/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_two_index_03.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 00:12:07,164 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 00:12:07,167 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 00:12:07,207 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 00:12:07,208 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 00:12:07,210 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 00:12:07,212 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 00:12:07,214 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 00:12:07,217 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 00:12:07,230 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 00:12:07,236 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 00:12:07,237 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 00:12:07,239 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 00:12:07,247 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 00:12:07,249 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 00:12:07,250 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 00:12:07,251 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 00:12:07,255 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 00:12:07,260 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 00:12:07,267 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 00:12:07,273 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 00:12:07,276 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 00:12:07,279 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 00:12:07,281 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 00:12:07,288 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 00:12:07,306 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 00:12:07,307 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 00:12:07,308 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 00:12:07,310 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 00:12:07,379 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 00:12:07,379 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 00:12:07,385 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 00:12:07,385 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 00:12:07,385 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 00:12:07,386 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 00:12:07,386 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 00:12:07,386 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 00:12:07,386 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 00:12:07,386 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 00:12:07,388 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 00:12:07,388 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 00:12:07,388 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 00:12:07,388 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 00:12:07,389 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 00:12:07,389 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 00:12:07,389 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 00:12:07,389 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 00:12:07,389 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 00:12:07,390 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 00:12:07,390 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 00:12:07,390 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 00:12:07,390 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 00:12:07,390 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 00:12:07,391 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 00:12:07,391 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 00:12:07,874 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 00:12:07,913 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 00:12:07,917 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 00:12:07,919 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 00:12:07,920 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 00:12:07,921 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_03.i [2020-12-23 00:12:08,032 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/8aa8e7d40/ecf6a79244cf43b0b4757634bfe4549f/FLAG187fda182 [2020-12-23 00:12:08,827 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 00:12:08,830 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_03.i [2020-12-23 00:12:08,838 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/8aa8e7d40/ecf6a79244cf43b0b4757634bfe4549f/FLAG187fda182 [2020-12-23 00:12:09,144 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/8aa8e7d40/ecf6a79244cf43b0b4757634bfe4549f [2020-12-23 00:12:09,148 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 00:12:09,151 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 00:12:09,154 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 00:12:09,154 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 00:12:09,161 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 00:12:09,162 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,165 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@304d3aa8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09, skipping insertion in model container [2020-12-23 00:12:09,165 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,176 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 00:12:09,200 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 00:12:09,412 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_two_index_03.i[814,827] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~b~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~j~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2020-12-23 00:12:09,434 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:12:09,445 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 00:12:09,462 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_two_index_03.i[814,827] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#b~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#b~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: 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[~j~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2020-12-23 00:12:09,472 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:12:09,490 INFO L208 MainTranslator]: Completed translation [2020-12-23 00:12:09,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09 WrapperNode [2020-12-23 00:12:09,491 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 00:12:09,492 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 00:12:09,493 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 00:12:09,493 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 00:12:09,503 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,511 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,533 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 00:12:09,534 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 00:12:09,534 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 00:12:09,535 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 00:12:09,545 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,545 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,548 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,548 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,556 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,563 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,565 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,567 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 00:12:09,569 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 00:12:09,569 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 00:12:09,569 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 00:12:09,570 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (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 00:12:09,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 00:12:09,678 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 00:12:09,678 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 00:12:09,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 00:12:09,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 00:12:09,679 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 00:12:09,679 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 00:12:10,216 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 00:12:10,216 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 00:12:10,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:12:10 BoogieIcfgContainer [2020-12-23 00:12:10,218 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 00:12:10,220 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 00:12:10,220 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 00:12:10,223 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 00:12:10,224 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 12:12:09" (1/3) ... [2020-12-23 00:12:10,224 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@493e26b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:12:10, skipping insertion in model container [2020-12-23 00:12:10,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (2/3) ... [2020-12-23 00:12:10,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@493e26b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:12:10, skipping insertion in model container [2020-12-23 00:12:10,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:12:10" (3/3) ... [2020-12-23 00:12:10,227 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_03.i [2020-12-23 00:12:10,234 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 00:12:10,238 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 00:12:10,259 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 00:12:10,288 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 00:12:10,288 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 00:12:10,289 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 00:12:10,289 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 00:12:10,289 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 00:12:10,289 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 00:12:10,289 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 00:12:10,289 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 00:12:10,327 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-12-23 00:12:10,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 00:12:10,340 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:10,341 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:10,342 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:10,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:10,350 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2020-12-23 00:12:10,370 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:10,371 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902501946] [2020-12-23 00:12:10,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:10,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:10,635 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 00:12:10,637 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902501946] [2020-12-23 00:12:10,638 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:12:10,638 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 00:12:10,639 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84999115] [2020-12-23 00:12:10,644 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:12:10,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:10,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:12:10,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:12:10,674 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2020-12-23 00:12:10,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:10,764 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2020-12-23 00:12:10,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:12:10,766 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-23 00:12:10,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:10,792 INFO L225 Difference]: With dead ends: 28 [2020-12-23 00:12:10,792 INFO L226 Difference]: Without dead ends: 12 [2020-12-23 00:12:10,802 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 00:12:10,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-23 00:12:10,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-23 00:12:10,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-23 00:12:10,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2020-12-23 00:12:10,869 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2020-12-23 00:12:10,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:10,870 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2020-12-23 00:12:10,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:12:10,870 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2020-12-23 00:12:10,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 00:12:10,871 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:10,871 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:10,872 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 00:12:10,872 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:10,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:10,873 INFO L82 PathProgramCache]: Analyzing trace with hash 722375763, now seen corresponding path program 1 times [2020-12-23 00:12:10,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:10,874 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335742211] [2020-12-23 00:12:10,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:10,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:10,930 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 00:12:10,930 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335742211] [2020-12-23 00:12:10,931 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395841389] [2020-12-23 00:12:10,931 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 00:12:11,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:11,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-23 00:12:11,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:11,048 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:12:11,048 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-23 00:12:11,049 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2020-12-23 00:12:11,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016825821] [2020-12-23 00:12:11,051 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:12:11,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:11,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:12:11,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 00:12:11,053 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 3 states. [2020-12-23 00:12:11,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:11,080 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-12-23 00:12:11,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:12:11,081 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-12-23 00:12:11,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:11,082 INFO L225 Difference]: With dead ends: 24 [2020-12-23 00:12:11,082 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 00:12:11,084 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 00:12:11,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 00:12:11,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2020-12-23 00:12:11,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-23 00:12:11,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-12-23 00:12:11,088 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2020-12-23 00:12:11,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:11,089 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-12-23 00:12:11,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:12:11,089 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-12-23 00:12:11,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 00:12:11,090 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:11,090 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:11,304 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 00:12:11,304 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:11,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:11,306 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2020-12-23 00:12:11,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:11,307 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208511189] [2020-12-23 00:12:11,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:11,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:11,392 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 00:12:11,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208511189] [2020-12-23 00:12:11,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526079703] [2020-12-23 00:12:11,393 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 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 00:12:11,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:11,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 00:12:11,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:11,520 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 00:12:11,520 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:11,520 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 00:12:11,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943715410] [2020-12-23 00:12:11,521 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 00:12:11,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:11,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 00:12:11,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:12:11,523 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 5 states. [2020-12-23 00:12:11,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:11,556 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2020-12-23 00:12:11,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 00:12:11,557 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-23 00:12:11,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:11,558 INFO L225 Difference]: With dead ends: 28 [2020-12-23 00:12:11,559 INFO L226 Difference]: Without dead ends: 19 [2020-12-23 00:12:11,559 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:12:11,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-23 00:12:11,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2020-12-23 00:12:11,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-23 00:12:11,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-12-23 00:12:11,564 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2020-12-23 00:12:11,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:11,565 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-12-23 00:12:11,565 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 00:12:11,565 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-12-23 00:12:11,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 00:12:11,566 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:11,566 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:11,779 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:11,780 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:11,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:11,782 INFO L82 PathProgramCache]: Analyzing trace with hash -519784366, now seen corresponding path program 2 times [2020-12-23 00:12:11,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:11,783 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918987102] [2020-12-23 00:12:11,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:11,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:11,836 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-23 00:12:11,837 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918987102] [2020-12-23 00:12:11,837 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [578989149] [2020-12-23 00:12:11,837 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 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 00:12:11,906 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:11,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:11,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:12:11,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:11,951 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:12:11,952 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:11,952 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2020-12-23 00:12:11,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968291880] [2020-12-23 00:12:11,953 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 00:12:11,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:11,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 00:12:11,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:12:11,955 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 7 states. [2020-12-23 00:12:12,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:12,005 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2020-12-23 00:12:12,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 00:12:12,006 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-12-23 00:12:12,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:12,007 INFO L225 Difference]: With dead ends: 36 [2020-12-23 00:12:12,007 INFO L226 Difference]: Without dead ends: 27 [2020-12-23 00:12:12,008 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:12:12,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-23 00:12:12,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 17. [2020-12-23 00:12:12,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 00:12:12,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-23 00:12:12,013 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-12-23 00:12:12,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:12,014 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-23 00:12:12,014 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 00:12:12,014 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-23 00:12:12,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 00:12:12,015 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:12,015 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:12,228 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:12,229 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:12,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:12,231 INFO L82 PathProgramCache]: Analyzing trace with hash -1963781416, now seen corresponding path program 3 times [2020-12-23 00:12:12,231 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:12,232 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614318019] [2020-12-23 00:12:12,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:12,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:12,340 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:12,340 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614318019] [2020-12-23 00:12:12,341 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118978692] [2020-12-23 00:12:12,344 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 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 00:12:12,415 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-23 00:12:12,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:12,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:12:12,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:12,450 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:12,451 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:12,451 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 00:12:12,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722014236] [2020-12-23 00:12:12,452 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 00:12:12,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:12,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 00:12:12,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:12:12,454 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-12-23 00:12:12,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:12,518 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2020-12-23 00:12:12,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 00:12:12,519 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-12-23 00:12:12,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:12,522 INFO L225 Difference]: With dead ends: 39 [2020-12-23 00:12:12,522 INFO L226 Difference]: Without dead ends: 33 [2020-12-23 00:12:12,523 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 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 00:12:12,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-23 00:12:12,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 18. [2020-12-23 00:12:12,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-23 00:12:12,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-23 00:12:12,540 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-12-23 00:12:12,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:12,541 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-23 00:12:12,541 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 00:12:12,541 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-23 00:12:12,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 00:12:12,543 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:12,544 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:12,756 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:12,757 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:12,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:12,758 INFO L82 PathProgramCache]: Analyzing trace with hash -696235598, now seen corresponding path program 4 times [2020-12-23 00:12:12,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:12,760 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902965404] [2020-12-23 00:12:12,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:12,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:12,822 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:12,823 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902965404] [2020-12-23 00:12:12,823 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206298381] [2020-12-23 00:12:12,823 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 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 00:12:12,872 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:12:12,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:12,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 00:12:12,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:12,965 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:12:12,970 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:12,972 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2020-12-23 00:12:12,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521956732] [2020-12-23 00:12:12,973 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 00:12:12,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:12,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 00:12:12,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=46, Unknown=0, NotChecked=0, Total=90 [2020-12-23 00:12:12,975 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 10 states. [2020-12-23 00:12:13,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:13,064 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2020-12-23 00:12:13,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 00:12:13,064 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2020-12-23 00:12:13,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:13,065 INFO L225 Difference]: With dead ends: 53 [2020-12-23 00:12:13,065 INFO L226 Difference]: Without dead ends: 42 [2020-12-23 00:12:13,066 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=44, Invalid=46, Unknown=0, NotChecked=0, Total=90 [2020-12-23 00:12:13,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-23 00:12:13,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 22. [2020-12-23 00:12:13,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-23 00:12:13,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-12-23 00:12:13,071 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 16 [2020-12-23 00:12:13,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:13,071 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-12-23 00:12:13,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 00:12:13,072 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-12-23 00:12:13,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-23 00:12:13,072 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:13,073 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:13,286 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 00:12:13,287 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:13,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:13,288 INFO L82 PathProgramCache]: Analyzing trace with hash -1213738189, now seen corresponding path program 5 times [2020-12-23 00:12:13,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:13,289 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225947854] [2020-12-23 00:12:13,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:13,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:13,416 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-23 00:12:13,416 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225947854] [2020-12-23 00:12:13,417 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621597856] [2020-12-23 00:12:13,417 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 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 00:12:13,556 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-12-23 00:12:13,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:13,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 00:12:13,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:13,658 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:13,658 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:13,659 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 13 [2020-12-23 00:12:13,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264417069] [2020-12-23 00:12:13,659 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 00:12:13,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:13,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 00:12:13,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=79, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:12:13,661 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 13 states. [2020-12-23 00:12:13,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:13,765 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2020-12-23 00:12:13,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 00:12:13,766 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-12-23 00:12:13,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:13,767 INFO L225 Difference]: With dead ends: 63 [2020-12-23 00:12:13,768 INFO L226 Difference]: Without dead ends: 51 [2020-12-23 00:12:13,769 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=77, Invalid=79, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:12:13,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-23 00:12:13,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 26. [2020-12-23 00:12:13,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-23 00:12:13,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-12-23 00:12:13,775 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 20 [2020-12-23 00:12:13,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:13,775 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-12-23 00:12:13,775 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 00:12:13,775 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-12-23 00:12:13,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-23 00:12:13,776 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:13,776 INFO L422 BasicCegarLoop]: trace histogram [10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:13,990 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:13,991 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:13,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:13,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1232303186, now seen corresponding path program 6 times [2020-12-23 00:12:13,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:13,993 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495625232] [2020-12-23 00:12:13,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:14,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:14,145 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-23 00:12:14,146 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495625232] [2020-12-23 00:12:14,146 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948897941] [2020-12-23 00:12:14,146 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 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 00:12:14,339 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2020-12-23 00:12:14,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:14,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 00:12:14,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:14,395 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-23 00:12:14,395 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:14,395 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 00:12:14,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459775212] [2020-12-23 00:12:14,396 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 00:12:14,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:14,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 00:12:14,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:12:14,398 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-12-23 00:12:14,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:14,495 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2020-12-23 00:12:14,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 00:12:14,496 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-12-23 00:12:14,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:14,497 INFO L225 Difference]: With dead ends: 63 [2020-12-23 00:12:14,497 INFO L226 Difference]: Without dead ends: 57 [2020-12-23 00:12:14,498 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 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 00:12:14,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-12-23 00:12:14,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 27. [2020-12-23 00:12:14,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-23 00:12:14,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-12-23 00:12:14,504 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 24 [2020-12-23 00:12:14,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:14,505 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-12-23 00:12:14,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 00:12:14,505 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-12-23 00:12:14,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-23 00:12:14,506 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:14,506 INFO L422 BasicCegarLoop]: trace histogram [10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:14,716 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:14,717 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:14,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:14,718 INFO L82 PathProgramCache]: Analyzing trace with hash -401860744, now seen corresponding path program 7 times [2020-12-23 00:12:14,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:14,719 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786328260] [2020-12-23 00:12:14,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:14,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:14,850 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-23 00:12:14,850 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786328260] [2020-12-23 00:12:14,851 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830764390] [2020-12-23 00:12:14,851 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 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 00:12:14,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:14,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-23 00:12:14,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:15,069 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-23 00:12:15,070 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:15,070 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 17 [2020-12-23 00:12:15,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033537890] [2020-12-23 00:12:15,071 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 00:12:15,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:15,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 00:12:15,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=137, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:12:15,072 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 17 states. [2020-12-23 00:12:15,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:15,173 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2020-12-23 00:12:15,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-23 00:12:15,173 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 25 [2020-12-23 00:12:15,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:15,174 INFO L225 Difference]: With dead ends: 81 [2020-12-23 00:12:15,174 INFO L226 Difference]: Without dead ends: 67 [2020-12-23 00:12:15,176 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=135, Invalid=137, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:12:15,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-23 00:12:15,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 32. [2020-12-23 00:12:15,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-23 00:12:15,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-12-23 00:12:15,191 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 25 [2020-12-23 00:12:15,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:15,191 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-12-23 00:12:15,191 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 00:12:15,192 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-12-23 00:12:15,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-23 00:12:15,192 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:15,192 INFO L422 BasicCegarLoop]: trace histogram [14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:15,394 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-23 00:12:15,395 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:15,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:15,396 INFO L82 PathProgramCache]: Analyzing trace with hash -734025134, now seen corresponding path program 8 times [2020-12-23 00:12:15,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:15,397 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868633458] [2020-12-23 00:12:15,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:15,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:15,584 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-23 00:12:15,584 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868633458] [2020-12-23 00:12:15,585 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149726924] [2020-12-23 00:12:15,585 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 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 00:12:15,666 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:15,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:15,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 00:12:15,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:15,897 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-23 00:12:15,898 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:15,898 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 17] total 21 [2020-12-23 00:12:15,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292859563] [2020-12-23 00:12:15,899 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 00:12:15,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:15,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 00:12:15,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:12:15,900 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 21 states. [2020-12-23 00:12:16,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:16,032 INFO L93 Difference]: Finished difference Result 92 states and 100 transitions. [2020-12-23 00:12:16,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-23 00:12:16,032 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 30 [2020-12-23 00:12:16,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:16,033 INFO L225 Difference]: With dead ends: 92 [2020-12-23 00:12:16,033 INFO L226 Difference]: Without dead ends: 77 [2020-12-23 00:12:16,034 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:12:16,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-12-23 00:12:16,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 37. [2020-12-23 00:12:16,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-23 00:12:16,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-12-23 00:12:16,041 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 30 [2020-12-23 00:12:16,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:16,041 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-12-23 00:12:16,041 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 00:12:16,041 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-12-23 00:12:16,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-23 00:12:16,042 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:16,042 INFO L422 BasicCegarLoop]: trace histogram [18, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:16,257 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:16,258 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:16,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:16,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1266653240, now seen corresponding path program 9 times [2020-12-23 00:12:16,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:16,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489806457] [2020-12-23 00:12:16,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:16,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:16,397 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-23 00:12:16,398 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489806457] [2020-12-23 00:12:16,398 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735013061] [2020-12-23 00:12:16,398 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 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 00:12:16,600 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-23 00:12:16,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:16,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 00:12:16,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:16,664 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-23 00:12:16,664 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:16,664 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 00:12:16,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856234056] [2020-12-23 00:12:16,666 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 00:12:16,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:16,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 00:12:16,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:12:16,668 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 12 states. [2020-12-23 00:12:16,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:16,756 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2020-12-23 00:12:16,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 00:12:16,757 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2020-12-23 00:12:16,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:16,758 INFO L225 Difference]: With dead ends: 89 [2020-12-23 00:12:16,758 INFO L226 Difference]: Without dead ends: 83 [2020-12-23 00:12:16,758 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 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 00:12:16,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-12-23 00:12:16,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 38. [2020-12-23 00:12:16,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-23 00:12:16,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-12-23 00:12:16,765 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-12-23 00:12:16,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:16,765 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-12-23 00:12:16,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 00:12:16,766 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-12-23 00:12:16,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:12:16,767 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:16,767 INFO L422 BasicCegarLoop]: trace histogram [18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:16,980 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:16,981 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:16,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:16,982 INFO L82 PathProgramCache]: Analyzing trace with hash 662990930, now seen corresponding path program 10 times [2020-12-23 00:12:16,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:16,983 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756410368] [2020-12-23 00:12:16,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:17,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:17,109 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-23 00:12:17,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756410368] [2020-12-23 00:12:17,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073216789] [2020-12-23 00:12:17,110 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 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 00:12:17,210 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:12:17,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:17,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-23 00:12:17,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:17,412 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-23 00:12:17,413 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:17,413 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 21] total 26 [2020-12-23 00:12:17,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852697829] [2020-12-23 00:12:17,414 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-23 00:12:17,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:17,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-23 00:12:17,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=326, Unknown=0, NotChecked=0, Total=650 [2020-12-23 00:12:17,415 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 26 states. [2020-12-23 00:12:17,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:17,560 INFO L93 Difference]: Finished difference Result 111 states and 120 transitions. [2020-12-23 00:12:17,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-23 00:12:17,560 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 36 [2020-12-23 00:12:17,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:17,562 INFO L225 Difference]: With dead ends: 111 [2020-12-23 00:12:17,563 INFO L226 Difference]: Without dead ends: 94 [2020-12-23 00:12:17,565 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=324, Invalid=326, Unknown=0, NotChecked=0, Total=650 [2020-12-23 00:12:17,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-12-23 00:12:17,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 44. [2020-12-23 00:12:17,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-23 00:12:17,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-12-23 00:12:17,579 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2020-12-23 00:12:17,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:17,580 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-12-23 00:12:17,580 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-23 00:12:17,580 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-12-23 00:12:17,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-12-23 00:12:17,584 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:17,584 INFO L422 BasicCegarLoop]: trace histogram [23, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:17,785 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 00:12:17,785 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:17,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:17,786 INFO L82 PathProgramCache]: Analyzing trace with hash -409368141, now seen corresponding path program 11 times [2020-12-23 00:12:17,786 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:17,787 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424134797] [2020-12-23 00:12:17,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:17,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:17,961 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2020-12-23 00:12:17,961 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424134797] [2020-12-23 00:12:17,961 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498709895] [2020-12-23 00:12:17,962 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 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 00:12:42,301 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2020-12-23 00:12:42,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:42,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 25 conjunts are in the unsatisfiable core [2020-12-23 00:12:42,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:42,620 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-23 00:12:42,621 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:42,621 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 26] total 30 [2020-12-23 00:12:42,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685240237] [2020-12-23 00:12:42,622 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-23 00:12:42,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:42,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-23 00:12:42,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=436, Unknown=0, NotChecked=0, Total=870 [2020-12-23 00:12:42,624 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 30 states. [2020-12-23 00:12:42,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:42,798 INFO L93 Difference]: Finished difference Result 122 states and 130 transitions. [2020-12-23 00:12:42,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-12-23 00:12:42,799 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 42 [2020-12-23 00:12:42,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:42,800 INFO L225 Difference]: With dead ends: 122 [2020-12-23 00:12:42,800 INFO L226 Difference]: Without dead ends: 104 [2020-12-23 00:12:42,801 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=434, Invalid=436, Unknown=0, NotChecked=0, Total=870 [2020-12-23 00:12:42,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-12-23 00:12:42,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 49. [2020-12-23 00:12:42,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-23 00:12:42,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2020-12-23 00:12:42,807 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 42 [2020-12-23 00:12:42,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:42,808 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2020-12-23 00:12:42,808 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-23 00:12:42,808 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2020-12-23 00:12:42,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:12:42,809 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:42,809 INFO L422 BasicCegarLoop]: trace histogram [27, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:43,015 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 00:12:43,015 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:43,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:43,017 INFO L82 PathProgramCache]: Analyzing trace with hash 434472183, now seen corresponding path program 12 times [2020-12-23 00:12:43,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:43,017 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394407184] [2020-12-23 00:12:43,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:43,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:43,219 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2020-12-23 00:12:43,223 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394407184] [2020-12-23 00:12:43,223 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547432550] [2020-12-23 00:12:43,223 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 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 00:12:56,533 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-23 00:12:56,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:56,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 00:12:56,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:56,631 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2020-12-23 00:12:56,631 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:56,632 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-23 00:12:56,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818102534] [2020-12-23 00:12:56,632 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 00:12:56,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:56,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 00:12:56,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:12:56,635 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 15 states. [2020-12-23 00:12:56,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:56,739 INFO L93 Difference]: Finished difference Result 116 states and 119 transitions. [2020-12-23 00:12:56,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:12:56,740 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2020-12-23 00:12:56,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:56,741 INFO L225 Difference]: With dead ends: 116 [2020-12-23 00:12:56,741 INFO L226 Difference]: Without dead ends: 110 [2020-12-23 00:12:56,742 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 47 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 00:12:56,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-12-23 00:12:56,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 50. [2020-12-23 00:12:56,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-23 00:12:56,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-12-23 00:12:56,763 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-12-23 00:12:56,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:56,764 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-12-23 00:12:56,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 00:12:56,765 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-12-23 00:12:56,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-23 00:12:56,771 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:56,771 INFO L422 BasicCegarLoop]: trace histogram [27, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:56,986 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 00:12:56,987 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:56,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:56,988 INFO L82 PathProgramCache]: Analyzing trace with hash 635181939, now seen corresponding path program 13 times [2020-12-23 00:12:56,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:56,989 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235625157] [2020-12-23 00:12:56,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:57,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:57,193 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2020-12-23 00:12:57,194 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235625157] [2020-12-23 00:12:57,194 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135406235] [2020-12-23 00:12:57,194 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 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 00:12:57,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:57,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 29 conjunts are in the unsatisfiable core [2020-12-23 00:12:57,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:57,580 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:12:57,581 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:57,581 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 30] total 35 [2020-12-23 00:12:57,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123926671] [2020-12-23 00:12:57,582 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-12-23 00:12:57,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:57,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-12-23 00:12:57,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=596, Unknown=0, NotChecked=0, Total=1190 [2020-12-23 00:12:57,584 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 35 states. [2020-12-23 00:12:57,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:57,775 INFO L93 Difference]: Finished difference Result 141 states and 150 transitions. [2020-12-23 00:12:57,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-12-23 00:12:57,776 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 48 [2020-12-23 00:12:57,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:57,778 INFO L225 Difference]: With dead ends: 141 [2020-12-23 00:12:57,778 INFO L226 Difference]: Without dead ends: 121 [2020-12-23 00:12:57,783 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=594, Invalid=596, Unknown=0, NotChecked=0, Total=1190 [2020-12-23 00:12:57,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-12-23 00:12:57,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 56. [2020-12-23 00:12:57,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-23 00:12:57,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-12-23 00:12:57,793 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 48 [2020-12-23 00:12:57,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:57,793 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-12-23 00:12:57,793 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-12-23 00:12:57,793 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-12-23 00:12:57,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-12-23 00:12:57,795 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:57,795 INFO L422 BasicCegarLoop]: trace histogram [32, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:58,007 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:58,008 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:58,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:58,009 INFO L82 PathProgramCache]: Analyzing trace with hash 796181042, now seen corresponding path program 14 times [2020-12-23 00:12:58,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:58,010 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262411276] [2020-12-23 00:12:58,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:58,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:58,246 INFO L134 CoverageAnalysis]: Checked inductivity of 619 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2020-12-23 00:12:58,246 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262411276] [2020-12-23 00:12:58,246 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020205360] [2020-12-23 00:12:58,247 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 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 00:12:58,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:58,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:58,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 34 conjunts are in the unsatisfiable core [2020-12-23 00:12:58,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:58,671 INFO L134 CoverageAnalysis]: Checked inductivity of 619 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-23 00:12:58,671 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:58,671 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 35] total 39 [2020-12-23 00:12:58,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121519855] [2020-12-23 00:12:58,672 INFO L461 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-12-23 00:12:58,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:58,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-12-23 00:12:58,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=740, Invalid=742, Unknown=0, NotChecked=0, Total=1482 [2020-12-23 00:12:58,674 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 39 states. [2020-12-23 00:12:58,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:58,909 INFO L93 Difference]: Finished difference Result 152 states and 160 transitions. [2020-12-23 00:12:58,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-12-23 00:12:58,910 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 54 [2020-12-23 00:12:58,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:58,911 INFO L225 Difference]: With dead ends: 152 [2020-12-23 00:12:58,911 INFO L226 Difference]: Without dead ends: 131 [2020-12-23 00:12:58,912 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=740, Invalid=742, Unknown=0, NotChecked=0, Total=1482 [2020-12-23 00:12:58,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2020-12-23 00:12:58,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 61. [2020-12-23 00:12:58,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-12-23 00:12:58,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2020-12-23 00:12:58,918 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 54 [2020-12-23 00:12:58,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:58,918 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2020-12-23 00:12:58,918 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-12-23 00:12:58,919 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2020-12-23 00:12:58,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-12-23 00:12:58,919 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:58,919 INFO L422 BasicCegarLoop]: trace histogram [36, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:59,133 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 00:12:59,134 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:59,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:59,134 INFO L82 PathProgramCache]: Analyzing trace with hash 1025850456, now seen corresponding path program 15 times [2020-12-23 00:12:59,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:59,135 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720881205] [2020-12-23 00:12:59,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:59,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:59,343 INFO L134 CoverageAnalysis]: Checked inductivity of 771 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2020-12-23 00:12:59,343 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720881205] [2020-12-23 00:12:59,343 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371214795] [2020-12-23 00:12:59,343 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 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 00:13:01,405 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2020-12-23 00:13:01,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:01,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 00:13:01,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:01,495 INFO L134 CoverageAnalysis]: Checked inductivity of 771 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2020-12-23 00:13:01,496 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:01,496 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 00:13:01,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792815542] [2020-12-23 00:13:01,498 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 00:13:01,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:01,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 00:13:01,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:13:01,503 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand 18 states. [2020-12-23 00:13:01,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:01,642 INFO L93 Difference]: Finished difference Result 143 states and 146 transitions. [2020-12-23 00:13:01,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 00:13:01,642 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 59 [2020-12-23 00:13:01,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:01,643 INFO L225 Difference]: With dead ends: 143 [2020-12-23 00:13:01,643 INFO L226 Difference]: Without dead ends: 137 [2020-12-23 00:13:01,644 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 59 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 00:13:01,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2020-12-23 00:13:01,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 62. [2020-12-23 00:13:01,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-12-23 00:13:01,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-12-23 00:13:01,649 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-12-23 00:13:01,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:01,650 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-12-23 00:13:01,650 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 00:13:01,650 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-12-23 00:13:01,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-23 00:13:01,650 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:01,650 INFO L422 BasicCegarLoop]: trace histogram [36, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:01,863 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 00:13:01,864 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:01,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:01,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1788039218, now seen corresponding path program 16 times [2020-12-23 00:13:01,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:01,865 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685536620] [2020-12-23 00:13:01,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:01,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:02,138 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2020-12-23 00:13:02,139 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685536620] [2020-12-23 00:13:02,139 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669477923] [2020-12-23 00:13:02,139 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 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 00:13:02,255 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:13:02,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:02,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 38 conjunts are in the unsatisfiable core [2020-12-23 00:13:02,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:02,648 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-23 00:13:02,648 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:02,649 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 39] total 44 [2020-12-23 00:13:02,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004915819] [2020-12-23 00:13:02,649 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-12-23 00:13:02,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:02,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-12-23 00:13:02,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=945, Invalid=947, Unknown=0, NotChecked=0, Total=1892 [2020-12-23 00:13:02,652 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 44 states. [2020-12-23 00:13:02,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:02,942 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2020-12-23 00:13:02,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-12-23 00:13:02,942 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 60 [2020-12-23 00:13:02,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:02,943 INFO L225 Difference]: With dead ends: 171 [2020-12-23 00:13:02,943 INFO L226 Difference]: Without dead ends: 148 [2020-12-23 00:13:02,945 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=945, Invalid=947, Unknown=0, NotChecked=0, Total=1892 [2020-12-23 00:13:02,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-12-23 00:13:02,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 68. [2020-12-23 00:13:02,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-23 00:13:02,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-23 00:13:02,950 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 60 [2020-12-23 00:13:02,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:02,950 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-23 00:13:02,950 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-12-23 00:13:02,951 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-23 00:13:02,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-23 00:13:02,951 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:02,951 INFO L422 BasicCegarLoop]: trace histogram [41, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:03,163 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 00:13:03,164 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:03,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:03,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1260283091, now seen corresponding path program 17 times [2020-12-23 00:13:03,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:03,165 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746143688] [2020-12-23 00:13:03,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:03,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:03,429 INFO L134 CoverageAnalysis]: Checked inductivity of 997 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2020-12-23 00:13:03,430 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746143688] [2020-12-23 00:13:03,430 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632921856] [2020-12-23 00:13:03,430 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 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