/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_04.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 00:12:08,029 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 00:12:08,034 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 00:12:08,090 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 00:12:08,091 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 00:12:08,096 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 00:12:08,099 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 00:12:08,104 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 00:12:08,119 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 00:12:08,125 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 00:12:08,129 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 00:12:08,131 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 00:12:08,132 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 00:12:08,135 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 00:12:08,138 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 00:12:08,140 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 00:12:08,141 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 00:12:08,145 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 00:12:08,152 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 00:12:08,159 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 00:12:08,163 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 00:12:08,166 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 00:12:08,167 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 00:12:08,168 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 00:12:08,170 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 00:12:08,179 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 00:12:08,180 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 00:12:08,181 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 00:12:08,182 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 00:12:08,207 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 00:12:08,207 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 00:12:08,209 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 00:12:08,209 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 00:12:08,209 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 00:12:08,210 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 00:12:08,210 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 00:12:08,210 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 00:12:08,210 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 00:12:08,211 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 00:12:08,211 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 00:12:08,211 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 00:12:08,211 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 00:12:08,211 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 00:12:08,212 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 00:12:08,212 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 00:12:08,212 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 00:12:08,212 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 00:12:08,213 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 00:12:08,213 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 00:12:08,213 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 00:12:08,213 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 00:12:08,214 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 00:12:08,214 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 00:12:08,214 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 00:12:08,214 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 00:12:08,635 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 00:12:08,662 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 00:12:08,665 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 00:12:08,666 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 00:12:08,667 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 00:12:08,668 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_04.i [2020-12-23 00:12:08,744 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9f3dcd879/d214f5a1121c4b1ba7d285b0a32da183/FLAG9ba091b99 [2020-12-23 00:12:09,295 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 00:12:09,295 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_04.i [2020-12-23 00:12:09,305 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9f3dcd879/d214f5a1121c4b1ba7d285b0a32da183/FLAG9ba091b99 [2020-12-23 00:12:09,665 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9f3dcd879/d214f5a1121c4b1ba7d285b0a32da183 [2020-12-23 00:12:09,673 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 00:12:09,676 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 00:12:09,682 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 00:12:09,682 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 00:12:09,686 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 00:12:09,687 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,689 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f502b87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09, skipping insertion in model container [2020-12-23 00:12:09,690 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,698 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 00:12:09,717 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 00:12:09,866 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_04.i[814,827] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~b~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~j~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2020-12-23 00:12:09,885 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:12:09,894 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 00:12:09,908 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_04.i[814,827] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#b~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#b~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~j~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2020-12-23 00:12:09,917 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:12:09,933 INFO L208 MainTranslator]: Completed translation [2020-12-23 00:12:09,934 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09 WrapperNode [2020-12-23 00:12:09,934 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 00:12:09,935 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 00:12:09,935 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 00:12:09,935 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 00:12:09,943 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,951 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,969 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 00:12:09,970 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 00:12:09,971 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 00:12:09,971 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 00:12:09,980 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,980 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,982 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,983 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,988 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,993 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,994 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... [2020-12-23 00:12:09,996 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 00:12:09,998 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 00:12:09,998 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 00:12:09,998 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 00:12:09,999 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 00:12:10,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 00:12:10,095 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 00:12:10,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 00:12:10,096 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 00:12:10,096 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 00:12:10,096 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 00:12:10,096 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 00:12:10,342 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 00:12:10,342 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 00:12:10,344 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:12:10 BoogieIcfgContainer [2020-12-23 00:12:10,344 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 00:12:10,346 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 00:12:10,346 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 00:12:10,350 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 00:12:10,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 12:12:09" (1/3) ... [2020-12-23 00:12:10,351 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2615b773 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:12:10, skipping insertion in model container [2020-12-23 00:12:10,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:12:09" (2/3) ... [2020-12-23 00:12:10,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2615b773 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:12:10, skipping insertion in model container [2020-12-23 00:12:10,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:12:10" (3/3) ... [2020-12-23 00:12:10,354 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_04.i [2020-12-23 00:12:10,361 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 00:12:10,366 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 00:12:10,389 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 00:12:10,419 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 00:12:10,420 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 00:12:10,420 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 00:12:10,420 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 00:12:10,420 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 00:12:10,420 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 00:12:10,421 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 00:12:10,421 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 00:12:10,441 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-12-23 00:12:10,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 00:12:10,454 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:10,455 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:10,455 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:10,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:10,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2020-12-23 00:12:10,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:10,526 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703361294] [2020-12-23 00:12:10,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:10,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:10,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 00:12:10,716 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703361294] [2020-12-23 00:12:10,717 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:12:10,717 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 00:12:10,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106014590] [2020-12-23 00:12:10,723 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:12:10,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:10,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:12:10,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:12:10,742 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2020-12-23 00:12:10,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:10,781 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2020-12-23 00:12:10,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:12:10,784 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-23 00:12:10,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:10,796 INFO L225 Difference]: With dead ends: 28 [2020-12-23 00:12:10,796 INFO L226 Difference]: Without dead ends: 12 [2020-12-23 00:12:10,800 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:12:10,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-23 00:12:10,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-23 00:12:10,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-23 00:12:10,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2020-12-23 00:12:10,838 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2020-12-23 00:12:10,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:10,838 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2020-12-23 00:12:10,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:12:10,839 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2020-12-23 00:12:10,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 00:12:10,839 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:10,840 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:10,840 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 00:12:10,840 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:10,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:10,841 INFO L82 PathProgramCache]: Analyzing trace with hash 722375763, now seen corresponding path program 1 times [2020-12-23 00:12:10,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:10,842 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325268838] [2020-12-23 00:12:10,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:10,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:10,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 00:12:10,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325268838] [2020-12-23 00:12:10,928 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364706167] [2020-12-23 00:12:10,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:11,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:11,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-23 00:12:11,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:11,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:12:11,053 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-23 00:12:11,053 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2020-12-23 00:12:11,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350588060] [2020-12-23 00:12:11,056 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:12:11,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:11,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:12:11,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 00:12:11,062 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 3 states. [2020-12-23 00:12:11,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:11,098 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-12-23 00:12:11,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:12:11,099 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-12-23 00:12:11,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:11,101 INFO L225 Difference]: With dead ends: 24 [2020-12-23 00:12:11,101 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 00:12:11,104 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 00:12:11,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 00:12:11,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2020-12-23 00:12:11,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-23 00:12:11,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-12-23 00:12:11,112 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2020-12-23 00:12:11,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:11,113 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-12-23 00:12:11,113 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:12:11,113 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-12-23 00:12:11,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 00:12:11,114 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:11,114 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:11,327 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 00:12:11,328 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:11,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:11,330 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2020-12-23 00:12:11,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:11,331 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612998686] [2020-12-23 00:12:11,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:11,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:11,411 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:12:11,411 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612998686] [2020-12-23 00:12:11,412 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013209704] [2020-12-23 00:12:11,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:11,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:11,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 00:12:11,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:11,520 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:12:11,520 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:11,521 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 00:12:11,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344698627] [2020-12-23 00:12:11,521 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 00:12:11,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:11,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 00:12:11,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:12:11,523 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 5 states. [2020-12-23 00:12:11,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:11,550 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2020-12-23 00:12:11,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 00:12:11,550 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-23 00:12:11,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:11,551 INFO L225 Difference]: With dead ends: 28 [2020-12-23 00:12:11,551 INFO L226 Difference]: Without dead ends: 19 [2020-12-23 00:12:11,552 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:12:11,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-23 00:12:11,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2020-12-23 00:12:11,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-23 00:12:11,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-12-23 00:12:11,556 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2020-12-23 00:12:11,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:11,556 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-12-23 00:12:11,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 00:12:11,557 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-12-23 00:12:11,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 00:12:11,557 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:11,557 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:11,770 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:11,771 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:11,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:11,773 INFO L82 PathProgramCache]: Analyzing trace with hash -519784366, now seen corresponding path program 2 times [2020-12-23 00:12:11,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:11,774 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026722016] [2020-12-23 00:12:11,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:11,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:11,825 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-23 00:12:11,825 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026722016] [2020-12-23 00:12:11,826 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185176764] [2020-12-23 00:12:11,826 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:11,882 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:11,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:11,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:12:11,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:11,924 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:12:11,925 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:11,925 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2020-12-23 00:12:11,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410501272] [2020-12-23 00:12:11,926 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 00:12:11,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:11,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 00:12:11,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:12:11,928 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 7 states. [2020-12-23 00:12:11,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:11,976 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2020-12-23 00:12:11,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 00:12:11,976 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-12-23 00:12:11,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:11,977 INFO L225 Difference]: With dead ends: 36 [2020-12-23 00:12:11,978 INFO L226 Difference]: Without dead ends: 27 [2020-12-23 00:12:11,978 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:12:11,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-23 00:12:11,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 17. [2020-12-23 00:12:11,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 00:12:11,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-23 00:12:11,983 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-12-23 00:12:11,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:11,984 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-23 00:12:11,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 00:12:11,984 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-23 00:12:11,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 00:12:11,985 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:11,985 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:12,198 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:12,199 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:12,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:12,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1963781416, now seen corresponding path program 3 times [2020-12-23 00:12:12,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:12,202 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993673014] [2020-12-23 00:12:12,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:12,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:12,319 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:12,320 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993673014] [2020-12-23 00:12:12,320 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777002120] [2020-12-23 00:12:12,321 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:12,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-23 00:12:12,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:12,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:12:12,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:12,420 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:12,421 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:12,421 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 00:12:12,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381405047] [2020-12-23 00:12:12,422 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 00:12:12,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:12,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 00:12:12,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:12:12,423 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-12-23 00:12:12,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:12,463 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2020-12-23 00:12:12,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 00:12:12,464 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-12-23 00:12:12,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:12,465 INFO L225 Difference]: With dead ends: 39 [2020-12-23 00:12:12,465 INFO L226 Difference]: Without dead ends: 33 [2020-12-23 00:12:12,466 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:12:12,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-23 00:12:12,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 18. [2020-12-23 00:12:12,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-23 00:12:12,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-23 00:12:12,471 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-12-23 00:12:12,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:12,471 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-23 00:12:12,472 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 00:12:12,472 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-23 00:12:12,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 00:12:12,473 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:12,473 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:12,688 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:12,689 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:12,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:12,690 INFO L82 PathProgramCache]: Analyzing trace with hash -696235598, now seen corresponding path program 4 times [2020-12-23 00:12:12,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:12,691 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084762026] [2020-12-23 00:12:12,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:12,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:12,790 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:12,791 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084762026] [2020-12-23 00:12:12,791 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490289214] [2020-12-23 00:12:12,792 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:12,841 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:12:12,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:12,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 00:12:12,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:12,921 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:12:12,922 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:12,922 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 11 [2020-12-23 00:12:12,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136873256] [2020-12-23 00:12:12,923 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 00:12:12,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:12,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 00:12:12,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:12:12,925 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 11 states. [2020-12-23 00:12:12,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:12,992 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-12-23 00:12:12,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 00:12:12,992 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2020-12-23 00:12:12,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:12,994 INFO L225 Difference]: With dead ends: 54 [2020-12-23 00:12:12,994 INFO L226 Difference]: Without dead ends: 43 [2020-12-23 00:12:12,995 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:12:12,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-23 00:12:12,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 23. [2020-12-23 00:12:13,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 00:12:13,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-12-23 00:12:13,001 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2020-12-23 00:12:13,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:13,001 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-12-23 00:12:13,001 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 00:12:13,001 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-12-23 00:12:13,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-23 00:12:13,002 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:13,002 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:13,216 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 00:12:13,217 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:13,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:13,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1003861208, now seen corresponding path program 5 times [2020-12-23 00:12:13,219 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:13,219 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56485564] [2020-12-23 00:12:13,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:13,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:13,292 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 00:12:13,293 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56485564] [2020-12-23 00:12:13,293 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65159370] [2020-12-23 00:12:13,293 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:13,464 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-12-23 00:12:13,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:13,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 00:12:13,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:13,573 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:12:13,573 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:13,574 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 15 [2020-12-23 00:12:13,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129445697] [2020-12-23 00:12:13,574 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 00:12:13,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:13,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 00:12:13,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:12:13,576 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 15 states. [2020-12-23 00:12:13,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:13,655 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2020-12-23 00:12:13,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:12:13,655 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 21 [2020-12-23 00:12:13,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:13,656 INFO L225 Difference]: With dead ends: 65 [2020-12-23 00:12:13,656 INFO L226 Difference]: Without dead ends: 53 [2020-12-23 00:12:13,657 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:12:13,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-23 00:12:13,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 28. [2020-12-23 00:12:13,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-23 00:12:13,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-23 00:12:13,663 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2020-12-23 00:12:13,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:13,663 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-23 00:12:13,664 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 00:12:13,664 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-23 00:12:13,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-23 00:12:13,664 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:13,665 INFO L422 BasicCegarLoop]: trace histogram [12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:13,879 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:13,880 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:13,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:13,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1992579314, now seen corresponding path program 6 times [2020-12-23 00:12:13,882 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:13,883 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000785369] [2020-12-23 00:12:13,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:13,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:13,968 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:12:13,969 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000785369] [2020-12-23 00:12:13,969 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479657775] [2020-12-23 00:12:13,969 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:14,229 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 00:12:14,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:14,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 00:12:14,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:14,283 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:12:14,284 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:14,284 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 00:12:14,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605331517] [2020-12-23 00:12:14,285 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 00:12:14,285 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:14,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 00:12:14,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:12:14,286 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 9 states. [2020-12-23 00:12:14,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:14,349 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2020-12-23 00:12:14,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 00:12:14,350 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-12-23 00:12:14,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:14,351 INFO L225 Difference]: With dead ends: 65 [2020-12-23 00:12:14,351 INFO L226 Difference]: Without dead ends: 59 [2020-12-23 00:12:14,352 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:12:14,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-23 00:12:14,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 29. [2020-12-23 00:12:14,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-23 00:12:14,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-12-23 00:12:14,357 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 26 [2020-12-23 00:12:14,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:14,358 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-12-23 00:12:14,358 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 00:12:14,358 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-12-23 00:12:14,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-23 00:12:14,359 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:14,359 INFO L422 BasicCegarLoop]: trace histogram [12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:14,572 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:14,573 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:14,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:14,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1691862744, now seen corresponding path program 7 times [2020-12-23 00:12:14,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:14,576 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018407801] [2020-12-23 00:12:14,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:14,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:14,714 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:12:14,714 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018407801] [2020-12-23 00:12:14,715 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075175248] [2020-12-23 00:12:14,715 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:14,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:14,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 00:12:14,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:14,946 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-23 00:12:14,946 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:14,947 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 15] total 20 [2020-12-23 00:12:14,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866108805] [2020-12-23 00:12:14,947 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 00:12:14,948 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:14,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 00:12:14,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=191, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:12:14,949 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 20 states. [2020-12-23 00:12:15,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:15,064 INFO L93 Difference]: Finished difference Result 84 states and 93 transitions. [2020-12-23 00:12:15,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-23 00:12:15,065 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-12-23 00:12:15,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:15,066 INFO L225 Difference]: With dead ends: 84 [2020-12-23 00:12:15,066 INFO L226 Difference]: Without dead ends: 70 [2020-12-23 00:12:15,066 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=189, Invalid=191, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:12:15,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-12-23 00:12:15,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 35. [2020-12-23 00:12:15,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-23 00:12:15,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-12-23 00:12:15,072 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 27 [2020-12-23 00:12:15,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:15,073 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-12-23 00:12:15,073 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 00:12:15,073 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-12-23 00:12:15,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-23 00:12:15,074 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:15,074 INFO L422 BasicCegarLoop]: trace histogram [17, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:15,288 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-23 00:12:15,289 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:15,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:15,290 INFO L82 PathProgramCache]: Analyzing trace with hash 1846683927, now seen corresponding path program 8 times [2020-12-23 00:12:15,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:15,291 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932036674] [2020-12-23 00:12:15,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:15,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:15,398 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-23 00:12:15,398 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932036674] [2020-12-23 00:12:15,399 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161780562] [2020-12-23 00:12:15,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:15,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:12:15,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:15,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 00:12:15,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:15,667 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-23 00:12:15,668 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:15,668 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 20] total 24 [2020-12-23 00:12:15,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149709107] [2020-12-23 00:12:15,669 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 00:12:15,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:15,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 00:12:15,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=277, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:12:15,670 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 24 states. [2020-12-23 00:12:15,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:15,800 INFO L93 Difference]: Finished difference Result 95 states and 103 transitions. [2020-12-23 00:12:15,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-23 00:12:15,800 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 33 [2020-12-23 00:12:15,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:15,801 INFO L225 Difference]: With dead ends: 95 [2020-12-23 00:12:15,801 INFO L226 Difference]: Without dead ends: 80 [2020-12-23 00:12:15,802 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=275, Invalid=277, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:12:15,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-23 00:12:15,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 40. [2020-12-23 00:12:15,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-23 00:12:15,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-12-23 00:12:15,809 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2020-12-23 00:12:15,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:15,809 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-12-23 00:12:15,809 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 00:12:15,809 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-12-23 00:12:15,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-23 00:12:15,810 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:15,810 INFO L422 BasicCegarLoop]: trace histogram [21, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:16,023 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:16,024 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:16,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:16,026 INFO L82 PathProgramCache]: Analyzing trace with hash 1471581331, now seen corresponding path program 9 times [2020-12-23 00:12:16,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:16,027 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037373967] [2020-12-23 00:12:16,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:16,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:16,160 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-23 00:12:16,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037373967] [2020-12-23 00:12:16,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498352338] [2020-12-23 00:12:16,160 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:16,463 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-23 00:12:16,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:16,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 00:12:16,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:16,516 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-23 00:12:16,517 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:16,517 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 00:12:16,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202210421] [2020-12-23 00:12:16,518 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 00:12:16,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:16,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 00:12:16,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:12:16,519 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 12 states. [2020-12-23 00:12:16,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:16,597 INFO L93 Difference]: Finished difference Result 92 states and 95 transitions. [2020-12-23 00:12:16,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 00:12:16,598 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2020-12-23 00:12:16,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:16,599 INFO L225 Difference]: With dead ends: 92 [2020-12-23 00:12:16,599 INFO L226 Difference]: Without dead ends: 86 [2020-12-23 00:12:16,600 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:12:16,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-12-23 00:12:16,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 41. [2020-12-23 00:12:16,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-23 00:12:16,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-12-23 00:12:16,621 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 38 [2020-12-23 00:12:16,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:16,622 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-12-23 00:12:16,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 00:12:16,622 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-12-23 00:12:16,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-23 00:12:16,625 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:16,625 INFO L422 BasicCegarLoop]: trace histogram [21, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:16,825 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:16,827 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:16,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:16,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1574172841, now seen corresponding path program 10 times [2020-12-23 00:12:16,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:16,829 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814097964] [2020-12-23 00:12:16,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:16,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:17,009 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-23 00:12:17,009 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814097964] [2020-12-23 00:12:17,010 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499897693] [2020-12-23 00:12:17,010 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:12:17,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:12:17,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:12:17,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-23 00:12:17,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:12:17,343 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-23 00:12:17,343 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:12:17,343 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 24] total 29 [2020-12-23 00:12:17,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144792076] [2020-12-23 00:12:17,344 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-23 00:12:17,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:12:17,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-23 00:12:17,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=407, Unknown=0, NotChecked=0, Total=812 [2020-12-23 00:12:17,346 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 29 states. [2020-12-23 00:12:17,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:12:17,519 INFO L93 Difference]: Finished difference Result 114 states and 123 transitions. [2020-12-23 00:12:17,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-23 00:12:17,520 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 39 [2020-12-23 00:12:17,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:12:17,521 INFO L225 Difference]: With dead ends: 114 [2020-12-23 00:12:17,521 INFO L226 Difference]: Without dead ends: 97 [2020-12-23 00:12:17,522 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=405, Invalid=407, Unknown=0, NotChecked=0, Total=812 [2020-12-23 00:12:17,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-12-23 00:12:17,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 47. [2020-12-23 00:12:17,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-12-23 00:12:17,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2020-12-23 00:12:17,528 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 39 [2020-12-23 00:12:17,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:12:17,528 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2020-12-23 00:12:17,528 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-23 00:12:17,528 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2020-12-23 00:12:17,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-23 00:12:17,529 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:12:17,529 INFO L422 BasicCegarLoop]: trace histogram [26, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:12:17,744 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 00:12:17,745 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:12:17,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:12:17,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1584597240, now seen corresponding path program 11 times [2020-12-23 00:12:17,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:12:17,746 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092392909] [2020-12-23 00:12:17,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:12:17,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:12:17,887 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-12-23 00:12:17,887 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092392909] [2020-12-23 00:12:17,888 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958197885] [2020-12-23 00:12:17,888 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:03,605 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2020-12-23 00:13:03,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:03,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-23 00:13:03,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:03,958 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-23 00:13:03,959 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:03,959 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 29] total 34 [2020-12-23 00:13:03,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104477334] [2020-12-23 00:13:03,960 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-12-23 00:13:03,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:03,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-12-23 00:13:03,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=562, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 00:13:03,962 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 34 states. [2020-12-23 00:13:04,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:04,130 INFO L93 Difference]: Finished difference Result 126 states and 135 transitions. [2020-12-23 00:13:04,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-23 00:13:04,130 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 45 [2020-12-23 00:13:04,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:04,131 INFO L225 Difference]: With dead ends: 126 [2020-12-23 00:13:04,131 INFO L226 Difference]: Without dead ends: 108 [2020-12-23 00:13:04,132 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=560, Invalid=562, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 00:13:04,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-12-23 00:13:04,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 53. [2020-12-23 00:13:04,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-23 00:13:04,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2020-12-23 00:13:04,153 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 45 [2020-12-23 00:13:04,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:04,153 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2020-12-23 00:13:04,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-12-23 00:13:04,153 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2020-12-23 00:13:04,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-23 00:13:04,154 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:04,154 INFO L422 BasicCegarLoop]: trace histogram [31, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:04,367 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 00:13:04,368 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:04,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:04,369 INFO L82 PathProgramCache]: Analyzing trace with hash -111608905, now seen corresponding path program 12 times [2020-12-23 00:13:04,370 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:04,370 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744201340] [2020-12-23 00:13:04,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:04,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:04,551 INFO L134 CoverageAnalysis]: Checked inductivity of 562 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2020-12-23 00:13:04,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744201340] [2020-12-23 00:13:04,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702719899] [2020-12-23 00:13:04,552 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:09,039 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-23 00:13:09,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:09,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 00:13:09,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:09,134 INFO L134 CoverageAnalysis]: Checked inductivity of 562 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2020-12-23 00:13:09,135 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:09,135 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-23 00:13:09,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423083530] [2020-12-23 00:13:09,136 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 00:13:09,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:09,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 00:13:09,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:13:09,137 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 15 states. [2020-12-23 00:13:09,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:09,236 INFO L93 Difference]: Finished difference Result 120 states and 123 transitions. [2020-12-23 00:13:09,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:13:09,237 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 51 [2020-12-23 00:13:09,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:09,238 INFO L225 Difference]: With dead ends: 120 [2020-12-23 00:13:09,238 INFO L226 Difference]: Without dead ends: 114 [2020-12-23 00:13:09,238 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 51 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 00:13:09,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-12-23 00:13:09,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 54. [2020-12-23 00:13:09,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-23 00:13:09,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-12-23 00:13:09,244 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-12-23 00:13:09,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:09,244 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-12-23 00:13:09,244 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 00:13:09,244 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-12-23 00:13:09,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-23 00:13:09,245 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:09,245 INFO L422 BasicCegarLoop]: trace histogram [31, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:09,458 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 00:13:09,459 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:09,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:09,459 INFO L82 PathProgramCache]: Analyzing trace with hash 886537395, now seen corresponding path program 13 times [2020-12-23 00:13:09,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:09,459 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123194724] [2020-12-23 00:13:09,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:09,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:09,672 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2020-12-23 00:13:09,672 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123194724] [2020-12-23 00:13:09,673 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1085976233] [2020-12-23 00:13:09,673 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:09,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:09,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 33 conjunts are in the unsatisfiable core [2020-12-23 00:13:09,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:10,137 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-23 00:13:10,138 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:10,138 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 34] total 40 [2020-12-23 00:13:10,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844407401] [2020-12-23 00:13:10,139 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-23 00:13:10,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:10,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-23 00:13:10,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=779, Invalid=781, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 00:13:10,141 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 40 states. [2020-12-23 00:13:10,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:10,351 INFO L93 Difference]: Finished difference Result 146 states and 156 transitions. [2020-12-23 00:13:10,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-23 00:13:10,351 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 52 [2020-12-23 00:13:10,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:10,352 INFO L225 Difference]: With dead ends: 146 [2020-12-23 00:13:10,352 INFO L226 Difference]: Without dead ends: 126 [2020-12-23 00:13:10,354 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 939 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=779, Invalid=781, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 00:13:10,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-12-23 00:13:10,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 61. [2020-12-23 00:13:10,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-12-23 00:13:10,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2020-12-23 00:13:10,359 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 52 [2020-12-23 00:13:10,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:10,359 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2020-12-23 00:13:10,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-23 00:13:10,359 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2020-12-23 00:13:10,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-12-23 00:13:10,360 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:10,360 INFO L422 BasicCegarLoop]: trace histogram [37, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:10,574 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:10,575 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:10,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:10,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1383157417, now seen corresponding path program 14 times [2020-12-23 00:13:10,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:10,577 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556877821] [2020-12-23 00:13:10,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:10,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:10,762 INFO L134 CoverageAnalysis]: Checked inductivity of 794 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-12-23 00:13:10,763 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556877821] [2020-12-23 00:13:10,763 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190534941] [2020-12-23 00:13:10,763 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:10,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:13:10,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:10,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 39 conjunts are in the unsatisfiable core [2020-12-23 00:13:10,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:11,269 INFO L134 CoverageAnalysis]: Checked inductivity of 794 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-23 00:13:11,270 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:11,270 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 40] total 45 [2020-12-23 00:13:11,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704495515] [2020-12-23 00:13:11,272 INFO L461 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-12-23 00:13:11,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:11,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-12-23 00:13:11,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=989, Invalid=991, Unknown=0, NotChecked=0, Total=1980 [2020-12-23 00:13:11,275 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand 45 states. [2020-12-23 00:13:11,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:11,505 INFO L93 Difference]: Finished difference Result 158 states and 167 transitions. [2020-12-23 00:13:11,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-12-23 00:13:11,505 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 59 [2020-12-23 00:13:11,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:11,506 INFO L225 Difference]: With dead ends: 158 [2020-12-23 00:13:11,506 INFO L226 Difference]: Without dead ends: 137 [2020-12-23 00:13:11,508 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=989, Invalid=991, Unknown=0, NotChecked=0, Total=1980 [2020-12-23 00:13:11,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2020-12-23 00:13:11,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 67. [2020-12-23 00:13:11,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-12-23 00:13:11,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2020-12-23 00:13:11,523 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 59 [2020-12-23 00:13:11,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:11,524 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2020-12-23 00:13:11,524 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-12-23 00:13:11,524 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2020-12-23 00:13:11,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-23 00:13:11,529 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:11,529 INFO L422 BasicCegarLoop]: trace histogram [42, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:11,742 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 00:13:11,743 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:11,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:11,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1699330680, now seen corresponding path program 15 times [2020-12-23 00:13:11,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:11,745 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [581975917] [2020-12-23 00:13:11,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:11,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:11,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2020-12-23 00:13:11,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [581975917] [2020-12-23 00:13:11,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492837910] [2020-12-23 00:13:11,992 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:14,197 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2020-12-23 00:13:14,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:14,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 00:13:14,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:14,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2020-12-23 00:13:14,300 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:14,300 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 00:13:14,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580383980] [2020-12-23 00:13:14,301 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 00:13:14,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:14,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 00:13:14,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:13:14,306 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand 18 states. [2020-12-23 00:13:14,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:14,453 INFO L93 Difference]: Finished difference Result 149 states and 152 transitions. [2020-12-23 00:13:14,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 00:13:14,454 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 65 [2020-12-23 00:13:14,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:14,454 INFO L225 Difference]: With dead ends: 149 [2020-12-23 00:13:14,455 INFO L226 Difference]: Without dead ends: 143 [2020-12-23 00:13:14,455 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:13:14,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2020-12-23 00:13:14,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 68. [2020-12-23 00:13:14,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-23 00:13:14,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-23 00:13:14,461 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-12-23 00:13:14,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:14,461 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-23 00:13:14,461 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 00:13:14,461 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-23 00:13:14,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-23 00:13:14,462 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:14,462 INFO L422 BasicCegarLoop]: trace histogram [42, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:14,676 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 00:13:14,677 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:14,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:14,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1191089682, now seen corresponding path program 16 times [2020-12-23 00:13:14,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:14,679 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964050387] [2020-12-23 00:13:14,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:14,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:14,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2020-12-23 00:13:14,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964050387] [2020-12-23 00:13:14,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18814237] [2020-12-23 00:13:14,905 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:13:15,004 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:13:15,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:13:15,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 44 conjunts are in the unsatisfiable core [2020-12-23 00:13:15,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:13:15,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-23 00:13:15,464 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:13:15,465 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 45] total 51 [2020-12-23 00:13:15,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585069408] [2020-12-23 00:13:15,465 INFO L461 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-12-23 00:13:15,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:13:15,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-12-23 00:13:15,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1274, Invalid=1276, Unknown=0, NotChecked=0, Total=2550 [2020-12-23 00:13:15,467 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 51 states. [2020-12-23 00:13:15,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:13:15,756 INFO L93 Difference]: Finished difference Result 178 states and 188 transitions. [2020-12-23 00:13:15,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-12-23 00:13:15,757 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 66 [2020-12-23 00:13:15,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:13:15,758 INFO L225 Difference]: With dead ends: 178 [2020-12-23 00:13:15,758 INFO L226 Difference]: Without dead ends: 155 [2020-12-23 00:13:15,759 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1617 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=1274, Invalid=1276, Unknown=0, NotChecked=0, Total=2550 [2020-12-23 00:13:15,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-12-23 00:13:15,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 75. [2020-12-23 00:13:15,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-12-23 00:13:15,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2020-12-23 00:13:15,764 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 66 [2020-12-23 00:13:15,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:13:15,764 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2020-12-23 00:13:15,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-12-23 00:13:15,764 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2020-12-23 00:13:15,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-23 00:13:15,765 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:13:15,765 INFO L422 BasicCegarLoop]: trace histogram [48, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:13:15,980 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 00:13:15,981 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:13:15,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:13:15,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1757836328, now seen corresponding path program 17 times [2020-12-23 00:13:15,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:13:15,982 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579436827] [2020-12-23 00:13:15,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:13:16,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:13:16,224 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2020-12-23 00:13:16,225 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579436827] [2020-12-23 00:13:16,225 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134554595] [2020-12-23 00:13:16,225 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true