 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-12-23 00:07:21,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:21,722 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-12-23 00:07:21,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 00:07:21,724 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-12-23 00:07:21,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:21,725 INFO L225 Difference]: With dead ends: 51 [2020-12-23 00:07:21,725 INFO L226 Difference]: Without dead ends: 34 [2020-12-23 00:07:21,726 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 00:07:21,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-23 00:07:21,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-12-23 00:07:21,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-23 00:07:21,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-12-23 00:07:21,732 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 25 [2020-12-23 00:07:21,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:21,732 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-12-23 00:07:21,732 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 00:07:21,732 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-12-23 00:07:21,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-23 00:07:21,733 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:21,733 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:21,940 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:07:21,941 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:21,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:21,942 INFO L82 PathProgramCache]: Analyzing trace with hash 2015456385, now seen corresponding path program 5 times [2020-12-23 00:07:21,943 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:21,943 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436426674] [2020-12-23 00:07:21,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:22,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:22,095 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-23 00:07:22,095 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436426674] [2020-12-23 00:07:22,096 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830675517] [2020-12-23 00:07:22,096 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:22,282 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-23 00:07:22,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:22,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 00:07:22,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:22,381 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-23 00:07:22,382 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:22,382 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 00:07:22,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179815658] [2020-12-23 00:07:22,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 00:07:22,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:22,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 00:07:22,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:07:22,384 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 9 states. [2020-12-23 00:07:22,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:22,469 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2020-12-23 00:07:22,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 00:07:22,469 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2020-12-23 00:07:22,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:22,470 INFO L225 Difference]: With dead ends: 57 [2020-12-23 00:07:22,470 INFO L226 Difference]: Without dead ends: 38 [2020-12-23 00:07:22,471 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:07:22,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-23 00:07:22,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-12-23 00:07:22,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-23 00:07:22,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-23 00:07:22,477 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 29 [2020-12-23 00:07:22,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:22,478 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-23 00:07:22,478 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 00:07:22,478 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-23 00:07:22,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-23 00:07:22,479 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:22,479 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:22,692 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 00:07:22,693 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:22,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:22,694 INFO L82 PathProgramCache]: Analyzing trace with hash -189699779, now seen corresponding path program 6 times [2020-12-23 00:07:22,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:22,695 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757905574] [2020-12-23 00:07:22,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:22,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:22,795 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 00:07:22,795 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757905574] [2020-12-23 00:07:22,796 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006974798] [2020-12-23 00:07:22,796 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:22,930 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 00:07:22,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:22,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-23 00:07:22,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:23,028 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 00:07:23,028 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:23,028 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-23 00:07:23,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032899861] [2020-12-23 00:07:23,029 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 00:07:23,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:23,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 00:07:23,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-23 00:07:23,031 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 10 states. [2020-12-23 00:07:23,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:23,115 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2020-12-23 00:07:23,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 00:07:23,116 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 33 [2020-12-23 00:07:23,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:23,117 INFO L225 Difference]: With dead ends: 63 [2020-12-23 00:07:23,117 INFO L226 Difference]: Without dead ends: 42 [2020-12-23 00:07:23,118 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-23 00:07:23,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-23 00:07:23,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2020-12-23 00:07:23,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-23 00:07:23,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-12-23 00:07:23,125 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2020-12-23 00:07:23,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:23,126 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-12-23 00:07:23,126 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 00:07:23,126 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-12-23 00:07:23,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-23 00:07:23,127 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:23,127 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:23,337 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:07:23,338 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:23,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:23,340 INFO L82 PathProgramCache]: Analyzing trace with hash 760584185, now seen corresponding path program 7 times [2020-12-23 00:07:23,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:23,341 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615119702] [2020-12-23 00:07:23,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:23,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:23,466 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 00:07:23,467 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615119702] [2020-12-23 00:07:23,467 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924861737] [2020-12-23 00:07:23,467 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:23,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:23,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 00:07:23,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:23,599 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 00:07:23,600 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:23,600 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-23 00:07:23,600 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361863440] [2020-12-23 00:07:23,601 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 00:07:23,601 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:23,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 00:07:23,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:07:23,602 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 11 states. [2020-12-23 00:07:23,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:23,701 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2020-12-23 00:07:23,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 00:07:23,702 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2020-12-23 00:07:23,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:23,703 INFO L225 Difference]: With dead ends: 69 [2020-12-23 00:07:23,703 INFO L226 Difference]: Without dead ends: 46 [2020-12-23 00:07:23,704 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:07:23,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-23 00:07:23,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-12-23 00:07:23,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-23 00:07:23,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-12-23 00:07:23,715 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2020-12-23 00:07:23,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:23,715 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-12-23 00:07:23,715 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 00:07:23,715 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-12-23 00:07:23,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-23 00:07:23,718 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:23,718 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:23,934 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:07:23,935 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:23,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:23,936 INFO L82 PathProgramCache]: Analyzing trace with hash -1775699787, now seen corresponding path program 8 times [2020-12-23 00:07:23,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:23,937 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295753242] [2020-12-23 00:07:23,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:23,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:24,076 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-23 00:07:24,076 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295753242] [2020-12-23 00:07:24,077 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105687134] [2020-12-23 00:07:24,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:24,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:07:24,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:24,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 00:07:24,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:24,243 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-23 00:07:24,244 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:24,244 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 00:07:24,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216852421] [2020-12-23 00:07:24,245 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 00:07:24,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:24,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 00:07:24,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:07:24,246 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 12 states. [2020-12-23 00:07:24,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:24,362 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2020-12-23 00:07:24,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 00:07:24,363 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-12-23 00:07:24,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:24,364 INFO L225 Difference]: With dead ends: 75 [2020-12-23 00:07:24,364 INFO L226 Difference]: Without dead ends: 50 [2020-12-23 00:07:24,364 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:07:24,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-23 00:07:24,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2020-12-23 00:07:24,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-23 00:07:24,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-12-23 00:07:24,371 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 41 [2020-12-23 00:07:24,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:24,371 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-12-23 00:07:24,371 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 00:07:24,371 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-12-23 00:07:24,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-23 00:07:24,372 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:24,372 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:24,586 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-23 00:07:24,587 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:24,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:24,588 INFO L82 PathProgramCache]: Analyzing trace with hash -859403407, now seen corresponding path program 9 times [2020-12-23 00:07:24,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:24,589 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160364579] [2020-12-23 00:07:24,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:24,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:24,744 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-23 00:07:24,744 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160364579] [2020-12-23 00:07:24,745 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842835078] [2020-12-23 00:07:24,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:25,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-23 00:07:25,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:25,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 00:07:25,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:25,278 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-23 00:07:25,278 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:25,279 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-23 00:07:25,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780828719] [2020-12-23 00:07:25,282 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 00:07:25,282 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:25,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 00:07:25,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:07:25,288 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 13 states. [2020-12-23 00:07:25,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:25,389 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2020-12-23 00:07:25,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 00:07:25,390 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 45 [2020-12-23 00:07:25,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:25,391 INFO L225 Difference]: With dead ends: 81 [2020-12-23 00:07:25,391 INFO L226 Difference]: Without dead ends: 54 [2020-12-23 00:07:25,392 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:07:25,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-23 00:07:25,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2020-12-23 00:07:25,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-23 00:07:25,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-12-23 00:07:25,397 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 45 [2020-12-23 00:07:25,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:25,397 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-12-23 00:07:25,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 00:07:25,397 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-12-23 00:07:25,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-23 00:07:25,398 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:25,398 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:25,612 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:07:25,613 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:25,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:25,614 INFO L82 PathProgramCache]: Analyzing trace with hash 407457837, now seen corresponding path program 10 times [2020-12-23 00:07:25,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:25,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623486297] [2020-12-23 00:07:25,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:25,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:25,749 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 00:07:25,749 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623486297] [2020-12-23 00:07:25,749 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857041932] [2020-12-23 00:07:25,750 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:25,819 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:07:25,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:25,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-23 00:07:25,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:25,920 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 00:07:25,921 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:25,921 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-23 00:07:25,921 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350523616] [2020-12-23 00:07:25,921 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 00:07:25,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:25,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 00:07:25,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-23 00:07:25,923 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 14 states. [2020-12-23 00:07:26,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:26,022 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2020-12-23 00:07:26,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 00:07:26,023 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2020-12-23 00:07:26,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:26,024 INFO L225 Difference]: With dead ends: 87 [2020-12-23 00:07:26,024 INFO L226 Difference]: Without dead ends: 58 [2020-12-23 00:07:26,025 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-23 00:07:26,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-23 00:07:26,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2020-12-23 00:07:26,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-23 00:07:26,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-12-23 00:07:26,030 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2020-12-23 00:07:26,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:26,031 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-12-23 00:07:26,031 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 00:07:26,031 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-12-23 00:07:26,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-23 00:07:26,032 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:26,032 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:26,247 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:07:26,248 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:26,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:26,249 INFO L82 PathProgramCache]: Analyzing trace with hash -380877079, now seen corresponding path program 11 times [2020-12-23 00:07:26,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:26,250 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611195901] [2020-12-23 00:07:26,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:26,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:26,425 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-23 00:07:26,426 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611195901] [2020-12-23 00:07:26,426 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933291583] [2020-12-23 00:07:26,426 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:28,466 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-23 00:07:28,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:28,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 00:07:28,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:28,580 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-23 00:07:28,580 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:28,580 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-23 00:07:28,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131687264] [2020-12-23 00:07:28,581 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 00:07:28,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:28,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 00:07:28,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:07:28,582 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 15 states. [2020-12-23 00:07:28,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:28,695 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2020-12-23 00:07:28,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 00:07:28,695 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2020-12-23 00:07:28,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:28,697 INFO L225 Difference]: With dead ends: 93 [2020-12-23 00:07:28,697 INFO L226 Difference]: Without dead ends: 62 [2020-12-23 00:07:28,699 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:07:28,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-12-23 00:07:28,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2020-12-23 00:07:28,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-23 00:07:28,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-12-23 00:07:28,708 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 53 [2020-12-23 00:07:28,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:28,709 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-12-23 00:07:28,709 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 00:07:28,709 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-12-23 00:07:28,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-23 00:07:28,710 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:28,710 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:28,924 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 00:07:28,925 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:28,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:28,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1508536229, now seen corresponding path program 12 times [2020-12-23 00:07:28,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:28,926 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918936631] [2020-12-23 00:07:28,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:28,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:29,206 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-23 00:07:29,207 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918936631] [2020-12-23 00:07:29,207 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320343264] [2020-12-23 00:07:29,207 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:30,727 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-23 00:07:30,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:30,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 00:07:30,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:30,828 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-23 00:07:30,829 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:30,829 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-23 00:07:30,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735198785] [2020-12-23 00:07:30,829 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 00:07:30,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:30,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 00:07:30,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:07:30,831 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 16 states. [2020-12-23 00:07:30,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:30,945 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2020-12-23 00:07:30,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:07:30,946 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 57 [2020-12-23 00:07:30,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:30,947 INFO L225 Difference]: With dead ends: 99 [2020-12-23 00:07:30,947 INFO L226 Difference]: Without dead ends: 66 [2020-12-23 00:07:30,948 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:07:30,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-23 00:07:30,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2020-12-23 00:07:30,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-23 00:07:30,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-12-23 00:07:30,954 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 57 [2020-12-23 00:07:30,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:30,954 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-12-23 00:07:30,955 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 00:07:30,955 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-12-23 00:07:30,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-23 00:07:30,956 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:30,956 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:31,169 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 00:07:31,170 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:31,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:31,171 INFO L82 PathProgramCache]: Analyzing trace with hash -1380005279, now seen corresponding path program 13 times [2020-12-23 00:07:31,171 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:31,172 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994332035] [2020-12-23 00:07:31,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:31,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:31,368 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-23 00:07:31,368 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994332035] [2020-12-23 00:07:31,369 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638820697] [2020-12-23 00:07:31,369 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:31,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:31,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-23 00:07:31,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:31,551 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-23 00:07:31,552 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:31,552 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-23 00:07:31,552 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385981634] [2020-12-23 00:07:31,553 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 00:07:31,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:31,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 00:07:31,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:07:31,554 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 17 states. [2020-12-23 00:07:31,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:31,692 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2020-12-23 00:07:31,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 00:07:31,693 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 61 [2020-12-23 00:07:31,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:31,694 INFO L225 Difference]: With dead ends: 105 [2020-12-23 00:07:31,694 INFO L226 Difference]: Without dead ends: 70 [2020-12-23 00:07:31,694 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:07:31,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-12-23 00:07:31,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2020-12-23 00:07:31,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-23 00:07:31,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-23 00:07:31,700 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 61 [2020-12-23 00:07:31,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:31,700 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-23 00:07:31,700 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 00:07:31,701 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-23 00:07:31,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-23 00:07:31,702 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:31,702 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:31,908 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 00:07:31,909 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:31,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:31,910 INFO L82 PathProgramCache]: Analyzing trace with hash -773564643, now seen corresponding path program 14 times [2020-12-23 00:07:31,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:31,911 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796677831] [2020-12-23 00:07:31,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:31,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:32,124 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-23 00:07:32,124 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796677831] [2020-12-23 00:07:32,125 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87025392] [2020-12-23 00:07:32,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:32,196 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:07:32,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:32,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 00:07:32,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:32,271 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-23 00:07:32,272 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:32,272 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 00:07:32,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681824538] [2020-12-23 00:07:32,272 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 00:07:32,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:32,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 00:07:32,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:07:32,274 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 18 states. [2020-12-23 00:07:32,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:32,408 INFO L93 Difference]: Finished difference Result 111 states and 116 transitions. [2020-12-23 00:07:32,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-23 00:07:32,408 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 65 [2020-12-23 00:07:32,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:32,409 INFO L225 Difference]: With dead ends: 111 [2020-12-23 00:07:32,409 INFO L226 Difference]: Without dead ends: 74 [2020-12-23 00:07:32,410 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:07:32,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-12-23 00:07:32,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2020-12-23 00:07:32,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-12-23 00:07:32,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-12-23 00:07:32,415 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 65 [2020-12-23 00:07:32,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:32,416 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-12-23 00:07:32,416 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 00:07:32,416 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-12-23 00:07:32,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-12-23 00:07:32,417 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:32,417 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:32,630 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:07:32,631 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:32,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:32,632 INFO L82 PathProgramCache]: Analyzing trace with hash -587852327, now seen corresponding path program 15 times [2020-12-23 00:07:32,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:32,632 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878519679] [2020-12-23 00:07:32,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:32,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:32,883 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-23 00:07:32,883 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878519679] [2020-12-23 00:07:32,883 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684163933] [2020-12-23 00:07:32,883 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:37,687 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2020-12-23 00:07:37,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:37,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 00:07:37,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:37,792 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-23 00:07:37,792 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:37,792 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-23 00:07:37,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550876179] [2020-12-23 00:07:37,793 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 00:07:37,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:37,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 00:07:37,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:07:37,794 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 19 states. [2020-12-23 00:07:37,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:37,932 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2020-12-23 00:07:37,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 00:07:37,932 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 69 [2020-12-23 00:07:37,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:37,933 INFO L225 Difference]: With dead ends: 117 [2020-12-23 00:07:37,933 INFO L226 Difference]: Without dead ends: 78 [2020-12-23 00:07:37,934 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:07:37,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-12-23 00:07:37,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-12-23 00:07:37,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-23 00:07:37,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-12-23 00:07:37,940 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 69 [2020-12-23 00:07:37,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:37,940 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-12-23 00:07:37,940 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 00:07:37,940 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-12-23 00:07:37,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-23 00:07:37,941 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:37,941 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:38,156 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 00:07:38,157 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:38,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:38,158 INFO L82 PathProgramCache]: Analyzing trace with hash -1894840683, now seen corresponding path program 16 times [2020-12-23 00:07:38,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:38,158 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103148428] [2020-12-23 00:07:38,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:38,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:38,419 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-23 00:07:38,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103148428] [2020-12-23 00:07:38,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334863331] [2020-12-23 00:07:38,419 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:07:38,500 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:07:38,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:38,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-23 00:07:38,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:38,650 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-23 00:07:38,651 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:38,651 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-23 00:07:38,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808346423] [2020-12-23 00:07:38,652 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 00:07:38,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:38,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 00:07:38,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:07:38,656 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 20 states. [2020-12-23 00:07:38,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:38,789 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2020-12-23 00:07:38,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 00:07:38,790 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 73 [2020-12-23 00:07:38,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:38,791 INFO L225 Difference]: With dead ends: 123 [2020-12-23 00:07:38,791 INFO L226 Difference]: Without dead ends: 82 [2020-12-23 00:07:38,792 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:07:38,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-12-23 00:07:38,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2020-12-23 00:07:38,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-12-23 00:07:38,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-12-23 00:07:38,797 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 73 [2020-12-23 00:07:38,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:38,797 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-12-23 00:07:38,797 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 00:07:38,798 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-12-23 00:07:38,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-12-23 00:07:38,798 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:38,798 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:39,013 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 00:07:39,014 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:39,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:39,015 INFO L82 PathProgramCache]: Analyzing trace with hash -775280303, now seen corresponding path program 17 times [2020-12-23 00:07:39,015 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:39,015 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826516964] [2020-12-23 00:07:39,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:39,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:39,287 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2020-12-23 00:07:39,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826516964] [2020-12-23 00:07:39,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374001534] [2020-12-23 00:07:39,287 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:07:52,126 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2020-12-23 00:07:52,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:07:52,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 00:07:52,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:07:52,256 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2020-12-23 00:07:52,257 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:07:52,257 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-23 00:07:52,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112468376] [2020-12-23 00:07:52,258 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 00:07:52,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:07:52,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 00:07:52,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:07:52,259 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 21 states. [2020-12-23 00:07:52,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:07:52,410 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2020-12-23 00:07:52,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-23 00:07:52,411 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 77 [2020-12-23 00:07:52,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:07:52,411 INFO L225 Difference]: With dead ends: 129 [2020-12-23 00:07:52,411 INFO L226 Difference]: Without dead ends: 86 [2020-12-23 00:07:52,412 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:07:52,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-12-23 00:07:52,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2020-12-23 00:07:52,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-12-23 00:07:52,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-12-23 00:07:52,416 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 77 [2020-12-23 00:07:52,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:07:52,416 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-12-23 00:07:52,416 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 00:07:52,416 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-12-23 00:07:52,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-12-23 00:07:52,417 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:07:52,417 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:07:52,631 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 00:07:52,632 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:07:52,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:07:52,633 INFO L82 PathProgramCache]: Analyzing trace with hash 943881741, now seen corresponding path program 18 times [2020-12-23 00:07:52,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:07:52,633 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923661439] [2020-12-23 00:07:52,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:07:52,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:07:52,901 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2020-12-23 00:07:52,901 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923661439] [2020-12-23 00:07:52,901 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727875819] [2020-12-23 00:07:52,901 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:08:14,047 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-12-23 00:08:14,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:08:14,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-23 00:08:14,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:08:14,247 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2020-12-23 00:08:14,248 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:08:14,248 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-23 00:08:14,248 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385746469] [2020-12-23 00:08:14,250 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-23 00:08:14,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:08:14,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-23 00:08:14,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-23 00:08:14,251 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 22 states. [2020-12-23 00:08:14,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:08:14,390 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2020-12-23 00:08:14,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-23 00:08:14,391 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 81 [2020-12-23 00:08:14,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:08:14,394 INFO L225 Difference]: With dead ends: 135 [2020-12-23 00:08:14,395 INFO L226 Difference]: Without dead ends: 90 [2020-12-23 00:08:14,395 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-23 00:08:14,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-12-23 00:08:14,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2020-12-23 00:08:14,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-12-23 00:08:14,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-12-23 00:08:14,401 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 81 [2020-12-23 00:08:14,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:08:14,402 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-12-23 00:08:14,402 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-23 00:08:14,402 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-12-23 00:08:14,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-12-23 00:08:14,403 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:08:14,403 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:08:14,617 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:08:14,618 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:08:14,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:08:14,618 INFO L82 PathProgramCache]: Analyzing trace with hash 2131952841, now seen corresponding path program 19 times [2020-12-23 00:08:14,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:08:14,619 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555728696] [2020-12-23 00:08:14,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:08:14,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:08:14,938 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2020-12-23 00:08:14,938 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555728696] [2020-12-23 00:08:14,938 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976499914] [2020-12-23 00:08:14,938 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:08:15,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:08:15,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-23 00:08:15,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:08:15,150 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2020-12-23 00:08:15,151 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:08:15,151 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-23 00:08:15,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338955375] [2020-12-23 00:08:15,153 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-23 00:08:15,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:08:15,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-23 00:08:15,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-23 00:08:15,154 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 23 states. [2020-12-23 00:08:15,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:08:15,328 INFO L93 Difference]: Finished difference Result 141 states and 146 transitions. [2020-12-23 00:08:15,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-23 00:08:15,329 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-12-23 00:08:15,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:08:15,330 INFO L225 Difference]: With dead ends: 141 [2020-12-23 00:08:15,330 INFO L226 Difference]: Without dead ends: 94 [2020-12-23 00:08:15,331 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-23 00:08:15,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-12-23 00:08:15,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2020-12-23 00:08:15,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-12-23 00:08:15,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-12-23 00:08:15,337 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 85 [2020-12-23 00:08:15,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:08:15,337 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-12-23 00:08:15,337 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-23 00:08:15,338 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-12-23 00:08:15,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-12-23 00:08:15,338 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:08:15,339 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:08:15,551 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:08:15,551 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:08:15,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:08:15,552 INFO L82 PathProgramCache]: Analyzing trace with hash 207011205, now seen corresponding path program 20 times [2020-12-23 00:08:15,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:08:15,553 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388689699] [2020-12-23 00:08:15,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:08:15,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:08:15,928 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2020-12-23 00:08:15,928 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388689699] [2020-12-23 00:08:15,928 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91196468] [2020-12-23 00:08:15,929 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:08:16,059 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:08:16,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:08:16,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-23 00:08:16,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:08:16,217 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2020-12-23 00:08:16,217 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:08:16,217 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-23 00:08:16,218 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358133106] [2020-12-23 00:08:16,220 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 00:08:16,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:08:16,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 00:08:16,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:08:16,221 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 24 states. [2020-12-23 00:08:16,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:08:16,398 INFO L93 Difference]: Finished difference Result 147 states and 152 transitions. [2020-12-23 00:08:16,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-23 00:08:16,399 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 89 [2020-12-23 00:08:16,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:08:16,400 INFO L225 Difference]: With dead ends: 147 [2020-12-23 00:08:16,400 INFO L226 Difference]: Without dead ends: 98 [2020-12-23 00:08:16,401 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:08:16,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-12-23 00:08:16,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96. [2020-12-23 00:08:16,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-12-23 00:08:16,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 98 transitions. [2020-12-23 00:08:16,406 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 98 transitions. Word has length 89 [2020-12-23 00:08:16,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:08:16,406 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 98 transitions. [2020-12-23 00:08:16,407 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 00:08:16,407 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 98 transitions. [2020-12-23 00:08:16,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-12-23 00:08:16,408 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:08:16,408 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:08:16,621 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-23 00:08:16,621 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:08:16,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:08:16,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1873324097, now seen corresponding path program 21 times [2020-12-23 00:08:16,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:08:16,622 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352803784] [2020-12-23 00:08:16,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:08:16,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:08:17,031 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2020-12-23 00:08:17,031 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352803784] [2020-12-23 00:08:17,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688634477] [2020-12-23 00:08:17,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:08:53,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2020-12-23 00:08:53,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:08:53,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-23 00:08:53,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:08:54,076 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2020-12-23 00:08:54,076 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:08:54,077 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-23 00:08:54,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503780060] [2020-12-23 00:08:54,077 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-23 00:08:54,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:08:54,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-23 00:08:54,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-23 00:08:54,079 INFO L87 Difference]: Start difference. First operand 96 states and 98 transitions. Second operand 25 states. [2020-12-23 00:08:54,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:08:54,233 INFO L93 Difference]: Finished difference Result 153 states and 158 transitions. [2020-12-23 00:08:54,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-23 00:08:54,235 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 93 [2020-12-23 00:08:54,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:08:54,236 INFO L225 Difference]: With dead ends: 153 [2020-12-23 00:08:54,236 INFO L226 Difference]: Without dead ends: 102 [2020-12-23 00:08:54,237 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-23 00:08:54,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-12-23 00:08:54,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2020-12-23 00:08:54,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-12-23 00:08:54,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2020-12-23 00:08:54,241 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 93 [2020-12-23 00:08:54,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:08:54,241 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2020-12-23 00:08:54,241 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-23 00:08:54,241 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2020-12-23 00:08:54,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-12-23 00:08:54,242 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:08:54,243 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:08:54,443 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-23 00:08:54,444 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:08:54,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:08:54,445 INFO L82 PathProgramCache]: Analyzing trace with hash -500972291, now seen corresponding path program 22 times [2020-12-23 00:08:54,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:08:54,445 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229941732] [2020-12-23 00:08:54,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:08:54,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:08:54,859 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-12-23 00:08:54,859 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229941732] [2020-12-23 00:08:54,859 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026023743] [2020-12-23 00:08:54,859 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:08:54,960 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:08:54,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:08:54,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-23 00:08:54,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:08:55,082 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-12-23 00:08:55,082 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:08:55,082 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-23 00:08:55,083 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224860862] [2020-12-23 00:08:55,084 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-23 00:08:55,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:08:55,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-23 00:08:55,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-23 00:08:55,085 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand 26 states. [2020-12-23 00:08:55,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:08:55,262 INFO L93 Difference]: Finished difference Result 159 states and 164 transitions. [2020-12-23 00:08:55,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-23 00:08:55,263 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 97 [2020-12-23 00:08:55,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:08:55,264 INFO L225 Difference]: With dead ends: 159 [2020-12-23 00:08:55,264 INFO L226 Difference]: Without dead ends: 106 [2020-12-23 00:08:55,265 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-23 00:08:55,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-12-23 00:08:55,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2020-12-23 00:08:55,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-12-23 00:08:55,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2020-12-23 00:08:55,271 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 97 [2020-12-23 00:08:55,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:08:55,272 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2020-12-23 00:08:55,272 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-23 00:08:55,272 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2020-12-23 00:08:55,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-12-23 00:08:55,273 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:08:55,273 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:08:55,487 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:08:55,488 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:08:55,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:08:55,488 INFO L82 PathProgramCache]: Analyzing trace with hash -966585415, now seen corresponding path program 23 times [2020-12-23 00:08:55,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:08:55,489 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996500672] [2020-12-23 00:08:55,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:08:55,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:08:55,913 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-12-23 00:08:55,913 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996500672] [2020-12-23 00:08:55,913 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823359745] [2020-12-23 00:08:55,913 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:10:51,487 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2020-12-23 00:10:51,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:10:51,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 25 conjunts are in the unsatisfiable core [2020-12-23 00:10:51,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:10:51,725 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-12-23 00:10:51,725 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:10:51,725 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2020-12-23 00:10:51,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681565598] [2020-12-23 00:10:51,726 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-23 00:10:51,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:10:51,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-23 00:10:51,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-23 00:10:51,727 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 27 states. [2020-12-23 00:10:51,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:10:51,948 INFO L93 Difference]: Finished difference Result 165 states and 170 transitions. [2020-12-23 00:10:51,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-23 00:10:51,948 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 101 [2020-12-23 00:10:51,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:10:51,949 INFO L225 Difference]: With dead ends: 165 [2020-12-23 00:10:51,949 INFO L226 Difference]: Without dead ends: 110 [2020-12-23 00:10:51,950 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-23 00:10:51,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-12-23 00:10:51,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2020-12-23 00:10:51,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-12-23 00:10:51,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2020-12-23 00:10:51,955 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 101 [2020-12-23 00:10:51,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:10:51,956 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2020-12-23 00:10:51,956 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-23 00:10:51,956 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2020-12-23 00:10:51,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-12-23 00:10:51,957 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:10:51,957 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:10:52,158 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-23 00:10:52,158 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:10:52,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:10:52,159 INFO L82 PathProgramCache]: Analyzing trace with hash 679580789, now seen corresponding path program 24 times [2020-12-23 00:10:52,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:10:52,160 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582927837] [2020-12-23 00:10:52,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:10:52,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:10:52,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 576 trivial. 0 not checked. [2020-12-23 00:10:52,640 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582927837] [2020-12-23 00:10:52,640 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329267664] [2020-12-23 00:10:52,640 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true