/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_06.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 00:12:13,171 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 00:12:13,175 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 00:12:13,234 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 00:12:13,235 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 00:12:13,240 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 00:12:13,244 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 00:12:13,249 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 00:12:13,253 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 00:12:13,259 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 00:12:13,263 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 00:12:13,265 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 00:12:13,265 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 00:12:13,269 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 00:12:13,271 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 00:12:13,273 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 00:12:13,273 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 00:12:13,274 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 00:12:13,288 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 00:12:13,295 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 00:12:13,297 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 00:12:13,301 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 00:12:13,302 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 00:12:13,305 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 00:12:13,328 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 00:12:13,339 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 00:12:13,341 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 00:12:13,346 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 00:12:13,347 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 00:12:13,407 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 00:12:13,408 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 00:12:13,411 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 00:12:13,411 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 00:12:13,412 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 00:12:13,412 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 00:12:13,412 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 00:12:13,412 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 00:12:13,413 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 00:12:13,413 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 00:12:13,414 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 00:12:13,415 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 00:12:13,415 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 00:12:13,415 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 00:12:13,415 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 00:12:13,415 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 00:12:13,416 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 00:12:13,416 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 00:12:13,416 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 00:12:13,416 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 00:12:13,417 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 00:12:13,417 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 00:12:13,417 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 00:12:13,417 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 00:12:13,417 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 00:12:13,418 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 00:12:13,876 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 00:12:13,913 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 00:12:13,917 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 00:12:13,918 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 00:12:13,919 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 00:12:13,924 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_06.i [2020-12-23 00:12:14,000 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/db7e6da7c/2fe3d5eff29d465db1dc149e7be63688/FLAGbe5572ea0 [2020-12-23 00:12:14,588 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 00:12:14,589 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_06.i [2020-12-23 00:12:14,597 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/db7e6da7c/2fe3d5eff29d465db1dc149e7be63688/FLAGbe5572ea0 [2020-12-23 00:12:14,962 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/db7e6da7c/2fe3d5eff29d465db1dc149e7be63688 [2020-12-23 00:12:14,970 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 00:12:14,972 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 00:12:14,977 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 00:12:14,977 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 00:12:14,982 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 00:12:14,983 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:12:14" (1/1) ... [2020-12-23 00:12:14,986 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2551738f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:14, skipping insertion in model container [2020-12-23 00:12:14,986 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:12:14" (1/1) ... [2020-12-23 00:12:15,001 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 00:12:15,028 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 00:12:15,198 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_06.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 00:12:15,221 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:12:15,231 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 00:12:15,244 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_06.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 00:12:15,254 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:12:15,275 INFO L208 MainTranslator]: Completed translation [2020-12-23 00:12:15,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15 WrapperNode [2020-12-23 00:12:15,276 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 00:12:15,277 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 00:12:15,278 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 00:12:15,278 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 00:12:15,288 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (1/1) ... [2020-12-23 00:12:15,298 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (1/1) ... [2020-12-23 00:12:15,323 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 00:12:15,324 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 00:12:15,324 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 00:12:15,325 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 00:12:15,335 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (1/1) ... [2020-12-23 00:12:15,336 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (1/1) ... [2020-12-23 00:12:15,338 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (1/1) ... [2020-12-23 00:12:15,338 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (1/1) ... [2020-12-23 00:12:15,344 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (1/1) ... [2020-12-23 00:12:15,349 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (1/1) ... [2020-12-23 00:12:15,351 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (1/1) ... [2020-12-23 00:12:15,353 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 00:12:15,354 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 00:12:15,354 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 00:12:15,355 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 00:12:15,356 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (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 00:12:15,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 00:12:15,479 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 00:12:15,479 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 00:12:15,479 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 00:12:15,479 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 00:12:15,479 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 00:12:15,479 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 00:12:15,810 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 00:12:15,811 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 00:12:15,813 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:12:15 BoogieIcfgContainer [2020-12-23 00:12:15,813 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 00:12:15,856 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 00:12:15,857 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 00:12:15,870 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 00:12:15,870 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 12:12:14" (1/3) ... [2020-12-23 00:12:15,873 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6781f5d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:12:15, skipping insertion in model container [2020-12-23 00:12:15,874 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:15" (2/3) ... [2020-12-23 00:12:15,874 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6781f5d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:12:15, skipping insertion in model container [2020-12-23 00:12:15,875 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:12:15" (3/3) ... [2020-12-23 00:12:15,880 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_06.i [2020-12-23 00:12:15,914 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 00:12:15,928 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 00:12:15,955 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 00:12:16,006 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 00:12:16,006 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 00:12:16,007 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 00:12:16,007 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 00:12:16,008 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 00:12:16,008 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 00:12:16,008 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 00:12:16,009 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 00:12:16,030 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-12-23 00:12:16,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 00:12:16,036 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:16,037 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:16,038 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:16,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:16,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2020-12-23 00:12:16,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:16,059 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871014638] [2020-12-23 00:12:16,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:16,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:16,345 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 00:12:16,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871014638] [2020-12-23 00:12:16,347 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:12:16,348 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 00:12:16,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811086080] [2020-12-23 00:12:16,354 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:12:16,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:16,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:12:16,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:12:16,381 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2020-12-23 00:12:16,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:16,469 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2020-12-23 00:12:16,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:12:16,472 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-23 00:12:16,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:16,482 INFO L225 Difference]: With dead ends: 28 [2020-12-23 00:12:16,483 INFO L226 Difference]: Without dead ends: 12 [2020-12-23 00:12:16,486 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 00:12:16,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-23 00:12:16,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-23 00:12:16,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-23 00:12:16,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2020-12-23 00:12:16,530 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2020-12-23 00:12:16,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:16,530 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2020-12-23 00:12:16,531 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:12:16,531 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2020-12-23 00:12:16,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 00:12:16,532 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:16,532 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:16,533 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 00:12:16,533 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:16,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:16,534 INFO L82 PathProgramCache]: Analyzing trace with hash 722375763, now seen corresponding path program 1 times [2020-12-23 00:12:16,535 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:16,535 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826752980] [2020-12-23 00:12:16,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:16,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:16,633 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 00:12:16,633 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826752980] [2020-12-23 00:12:16,634 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656545110] [2020-12-23 00:12:16,634 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 00:12:16,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:16,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-23 00:12:16,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:16,777 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 00:12:16,777 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-23 00:12:16,777 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2020-12-23 00:12:16,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074843814] [2020-12-23 00:12:16,780 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:12:16,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:16,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:12:16,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 00:12:16,782 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 3 states. [2020-12-23 00:12:16,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:16,829 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-12-23 00:12:16,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:12:16,831 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-12-23 00:12:16,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:16,832 INFO L225 Difference]: With dead ends: 24 [2020-12-23 00:12:16,832 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 00:12:16,833 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 00:12:16,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 00:12:16,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2020-12-23 00:12:16,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-23 00:12:16,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-12-23 00:12:16,838 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2020-12-23 00:12:16,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:16,838 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-12-23 00:12:16,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:12:16,839 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-12-23 00:12:16,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 00:12:16,840 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:16,840 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:17,055 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 00:12:17,056 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:17,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:17,057 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2020-12-23 00:12:17,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:17,058 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187439483] [2020-12-23 00:12:17,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:17,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:17,128 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 00:12:17,130 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187439483] [2020-12-23 00:12:17,131 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118877126] [2020-12-23 00:12:17,131 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 00:12:17,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:17,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 00:12:17,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:17,362 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 00:12:17,362 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:17,363 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 00:12:17,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003832642] [2020-12-23 00:12:17,364 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 00:12:17,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:17,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 00:12:17,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:12:17,366 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 5 states. [2020-12-23 00:12:17,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:17,433 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2020-12-23 00:12:17,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 00:12:17,434 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-23 00:12:17,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:17,435 INFO L225 Difference]: With dead ends: 28 [2020-12-23 00:12:17,435 INFO L226 Difference]: Without dead ends: 19 [2020-12-23 00:12:17,436 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 00:12:17,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-23 00:12:17,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2020-12-23 00:12:17,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-23 00:12:17,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-12-23 00:12:17,451 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2020-12-23 00:12:17,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:17,451 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-12-23 00:12:17,451 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 00:12:17,452 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-12-23 00:12:17,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 00:12:17,452 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:17,453 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:17,666 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:17,667 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:17,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:17,670 INFO L82 PathProgramCache]: Analyzing trace with hash -519784366, now seen corresponding path program 2 times [2020-12-23 00:12:17,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:17,670 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442631138] [2020-12-23 00:12:17,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:17,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:17,728 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 00:12:17,729 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442631138] [2020-12-23 00:12:17,729 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843416319] [2020-12-23 00:12:17,729 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 00:12:17,785 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:17,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:17,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:12:17,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:17,836 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 00:12:17,836 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:17,837 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2020-12-23 00:12:17,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803056420] [2020-12-23 00:12:17,838 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 00:12:17,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:17,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 00:12:17,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:12:17,840 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 7 states. [2020-12-23 00:12:17,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:17,918 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2020-12-23 00:12:17,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 00:12:17,919 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-12-23 00:12:17,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:17,922 INFO L225 Difference]: With dead ends: 36 [2020-12-23 00:12:17,923 INFO L226 Difference]: Without dead ends: 27 [2020-12-23 00:12:17,925 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 00:12:17,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-23 00:12:17,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 17. [2020-12-23 00:12:17,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 00:12:17,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-23 00:12:17,936 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-12-23 00:12:17,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:17,936 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-23 00:12:17,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 00:12:17,937 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-23 00:12:17,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 00:12:17,937 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:17,938 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:18,152 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:18,153 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:18,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:18,154 INFO L82 PathProgramCache]: Analyzing trace with hash -1963781416, now seen corresponding path program 3 times [2020-12-23 00:12:18,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:18,155 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629476507] [2020-12-23 00:12:18,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:18,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:18,312 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 00:12:18,312 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629476507] [2020-12-23 00:12:18,313 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735684824] [2020-12-23 00:12:18,313 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 00:12:18,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-23 00:12:18,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:18,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:12:18,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:18,418 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 00:12:18,419 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:18,419 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 00:12:18,419 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144814278] [2020-12-23 00:12:18,420 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 00:12:18,420 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:18,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 00:12:18,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:12:18,421 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-12-23 00:12:18,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:18,459 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2020-12-23 00:12:18,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 00:12:18,459 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-12-23 00:12:18,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:18,460 INFO L225 Difference]: With dead ends: 39 [2020-12-23 00:12:18,461 INFO L226 Difference]: Without dead ends: 33 [2020-12-23 00:12:18,461 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 00:12:18,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-23 00:12:18,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 18. [2020-12-23 00:12:18,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-23 00:12:18,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-23 00:12:18,466 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-12-23 00:12:18,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:18,467 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-23 00:12:18,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 00:12:18,467 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-23 00:12:18,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 00:12:18,468 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:18,468 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:18,682 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:18,683 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:18,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:18,684 INFO L82 PathProgramCache]: Analyzing trace with hash -696235598, now seen corresponding path program 4 times [2020-12-23 00:12:18,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:18,686 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409211137] [2020-12-23 00:12:18,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:18,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:18,752 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 00:12:18,753 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409211137] [2020-12-23 00:12:18,753 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667634723] [2020-12-23 00:12:18,753 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 00:12:18,812 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:12:18,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:18,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 00:12:18,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:18,889 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 00:12:18,890 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:18,890 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 11 [2020-12-23 00:12:18,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356276385] [2020-12-23 00:12:18,891 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 00:12:18,891 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:18,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 00:12:18,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:12:18,892 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 11 states. [2020-12-23 00:12:18,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:18,962 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-12-23 00:12:18,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 00:12:18,963 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2020-12-23 00:12:18,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:18,964 INFO L225 Difference]: With dead ends: 54 [2020-12-23 00:12:18,964 INFO L226 Difference]: Without dead ends: 43 [2020-12-23 00:12:18,965 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:12:18,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-23 00:12:18,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 23. [2020-12-23 00:12:18,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 00:12:18,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-12-23 00:12:18,971 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2020-12-23 00:12:18,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:18,971 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-12-23 00:12:18,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 00:12:18,971 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-12-23 00:12:18,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-23 00:12:18,972 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:18,972 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:19,185 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 00:12:19,186 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:19,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:19,187 INFO L82 PathProgramCache]: Analyzing trace with hash 1003861208, now seen corresponding path program 5 times [2020-12-23 00:12:19,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:19,188 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308733299] [2020-12-23 00:12:19,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:19,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:19,273 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 00:12:19,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308733299] [2020-12-23 00:12:19,274 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347353508] [2020-12-23 00:12:19,274 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 00:12:19,393 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-12-23 00:12:19,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:19,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 00:12:19,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:19,536 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:19,537 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:19,537 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 15 [2020-12-23 00:12:19,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195759235] [2020-12-23 00:12:19,537 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 00:12:19,538 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:19,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 00:12:19,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:12:19,539 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 15 states. [2020-12-23 00:12:19,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:19,642 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2020-12-23 00:12:19,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:12:19,643 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 21 [2020-12-23 00:12:19,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:19,644 INFO L225 Difference]: With dead ends: 65 [2020-12-23 00:12:19,644 INFO L226 Difference]: Without dead ends: 53 [2020-12-23 00:12:19,645 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:12:19,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-23 00:12:19,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 28. [2020-12-23 00:12:19,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-23 00:12:19,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-23 00:12:19,652 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2020-12-23 00:12:19,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:19,652 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-23 00:12:19,652 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 00:12:19,652 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-23 00:12:19,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-23 00:12:19,653 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:19,653 INFO L422 BasicCegarLoop]: trace histogram [12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:19,867 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:19,868 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:19,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:19,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1992579314, now seen corresponding path program 6 times [2020-12-23 00:12:19,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:19,870 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746137681] [2020-12-23 00:12:19,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:19,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:19,985 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:12:19,986 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746137681] [2020-12-23 00:12:19,986 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555440475] [2020-12-23 00:12:19,986 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 00:12:20,359 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 00:12:20,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:20,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 00:12:20,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:20,410 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:12:20,410 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:20,410 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 00:12:20,411 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956251992] [2020-12-23 00:12:20,411 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 00:12:20,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:20,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 00:12:20,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:12:20,413 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 9 states. [2020-12-23 00:12:20,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:20,475 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2020-12-23 00:12:20,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 00:12:20,476 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-12-23 00:12:20,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:20,477 INFO L225 Difference]: With dead ends: 65 [2020-12-23 00:12:20,477 INFO L226 Difference]: Without dead ends: 59 [2020-12-23 00:12:20,478 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 26 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 00:12:20,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-23 00:12:20,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 29. [2020-12-23 00:12:20,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-23 00:12:20,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-12-23 00:12:20,483 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 26 [2020-12-23 00:12:20,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:20,484 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-12-23 00:12:20,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 00:12:20,484 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-12-23 00:12:20,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-23 00:12:20,485 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:20,485 INFO L422 BasicCegarLoop]: trace histogram [12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:20,699 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:20,700 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:20,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:20,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1691862744, now seen corresponding path program 7 times [2020-12-23 00:12:20,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:20,702 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348545471] [2020-12-23 00:12:20,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:20,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:20,803 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:12:20,803 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348545471] [2020-12-23 00:12:20,804 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312214833] [2020-12-23 00:12:20,804 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 00:12:20,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:20,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 00:12:20,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:21,030 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-23 00:12:21,031 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:21,031 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 15] total 21 [2020-12-23 00:12:21,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991200357] [2020-12-23 00:12:21,032 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 00:12:21,032 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:21,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 00:12:21,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:12:21,033 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 21 states. [2020-12-23 00:12:21,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:21,180 INFO L93 Difference]: Finished difference Result 85 states and 95 transitions. [2020-12-23 00:12:21,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-23 00:12:21,180 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 27 [2020-12-23 00:12:21,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:21,182 INFO L225 Difference]: With dead ends: 85 [2020-12-23 00:12:21,182 INFO L226 Difference]: Without dead ends: 71 [2020-12-23 00:12:21,183 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:12:21,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-12-23 00:12:21,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 36. [2020-12-23 00:12:21,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-23 00:12:21,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-23 00:12:21,189 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2020-12-23 00:12:21,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:21,190 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-23 00:12:21,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 00:12:21,190 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-23 00:12:21,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-23 00:12:21,191 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:21,191 INFO L422 BasicCegarLoop]: trace histogram [18, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:21,405 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-23 00:12:21,406 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:21,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:21,407 INFO L82 PathProgramCache]: Analyzing trace with hash 1563220882, now seen corresponding path program 8 times [2020-12-23 00:12:21,408 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:21,408 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482503475] [2020-12-23 00:12:21,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:21,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:21,529 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-23 00:12:21,530 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482503475] [2020-12-23 00:12:21,530 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730864758] [2020-12-23 00:12:21,530 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 00:12:21,613 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:21,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:21,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-23 00:12:21,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:21,842 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-23 00:12:21,843 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:21,843 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 21] total 27 [2020-12-23 00:12:21,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392777900] [2020-12-23 00:12:21,844 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-23 00:12:21,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:21,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-23 00:12:21,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=352, Unknown=0, NotChecked=0, Total=702 [2020-12-23 00:12:21,846 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 27 states. [2020-12-23 00:12:22,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:22,012 INFO L93 Difference]: Finished difference Result 98 states and 108 transitions. [2020-12-23 00:12:22,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-23 00:12:22,012 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-12-23 00:12:22,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:22,013 INFO L225 Difference]: With dead ends: 98 [2020-12-23 00:12:22,014 INFO L226 Difference]: Without dead ends: 83 [2020-12-23 00:12:22,015 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=350, Invalid=352, Unknown=0, NotChecked=0, Total=702 [2020-12-23 00:12:22,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-12-23 00:12:22,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 43. [2020-12-23 00:12:22,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-23 00:12:22,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2020-12-23 00:12:22,022 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 34 [2020-12-23 00:12:22,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:22,023 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2020-12-23 00:12:22,023 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-23 00:12:22,023 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2020-12-23 00:12:22,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-23 00:12:22,024 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:22,024 INFO L422 BasicCegarLoop]: trace histogram [24, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:22,239 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:22,240 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:22,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:22,241 INFO L82 PathProgramCache]: Analyzing trace with hash -959154600, now seen corresponding path program 9 times [2020-12-23 00:12:22,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:22,242 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025700676] [2020-12-23 00:12:22,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:22,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:22,409 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-23 00:12:22,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025700676] [2020-12-23 00:12:22,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825379865] [2020-12-23 00:12:22,410 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 00:12:22,607 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-23 00:12:22,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:22,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 00:12:22,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:22,684 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-23 00:12:22,685 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:22,685 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 00:12:22,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806643000] [2020-12-23 00:12:22,686 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 00:12:22,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:22,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 00:12:22,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:12:22,688 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 12 states. [2020-12-23 00:12:22,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:22,785 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2020-12-23 00:12:22,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 00:12:22,785 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-12-23 00:12:22,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:22,787 INFO L225 Difference]: With dead ends: 95 [2020-12-23 00:12:22,787 INFO L226 Difference]: Without dead ends: 89 [2020-12-23 00:12:22,788 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:12:22,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-12-23 00:12:22,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 44. [2020-12-23 00:12:22,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-23 00:12:22,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-12-23 00:12:22,811 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-12-23 00:12:22,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:22,812 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-12-23 00:12:22,812 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 00:12:22,812 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-12-23 00:12:22,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-12-23 00:12:22,813 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:22,813 INFO L422 BasicCegarLoop]: trace histogram [24, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:23,018 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:23,018 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:23,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:23,020 INFO L82 PathProgramCache]: Analyzing trace with hash 382424626, now seen corresponding path program 10 times [2020-12-23 00:12:23,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:23,021 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195466903] [2020-12-23 00:12:23,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:23,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:23,158 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-23 00:12:23,158 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195466903] [2020-12-23 00:12:23,158 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1132915078] [2020-12-23 00:12:23,159 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 00:12:23,244 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:12:23,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:23,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-23 00:12:23,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:23,551 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-23 00:12:23,552 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:23,552 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 27] total 34 [2020-12-23 00:12:23,552 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033054038] [2020-12-23 00:12:23,553 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-12-23 00:12:23,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:23,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-12-23 00:12:23,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=562, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 00:12:23,555 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 34 states. [2020-12-23 00:12:23,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:23,752 INFO L93 Difference]: Finished difference Result 119 states and 130 transitions. [2020-12-23 00:12:23,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-23 00:12:23,752 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 42 [2020-12-23 00:12:23,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:23,753 INFO L225 Difference]: With dead ends: 119 [2020-12-23 00:12:23,754 INFO L226 Difference]: Without dead ends: 102 [2020-12-23 00:12:23,755 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 653 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=560, Invalid=562, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 00:12:23,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-12-23 00:12:23,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 52. [2020-12-23 00:12:23,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-23 00:12:23,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-12-23 00:12:23,774 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 42 [2020-12-23 00:12:23,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:23,776 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-12-23 00:12:23,777 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-12-23 00:12:23,777 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-12-23 00:12:23,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-23 00:12:23,778 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:23,778 INFO L422 BasicCegarLoop]: trace histogram [31, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:23,992 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 00:12:23,993 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:23,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:23,994 INFO L82 PathProgramCache]: Analyzing trace with hash -420901837, now seen corresponding path program 11 times [2020-12-23 00:12:23,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:23,995 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902991501] [2020-12-23 00:12:23,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:24,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:24,150 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2020-12-23 00:12:24,150 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902991501] [2020-12-23 00:12:24,151 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405013022] [2020-12-23 00:12:24,151 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 00:13:48,038 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2020-12-23 00:13:48,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:48,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 33 conjunts are in the unsatisfiable core [2020-12-23 00:13:48,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:48,579 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-23 00:13:48,579 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:48,579 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 34] total 40 [2020-12-23 00:13:48,580 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720679162] [2020-12-23 00:13:48,580 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-23 00:13:48,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:48,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-23 00:13:48,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=779, Invalid=781, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 00:13:48,583 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 40 states. [2020-12-23 00:13:48,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:48,812 INFO L93 Difference]: Finished difference Result 132 states and 142 transitions. [2020-12-23 00:13:48,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-23 00:13:48,812 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 50 [2020-12-23 00:13:48,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:48,814 INFO L225 Difference]: With dead ends: 132 [2020-12-23 00:13:48,814 INFO L226 Difference]: Without dead ends: 114 [2020-12-23 00:13:48,815 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 967 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=779, Invalid=781, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 00:13:48,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-12-23 00:13:48,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 59. [2020-12-23 00:13:48,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-12-23 00:13:48,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-12-23 00:13:48,823 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 50 [2020-12-23 00:13:48,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:48,823 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-12-23 00:13:48,823 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-23 00:13:48,823 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-12-23 00:13:48,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-23 00:13:48,824 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:48,825 INFO L422 BasicCegarLoop]: trace histogram [37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:49,038 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 00:13:49,039 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:49,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:49,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1334994473, now seen corresponding path program 12 times [2020-12-23 00:13:49,040 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:49,041 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791075861] [2020-12-23 00:13:49,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:49,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:49,214 INFO L134 CoverageAnalysis]: Checked inductivity of 769 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-12-23 00:13:49,214 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791075861] [2020-12-23 00:13:49,214 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385516788] [2020-12-23 00:13:49,215 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 00:14:10,284 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-23 00:14:10,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:14:10,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 00:14:10,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:14:10,420 INFO L134 CoverageAnalysis]: Checked inductivity of 769 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-12-23 00:14:10,421 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:14:10,421 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-23 00:14:10,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050250423] [2020-12-23 00:14:10,422 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 00:14:10,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:14:10,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 00:14:10,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:14:10,424 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 15 states. [2020-12-23 00:14:10,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:14:10,549 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2020-12-23 00:14:10,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:14:10,550 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 57 [2020-12-23 00:14:10,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:14:10,551 INFO L225 Difference]: With dead ends: 126 [2020-12-23 00:14:10,551 INFO L226 Difference]: Without dead ends: 120 [2020-12-23 00:14:10,552 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 57 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 00:14:10,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-12-23 00:14:10,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 60. [2020-12-23 00:14:10,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-23 00:14:10,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-12-23 00:14:10,559 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-12-23 00:14:10,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:14:10,560 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-12-23 00:14:10,560 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 00:14:10,560 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-12-23 00:14:10,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-12-23 00:14:10,561 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:14:10,561 INFO L422 BasicCegarLoop]: trace histogram [37, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:14:10,762 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 00:14:10,762 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:14:10,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:14:10,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1616290451, now seen corresponding path program 13 times [2020-12-23 00:14:10,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:14:10,763 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250191722] [2020-12-23 00:14:10,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:14:10,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:14:11,004 INFO L134 CoverageAnalysis]: Checked inductivity of 781 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-12-23 00:14:11,005 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250191722] [2020-12-23 00:14:11,005 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757522414] [2020-12-23 00:14:11,005 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 00:14:11,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:14:11,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 39 conjunts are in the unsatisfiable core [2020-12-23 00:14:11,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:14:11,561 INFO L134 CoverageAnalysis]: Checked inductivity of 781 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:14:11,562 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:14:11,562 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 40] total 47 [2020-12-23 00:14:11,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563962515] [2020-12-23 00:14:11,563 INFO L461 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-12-23 00:14:11,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:14:11,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-12-23 00:14:11,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1080, Invalid=1082, Unknown=0, NotChecked=0, Total=2162 [2020-12-23 00:14:11,565 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 47 states. [2020-12-23 00:14:11,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:14:11,826 INFO L93 Difference]: Finished difference Result 153 states and 164 transitions. [2020-12-23 00:14:11,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-12-23 00:14:11,827 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 58 [2020-12-23 00:14:11,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:14:11,828 INFO L225 Difference]: With dead ends: 153 [2020-12-23 00:14:11,828 INFO L226 Difference]: Without dead ends: 133 [2020-12-23 00:14:11,830 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=1080, Invalid=1082, Unknown=0, NotChecked=0, Total=2162 [2020-12-23 00:14:11,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-12-23 00:14:11,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 68. [2020-12-23 00:14:11,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-23 00:14:11,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-23 00:14:11,836 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 58 [2020-12-23 00:14:11,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:14:11,837 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-23 00:14:11,837 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-12-23 00:14:11,837 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-23 00:14:11,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-23 00:14:11,838 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:14:11,838 INFO L422 BasicCegarLoop]: trace histogram [44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:14:12,050 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:14:12,051 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:14:12,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:14:12,052 INFO L82 PathProgramCache]: Analyzing trace with hash 1412249074, now seen corresponding path program 14 times [2020-12-23 00:14:12,052 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:14:12,053 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107527510] [2020-12-23 00:14:12,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:14:12,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:14:12,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2020-12-23 00:14:12,269 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107527510] [2020-12-23 00:14:12,270 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474630576] [2020-12-23 00:14:12,270 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 00:14:12,385 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:14:12,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:14:12,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 46 conjunts are in the unsatisfiable core [2020-12-23 00:14:12,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:14:12,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-23 00:14:12,953 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:14:12,953 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 47] total 54 [2020-12-23 00:14:12,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198910347] [2020-12-23 00:14:12,955 INFO L461 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-12-23 00:14:12,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:14:12,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-12-23 00:14:12,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1430, Invalid=1432, Unknown=0, NotChecked=0, Total=2862 [2020-12-23 00:14:12,960 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 54 states. [2020-12-23 00:14:13,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:14:13,268 INFO L93 Difference]: Finished difference Result 167 states and 178 transitions. [2020-12-23 00:14:13,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-12-23 00:14:13,269 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 66 [2020-12-23 00:14:13,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:14:13,270 INFO L225 Difference]: With dead ends: 167 [2020-12-23 00:14:13,270 INFO L226 Difference]: Without dead ends: 146 [2020-12-23 00:14:13,272 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1933 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1430, Invalid=1432, Unknown=0, NotChecked=0, Total=2862 [2020-12-23 00:14:13,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-12-23 00:14:13,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 76. [2020-12-23 00:14:13,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-23 00:14:13,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-12-23 00:14:13,282 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 66 [2020-12-23 00:14:13,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:14:13,282 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-12-23 00:14:13,283 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-12-23 00:14:13,283 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-12-23 00:14:13,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-12-23 00:14:13,284 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:14:13,284 INFO L422 BasicCegarLoop]: trace histogram [51, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:14:13,497 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 00:14:13,498 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:14:13,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:14:13,499 INFO L82 PathProgramCache]: Analyzing trace with hash 1809073011, now seen corresponding path program 15 times [2020-12-23 00:14:13,499 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:14:13,499 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017176451] [2020-12-23 00:14:13,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:14:13,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:14:13,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2020-12-23 00:14:13,766 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017176451] [2020-12-23 00:14:13,766 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314194300] [2020-12-23 00:14:13,767 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 00:14:15,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2020-12-23 00:14:15,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:14:15,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 00:14:15,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:14:15,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2020-12-23 00:14:15,391 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:14:15,391 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 00:14:15,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765742285] [2020-12-23 00:14:15,392 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 00:14:15,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:14:15,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 00:14:15,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:14:15,393 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 18 states. [2020-12-23 00:14:15,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:14:15,518 INFO L93 Difference]: Finished difference Result 158 states and 161 transitions. [2020-12-23 00:14:15,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 00:14:15,519 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 74 [2020-12-23 00:14:15,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:14:15,521 INFO L225 Difference]: With dead ends: 158 [2020-12-23 00:14:15,521 INFO L226 Difference]: Without dead ends: 152 [2020-12-23 00:14:15,522 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 74 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 00:14:15,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-12-23 00:14:15,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 77. [2020-12-23 00:14:15,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-12-23 00:14:15,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2020-12-23 00:14:15,537 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 74 [2020-12-23 00:14:15,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:14:15,537 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2020-12-23 00:14:15,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 00:14:15,537 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2020-12-23 00:14:15,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-12-23 00:14:15,544 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:14:15,544 INFO L422 BasicCegarLoop]: trace histogram [51, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:14:15,745 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 00:14:15,745 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:14:15,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:14:15,746 INFO L82 PathProgramCache]: Analyzing trace with hash 298134647, now seen corresponding path program 16 times [2020-12-23 00:14:15,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:14:15,747 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2022377337] [2020-12-23 00:14:15,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:14:15,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:14:16,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2020-12-23 00:14:16,011 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2022377337] [2020-12-23 00:14:16,012 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439932739] [2020-12-23 00:14:16,012 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 00:14:16,128 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:14:16,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:14:16,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 53 conjunts are in the unsatisfiable core [2020-12-23 00:14:16,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:14:16,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-23 00:14:16,713 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:14:16,713 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 54] total 62 [2020-12-23 00:14:16,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069658763] [2020-12-23 00:14:16,714 INFO L461 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-12-23 00:14:16,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:14:16,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-12-23 00:14:16,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1890, Invalid=1892, Unknown=0, NotChecked=0, Total=3782 [2020-12-23 00:14:16,717 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 62 states. [2020-12-23 00:14:17,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:14:17,064 INFO L93 Difference]: Finished difference Result 189 states and 201 transitions. [2020-12-23 00:14:17,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-12-23 00:14:17,065 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 75 [2020-12-23 00:14:17,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:14:17,066 INFO L225 Difference]: With dead ends: 189 [2020-12-23 00:14:17,066 INFO L226 Difference]: Without dead ends: 166 [2020-12-23 00:14:17,068 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2629 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1890, Invalid=1892, Unknown=0, NotChecked=0, Total=3782 [2020-12-23 00:14:17,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-12-23 00:14:17,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 86. [2020-12-23 00:14:17,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-12-23 00:14:17,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-12-23 00:14:17,074 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 75 [2020-12-23 00:14:17,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:14:17,075 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-12-23 00:14:17,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-12-23 00:14:17,075 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-12-23 00:14:17,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-12-23 00:14:17,076 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:14:17,076 INFO L422 BasicCegarLoop]: trace histogram [59, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:14:17,289 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 00:14:17,290 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:14:17,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:14:17,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1931527795, now seen corresponding path program 17 times [2020-12-23 00:14:17,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:14:17,291 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252047468] [2020-12-23 00:14:17,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:14:17,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:14:17,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1906 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2020-12-23 00:14:17,620 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252047468] [2020-12-23 00:14:17,620 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090727191] [2020-12-23 00:14:17,620 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