/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_two_index_01.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 00:12:05,339 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 00:12:05,345 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 00:12:05,384 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 00:12:05,385 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 00:12:05,387 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 00:12:05,389 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 00:12:05,392 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 00:12:05,394 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 00:12:05,396 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 00:12:05,397 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 00:12:05,399 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 00:12:05,400 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 00:12:05,401 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 00:12:05,403 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 00:12:05,405 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 00:12:05,406 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 00:12:05,407 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 00:12:05,432 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 00:12:05,442 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 00:12:05,448 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 00:12:05,449 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 00:12:05,452 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 00:12:05,456 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 00:12:05,466 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 00:12:05,495 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 00:12:05,498 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 00:12:05,499 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 00:12:05,505 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 00:12:05,569 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 00:12:05,569 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 00:12:05,575 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 00:12:05,576 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 00:12:05,576 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 00:12:05,577 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 00:12:05,577 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 00:12:05,577 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 00:12:05,577 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 00:12:05,578 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 00:12:05,579 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 00:12:05,579 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 00:12:05,580 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 00:12:05,580 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 00:12:05,580 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 00:12:05,580 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 00:12:05,581 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 00:12:05,581 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 00:12:05,581 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 00:12:05,581 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 00:12:05,581 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 00:12:05,582 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 00:12:05,582 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 00:12:05,582 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 00:12:05,582 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 00:12:05,583 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 00:12:06,022 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 00:12:06,061 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 00:12:06,064 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 00:12:06,066 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 00:12:06,067 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 00:12:06,068 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_01.i [2020-12-23 00:12:06,189 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/e5ba9eac1/8d4303c7c26c4327b1bc73debec3cc08/FLAG45826cbf4 [2020-12-23 00:12:06,878 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 00:12:06,879 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_01.i [2020-12-23 00:12:06,889 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/e5ba9eac1/8d4303c7c26c4327b1bc73debec3cc08/FLAG45826cbf4 [2020-12-23 00:12:07,229 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/e5ba9eac1/8d4303c7c26c4327b1bc73debec3cc08 [2020-12-23 00:12:07,233 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 00:12:07,236 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 00:12:07,238 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 00:12:07,239 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 00:12:07,243 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 00:12:07,244 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,248 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@794d1709 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07, skipping insertion in model container [2020-12-23 00:12:07,249 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,260 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 00:12:07,281 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 00:12:07,474 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_01.i[814,827] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~b~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~j~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2020-12-23 00:12:07,520 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:12:07,537 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 00:12:07,559 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_01.i[814,827] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#b~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#b~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~j~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2020-12-23 00:12:07,584 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:12:07,617 INFO L208 MainTranslator]: Completed translation [2020-12-23 00:12:07,619 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07 WrapperNode [2020-12-23 00:12:07,619 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 00:12:07,622 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 00:12:07,622 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 00:12:07,622 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 00:12:07,634 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,648 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,673 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 00:12:07,674 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 00:12:07,675 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 00:12:07,675 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 00:12:07,686 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,686 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,689 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,696 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,702 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,704 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... [2020-12-23 00:12:07,707 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 00:12:07,708 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 00:12:07,709 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 00:12:07,709 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 00:12:07,710 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 00:12:07,836 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 00:12:07,837 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 00:12:07,837 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 00:12:07,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 00:12:07,837 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 00:12:07,837 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 00:12:07,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 00:12:08,245 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 00:12:08,245 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 00:12:08,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:12:08 BoogieIcfgContainer [2020-12-23 00:12:08,250 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 00:12:08,275 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 00:12:08,276 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 00:12:08,285 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 00:12:08,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 12:12:07" (1/3) ... [2020-12-23 00:12:08,288 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fa300d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:12:08, skipping insertion in model container [2020-12-23 00:12:08,288 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:07" (2/3) ... [2020-12-23 00:12:08,289 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fa300d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:12:08, skipping insertion in model container [2020-12-23 00:12:08,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:12:08" (3/3) ... [2020-12-23 00:12:08,291 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_01.i [2020-12-23 00:12:08,302 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 00:12:08,307 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 00:12:08,347 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 00:12:08,397 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 00:12:08,397 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 00:12:08,397 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 00:12:08,398 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 00:12:08,398 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 00:12:08,398 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 00:12:08,398 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 00:12:08,398 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 00:12:08,425 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-12-23 00:12:08,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 00:12:08,436 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:08,437 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:08,438 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:08,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:08,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2020-12-23 00:12:08,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:08,465 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371887475] [2020-12-23 00:12:08,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:08,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:08,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 00:12:08,755 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371887475] [2020-12-23 00:12:08,756 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:12:08,756 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 00:12:08,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323094108] [2020-12-23 00:12:08,761 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:12:08,762 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:08,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:12:08,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:12:08,786 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2020-12-23 00:12:08,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:08,886 INFO L93 Difference]: Finished difference Result 34 states and 51 transitions. [2020-12-23 00:12:08,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:12:08,888 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-23 00:12:08,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:08,900 INFO L225 Difference]: With dead ends: 34 [2020-12-23 00:12:08,900 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 00:12:08,903 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:12:08,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 00:12:08,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2020-12-23 00:12:08,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-23 00:12:08,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-12-23 00:12:08,953 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 9 [2020-12-23 00:12:08,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:08,954 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-12-23 00:12:08,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:12:08,955 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-12-23 00:12:08,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 00:12:08,955 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:08,956 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:08,956 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 00:12:08,956 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:08,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:08,957 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2020-12-23 00:12:08,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:08,958 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829602674] [2020-12-23 00:12:08,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:09,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:09,072 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:12:09,073 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829602674] [2020-12-23 00:12:09,073 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548827127] [2020-12-23 00:12:09,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:09,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:09,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 00:12:09,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:09,302 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:12:09,302 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:09,303 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 00:12:09,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101746935] [2020-12-23 00:12:09,308 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 00:12:09,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:09,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 00:12:09,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:12:09,325 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 5 states. [2020-12-23 00:12:09,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:09,406 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-12-23 00:12:09,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 00:12:09,407 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-23 00:12:09,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:09,408 INFO L225 Difference]: With dead ends: 34 [2020-12-23 00:12:09,408 INFO L226 Difference]: Without dead ends: 25 [2020-12-23 00:12:09,410 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:12:09,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-23 00:12:09,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 15. [2020-12-23 00:12:09,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-23 00:12:09,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-23 00:12:09,415 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2020-12-23 00:12:09,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:09,415 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-23 00:12:09,416 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 00:12:09,416 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-23 00:12:09,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-23 00:12:09,416 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:09,417 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:09,633 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 00:12:09,635 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:09,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:09,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1117999992, now seen corresponding path program 2 times [2020-12-23 00:12:09,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:09,637 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275672777] [2020-12-23 00:12:09,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:09,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:09,710 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-23 00:12:09,710 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275672777] [2020-12-23 00:12:09,711 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547889240] [2020-12-23 00:12:09,711 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:09,779 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:09,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:09,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:12:09,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:09,815 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-23 00:12:09,816 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:09,816 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 00:12:09,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103258214] [2020-12-23 00:12:09,817 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 00:12:09,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:09,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 00:12:09,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:12:09,818 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 6 states. [2020-12-23 00:12:09,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:09,870 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-12-23 00:12:09,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 00:12:09,871 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-12-23 00:12:09,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:09,872 INFO L225 Difference]: With dead ends: 42 [2020-12-23 00:12:09,872 INFO L226 Difference]: Without dead ends: 32 [2020-12-23 00:12:09,873 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:12:09,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-23 00:12:09,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 17. [2020-12-23 00:12:09,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 00:12:09,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-23 00:12:09,878 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2020-12-23 00:12:09,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:09,879 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-23 00:12:09,879 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 00:12:09,879 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-23 00:12:09,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 00:12:09,880 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:09,880 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:10,094 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:10,095 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:10,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:10,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1025155465, now seen corresponding path program 3 times [2020-12-23 00:12:10,098 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:10,098 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470064530] [2020-12-23 00:12:10,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:10,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:10,228 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:12:10,228 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470064530] [2020-12-23 00:12:10,229 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37364937] [2020-12-23 00:12:10,229 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:10,321 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-23 00:12:10,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:10,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 00:12:10,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:10,412 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:12:10,412 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:10,412 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 00:12:10,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013710892] [2020-12-23 00:12:10,414 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 00:12:10,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:10,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 00:12:10,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:12:10,416 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 7 states. [2020-12-23 00:12:10,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:10,496 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-12-23 00:12:10,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 00:12:10,497 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-12-23 00:12:10,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:10,500 INFO L225 Difference]: With dead ends: 50 [2020-12-23 00:12:10,501 INFO L226 Difference]: Without dead ends: 39 [2020-12-23 00:12:10,503 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:12:10,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-23 00:12:10,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 19. [2020-12-23 00:12:10,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-23 00:12:10,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-12-23 00:12:10,517 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2020-12-23 00:12:10,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:10,518 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-12-23 00:12:10,518 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 00:12:10,518 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-12-23 00:12:10,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-23 00:12:10,519 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:10,519 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:10,730 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:10,731 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:10,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:10,733 INFO L82 PathProgramCache]: Analyzing trace with hash -57020904, now seen corresponding path program 4 times [2020-12-23 00:12:10,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:10,734 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403001324] [2020-12-23 00:12:10,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:10,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:10,872 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:10,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403001324] [2020-12-23 00:12:10,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558181847] [2020-12-23 00:12:10,873 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:10,932 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:12:10,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:10,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 00:12:10,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:10,996 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:10,997 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:10,997 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 00:12:10,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177474022] [2020-12-23 00:12:10,998 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 00:12:10,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:10,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 00:12:11,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 00:12:11,001 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-12-23 00:12:11,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:11,065 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-12-23 00:12:11,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 00:12:11,066 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-12-23 00:12:11,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:11,067 INFO L225 Difference]: With dead ends: 58 [2020-12-23 00:12:11,067 INFO L226 Difference]: Without dead ends: 46 [2020-12-23 00:12:11,068 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 00:12:11,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-23 00:12:11,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 21. [2020-12-23 00:12:11,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-23 00:12:11,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-12-23 00:12:11,073 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2020-12-23 00:12:11,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:11,073 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-12-23 00:12:11,073 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 00:12:11,073 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-12-23 00:12:11,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-23 00:12:11,074 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:11,074 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:11,287 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:11,288 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:11,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:11,290 INFO L82 PathProgramCache]: Analyzing trace with hash 315153751, now seen corresponding path program 5 times [2020-12-23 00:12:11,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:11,291 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138345021] [2020-12-23 00:12:11,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:11,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:11,428 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-23 00:12:11,429 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138345021] [2020-12-23 00:12:11,429 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131009988] [2020-12-23 00:12:11,429 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:11,575 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-23 00:12:11,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:11,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 00:12:11,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:11,626 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-23 00:12:11,627 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:11,627 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 00:12:11,628 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281986339] [2020-12-23 00:12:11,628 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 00:12:11,628 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:11,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 00:12:11,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:12:11,629 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 9 states. [2020-12-23 00:12:11,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:11,688 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-12-23 00:12:11,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 00:12:11,689 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-12-23 00:12:11,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:11,690 INFO L225 Difference]: With dead ends: 66 [2020-12-23 00:12:11,690 INFO L226 Difference]: Without dead ends: 53 [2020-12-23 00:12:11,691 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:12:11,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-23 00:12:11,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 23. [2020-12-23 00:12:11,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 00:12:11,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-12-23 00:12:11,696 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2020-12-23 00:12:11,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:11,696 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-12-23 00:12:11,697 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 00:12:11,697 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-12-23 00:12:11,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-23 00:12:11,697 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:11,698 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:11,911 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 00:12:11,912 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:11,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:11,913 INFO L82 PathProgramCache]: Analyzing trace with hash -846090056, now seen corresponding path program 6 times [2020-12-23 00:12:11,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:11,914 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106736530] [2020-12-23 00:12:11,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:11,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:12,029 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-23 00:12:12,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106736530] [2020-12-23 00:12:12,030 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394943913] [2020-12-23 00:12:12,030 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:12,254 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-23 00:12:12,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:12,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-23 00:12:12,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:12,346 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-23 00:12:12,347 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:12,347 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-23 00:12:12,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681184670] [2020-12-23 00:12:12,348 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 00:12:12,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:12,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 00:12:12,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-23 00:12:12,351 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 10 states. [2020-12-23 00:12:12,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:12,453 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-12-23 00:12:12,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 00:12:12,454 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2020-12-23 00:12:12,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:12,455 INFO L225 Difference]: With dead ends: 74 [2020-12-23 00:12:12,455 INFO L226 Difference]: Without dead ends: 60 [2020-12-23 00:12:12,456 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-23 00:12:12,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-23 00:12:12,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 25. [2020-12-23 00:12:12,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-23 00:12:12,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-12-23 00:12:12,461 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2020-12-23 00:12:12,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:12,462 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-12-23 00:12:12,462 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 00:12:12,462 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-12-23 00:12:12,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-23 00:12:12,463 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:12,463 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:12,664 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:12,665 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:12,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:12,666 INFO L82 PathProgramCache]: Analyzing trace with hash 401699895, now seen corresponding path program 7 times [2020-12-23 00:12:12,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:12,667 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106512537] [2020-12-23 00:12:12,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:12,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:12,862 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-23 00:12:12,862 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106512537] [2020-12-23 00:12:12,863 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624417646] [2020-12-23 00:12:12,863 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:12,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:12,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 00:12:12,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:13,005 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-23 00:12:13,006 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:13,006 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-23 00:12:13,007 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703994219] [2020-12-23 00:12:13,007 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 00:12:13,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:13,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 00:12:13,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:12:13,009 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 11 states. [2020-12-23 00:12:13,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:13,117 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-12-23 00:12:13,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 00:12:13,118 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2020-12-23 00:12:13,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:13,119 INFO L225 Difference]: With dead ends: 82 [2020-12-23 00:12:13,119 INFO L226 Difference]: Without dead ends: 67 [2020-12-23 00:12:13,120 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:12:13,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-23 00:12:13,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 27. [2020-12-23 00:12:13,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-23 00:12:13,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-12-23 00:12:13,126 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2020-12-23 00:12:13,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:13,127 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-12-23 00:12:13,127 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 00:12:13,127 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-12-23 00:12:13,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-23 00:12:13,128 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:13,128 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:13,341 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:13,342 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:13,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:13,343 INFO L82 PathProgramCache]: Analyzing trace with hash -88564904, now seen corresponding path program 8 times [2020-12-23 00:12:13,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:13,345 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408630852] [2020-12-23 00:12:13,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:13,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:13,468 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 00:12:13,469 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408630852] [2020-12-23 00:12:13,470 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592906834] [2020-12-23 00:12:13,470 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:13,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:13,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:13,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 00:12:13,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:13,606 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 00:12:13,607 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:13,607 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 00:12:13,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579556989] [2020-12-23 00:12:13,608 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 00:12:13,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:13,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 00:12:13,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:12:13,610 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2020-12-23 00:12:13,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:13,713 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-12-23 00:12:13,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 00:12:13,713 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-12-23 00:12:13,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:13,714 INFO L225 Difference]: With dead ends: 90 [2020-12-23 00:12:13,714 INFO L226 Difference]: Without dead ends: 74 [2020-12-23 00:12:13,715 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:12:13,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-12-23 00:12:13,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 29. [2020-12-23 00:12:13,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-23 00:12:13,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-12-23 00:12:13,721 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2020-12-23 00:12:13,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:13,721 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-12-23 00:12:13,721 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 00:12:13,721 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-12-23 00:12:13,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-23 00:12:13,722 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:13,722 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:13,936 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-23 00:12:13,937 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:13,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:13,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1068424425, now seen corresponding path program 9 times [2020-12-23 00:12:13,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:13,939 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158162632] [2020-12-23 00:12:13,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:13,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:14,106 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-23 00:12:14,107 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158162632] [2020-12-23 00:12:14,108 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631756722] [2020-12-23 00:12:14,108 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:14,673 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-23 00:12:14,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:14,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-23 00:12:14,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:14,789 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-23 00:12:14,789 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:14,789 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-23 00:12:14,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782633812] [2020-12-23 00:12:14,793 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 00:12:14,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:14,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 00:12:14,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:12:14,800 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 13 states. [2020-12-23 00:12:14,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:14,909 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-12-23 00:12:14,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 00:12:14,909 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2020-12-23 00:12:14,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:14,911 INFO L225 Difference]: With dead ends: 98 [2020-12-23 00:12:14,911 INFO L226 Difference]: Without dead ends: 81 [2020-12-23 00:12:14,914 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:12:14,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-12-23 00:12:14,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 31. [2020-12-23 00:12:14,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-23 00:12:14,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-12-23 00:12:14,930 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2020-12-23 00:12:14,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:14,930 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-12-23 00:12:14,930 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 00:12:14,931 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-12-23 00:12:14,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-23 00:12:14,935 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:14,935 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:15,150 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:15,151 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:15,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:15,152 INFO L82 PathProgramCache]: Analyzing trace with hash 163360248, now seen corresponding path program 10 times [2020-12-23 00:12:15,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:15,152 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192048500] [2020-12-23 00:12:15,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:15,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:15,286 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-23 00:12:15,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192048500] [2020-12-23 00:12:15,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724017169] [2020-12-23 00:12:15,288 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:15,363 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:12:15,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:15,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-23 00:12:15,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:15,417 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-23 00:12:15,418 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:15,418 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-23 00:12:15,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095852831] [2020-12-23 00:12:15,419 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 00:12:15,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:15,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 00:12:15,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-23 00:12:15,420 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 14 states. [2020-12-23 00:12:15,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:15,536 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-12-23 00:12:15,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 00:12:15,537 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2020-12-23 00:12:15,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:15,538 INFO L225 Difference]: With dead ends: 106 [2020-12-23 00:12:15,538 INFO L226 Difference]: Without dead ends: 88 [2020-12-23 00:12:15,539 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-23 00:12:15,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-12-23 00:12:15,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 33. [2020-12-23 00:12:15,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-23 00:12:15,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-12-23 00:12:15,545 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2020-12-23 00:12:15,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:15,546 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-12-23 00:12:15,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 00:12:15,546 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-12-23 00:12:15,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-23 00:12:15,546 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:15,547 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:15,761 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:15,762 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:15,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:15,763 INFO L82 PathProgramCache]: Analyzing trace with hash 425322999, now seen corresponding path program 11 times [2020-12-23 00:12:15,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:15,766 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667229999] [2020-12-23 00:12:15,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:15,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:15,957 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-23 00:12:15,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667229999] [2020-12-23 00:12:15,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072902981] [2020-12-23 00:12:15,958 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:18,959 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2020-12-23 00:12:18,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:18,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 00:12:18,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:19,027 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-23 00:12:19,028 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:19,028 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-23 00:12:19,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622485930] [2020-12-23 00:12:19,029 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 00:12:19,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:19,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 00:12:19,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:12:19,030 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 15 states. [2020-12-23 00:12:19,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:19,134 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-12-23 00:12:19,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 00:12:19,134 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2020-12-23 00:12:19,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:19,136 INFO L225 Difference]: With dead ends: 114 [2020-12-23 00:12:19,136 INFO L226 Difference]: Without dead ends: 95 [2020-12-23 00:12:19,137 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:12:19,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-12-23 00:12:19,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 35. [2020-12-23 00:12:19,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-23 00:12:19,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-12-23 00:12:19,142 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2020-12-23 00:12:19,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:19,143 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-12-23 00:12:19,143 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 00:12:19,143 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-12-23 00:12:19,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-23 00:12:19,143 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:19,144 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:19,344 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 00:12:19,345 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:19,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:19,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1597249384, now seen corresponding path program 12 times [2020-12-23 00:12:19,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:19,346 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380722903] [2020-12-23 00:12:19,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:19,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:19,505 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:12:19,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380722903] [2020-12-23 00:12:19,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022189024] [2020-12-23 00:12:19,505 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:20,764 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 00:12:20,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:20,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 00:12:20,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:20,843 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:12:20,843 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:20,843 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-23 00:12:20,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166208291] [2020-12-23 00:12:20,844 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 00:12:20,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:20,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 00:12:20,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:12:20,846 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 16 states. [2020-12-23 00:12:20,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:20,954 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-12-23 00:12:20,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:12:20,955 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2020-12-23 00:12:20,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:20,956 INFO L225 Difference]: With dead ends: 122 [2020-12-23 00:12:20,956 INFO L226 Difference]: Without dead ends: 102 [2020-12-23 00:12:20,957 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:12:20,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-12-23 00:12:20,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 37. [2020-12-23 00:12:20,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-23 00:12:20,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-12-23 00:12:20,962 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 33 [2020-12-23 00:12:20,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:20,962 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-12-23 00:12:20,962 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 00:12:20,962 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-12-23 00:12:20,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-23 00:12:20,963 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:20,963 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:21,176 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 00:12:21,177 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:21,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:21,178 INFO L82 PathProgramCache]: Analyzing trace with hash 1878902999, now seen corresponding path program 13 times [2020-12-23 00:12:21,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:21,178 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1755257422] [2020-12-23 00:12:21,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:21,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:21,409 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-23 00:12:21,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1755257422] [2020-12-23 00:12:21,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373457578] [2020-12-23 00:12:21,410 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:21,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:21,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-23 00:12:21,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:21,564 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-23 00:12:21,564 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:21,565 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-23 00:12:21,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287711588] [2020-12-23 00:12:21,565 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 00:12:21,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:21,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 00:12:21,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:12:21,567 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 17 states. [2020-12-23 00:12:21,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:21,687 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-12-23 00:12:21,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 00:12:21,688 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2020-12-23 00:12:21,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:21,689 INFO L225 Difference]: With dead ends: 130 [2020-12-23 00:12:21,689 INFO L226 Difference]: Without dead ends: 109 [2020-12-23 00:12:21,689 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:12:21,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-12-23 00:12:21,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 39. [2020-12-23 00:12:21,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-23 00:12:21,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-12-23 00:12:21,694 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2020-12-23 00:12:21,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:21,694 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-12-23 00:12:21,694 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 00:12:21,695 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-12-23 00:12:21,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-23 00:12:21,695 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:21,695 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:21,908 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 00:12:21,909 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:21,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:21,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1720994616, now seen corresponding path program 14 times [2020-12-23 00:12:21,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:21,911 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776066083] [2020-12-23 00:12:21,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:21,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:22,103 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-23 00:12:22,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776066083] [2020-12-23 00:12:22,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418065070] [2020-12-23 00:12:22,104 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:22,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:22,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:22,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 00:12:22,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:22,270 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-23 00:12:22,271 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:22,271 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 00:12:22,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82915496] [2020-12-23 00:12:22,272 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 00:12:22,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:22,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 00:12:22,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:12:22,273 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 18 states. [2020-12-23 00:12:22,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:22,415 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-12-23 00:12:22,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-23 00:12:22,416 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2020-12-23 00:12:22,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:22,417 INFO L225 Difference]: With dead ends: 138 [2020-12-23 00:12:22,418 INFO L226 Difference]: Without dead ends: 116 [2020-12-23 00:12:22,421 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:12:22,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-12-23 00:12:22,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 41. [2020-12-23 00:12:22,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-23 00:12:22,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-12-23 00:12:22,436 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2020-12-23 00:12:22,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:22,437 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-12-23 00:12:22,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 00:12:22,437 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-12-23 00:12:22,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-23 00:12:22,441 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:22,441 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:22,659 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:22,660 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:22,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:22,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1890500535, now seen corresponding path program 15 times [2020-12-23 00:12:22,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:22,661 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783886530] [2020-12-23 00:12:22,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:22,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:22,918 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-23 00:12:22,918 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783886530] [2020-12-23 00:12:22,919 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500957156] [2020-12-23 00:12:22,919 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:26,056 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-23 00:12:26,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:26,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-23 00:12:26,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:26,132 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-23 00:12:26,132 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:26,132 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-23 00:12:26,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961287072] [2020-12-23 00:12:26,133 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 00:12:26,133 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:26,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 00:12:26,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:12:26,134 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 19 states. [2020-12-23 00:12:26,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:26,294 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-12-23 00:12:26,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 00:12:26,295 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2020-12-23 00:12:26,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:26,295 INFO L225 Difference]: With dead ends: 146 [2020-12-23 00:12:26,295 INFO L226 Difference]: Without dead ends: 123 [2020-12-23 00:12:26,296 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:12:26,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-12-23 00:12:26,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 43. [2020-12-23 00:12:26,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-23 00:12:26,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2020-12-23 00:12:26,301 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 39 [2020-12-23 00:12:26,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:26,302 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2020-12-23 00:12:26,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 00:12:26,302 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2020-12-23 00:12:26,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-23 00:12:26,302 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:26,303 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:26,517 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 00:12:26,518 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:26,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:26,519 INFO L82 PathProgramCache]: Analyzing trace with hash -498870824, now seen corresponding path program 16 times [2020-12-23 00:12:26,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:26,519 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819601922] [2020-12-23 00:12:26,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:26,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:26,774 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-12-23 00:12:26,774 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819601922] [2020-12-23 00:12:26,775 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788062903] [2020-12-23 00:12:26,775 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:26,847 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:12:26,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:26,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-23 00:12:26,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:26,942 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-12-23 00:12:26,942 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:26,943 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-23 00:12:26,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389026493] [2020-12-23 00:12:26,944 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 00:12:26,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:26,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 00:12:26,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:12:26,947 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 20 states. [2020-12-23 00:12:27,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:27,082 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-12-23 00:12:27,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 00:12:27,082 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2020-12-23 00:12:27,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:27,083 INFO L225 Difference]: With dead ends: 154 [2020-12-23 00:12:27,084 INFO L226 Difference]: Without dead ends: 130 [2020-12-23 00:12:27,085 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:12:27,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-12-23 00:12:27,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 45. [2020-12-23 00:12:27,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-23 00:12:27,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2020-12-23 00:12:27,091 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2020-12-23 00:12:27,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:27,091 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2020-12-23 00:12:27,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 00:12:27,092 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2020-12-23 00:12:27,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-12-23 00:12:27,092 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:27,092 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:27,300 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 00:12:27,301 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:27,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:27,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1197395607, now seen corresponding path program 17 times [2020-12-23 00:12:27,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:27,302 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740414527] [2020-12-23 00:12:27,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:27,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:27,596 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-23 00:12:27,596 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740414527] [2020-12-23 00:12:27,597 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057581716] [2020-12-23 00:12:27,597 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:09,843 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2020-12-23 00:13:09,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:09,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 00:13:09,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:09,963 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-23 00:13:09,964 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:09,964 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-23 00:13:09,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345814341] [2020-12-23 00:13:09,965 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 00:13:09,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:09,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 00:13:09,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:13:09,966 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 21 states. [2020-12-23 00:13:10,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:10,145 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-12-23 00:13:10,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-23 00:13:10,146 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-12-23 00:13:10,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:10,147 INFO L225 Difference]: With dead ends: 162 [2020-12-23 00:13:10,147 INFO L226 Difference]: Without dead ends: 137 [2020-12-23 00:13:10,147 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:13:10,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2020-12-23 00:13:10,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 47. [2020-12-23 00:13:10,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-12-23 00:13:10,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2020-12-23 00:13:10,151 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2020-12-23 00:13:10,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:10,152 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2020-12-23 00:13:10,152 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 00:13:10,152 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2020-12-23 00:13:10,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-23 00:13:10,152 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:10,153 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:10,366 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 00:13:10,367 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:10,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:10,368 INFO L82 PathProgramCache]: Analyzing trace with hash 1535674488, now seen corresponding path program 18 times [2020-12-23 00:13:10,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:10,368 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927163564] [2020-12-23 00:13:10,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:10,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:10,666 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-23 00:13:10,666 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927163564] [2020-12-23 00:13:10,666 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107727477] [2020-12-23 00:13:10,666 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:16,929 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2020-12-23 00:13:16,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:16,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-23 00:13:16,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:17,017 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-23 00:13:17,017 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:17,017 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-23 00:13:17,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733602320] [2020-12-23 00:13:17,028 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-23 00:13:17,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:17,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-23 00:13:17,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-23 00:13:17,030 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 22 states. [2020-12-23 00:13:17,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:17,203 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-12-23 00:13:17,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-23 00:13:17,204 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 45 [2020-12-23 00:13:17,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:17,205 INFO L225 Difference]: With dead ends: 170 [2020-12-23 00:13:17,206 INFO L226 Difference]: Without dead ends: 144 [2020-12-23 00:13:17,207 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-23 00:13:17,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-12-23 00:13:17,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 49. [2020-12-23 00:13:17,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-23 00:13:17,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2020-12-23 00:13:17,211 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 45 [2020-12-23 00:13:17,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:17,211 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2020-12-23 00:13:17,211 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-23 00:13:17,212 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2020-12-23 00:13:17,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:13:17,212 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:17,212 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:17,425 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:17,426 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:17,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:17,426 INFO L82 PathProgramCache]: Analyzing trace with hash -1082133129, now seen corresponding path program 19 times [2020-12-23 00:13:17,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:17,427 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349678123] [2020-12-23 00:13:17,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:17,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:17,789 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-12-23 00:13:17,789 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349678123] [2020-12-23 00:13:17,789 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912414846] [2020-12-23 00:13:17,789 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:17,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:17,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-23 00:13:17,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:17,955 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-12-23 00:13:17,956 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:17,956 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-23 00:13:17,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133502710] [2020-12-23 00:13:17,957 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-23 00:13:17,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:17,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-23 00:13:17,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-23 00:13:17,958 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 23 states. [2020-12-23 00:13:18,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:18,147 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-12-23 00:13:18,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-23 00:13:18,147 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 47 [2020-12-23 00:13:18,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:18,149 INFO L225 Difference]: With dead ends: 178 [2020-12-23 00:13:18,149 INFO L226 Difference]: Without dead ends: 151 [2020-12-23 00:13:18,150 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-23 00:13:18,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-12-23 00:13:18,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 51. [2020-12-23 00:13:18,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-12-23 00:13:18,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2020-12-23 00:13:18,153 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2020-12-23 00:13:18,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:18,154 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2020-12-23 00:13:18,154 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-23 00:13:18,154 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2020-12-23 00:13:18,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-23 00:13:18,155 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:18,155 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:18,368 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:18,369 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:18,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:18,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1164942568, now seen corresponding path program 20 times [2020-12-23 00:13:18,370 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:18,370 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16376637] [2020-12-23 00:13:18,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:18,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:18,732 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-23 00:13:18,732 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16376637] [2020-12-23 00:13:18,732 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474139025] [2020-12-23 00:13:18,733 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:18,826 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:13:18,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:18,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-23 00:13:18,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:18,914 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-23 00:13:18,914 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:18,915 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-23 00:13:18,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103848220] [2020-12-23 00:13:18,917 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 00:13:18,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:18,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 00:13:18,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:13:18,919 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 24 states. [2020-12-23 00:13:19,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:19,089 INFO L93 Difference]: Finished difference Result 186 states and 191 transitions. [2020-12-23 00:13:19,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-23 00:13:19,090 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2020-12-23 00:13:19,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:19,091 INFO L225 Difference]: With dead ends: 186 [2020-12-23 00:13:19,091 INFO L226 Difference]: Without dead ends: 158 [2020-12-23 00:13:19,092 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:13:19,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2020-12-23 00:13:19,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 53. [2020-12-23 00:13:19,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-23 00:13:19,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2020-12-23 00:13:19,096 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2020-12-23 00:13:19,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:19,096 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2020-12-23 00:13:19,096 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 00:13:19,097 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2020-12-23 00:13:19,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-23 00:13:19,097 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:19,097 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:19,309 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-23 00:13:19,310 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:19,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:19,311 INFO L82 PathProgramCache]: Analyzing trace with hash 1677997143, now seen corresponding path program 21 times [2020-12-23 00:13:19,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:19,311 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914397336] [2020-12-23 00:13:19,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:19,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:19,696 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-23 00:13:19,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914397336] [2020-12-23 00:13:19,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064642304] [2020-12-23 00:13:19,696 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:43,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-23 00:13:43,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:43,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-23 00:13:43,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:43,855 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-23 00:13:43,855 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:43,855 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-23 00:13:43,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280889961] [2020-12-23 00:13:43,856 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-23 00:13:43,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:43,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-23 00:13:43,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-23 00:13:43,857 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 25 states. [2020-12-23 00:13:44,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:44,027 INFO L93 Difference]: Finished difference Result 194 states and 199 transitions. [2020-12-23 00:13:44,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-23 00:13:44,028 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 51 [2020-12-23 00:13:44,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:44,030 INFO L225 Difference]: With dead ends: 194 [2020-12-23 00:13:44,030 INFO L226 Difference]: Without dead ends: 165 [2020-12-23 00:13:44,031 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-23 00:13:44,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-12-23 00:13:44,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 55. [2020-12-23 00:13:44,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-12-23 00:13:44,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-12-23 00:13:44,034 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2020-12-23 00:13:44,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:44,035 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-12-23 00:13:44,035 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-23 00:13:44,035 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-12-23 00:13:44,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-23 00:13:44,035 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:44,035 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:44,249 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-23 00:13:44,250 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:44,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:44,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1745446328, now seen corresponding path program 22 times [2020-12-23 00:13:44,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:44,251 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915344684] [2020-12-23 00:13:44,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:44,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:44,646 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-12-23 00:13:44,646 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915344684] [2020-12-23 00:13:44,646 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047214025] [2020-12-23 00:13:44,647 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:44,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:13:44,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:44,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-23 00:13:44,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:44,839 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-12-23 00:13:44,840 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:44,840 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-23 00:13:44,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932779275] [2020-12-23 00:13:44,840 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-23 00:13:44,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:44,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-23 00:13:44,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-23 00:13:44,842 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 26 states. [2020-12-23 00:13:45,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:45,041 INFO L93 Difference]: Finished difference Result 202 states and 207 transitions. [2020-12-23 00:13:45,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-23 00:13:45,042 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 53 [2020-12-23 00:13:45,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:45,043 INFO L225 Difference]: With dead ends: 202 [2020-12-23 00:13:45,043 INFO L226 Difference]: Without dead ends: 172 [2020-12-23 00:13:45,046 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-23 00:13:45,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2020-12-23 00:13:45,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 57. [2020-12-23 00:13:45,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-23 00:13:45,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-12-23 00:13:45,054 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 53 [2020-12-23 00:13:45,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:45,054 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-12-23 00:13:45,054 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-23 00:13:45,054 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-12-23 00:13:45,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-23 00:13:45,055 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:45,055 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:45,268 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:45,269 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:45,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:45,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1621259465, now seen corresponding path program 23 times [2020-12-23 00:13:45,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:45,270 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796335503] [2020-12-23 00:13:45,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:45,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:45,703 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2020-12-23 00:13:45,704 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796335503] [2020-12-23 00:13:45,704 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129366588] [2020-12-23 00:13:45,704 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true