/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-cav19/array_init_pair_sum_const.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 01:07:22,200 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 01:07:22,203 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 01:07:22,262 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 01:07:22,262 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 01:07:22,267 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 01:07:22,271 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 01:07:22,277 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 01:07:22,282 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 01:07:22,290 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 01:07:22,295 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 01:07:22,297 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 01:07:22,297 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 01:07:22,301 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 01:07:22,303 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 01:07:22,330 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 01:07:22,332 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 01:07:22,337 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 01:07:22,342 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 01:07:22,346 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 01:07:22,350 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 01:07:22,352 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 01:07:22,354 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 01:07:22,356 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 01:07:22,363 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 01:07:22,391 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 01:07:22,392 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 01:07:22,393 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 01:07:22,395 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 01:07:22,447 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 01:07:22,447 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 01:07:22,453 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 01:07:22,454 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 01:07:22,454 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 01:07:22,455 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 01:07:22,455 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 01:07:22,455 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 01:07:22,456 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 01:07:22,456 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 01:07:22,458 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 01:07:22,458 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 01:07:22,459 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 01:07:22,459 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 01:07:22,459 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 01:07:22,460 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 01:07:22,460 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 01:07:22,460 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 01:07:22,460 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 01:07:22,461 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 01:07:22,461 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 01:07:22,461 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 01:07:22,461 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 01:07:22,462 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 01:07:22,462 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 01:07:22,462 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 01:07:22,901 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 01:07:22,940 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 01:07:22,944 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 01:07:22,946 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 01:07:22,946 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 01:07:22,947 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-cav19/array_init_pair_sum_const.c [2020-12-23 01:07:23,043 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/0ee70c0e9/919dfd8f76b447a0b6b752a65bcf9351/FLAG60d074270 [2020-12-23 01:07:23,652 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 01:07:23,653 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-cav19/array_init_pair_sum_const.c [2020-12-23 01:07:23,661 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/0ee70c0e9/919dfd8f76b447a0b6b752a65bcf9351/FLAG60d074270 [2020-12-23 01:07:24,046 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/0ee70c0e9/919dfd8f76b447a0b6b752a65bcf9351 [2020-12-23 01:07:24,049 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 01:07:24,052 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 01:07:24,057 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 01:07:24,057 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 01:07:24,062 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 01:07:24,064 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,067 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e9769e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24, skipping insertion in model container [2020-12-23 01:07:24,067 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,078 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 01:07:24,096 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 01:07:24,310 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-cav19/array_init_pair_sum_const.c[416,429] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~b~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~c~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] [2020-12-23 01:07:24,329 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 01:07:24,338 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 01:07:24,353 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-cav19/array_init_pair_sum_const.c[416,429] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: 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: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#c~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#c~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] [2020-12-23 01:07:24,361 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 01:07:24,377 INFO L208 MainTranslator]: Completed translation [2020-12-23 01:07:24,378 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24 WrapperNode [2020-12-23 01:07:24,378 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 01:07:24,379 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 01:07:24,380 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 01:07:24,380 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 01:07:24,389 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,398 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,421 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 01:07:24,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 01:07:24,422 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 01:07:24,423 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 01:07:24,432 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,435 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,435 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,441 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,446 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,448 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (1/1) ... [2020-12-23 01:07:24,451 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 01:07:24,452 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 01:07:24,452 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 01:07:24,453 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 01:07:24,454 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (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 01:07:24,572 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 01:07:24,573 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 01:07:24,573 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 01:07:24,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 01:07:24,573 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 01:07:24,573 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 01:07:24,574 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 01:07:25,095 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 01:07:25,095 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 01:07:25,097 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 01:07:25 BoogieIcfgContainer [2020-12-23 01:07:25,098 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 01:07:25,100 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 01:07:25,100 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 01:07:25,105 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 01:07:25,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 01:07:24" (1/3) ... [2020-12-23 01:07:25,106 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4935ce44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 01:07:25, skipping insertion in model container [2020-12-23 01:07:25,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 01:07:24" (2/3) ... [2020-12-23 01:07:25,107 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4935ce44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 01:07:25, skipping insertion in model container [2020-12-23 01:07:25,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 01:07:25" (3/3) ... [2020-12-23 01:07:25,109 INFO L111 eAbstractionObserver]: Analyzing ICFG array_init_pair_sum_const.c [2020-12-23 01:07:25,117 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 01:07:25,123 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 01:07:25,143 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 01:07:25,183 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 01:07:25,183 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 01:07:25,183 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 01:07:25,183 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 01:07:25,184 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 01:07:25,184 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 01:07:25,185 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 01:07:25,185 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 01:07:25,203 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-12-23 01:07:25,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 01:07:25,210 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:25,211 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:25,211 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:25,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:25,220 INFO L82 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2020-12-23 01:07:25,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:25,234 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409693172] [2020-12-23 01:07:25,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:25,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:25,458 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 01:07:25,459 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409693172] [2020-12-23 01:07:25,460 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 01:07:25,460 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 01:07:25,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650656590] [2020-12-23 01:07:25,466 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 01:07:25,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:25,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 01:07:25,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 01:07:25,486 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2020-12-23 01:07:25,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:25,558 INFO L93 Difference]: Finished difference Result 34 states and 46 transitions. [2020-12-23 01:07:25,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 01:07:25,560 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-23 01:07:25,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:25,570 INFO L225 Difference]: With dead ends: 34 [2020-12-23 01:07:25,570 INFO L226 Difference]: Without dead ends: 16 [2020-12-23 01:07:25,573 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 01:07:25,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-23 01:07:25,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-12-23 01:07:25,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-23 01:07:25,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-23 01:07:25,611 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-12-23 01:07:25,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:25,611 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-23 01:07:25,611 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 01:07:25,612 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-23 01:07:25,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 01:07:25,612 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:25,612 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:25,613 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 01:07:25,613 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:25,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:25,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1564645395, now seen corresponding path program 1 times [2020-12-23 01:07:25,615 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:25,615 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788692946] [2020-12-23 01:07:25,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:25,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:25,739 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 01:07:25,740 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788692946] [2020-12-23 01:07:25,740 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 01:07:25,740 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 01:07:25,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120075467] [2020-12-23 01:07:25,742 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 01:07:25,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:25,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 01:07:25,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 01:07:25,744 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-12-23 01:07:25,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:25,797 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2020-12-23 01:07:25,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 01:07:25,798 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-12-23 01:07:25,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:25,802 INFO L225 Difference]: With dead ends: 25 [2020-12-23 01:07:25,802 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 01:07:25,803 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 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 01:07:25,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 01:07:25,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2020-12-23 01:07:25,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-23 01:07:25,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-23 01:07:25,808 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2020-12-23 01:07:25,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:25,809 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-23 01:07:25,809 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 01:07:25,809 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-23 01:07:25,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-23 01:07:25,810 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:25,810 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:25,810 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-23 01:07:25,811 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:25,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:25,811 INFO L82 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2020-12-23 01:07:25,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:25,812 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262171501] [2020-12-23 01:07:25,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:25,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:25,907 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 01:07:25,907 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262171501] [2020-12-23 01:07:25,908 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657643117] [2020-12-23 01:07:25,910 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 01:07:25,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:25,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 01:07:26,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:26,139 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 01:07:26,140 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:26,140 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-12-23 01:07:26,140 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707112228] [2020-12-23 01:07:26,141 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 01:07:26,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:26,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 01:07:26,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 01:07:26,143 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-12-23 01:07:26,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:26,191 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-12-23 01:07:26,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 01:07:26,192 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-12-23 01:07:26,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:26,193 INFO L225 Difference]: With dead ends: 30 [2020-12-23 01:07:26,193 INFO L226 Difference]: Without dead ends: 19 [2020-12-23 01:07:26,194 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 01:07:26,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-23 01:07:26,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-12-23 01:07:26,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-23 01:07:26,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-23 01:07:26,199 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-12-23 01:07:26,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:26,199 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-23 01:07:26,200 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 01:07:26,200 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-23 01:07:26,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 01:07:26,200 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:26,201 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:26,415 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-23 01:07:26,416 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:26,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:26,418 INFO L82 PathProgramCache]: Analyzing trace with hash -628241457, now seen corresponding path program 2 times [2020-12-23 01:07:26,418 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:26,419 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926629377] [2020-12-23 01:07:26,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:26,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:26,556 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 01:07:26,557 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926629377] [2020-12-23 01:07:26,558 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443066161] [2020-12-23 01:07:26,559 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:26,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 01:07:26,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:07:26,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 01:07:26,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:26,762 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 01:07:26,763 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:26,763 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-12-23 01:07:26,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122581477] [2020-12-23 01:07:26,764 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 01:07:26,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:26,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 01:07:26,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2020-12-23 01:07:26,766 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 8 states. [2020-12-23 01:07:26,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:26,850 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-12-23 01:07:26,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 01:07:26,850 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-12-23 01:07:26,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:26,872 INFO L225 Difference]: With dead ends: 32 [2020-12-23 01:07:26,872 INFO L226 Difference]: Without dead ends: 21 [2020-12-23 01:07:26,874 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2020-12-23 01:07:26,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-23 01:07:26,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2020-12-23 01:07:26,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-23 01:07:26,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-23 01:07:26,890 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2020-12-23 01:07:26,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:26,890 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-23 01:07:26,890 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 01:07:26,891 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-23 01:07:26,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-23 01:07:26,892 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:26,892 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:27,094 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:27,095 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:27,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:27,096 INFO L82 PathProgramCache]: Analyzing trace with hash -705850739, now seen corresponding path program 3 times [2020-12-23 01:07:27,096 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:27,097 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204997244] [2020-12-23 01:07:27,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:27,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:27,267 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 01:07:27,268 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204997244] [2020-12-23 01:07:27,268 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632620219] [2020-12-23 01:07:27,269 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:27,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-23 01:07:27,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:07:27,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 01:07:27,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:27,458 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 01:07:27,458 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:27,458 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2020-12-23 01:07:27,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199271291] [2020-12-23 01:07:27,459 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 01:07:27,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:27,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 01:07:27,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=39, Unknown=0, NotChecked=0, Total=72 [2020-12-23 01:07:27,464 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-12-23 01:07:27,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:27,688 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2020-12-23 01:07:27,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 01:07:27,689 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2020-12-23 01:07:27,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:27,690 INFO L225 Difference]: With dead ends: 59 [2020-12-23 01:07:27,691 INFO L226 Difference]: Without dead ends: 48 [2020-12-23 01:07:27,692 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=61, Unknown=0, NotChecked=0, Total=110 [2020-12-23 01:07:27,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-23 01:07:27,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 28. [2020-12-23 01:07:27,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-23 01:07:27,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-23 01:07:27,699 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 17 [2020-12-23 01:07:27,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:27,699 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-23 01:07:27,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 01:07:27,700 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-23 01:07:27,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-23 01:07:27,700 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:27,701 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:27,906 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:27,906 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:27,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:27,907 INFO L82 PathProgramCache]: Analyzing trace with hash -318070331, now seen corresponding path program 4 times [2020-12-23 01:07:27,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:27,907 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477584935] [2020-12-23 01:07:27,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:27,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:28,009 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 01:07:28,010 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477584935] [2020-12-23 01:07:28,010 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776040089] [2020-12-23 01:07:28,011 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:28,227 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 01:07:28,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:07:28,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 01:07:28,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:28,401 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 01:07:28,402 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:28,402 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-12-23 01:07:28,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276665444] [2020-12-23 01:07:28,403 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 01:07:28,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:28,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 01:07:28,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=72, Unknown=0, NotChecked=0, Total=132 [2020-12-23 01:07:28,404 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 12 states. [2020-12-23 01:07:28,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:28,495 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2020-12-23 01:07:28,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 01:07:28,496 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-12-23 01:07:28,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:28,497 INFO L225 Difference]: With dead ends: 48 [2020-12-23 01:07:28,497 INFO L226 Difference]: Without dead ends: 31 [2020-12-23 01:07:28,498 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=72, Unknown=0, NotChecked=0, Total=132 [2020-12-23 01:07:28,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-23 01:07:28,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-12-23 01:07:28,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-23 01:07:28,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-12-23 01:07:28,505 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-12-23 01:07:28,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:28,505 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-12-23 01:07:28,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 01:07:28,505 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-12-23 01:07:28,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-23 01:07:28,506 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:28,506 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:28,719 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:28,720 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:28,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:28,721 INFO L82 PathProgramCache]: Analyzing trace with hash -509111549, now seen corresponding path program 5 times [2020-12-23 01:07:28,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:28,723 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552160855] [2020-12-23 01:07:28,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:28,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:28,874 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 01:07:28,874 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552160855] [2020-12-23 01:07:28,874 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931838181] [2020-12-23 01:07:28,875 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:29,437 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-23 01:07:29,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:07:29,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 01:07:29,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:29,609 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-23 01:07:29,609 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:29,609 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-12-23 01:07:29,610 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184135167] [2020-12-23 01:07:29,611 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 01:07:29,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:29,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 01:07:29,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-12-23 01:07:29,612 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 14 states. [2020-12-23 01:07:29,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:29,755 INFO L93 Difference]: Finished difference Result 85 states and 91 transitions. [2020-12-23 01:07:29,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 01:07:29,756 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2020-12-23 01:07:29,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:29,757 INFO L225 Difference]: With dead ends: 85 [2020-12-23 01:07:29,757 INFO L226 Difference]: Without dead ends: 68 [2020-12-23 01:07:29,758 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=120, Unknown=0, NotChecked=0, Total=210 [2020-12-23 01:07:29,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-23 01:07:29,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 36. [2020-12-23 01:07:29,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-23 01:07:29,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-23 01:07:29,766 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2020-12-23 01:07:29,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:29,766 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-23 01:07:29,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 01:07:29,766 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-23 01:07:29,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-23 01:07:29,767 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:29,768 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:29,983 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-23 01:07:29,984 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:29,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:29,985 INFO L82 PathProgramCache]: Analyzing trace with hash -189699779, now seen corresponding path program 6 times [2020-12-23 01:07:29,986 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:29,986 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096385746] [2020-12-23 01:07:29,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:30,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:30,119 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 01:07:30,120 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096385746] [2020-12-23 01:07:30,120 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489773001] [2020-12-23 01:07:30,120 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:30,337 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 01:07:30,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:07:30,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 01:07:30,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:30,498 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 01:07:30,499 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:30,499 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2020-12-23 01:07:30,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127569786] [2020-12-23 01:07:30,501 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 01:07:30,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:30,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 01:07:30,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=157, Unknown=0, NotChecked=0, Total=272 [2020-12-23 01:07:30,503 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 17 states. [2020-12-23 01:07:30,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:30,667 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2020-12-23 01:07:30,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 01:07:30,667 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 33 [2020-12-23 01:07:30,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:30,669 INFO L225 Difference]: With dead ends: 99 [2020-12-23 01:07:30,669 INFO L226 Difference]: Without dead ends: 78 [2020-12-23 01:07:30,670 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=157, Unknown=0, NotChecked=0, Total=272 [2020-12-23 01:07:30,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-12-23 01:07:30,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 40. [2020-12-23 01:07:30,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-23 01:07:30,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-12-23 01:07:30,678 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2020-12-23 01:07:30,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:30,678 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-12-23 01:07:30,679 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 01:07:30,679 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-12-23 01:07:30,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-23 01:07:30,680 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:30,680 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:30,893 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:30,894 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:30,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:30,895 INFO L82 PathProgramCache]: Analyzing trace with hash 760584185, now seen corresponding path program 7 times [2020-12-23 01:07:30,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:30,896 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962601792] [2020-12-23 01:07:30,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:30,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:31,014 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 01:07:31,015 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962601792] [2020-12-23 01:07:31,015 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159452124] [2020-12-23 01:07:31,015 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:31,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:31,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 01:07:31,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:31,253 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 01:07:31,253 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:31,253 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2020-12-23 01:07:31,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61052611] [2020-12-23 01:07:31,254 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 01:07:31,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:31,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 01:07:31,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=174, Unknown=0, NotChecked=0, Total=306 [2020-12-23 01:07:31,256 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 18 states. [2020-12-23 01:07:31,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:31,357 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2020-12-23 01:07:31,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 01:07:31,358 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2020-12-23 01:07:31,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:31,359 INFO L225 Difference]: With dead ends: 66 [2020-12-23 01:07:31,359 INFO L226 Difference]: Without dead ends: 43 [2020-12-23 01:07:31,360 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=132, Invalid=174, Unknown=0, NotChecked=0, Total=306 [2020-12-23 01:07:31,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-23 01:07:31,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-12-23 01:07:31,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-23 01:07:31,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-12-23 01:07:31,366 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2020-12-23 01:07:31,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:31,367 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-12-23 01:07:31,367 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 01:07:31,367 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-12-23 01:07:31,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-23 01:07:31,368 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:31,368 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:31,582 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:31,583 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:31,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:31,584 INFO L82 PathProgramCache]: Analyzing trace with hash 885824567, now seen corresponding path program 8 times [2020-12-23 01:07:31,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:31,585 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758662298] [2020-12-23 01:07:31,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:31,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:31,749 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 01:07:31,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758662298] [2020-12-23 01:07:31,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812547738] [2020-12-23 01:07:31,750 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:31,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 01:07:31,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:07:31,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-23 01:07:31,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:32,058 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 01:07:32,059 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:32,059 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-12-23 01:07:32,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949171209] [2020-12-23 01:07:32,060 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 01:07:32,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:32,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 01:07:32,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=218, Unknown=0, NotChecked=0, Total=380 [2020-12-23 01:07:32,061 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 20 states. [2020-12-23 01:07:32,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:32,164 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2020-12-23 01:07:32,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 01:07:32,165 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 39 [2020-12-23 01:07:32,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:32,166 INFO L225 Difference]: With dead ends: 68 [2020-12-23 01:07:32,166 INFO L226 Difference]: Without dead ends: 45 [2020-12-23 01:07:32,168 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=162, Invalid=218, Unknown=0, NotChecked=0, Total=380 [2020-12-23 01:07:32,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-12-23 01:07:32,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-12-23 01:07:32,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-23 01:07:32,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-12-23 01:07:32,184 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 39 [2020-12-23 01:07:32,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:32,185 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-12-23 01:07:32,185 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 01:07:32,185 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-12-23 01:07:32,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-23 01:07:32,186 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:32,186 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:32,395 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-23 01:07:32,396 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:32,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:32,397 INFO L82 PathProgramCache]: Analyzing trace with hash 982747381, now seen corresponding path program 9 times [2020-12-23 01:07:32,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:32,398 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376417864] [2020-12-23 01:07:32,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:32,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:32,560 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 01:07:32,561 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376417864] [2020-12-23 01:07:32,561 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940373959] [2020-12-23 01:07:32,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:33,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2020-12-23 01:07:33,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:07:33,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 01:07:33,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:33,271 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-23 01:07:33,271 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:33,271 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2020-12-23 01:07:33,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129311589] [2020-12-23 01:07:33,272 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 01:07:33,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:33,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 01:07:33,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=240, Unknown=0, NotChecked=0, Total=420 [2020-12-23 01:07:33,274 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 21 states. [2020-12-23 01:07:33,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:33,518 INFO L93 Difference]: Finished difference Result 131 states and 138 transitions. [2020-12-23 01:07:33,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 01:07:33,519 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 41 [2020-12-23 01:07:33,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:33,520 INFO L225 Difference]: With dead ends: 131 [2020-12-23 01:07:33,520 INFO L226 Difference]: Without dead ends: 108 [2020-12-23 01:07:33,521 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=208, Invalid=298, Unknown=0, NotChecked=0, Total=506 [2020-12-23 01:07:33,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-12-23 01:07:33,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 52. [2020-12-23 01:07:33,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-23 01:07:33,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-12-23 01:07:33,529 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 41 [2020-12-23 01:07:33,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:33,529 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-12-23 01:07:33,529 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 01:07:33,529 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-12-23 01:07:33,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-23 01:07:33,530 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:33,530 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:33,745 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:33,746 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:33,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:33,747 INFO L82 PathProgramCache]: Analyzing trace with hash 407457837, now seen corresponding path program 10 times [2020-12-23 01:07:33,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:33,748 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147212644] [2020-12-23 01:07:33,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:33,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:33,929 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 01:07:33,929 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147212644] [2020-12-23 01:07:33,930 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701161749] [2020-12-23 01:07:33,930 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:35,331 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 01:07:35,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:07:35,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 01:07:35,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:35,583 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 01:07:35,583 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:35,583 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-12-23 01:07:35,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923265542] [2020-12-23 01:07:35,584 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 01:07:35,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:35,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 01:07:35,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=321, Unknown=0, NotChecked=0, Total=552 [2020-12-23 01:07:35,585 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 24 states. [2020-12-23 01:07:35,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:35,721 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2020-12-23 01:07:35,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 01:07:35,721 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2020-12-23 01:07:35,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:35,722 INFO L225 Difference]: With dead ends: 84 [2020-12-23 01:07:35,722 INFO L226 Difference]: Without dead ends: 55 [2020-12-23 01:07:35,724 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=321, Unknown=0, NotChecked=0, Total=552 [2020-12-23 01:07:35,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-12-23 01:07:35,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2020-12-23 01:07:35,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-23 01:07:35,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-12-23 01:07:35,731 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 49 [2020-12-23 01:07:35,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:35,731 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-12-23 01:07:35,731 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 01:07:35,731 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-12-23 01:07:35,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-23 01:07:35,732 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:35,733 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:35,946 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:35,947 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:35,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:35,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1964369771, now seen corresponding path program 11 times [2020-12-23 01:07:35,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:35,949 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191295002] [2020-12-23 01:07:35,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:35,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:36,170 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 01:07:36,171 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191295002] [2020-12-23 01:07:36,171 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962384090] [2020-12-23 01:07:36,171 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:07:58,560 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-23 01:07:58,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:07:58,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 01:07:58,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:07:58,896 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 01:07:58,896 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:07:58,896 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-12-23 01:07:58,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258605506] [2020-12-23 01:07:58,901 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-23 01:07:58,901 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:07:58,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-23 01:07:58,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=380, Unknown=0, NotChecked=0, Total=650 [2020-12-23 01:07:58,904 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 26 states. [2020-12-23 01:07:59,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:07:59,029 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2020-12-23 01:07:59,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 01:07:59,029 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 51 [2020-12-23 01:07:59,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:07:59,032 INFO L225 Difference]: With dead ends: 86 [2020-12-23 01:07:59,033 INFO L226 Difference]: Without dead ends: 57 [2020-12-23 01:07:59,035 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=270, Invalid=380, Unknown=0, NotChecked=0, Total=650 [2020-12-23 01:07:59,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-12-23 01:07:59,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2020-12-23 01:07:59,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-23 01:07:59,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-12-23 01:07:59,046 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2020-12-23 01:07:59,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:07:59,046 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-12-23 01:07:59,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-23 01:07:59,047 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-12-23 01:07:59,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-23 01:07:59,051 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:07:59,052 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:07:59,252 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 01:07:59,253 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:07:59,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:07:59,254 INFO L82 PathProgramCache]: Analyzing trace with hash -786847959, now seen corresponding path program 12 times [2020-12-23 01:07:59,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:07:59,255 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732787562] [2020-12-23 01:07:59,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:07:59,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:07:59,499 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 01:07:59,500 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732787562] [2020-12-23 01:07:59,500 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166267940] [2020-12-23 01:07:59,500 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:08:01,709 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-23 01:08:01,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:08:01,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 01:08:01,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:08:01,977 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-23 01:08:01,978 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:08:01,978 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 27 [2020-12-23 01:08:01,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883684891] [2020-12-23 01:08:01,979 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-23 01:08:01,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:08:01,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-23 01:08:01,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=408, Unknown=0, NotChecked=0, Total=702 [2020-12-23 01:08:01,980 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 27 states. [2020-12-23 01:08:02,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:08:02,296 INFO L93 Difference]: Finished difference Result 167 states and 174 transitions. [2020-12-23 01:08:02,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 01:08:02,297 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 53 [2020-12-23 01:08:02,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:08:02,298 INFO L225 Difference]: With dead ends: 167 [2020-12-23 01:08:02,298 INFO L226 Difference]: Without dead ends: 138 [2020-12-23 01:08:02,300 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=328, Invalid=484, Unknown=0, NotChecked=0, Total=812 [2020-12-23 01:08:02,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-12-23 01:08:02,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 64. [2020-12-23 01:08:02,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-23 01:08:02,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-12-23 01:08:02,306 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 53 [2020-12-23 01:08:02,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:08:02,307 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-12-23 01:08:02,307 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-23 01:08:02,307 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-12-23 01:08:02,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-23 01:08:02,308 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:08:02,308 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:08:02,522 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 01:08:02,523 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:08:02,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:08:02,524 INFO L82 PathProgramCache]: Analyzing trace with hash -1380005279, now seen corresponding path program 13 times [2020-12-23 01:08:02,524 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:08:02,524 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037109599] [2020-12-23 01:08:02,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:08:02,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:08:02,753 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-23 01:08:02,754 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037109599] [2020-12-23 01:08:02,754 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958499602] [2020-12-23 01:08:02,754 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:08:02,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:08:02,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 01:08:02,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:08:03,149 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-23 01:08:03,149 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:08:03,150 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2020-12-23 01:08:03,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898149381] [2020-12-23 01:08:03,151 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-23 01:08:03,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:08:03,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-23 01:08:03,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-12-23 01:08:03,153 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 30 states. [2020-12-23 01:08:03,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:08:03,318 INFO L93 Difference]: Finished difference Result 102 states and 106 transitions. [2020-12-23 01:08:03,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 01:08:03,318 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 61 [2020-12-23 01:08:03,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:08:03,319 INFO L225 Difference]: With dead ends: 102 [2020-12-23 01:08:03,319 INFO L226 Difference]: Without dead ends: 67 [2020-12-23 01:08:03,320 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-12-23 01:08:03,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-23 01:08:03,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2020-12-23 01:08:03,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-23 01:08:03,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-12-23 01:08:03,325 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 61 [2020-12-23 01:08:03,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:08:03,325 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-12-23 01:08:03,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-23 01:08:03,326 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-12-23 01:08:03,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-23 01:08:03,326 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:08:03,327 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:08:03,531 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-23 01:08:03,531 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:08:03,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:08:03,533 INFO L82 PathProgramCache]: Analyzing trace with hash 1159492767, now seen corresponding path program 14 times [2020-12-23 01:08:03,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:08:03,533 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172074504] [2020-12-23 01:08:03,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:08:03,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:08:03,807 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-23 01:08:03,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172074504] [2020-12-23 01:08:03,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76028469] [2020-12-23 01:08:03,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:08:03,885 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 01:08:03,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:08:03,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-23 01:08:03,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:08:04,217 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-23 01:08:04,217 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:08:04,218 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 32 [2020-12-23 01:08:04,218 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228896278] [2020-12-23 01:08:04,219 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-23 01:08:04,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:08:04,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-23 01:08:04,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=587, Unknown=0, NotChecked=0, Total=992 [2020-12-23 01:08:04,221 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 32 states. [2020-12-23 01:08:04,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:08:04,311 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2020-12-23 01:08:04,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-23 01:08:04,312 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 63 [2020-12-23 01:08:04,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:08:04,313 INFO L225 Difference]: With dead ends: 104 [2020-12-23 01:08:04,313 INFO L226 Difference]: Without dead ends: 69 [2020-12-23 01:08:04,314 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=405, Invalid=587, Unknown=0, NotChecked=0, Total=992 [2020-12-23 01:08:04,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-12-23 01:08:04,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2020-12-23 01:08:04,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-23 01:08:04,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-23 01:08:04,319 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2020-12-23 01:08:04,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:08:04,320 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-23 01:08:04,320 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-23 01:08:04,320 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-23 01:08:04,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-23 01:08:04,321 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:08:04,321 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:08:04,532 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:08:04,533 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:08:04,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:08:04,534 INFO L82 PathProgramCache]: Analyzing trace with hash 2075690845, now seen corresponding path program 15 times [2020-12-23 01:08:04,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:08:04,534 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942976983] [2020-12-23 01:08:04,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:08:04,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:08:04,807 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2020-12-23 01:08:04,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942976983] [2020-12-23 01:08:04,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085359711] [2020-12-23 01:08:04,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:08:10,617 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2020-12-23 01:08:10,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:08:10,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 01:08:10,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:08:10,984 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-23 01:08:10,985 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:08:10,985 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 33 [2020-12-23 01:08:10,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947400754] [2020-12-23 01:08:10,986 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-12-23 01:08:10,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:08:10,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-12-23 01:08:10,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=621, Unknown=0, NotChecked=0, Total=1056 [2020-12-23 01:08:10,988 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 33 states. [2020-12-23 01:08:11,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:08:11,386 INFO L93 Difference]: Finished difference Result 203 states and 210 transitions. [2020-12-23 01:08:11,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 01:08:11,387 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 65 [2020-12-23 01:08:11,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:08:11,389 INFO L225 Difference]: With dead ends: 203 [2020-12-23 01:08:11,389 INFO L226 Difference]: Without dead ends: 168 [2020-12-23 01:08:11,390 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=475, Invalid=715, Unknown=0, NotChecked=0, Total=1190 [2020-12-23 01:08:11,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-12-23 01:08:11,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 76. [2020-12-23 01:08:11,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-23 01:08:11,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-12-23 01:08:11,396 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 65 [2020-12-23 01:08:11,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:08:11,396 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-12-23 01:08:11,396 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-12-23 01:08:11,396 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-12-23 01:08:11,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-23 01:08:11,397 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:08:11,397 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:08:11,622 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 01:08:11,623 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:08:11,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:08:11,624 INFO L82 PathProgramCache]: Analyzing trace with hash -1894840683, now seen corresponding path program 16 times [2020-12-23 01:08:11,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:08:11,625 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139298599] [2020-12-23 01:08:11,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:08:11,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:08:12,003 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-23 01:08:12,003 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139298599] [2020-12-23 01:08:12,003 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709890902] [2020-12-23 01:08:12,003 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 01:08:22,675 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 01:08:22,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 01:08:22,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 01:08:22,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 01:08:23,150 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-23 01:08:23,151 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 01:08:23,151 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-12-23 01:08:23,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749808341] [2020-12-23 01:08:23,152 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-12-23 01:08:23,152 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 01:08:23,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-12-23 01:08:23,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=510, Invalid=750, Unknown=0, NotChecked=0, Total=1260 [2020-12-23 01:08:23,153 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 36 states. [2020-12-23 01:08:23,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 01:08:23,384 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2020-12-23 01:08:23,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 01:08:23,384 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 73 [2020-12-23 01:08:23,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 01:08:23,386 INFO L225 Difference]: With dead ends: 120 [2020-12-23 01:08:23,386 INFO L226 Difference]: Without dead ends: 79 [2020-12-23 01:08:23,387 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 525 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=510, Invalid=750, Unknown=0, NotChecked=0, Total=1260 [2020-12-23 01:08:23,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-12-23 01:08:23,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2020-12-23 01:08:23,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-12-23 01:08:23,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-12-23 01:08:23,393 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 73 [2020-12-23 01:08:23,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 01:08:23,393 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-12-23 01:08:23,393 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-12-23 01:08:23,393 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-12-23 01:08:23,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-12-23 01:08:23,394 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 01:08:23,394 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 01:08:23,595 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 01:08:23,595 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 01:08:23,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 01:08:23,596 INFO L82 PathProgramCache]: Analyzing trace with hash -923188269, now seen corresponding path program 17 times [2020-12-23 01:08:23,596 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 01:08:23,597 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439396278] [2020-12-23 01:08:23,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 01:08:23,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 01:08:23,914 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-23 01:08:23,915 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439396278] [2020-12-23 01:08:23,915 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181985633] [2020-12-23 01:08:23,915 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true