/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/reducercommutativity/sep.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 00:25:47,554 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 00:25:47,558 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 00:25:47,611 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 00:25:47,612 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 00:25:47,618 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 00:25:47,622 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 00:25:47,628 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 00:25:47,632 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 00:25:47,639 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 00:25:47,644 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 00:25:47,645 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 00:25:47,645 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 00:25:47,649 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 00:25:47,651 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 00:25:47,652 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 00:25:47,664 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 00:25:47,668 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 00:25:47,676 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 00:25:47,685 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 00:25:47,687 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 00:25:47,690 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 00:25:47,692 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 00:25:47,695 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 00:25:47,704 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 00:25:47,723 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 00:25:47,724 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 00:25:47,726 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 00:25:47,727 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 00:25:47,779 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 00:25:47,779 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 00:25:47,783 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 00:25:47,783 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 00:25:47,784 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 00:25:47,784 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 00:25:47,784 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 00:25:47,784 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 00:25:47,784 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 00:25:47,785 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 00:25:47,786 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 00:25:47,786 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 00:25:47,786 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 00:25:47,787 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 00:25:47,787 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 00:25:47,787 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 00:25:47,787 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 00:25:47,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 00:25:47,788 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 00:25:47,788 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 00:25:47,788 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 00:25:47,788 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 00:25:47,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 00:25:47,788 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 00:25:47,789 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 00:25:47,789 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 00:25:48,234 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 00:25:48,279 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 00:25:48,282 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 00:25:48,284 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 00:25:48,284 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 00:25:48,288 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/reducercommutativity/sep.i [2020-12-23 00:25:48,387 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9682e7450/bb42165cb08e4d448d57320ff3d6a700/FLAG4d4ddb464 [2020-12-23 00:25:48,981 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 00:25:48,982 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/reducercommutativity/sep.i [2020-12-23 00:25:48,990 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9682e7450/bb42165cb08e4d448d57320ff3d6a700/FLAG4d4ddb464 [2020-12-23 00:25:49,387 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9682e7450/bb42165cb08e4d448d57320ff3d6a700 [2020-12-23 00:25:49,390 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 00:25:49,393 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 00:25:49,397 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 00:25:49,397 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 00:25:49,401 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 00:25:49,403 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,404 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f85f56c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49, skipping insertion in model container [2020-12-23 00:25:49,404 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,412 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 00:25:49,431 INFO L178 MainTranslator]: Built tables and reachable declarations left hand side expression in assignment: lhs: VariableLHS[~N~0,GLOBAL] left hand side expression in assignment: lhs: VariableLHS[~ret~1,] left hand side expression in assignment: lhs: VariableLHS[~temp~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~x~0,],[IntegerLiteral[0]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~x~0,],[IntegerLiteral[1]]] left hand side expression in assignment: lhs: VariableLHS[~ret2~0,] left hand side expression in assignment: lhs: VariableLHS[~temp~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~x~0,],[IdentifierExpression[~i~1,]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~x~0,],[BinaryExpression[ARITHMINUS,IdentifierExpression[~N~0,GLOBAL],IntegerLiteral[1]]]] left hand side expression in assignment: lhs: VariableLHS[~ret5~0,] [2020-12-23 00:25:49,648 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/reducercommutativity/sep.i[1298,1311] [2020-12-23 00:25:49,651 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:25:49,660 INFO L203 MainTranslator]: Completed pre-run left hand side expression in assignment: lhs: VariableLHS[~N~0,GLOBAL] left hand side expression in assignment: lhs: VariableLHS[~ret~1,] left hand side expression in assignment: lhs: VariableLHS[~temp~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#x~0,],base],StructAccessExpression[IdentifierExpression[~#x~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#x~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[4],StructAccessExpression[IdentifierExpression[~#x~0,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~ret2~0,] left hand side expression in assignment: lhs: VariableLHS[~temp~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#x~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#x~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~1,]]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#x~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#x~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],BinaryExpression[ARITHMINUS,IdentifierExpression[~N~0,GLOBAL],IntegerLiteral[1]]]]]] left hand side expression in assignment: lhs: VariableLHS[~ret5~0,] [2020-12-23 00:25:49,694 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/reducercommutativity/sep.i[1298,1311] [2020-12-23 00:25:49,696 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:25:49,719 INFO L208 MainTranslator]: Completed translation [2020-12-23 00:25:49,719 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49 WrapperNode [2020-12-23 00:25:49,719 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 00:25:49,722 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 00:25:49,722 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 00:25:49,722 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 00:25:49,731 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,752 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,796 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 00:25:49,799 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 00:25:49,799 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 00:25:49,800 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 00:25:49,812 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,813 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,823 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,823 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,850 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,859 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,862 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (1/1) ... [2020-12-23 00:25:49,870 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 00:25:49,871 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 00:25:49,871 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 00:25:49,872 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 00:25:49,873 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (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 00:25:49,987 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 00:25:49,988 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 00:25:49,988 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 00:25:49,988 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 00:25:49,988 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 00:25:49,989 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 00:25:49,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 00:25:50,521 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 00:25:50,521 INFO L299 CfgBuilder]: Removed 14 assume(true) statements. [2020-12-23 00:25:50,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:25:50 BoogieIcfgContainer [2020-12-23 00:25:50,523 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 00:25:50,524 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 00:25:50,525 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 00:25:50,528 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 00:25:50,528 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 12:25:49" (1/3) ... [2020-12-23 00:25:50,529 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26c17b5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:25:50, skipping insertion in model container [2020-12-23 00:25:50,529 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:25:49" (2/3) ... [2020-12-23 00:25:50,530 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26c17b5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:25:50, skipping insertion in model container [2020-12-23 00:25:50,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:25:50" (3/3) ... [2020-12-23 00:25:50,532 INFO L111 eAbstractionObserver]: Analyzing ICFG sep.i [2020-12-23 00:25:50,539 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 00:25:50,544 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 00:25:50,562 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 00:25:50,587 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 00:25:50,587 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 00:25:50,587 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 00:25:50,587 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 00:25:50,588 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 00:25:50,588 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 00:25:50,588 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 00:25:50,588 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 00:25:50,602 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-12-23 00:25:50,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 00:25:50,607 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:25:50,608 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:25:50,608 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:25:50,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:25:50,615 INFO L82 PathProgramCache]: Analyzing trace with hash -805411982, now seen corresponding path program 1 times [2020-12-23 00:25:50,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:25:50,626 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880972963] [2020-12-23 00:25:50,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:25:50,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:50,802 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 00:25:50,803 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880972963] [2020-12-23 00:25:50,803 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:25:50,804 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-23 00:25:50,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750744068] [2020-12-23 00:25:50,810 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-23 00:25:50,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:25:50,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-23 00:25:50,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-23 00:25:50,828 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2020-12-23 00:25:50,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:25:50,848 INFO L93 Difference]: Finished difference Result 52 states and 72 transitions. [2020-12-23 00:25:50,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-23 00:25:50,850 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2020-12-23 00:25:50,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:25:50,860 INFO L225 Difference]: With dead ends: 52 [2020-12-23 00:25:50,860 INFO L226 Difference]: Without dead ends: 24 [2020-12-23 00:25:50,863 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-23 00:25:50,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-23 00:25:50,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-12-23 00:25:50,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-23 00:25:50,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2020-12-23 00:25:50,901 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 16 [2020-12-23 00:25:50,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:25:50,902 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2020-12-23 00:25:50,902 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-23 00:25:50,902 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2020-12-23 00:25:50,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 00:25:50,903 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:25:50,903 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:25:50,904 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 00:25:50,904 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:25:50,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:25:50,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1872946201, now seen corresponding path program 1 times [2020-12-23 00:25:50,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:25:50,906 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913666709] [2020-12-23 00:25:50,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:25:50,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:50,994 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 00:25:50,995 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913666709] [2020-12-23 00:25:50,995 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:25:50,995 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 00:25:50,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361743560] [2020-12-23 00:25:50,997 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:25:50,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:25:50,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:25:50,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:25:50,999 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand 3 states. [2020-12-23 00:25:51,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:25:51,066 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2020-12-23 00:25:51,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:25:51,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-12-23 00:25:51,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:25:51,068 INFO L225 Difference]: With dead ends: 45 [2020-12-23 00:25:51,068 INFO L226 Difference]: Without dead ends: 27 [2020-12-23 00:25:51,069 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 00:25:51,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-23 00:25:51,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2020-12-23 00:25:51,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-23 00:25:51,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-12-23 00:25:51,076 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 16 [2020-12-23 00:25:51,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:25:51,076 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-12-23 00:25:51,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:25:51,077 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-12-23 00:25:51,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-23 00:25:51,078 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:25:51,078 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:25:51,078 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-23 00:25:51,078 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:25:51,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:25:51,081 INFO L82 PathProgramCache]: Analyzing trace with hash -567209286, now seen corresponding path program 1 times [2020-12-23 00:25:51,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:25:51,082 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356702769] [2020-12-23 00:25:51,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:25:51,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:51,261 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 00:25:51,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356702769] [2020-12-23 00:25:51,263 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:25:51,263 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 00:25:51,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227005688] [2020-12-23 00:25:51,265 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 00:25:51,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:25:51,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 00:25:51,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 00:25:51,272 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 4 states. [2020-12-23 00:25:51,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:25:51,367 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2020-12-23 00:25:51,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 00:25:51,368 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2020-12-23 00:25:51,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:25:51,369 INFO L225 Difference]: With dead ends: 46 [2020-12-23 00:25:51,369 INFO L226 Difference]: Without dead ends: 33 [2020-12-23 00:25:51,370 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 00:25:51,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-23 00:25:51,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2020-12-23 00:25:51,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-23 00:25:51,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2020-12-23 00:25:51,377 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 19 [2020-12-23 00:25:51,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:25:51,377 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2020-12-23 00:25:51,377 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 00:25:51,378 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2020-12-23 00:25:51,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-23 00:25:51,378 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:25:51,379 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:25:51,379 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-23 00:25:51,379 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:25:51,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:25:51,380 INFO L82 PathProgramCache]: Analyzing trace with hash -2050984225, now seen corresponding path program 1 times [2020-12-23 00:25:51,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:25:51,381 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075175248] [2020-12-23 00:25:51,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:25:51,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:51,508 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-23 00:25:51,509 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075175248] [2020-12-23 00:25:51,509 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:25:51,509 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 00:25:51,510 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807355461] [2020-12-23 00:25:51,510 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 00:25:51,511 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:25:51,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 00:25:51,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 00:25:51,512 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand 4 states. [2020-12-23 00:25:51,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:25:51,585 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-12-23 00:25:51,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 00:25:51,586 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2020-12-23 00:25:51,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:25:51,587 INFO L225 Difference]: With dead ends: 39 [2020-12-23 00:25:51,587 INFO L226 Difference]: Without dead ends: 29 [2020-12-23 00:25:51,588 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 00:25:51,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-23 00:25:51,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-12-23 00:25:51,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-23 00:25:51,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-12-23 00:25:51,595 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 25 [2020-12-23 00:25:51,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:25:51,595 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-12-23 00:25:51,596 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 00:25:51,596 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-12-23 00:25:51,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-23 00:25:51,597 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:25:51,597 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:25:51,597 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-23 00:25:51,598 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:25:51,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:25:51,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1500824769, now seen corresponding path program 1 times [2020-12-23 00:25:51,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:25:51,599 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896935905] [2020-12-23 00:25:51,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:25:51,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:51,739 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 00:25:51,740 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896935905] [2020-12-23 00:25:51,741 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616158604] [2020-12-23 00:25:51,741 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 00:25:51,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:51,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:25:51,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:25:52,041 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 00:25:52,042 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:25:52,042 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-12-23 00:25:52,043 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146414555] [2020-12-23 00:25:52,043 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 00:25:52,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:25:52,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 00:25:52,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:25:52,045 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 6 states. [2020-12-23 00:25:52,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:25:52,135 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-12-23 00:25:52,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 00:25:52,136 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-12-23 00:25:52,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:25:52,137 INFO L225 Difference]: With dead ends: 54 [2020-12-23 00:25:52,137 INFO L226 Difference]: Without dead ends: 33 [2020-12-23 00:25:52,138 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:25:52,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-23 00:25:52,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-12-23 00:25:52,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-23 00:25:52,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-12-23 00:25:52,145 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-12-23 00:25:52,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:25:52,145 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-12-23 00:25:52,145 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 00:25:52,146 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-12-23 00:25:52,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-23 00:25:52,147 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:25:52,147 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:25:52,361 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:25:52,362 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:25:52,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:25:52,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1175870478, now seen corresponding path program 2 times [2020-12-23 00:25:52,364 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:25:52,365 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408711442] [2020-12-23 00:25:52,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:25:52,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:52,513 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-23 00:25:52,514 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408711442] [2020-12-23 00:25:52,516 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608151966] [2020-12-23 00:25:52,516 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:25:52,655 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:25:52,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:25:52,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:25:52,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:25:52,784 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-23 00:25:52,784 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:25:52,784 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2020-12-23 00:25:52,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799105164] [2020-12-23 00:25:52,785 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 00:25:52,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:25:52,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 00:25:52,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:25:52,787 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 7 states. [2020-12-23 00:25:52,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:25:52,975 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-12-23 00:25:52,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 00:25:52,976 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2020-12-23 00:25:52,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:25:52,977 INFO L225 Difference]: With dead ends: 58 [2020-12-23 00:25:52,977 INFO L226 Difference]: Without dead ends: 43 [2020-12-23 00:25:52,978 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2020-12-23 00:25:52,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-23 00:25:52,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 37. [2020-12-23 00:25:52,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-23 00:25:52,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-12-23 00:25:52,986 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 30 [2020-12-23 00:25:52,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:25:52,986 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-12-23 00:25:52,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 00:25:52,986 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-12-23 00:25:52,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:25:52,988 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:25:52,988 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:25:53,202 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:25:53,203 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:25:53,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:25:53,205 INFO L82 PathProgramCache]: Analyzing trace with hash 657704709, now seen corresponding path program 3 times [2020-12-23 00:25:53,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:25:53,206 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457466763] [2020-12-23 00:25:53,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:25:53,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:54,044 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:25:54,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457466763] [2020-12-23 00:25:54,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686570971] [2020-12-23 00:25:54,046 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:25:54,177 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-23 00:25:54,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:25:54,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-23 00:25:54,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:25:54,562 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:25:54,563 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:25:54,563 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 21 [2020-12-23 00:25:54,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132922748] [2020-12-23 00:25:54,565 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 00:25:54,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:25:54,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 00:25:54,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:25:54,571 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 21 states. [2020-12-23 00:25:55,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:25:55,085 INFO L93 Difference]: Finished difference Result 206 states and 252 transitions. [2020-12-23 00:25:55,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 00:25:55,086 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 36 [2020-12-23 00:25:55,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:25:55,090 INFO L225 Difference]: With dead ends: 206 [2020-12-23 00:25:55,090 INFO L226 Difference]: Without dead ends: 201 [2020-12-23 00:25:55,091 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=112, Invalid=488, Unknown=0, NotChecked=0, Total=600 [2020-12-23 00:25:55,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-12-23 00:25:55,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 82. [2020-12-23 00:25:55,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-12-23 00:25:55,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 111 transitions. [2020-12-23 00:25:55,109 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 111 transitions. Word has length 36 [2020-12-23 00:25:55,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:25:55,110 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 111 transitions. [2020-12-23 00:25:55,110 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 00:25:55,110 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 111 transitions. [2020-12-23 00:25:55,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:25:55,111 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:25:55,112 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:25:55,325 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:25:55,326 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:25:55,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:25:55,327 INFO L82 PathProgramCache]: Analyzing trace with hash -1862255225, now seen corresponding path program 1 times [2020-12-23 00:25:55,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:25:55,328 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646039505] [2020-12-23 00:25:55,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:25:55,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:56,114 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:25:56,121 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646039505] [2020-12-23 00:25:56,122 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866114203] [2020-12-23 00:25:56,122 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 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 00:25:56,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:25:56,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 39 conjunts are in the unsatisfiable core [2020-12-23 00:25:56,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:25:56,589 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2020-12-23 00:25:56,592 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:25:56,601 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:25:56,603 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:25:56,603 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:12 [2020-12-23 00:25:56,672 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2020-12-23 00:25:56,673 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:25:56,682 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:25:56,686 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2020-12-23 00:25:56,687 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:28, output treesize:24 [2020-12-23 00:25:56,868 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:25:56,869 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 24 [2020-12-23 00:25:56,871 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-23 00:25:56,884 INFO L625 ElimStorePlain]: treesize reduction 7, result has 63.2 percent of original size [2020-12-23 00:25:56,889 INFO L547 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:25:56,889 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:30, output treesize:5 [2020-12-23 00:25:56,937 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-23 00:25:56,938 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:25:56,938 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2020-12-23 00:25:56,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112341927] [2020-12-23 00:25:56,939 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 00:25:56,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:25:56,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 00:25:56,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=474, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:25:56,940 INFO L87 Difference]: Start difference. First operand 82 states and 111 transitions. Second operand 24 states. [2020-12-23 00:26:00,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:00,571 INFO L93 Difference]: Finished difference Result 317 states and 419 transitions. [2020-12-23 00:26:00,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-12-23 00:26:00,572 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 36 [2020-12-23 00:26:00,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:00,574 INFO L225 Difference]: With dead ends: 317 [2020-12-23 00:26:00,574 INFO L226 Difference]: Without dead ends: 285 [2020-12-23 00:26:00,577 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1114 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=866, Invalid=3690, Unknown=0, NotChecked=0, Total=4556 [2020-12-23 00:26:00,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-12-23 00:26:00,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 174. [2020-12-23 00:26:00,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-12-23 00:26:00,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 234 transitions. [2020-12-23 00:26:00,607 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 234 transitions. Word has length 36 [2020-12-23 00:26:00,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:00,608 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 234 transitions. [2020-12-23 00:26:00,608 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 00:26:00,608 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 234 transitions. [2020-12-23 00:26:00,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:26:00,610 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:00,610 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:00,824 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:26:00,825 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:00,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:00,826 INFO L82 PathProgramCache]: Analyzing trace with hash -159943741, now seen corresponding path program 1 times [2020-12-23 00:26:00,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:00,827 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419207095] [2020-12-23 00:26:00,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:00,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:01,218 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:26:01,219 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419207095] [2020-12-23 00:26:01,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146356924] [2020-12-23 00:26:01,220 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 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 00:26:01,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:01,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 36 conjunts are in the unsatisfiable core [2020-12-23 00:26:01,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:01,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:26:01,511 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 23 [2020-12-23 00:26:01,514 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:01,525 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:01,526 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:01,526 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2020-12-23 00:26:01,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:26:01,624 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:01,624 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 37 treesize of output 59 [2020-12-23 00:26:01,627 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:01,661 INFO L625 ElimStorePlain]: treesize reduction 14, result has 77.4 percent of original size [2020-12-23 00:26:01,663 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:26:01,666 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:01,667 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:17 [2020-12-23 00:26:01,700 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2020-12-23 00:26:01,701 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:01,703 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:01,703 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:01,704 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:18, output treesize:6 [2020-12-23 00:26:01,740 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-23 00:26:01,740 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:01,740 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2020-12-23 00:26:01,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204387268] [2020-12-23 00:26:01,741 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 00:26:01,741 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:01,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 00:26:01,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:26:01,742 INFO L87 Difference]: Start difference. First operand 174 states and 234 transitions. Second operand 19 states. [2020-12-23 00:26:03,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:03,694 INFO L93 Difference]: Finished difference Result 380 states and 505 transitions. [2020-12-23 00:26:03,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-12-23 00:26:03,696 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2020-12-23 00:26:03,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:03,698 INFO L225 Difference]: With dead ends: 380 [2020-12-23 00:26:03,699 INFO L226 Difference]: Without dead ends: 291 [2020-12-23 00:26:03,700 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=237, Invalid=1403, Unknown=0, NotChecked=0, Total=1640 [2020-12-23 00:26:03,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2020-12-23 00:26:03,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 189. [2020-12-23 00:26:03,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2020-12-23 00:26:03,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 249 transitions. [2020-12-23 00:26:03,732 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 249 transitions. Word has length 36 [2020-12-23 00:26:03,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:03,732 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 249 transitions. [2020-12-23 00:26:03,732 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 00:26:03,732 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 249 transitions. [2020-12-23 00:26:03,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:26:03,735 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:03,735 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:03,949 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:26:03,950 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:03,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:03,951 INFO L82 PathProgramCache]: Analyzing trace with hash 238469769, now seen corresponding path program 1 times [2020-12-23 00:26:03,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:03,952 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676842073] [2020-12-23 00:26:03,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:04,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:04,519 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:26:04,519 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676842073] [2020-12-23 00:26:04,519 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899389715] [2020-12-23 00:26:04,520 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 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 00:26:04,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:04,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 39 conjunts are in the unsatisfiable core [2020-12-23 00:26:04,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:04,958 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2020-12-23 00:26:04,960 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:04,966 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:04,967 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:04,967 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:13 [2020-12-23 00:26:05,048 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2020-12-23 00:26:05,049 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:05,064 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:05,071 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2020-12-23 00:26:05,072 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:40, output treesize:57 [2020-12-23 00:26:07,275 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:07,276 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 37 [2020-12-23 00:26:07,279 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:26:07,282 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-23 00:26:07,317 INFO L625 ElimStorePlain]: treesize reduction 8, result has 75.8 percent of original size [2020-12-23 00:26:07,322 INFO L547 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2020-12-23 00:26:07,322 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:61, output treesize:50 [2020-12-23 00:26:07,405 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-23 00:26:07,407 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:07,407 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2020-12-23 00:26:07,408 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125631798] [2020-12-23 00:26:07,408 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 00:26:07,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:07,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 00:26:07,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=475, Unknown=1, NotChecked=0, Total=552 [2020-12-23 00:26:07,413 INFO L87 Difference]: Start difference. First operand 189 states and 249 transitions. Second operand 24 states. [2020-12-23 00:26:10,666 WARN L197 SmtUtils]: Spent 2.07 s on a formula simplification. DAG size of input: 61 DAG size of output: 44 [2020-12-23 00:26:12,113 WARN L197 SmtUtils]: Spent 778.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 40 [2020-12-23 00:26:14,259 WARN L197 SmtUtils]: Spent 2.10 s on a formula simplification. DAG size of input: 74 DAG size of output: 46 [2020-12-23 00:26:16,417 WARN L197 SmtUtils]: Spent 2.08 s on a formula simplification. DAG size of input: 62 DAG size of output: 46 [2020-12-23 00:26:18,561 WARN L197 SmtUtils]: Spent 2.10 s on a formula simplification. DAG size of input: 80 DAG size of output: 51 [2020-12-23 00:26:20,852 WARN L197 SmtUtils]: Spent 2.07 s on a formula simplification. DAG size of input: 61 DAG size of output: 43 [2020-12-23 00:26:22,309 WARN L197 SmtUtils]: Spent 1.41 s on a formula simplification. DAG size of input: 66 DAG size of output: 49 [2020-12-23 00:26:23,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:23,066 INFO L93 Difference]: Finished difference Result 307 states and 395 transitions. [2020-12-23 00:26:23,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-12-23 00:26:23,066 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 36 [2020-12-23 00:26:23,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:23,068 INFO L225 Difference]: With dead ends: 307 [2020-12-23 00:26:23,069 INFO L226 Difference]: Without dead ends: 297 [2020-12-23 00:26:23,071 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=656, Invalid=2535, Unknown=1, NotChecked=0, Total=3192 [2020-12-23 00:26:23,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-12-23 00:26:23,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 232. [2020-12-23 00:26:23,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-12-23 00:26:23,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 302 transitions. [2020-12-23 00:26:23,115 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 302 transitions. Word has length 36 [2020-12-23 00:26:23,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:23,116 INFO L481 AbstractCegarLoop]: Abstraction has 232 states and 302 transitions. [2020-12-23 00:26:23,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 00:26:23,116 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 302 transitions. [2020-12-23 00:26:23,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:26:23,124 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:23,124 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:23,328 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:26:23,329 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:23,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:23,330 INFO L82 PathProgramCache]: Analyzing trace with hash 2013477131, now seen corresponding path program 1 times [2020-12-23 00:26:23,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:23,330 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691409031] [2020-12-23 00:26:23,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:23,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:23,698 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-23 00:26:23,699 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691409031] [2020-12-23 00:26:23,699 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708456104] [2020-12-23 00:26:23,699 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 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 00:26:23,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:23,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-23 00:26:23,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:23,954 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 00:26:23,955 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:23,955 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 16 [2020-12-23 00:26:23,955 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967967150] [2020-12-23 00:26:23,956 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 00:26:23,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:23,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 00:26:23,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:26:23,957 INFO L87 Difference]: Start difference. First operand 232 states and 302 transitions. Second operand 16 states. [2020-12-23 00:26:24,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:24,467 INFO L93 Difference]: Finished difference Result 468 states and 597 transitions. [2020-12-23 00:26:24,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 00:26:24,468 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-12-23 00:26:24,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:24,471 INFO L225 Difference]: With dead ends: 468 [2020-12-23 00:26:24,472 INFO L226 Difference]: Without dead ends: 463 [2020-12-23 00:26:24,473 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 30 SyntacticMatches, 7 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:26:24,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2020-12-23 00:26:24,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 289. [2020-12-23 00:26:24,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2020-12-23 00:26:24,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 380 transitions. [2020-12-23 00:26:24,515 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 380 transitions. Word has length 36 [2020-12-23 00:26:24,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:24,515 INFO L481 AbstractCegarLoop]: Abstraction has 289 states and 380 transitions. [2020-12-23 00:26:24,515 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 00:26:24,515 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 380 transitions. [2020-12-23 00:26:24,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:26:24,518 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:24,518 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:24,732 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:26:24,732 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:24,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:24,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1620450121, now seen corresponding path program 1 times [2020-12-23 00:26:24,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:24,734 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089401362] [2020-12-23 00:26:24,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:24,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:25,940 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-23 00:26:25,941 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089401362] [2020-12-23 00:26:25,941 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60883019] [2020-12-23 00:26:25,941 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 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 00:26:26,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:26,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 36 conjunts are in the unsatisfiable core [2020-12-23 00:26:26,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:26,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:26:26,308 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 22 [2020-12-23 00:26:26,309 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:26,321 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:26,322 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:26,322 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:35, output treesize:29 [2020-12-23 00:26:26,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:26:26,404 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:26,405 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 58 [2020-12-23 00:26:26,407 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:26,448 INFO L625 ElimStorePlain]: treesize reduction 14, result has 77.0 percent of original size [2020-12-23 00:26:26,451 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:26:26,453 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:26,453 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:45, output treesize:16 [2020-12-23 00:26:26,486 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2020-12-23 00:26:26,487 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:26,490 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:26,491 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:26,491 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:23, output treesize:7 [2020-12-23 00:26:26,538 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-23 00:26:26,539 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:26,539 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11] total 25 [2020-12-23 00:26:26,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912042612] [2020-12-23 00:26:26,539 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-23 00:26:26,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:26,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-23 00:26:26,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2020-12-23 00:26:26,541 INFO L87 Difference]: Start difference. First operand 289 states and 380 transitions. Second operand 25 states. [2020-12-23 00:26:27,882 WARN L197 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 33 [2020-12-23 00:26:30,365 WARN L197 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 27 [2020-12-23 00:26:30,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:30,990 INFO L93 Difference]: Finished difference Result 684 states and 902 transitions. [2020-12-23 00:26:30,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-12-23 00:26:30,991 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 36 [2020-12-23 00:26:30,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:30,994 INFO L225 Difference]: With dead ends: 684 [2020-12-23 00:26:30,995 INFO L226 Difference]: Without dead ends: 632 [2020-12-23 00:26:30,997 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1143 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=693, Invalid=3467, Unknown=0, NotChecked=0, Total=4160 [2020-12-23 00:26:30,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2020-12-23 00:26:31,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 345. [2020-12-23 00:26:31,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 345 states. [2020-12-23 00:26:31,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 448 transitions. [2020-12-23 00:26:31,044 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 448 transitions. Word has length 36 [2020-12-23 00:26:31,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:31,044 INFO L481 AbstractCegarLoop]: Abstraction has 345 states and 448 transitions. [2020-12-23 00:26:31,045 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-23 00:26:31,045 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 448 transitions. [2020-12-23 00:26:31,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:26:31,046 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:31,046 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:31,259 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 00:26:31,260 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:31,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:31,261 INFO L82 PathProgramCache]: Analyzing trace with hash 932464323, now seen corresponding path program 1 times [2020-12-23 00:26:31,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:31,262 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971095436] [2020-12-23 00:26:31,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:31,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:31,948 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:26:31,948 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971095436] [2020-12-23 00:26:31,949 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885825247] [2020-12-23 00:26:31,949 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 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 00:26:32,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:32,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 34 conjunts are in the unsatisfiable core [2020-12-23 00:26:32,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:32,202 INFO L348 Elim1Store]: treesize reduction 31, result has 18.4 percent of original size [2020-12-23 00:26:32,202 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 23 [2020-12-23 00:26:32,204 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:32,211 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:32,212 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:32,213 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:40, output treesize:16 [2020-12-23 00:26:32,303 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2020-12-23 00:26:32,305 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:32,307 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:32,308 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:32,308 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:6 [2020-12-23 00:26:32,359 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-23 00:26:32,359 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:32,359 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2020-12-23 00:26:32,360 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391096119] [2020-12-23 00:26:32,360 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 00:26:32,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:32,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 00:26:32,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:26:32,361 INFO L87 Difference]: Start difference. First operand 345 states and 448 transitions. Second operand 18 states. [2020-12-23 00:26:33,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:33,727 INFO L93 Difference]: Finished difference Result 453 states and 582 transitions. [2020-12-23 00:26:33,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-23 00:26:33,728 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 36 [2020-12-23 00:26:33,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:33,730 INFO L225 Difference]: With dead ends: 453 [2020-12-23 00:26:33,730 INFO L226 Difference]: Without dead ends: 383 [2020-12-23 00:26:33,731 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=159, Invalid=711, Unknown=0, NotChecked=0, Total=870 [2020-12-23 00:26:33,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2020-12-23 00:26:33,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 327. [2020-12-23 00:26:33,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-12-23 00:26:33,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 420 transitions. [2020-12-23 00:26:33,768 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 420 transitions. Word has length 36 [2020-12-23 00:26:33,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:33,768 INFO L481 AbstractCegarLoop]: Abstraction has 327 states and 420 transitions. [2020-12-23 00:26:33,768 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 00:26:33,768 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 420 transitions. [2020-12-23 00:26:33,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:26:33,769 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:33,769 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:33,975 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:26:33,976 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:33,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:33,977 INFO L82 PathProgramCache]: Analyzing trace with hash -278211137, now seen corresponding path program 2 times [2020-12-23 00:26:33,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:33,977 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832081788] [2020-12-23 00:26:33,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:34,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:34,350 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-23 00:26:34,350 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832081788] [2020-12-23 00:26:34,350 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069417594] [2020-12-23 00:26:34,350 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 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 00:26:34,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:26:34,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:26:34,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-23 00:26:34,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:34,554 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 00:26:34,554 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:34,554 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 16 [2020-12-23 00:26:34,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281017129] [2020-12-23 00:26:34,555 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 00:26:34,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:34,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 00:26:34,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:26:34,557 INFO L87 Difference]: Start difference. First operand 327 states and 420 transitions. Second operand 16 states. [2020-12-23 00:26:35,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:35,194 INFO L93 Difference]: Finished difference Result 578 states and 731 transitions. [2020-12-23 00:26:35,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 00:26:35,194 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-12-23 00:26:35,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:35,198 INFO L225 Difference]: With dead ends: 578 [2020-12-23 00:26:35,198 INFO L226 Difference]: Without dead ends: 573 [2020-12-23 00:26:35,199 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-12-23 00:26:35,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2020-12-23 00:26:35,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 376. [2020-12-23 00:26:35,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 376 states. [2020-12-23 00:26:35,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 485 transitions. [2020-12-23 00:26:35,244 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 485 transitions. Word has length 36 [2020-12-23 00:26:35,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:35,245 INFO L481 AbstractCegarLoop]: Abstraction has 376 states and 485 transitions. [2020-12-23 00:26:35,245 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 00:26:35,245 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 485 transitions. [2020-12-23 00:26:35,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 00:26:35,246 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:35,246 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:35,460 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:26:35,461 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:35,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:35,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1077561285, now seen corresponding path program 1 times [2020-12-23 00:26:35,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:35,463 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615277301] [2020-12-23 00:26:35,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:35,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:36,081 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:26:36,082 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615277301] [2020-12-23 00:26:36,082 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932001327] [2020-12-23 00:26:36,082 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 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 00:26:36,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:36,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-23 00:26:36,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:36,390 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 00:26:36,620 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:26:36,620 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:36,620 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 19 [2020-12-23 00:26:36,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932107475] [2020-12-23 00:26:36,621 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 00:26:36,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:36,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 00:26:36,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:26:36,622 INFO L87 Difference]: Start difference. First operand 376 states and 485 transitions. Second operand 19 states. [2020-12-23 00:26:37,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:37,530 INFO L93 Difference]: Finished difference Result 696 states and 887 transitions. [2020-12-23 00:26:37,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 00:26:37,530 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2020-12-23 00:26:37,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:37,534 INFO L225 Difference]: With dead ends: 696 [2020-12-23 00:26:37,534 INFO L226 Difference]: Without dead ends: 691 [2020-12-23 00:26:37,535 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2020-12-23 00:26:37,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 691 states. [2020-12-23 00:26:37,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 691 to 445. [2020-12-23 00:26:37,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 445 states. [2020-12-23 00:26:37,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 581 transitions. [2020-12-23 00:26:37,588 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 581 transitions. Word has length 36 [2020-12-23 00:26:37,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:37,588 INFO L481 AbstractCegarLoop]: Abstraction has 445 states and 581 transitions. [2020-12-23 00:26:37,588 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 00:26:37,588 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 581 transitions. [2020-12-23 00:26:37,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-23 00:26:37,589 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:37,590 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:37,797 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-23 00:26:37,798 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:37,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:37,799 INFO L82 PathProgramCache]: Analyzing trace with hash -445559009, now seen corresponding path program 2 times [2020-12-23 00:26:37,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:37,799 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977601223] [2020-12-23 00:26:37,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:37,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:37,881 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:26:37,881 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977601223] [2020-12-23 00:26:37,881 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885879096] [2020-12-23 00:26:37,881 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 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 00:26:37,952 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:26:37,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:26:37,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 00:26:37,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:38,057 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:26:38,057 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:38,057 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-12-23 00:26:38,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936157547] [2020-12-23 00:26:38,058 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 00:26:38,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:38,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 00:26:38,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:26:38,059 INFO L87 Difference]: Start difference. First operand 445 states and 581 transitions. Second operand 11 states. [2020-12-23 00:26:38,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:38,401 INFO L93 Difference]: Finished difference Result 725 states and 942 transitions. [2020-12-23 00:26:38,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 00:26:38,402 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 38 [2020-12-23 00:26:38,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:38,406 INFO L225 Difference]: With dead ends: 725 [2020-12-23 00:26:38,407 INFO L226 Difference]: Without dead ends: 590 [2020-12-23 00:26:38,410 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=126, Invalid=336, Unknown=0, NotChecked=0, Total=462 [2020-12-23 00:26:38,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2020-12-23 00:26:38,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 460. [2020-12-23 00:26:38,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 460 states. [2020-12-23 00:26:38,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 586 transitions. [2020-12-23 00:26:38,491 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 586 transitions. Word has length 38 [2020-12-23 00:26:38,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:38,492 INFO L481 AbstractCegarLoop]: Abstraction has 460 states and 586 transitions. [2020-12-23 00:26:38,492 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 00:26:38,492 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 586 transitions. [2020-12-23 00:26:38,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-23 00:26:38,493 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:38,493 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:38,707 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 00:26:38,708 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:38,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:38,709 INFO L82 PathProgramCache]: Analyzing trace with hash 532244478, now seen corresponding path program 4 times [2020-12-23 00:26:38,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:38,709 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556524605] [2020-12-23 00:26:38,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:38,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:38,802 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:26:38,802 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556524605] [2020-12-23 00:26:38,802 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699299453] [2020-12-23 00:26:38,802 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 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 00:26:38,855 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:26:38,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:26:38,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-23 00:26:38,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:38,964 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:26:38,964 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:38,964 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-12-23 00:26:38,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6667726] [2020-12-23 00:26:38,965 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 00:26:38,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:38,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 00:26:38,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:26:38,966 INFO L87 Difference]: Start difference. First operand 460 states and 586 transitions. Second operand 13 states. [2020-12-23 00:26:39,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:39,226 INFO L93 Difference]: Finished difference Result 654 states and 830 transitions. [2020-12-23 00:26:39,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 00:26:39,227 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-12-23 00:26:39,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:39,229 INFO L225 Difference]: With dead ends: 654 [2020-12-23 00:26:39,230 INFO L226 Difference]: Without dead ends: 409 [2020-12-23 00:26:39,231 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=171, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:26:39,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2020-12-23 00:26:39,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 337. [2020-12-23 00:26:39,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2020-12-23 00:26:39,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 432 transitions. [2020-12-23 00:26:39,276 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 432 transitions. Word has length 39 [2020-12-23 00:26:39,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:39,276 INFO L481 AbstractCegarLoop]: Abstraction has 337 states and 432 transitions. [2020-12-23 00:26:39,276 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 00:26:39,276 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 432 transitions. [2020-12-23 00:26:39,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-23 00:26:39,277 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:39,278 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:39,493 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 00:26:39,494 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:39,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:39,494 INFO L82 PathProgramCache]: Analyzing trace with hash -1417472424, now seen corresponding path program 5 times [2020-12-23 00:26:39,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:39,495 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975457875] [2020-12-23 00:26:39,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:39,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:39,576 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:26:39,577 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975457875] [2020-12-23 00:26:39,577 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894192474] [2020-12-23 00:26:39,577 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 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 00:26:39,663 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-23 00:26:39,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:26:39,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-23 00:26:39,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:39,786 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 00:26:39,787 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:39,787 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-12-23 00:26:39,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446809842] [2020-12-23 00:26:39,787 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 00:26:39,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:39,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 00:26:39,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:26:39,788 INFO L87 Difference]: Start difference. First operand 337 states and 432 transitions. Second operand 13 states. [2020-12-23 00:26:40,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:40,072 INFO L93 Difference]: Finished difference Result 382 states and 496 transitions. [2020-12-23 00:26:40,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 00:26:40,073 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-12-23 00:26:40,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:40,075 INFO L225 Difference]: With dead ends: 382 [2020-12-23 00:26:40,075 INFO L226 Difference]: Without dead ends: 318 [2020-12-23 00:26:40,076 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=95, Invalid=247, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:26:40,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2020-12-23 00:26:40,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 289. [2020-12-23 00:26:40,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2020-12-23 00:26:40,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 382 transitions. [2020-12-23 00:26:40,114 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 382 transitions. Word has length 39 [2020-12-23 00:26:40,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:40,115 INFO L481 AbstractCegarLoop]: Abstraction has 289 states and 382 transitions. [2020-12-23 00:26:40,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 00:26:40,115 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 382 transitions. [2020-12-23 00:26:40,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-23 00:26:40,116 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:40,116 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:40,329 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:26:40,329 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:40,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:40,331 INFO L82 PathProgramCache]: Analyzing trace with hash 825189825, now seen corresponding path program 6 times [2020-12-23 00:26:40,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:40,331 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685111973] [2020-12-23 00:26:40,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:40,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:40,405 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-12-23 00:26:40,405 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685111973] [2020-12-23 00:26:40,406 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129690357] [2020-12-23 00:26:40,406 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 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 00:26:40,712 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-23 00:26:40,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:26:40,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 00:26:40,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:40,818 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-12-23 00:26:40,818 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:40,818 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-12-23 00:26:40,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561440891] [2020-12-23 00:26:40,819 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 00:26:40,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:40,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 00:26:40,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:26:40,820 INFO L87 Difference]: Start difference. First operand 289 states and 382 transitions. Second operand 11 states. [2020-12-23 00:26:41,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:41,054 INFO L93 Difference]: Finished difference Result 360 states and 474 transitions. [2020-12-23 00:26:41,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 00:26:41,055 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-12-23 00:26:41,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:41,057 INFO L225 Difference]: With dead ends: 360 [2020-12-23 00:26:41,057 INFO L226 Difference]: Without dead ends: 286 [2020-12-23 00:26:41,057 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=83, Invalid=189, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:26:41,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-12-23 00:26:41,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 280. [2020-12-23 00:26:41,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-12-23 00:26:41,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 367 transitions. [2020-12-23 00:26:41,091 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 367 transitions. Word has length 45 [2020-12-23 00:26:41,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:41,091 INFO L481 AbstractCegarLoop]: Abstraction has 280 states and 367 transitions. [2020-12-23 00:26:41,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 00:26:41,092 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 367 transitions. [2020-12-23 00:26:41,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:26:41,092 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:41,093 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:41,305 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:26:41,306 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:41,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:41,307 INFO L82 PathProgramCache]: Analyzing trace with hash -159905373, now seen corresponding path program 7 times [2020-12-23 00:26:41,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:41,307 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919604743] [2020-12-23 00:26:41,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:41,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:41,943 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 00:26:41,944 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919604743] [2020-12-23 00:26:41,944 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554757190] [2020-12-23 00:26:41,944 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 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 00:26:42,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:42,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 00:26:42,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:42,660 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 00:26:42,660 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:42,660 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 24 [2020-12-23 00:26:42,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151631716] [2020-12-23 00:26:42,661 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 00:26:42,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:42,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 00:26:42,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:26:42,662 INFO L87 Difference]: Start difference. First operand 280 states and 367 transitions. Second operand 24 states. [2020-12-23 00:26:43,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:26:43,569 INFO L93 Difference]: Finished difference Result 630 states and 796 transitions. [2020-12-23 00:26:43,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 00:26:43,569 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 47 [2020-12-23 00:26:43,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:26:43,572 INFO L225 Difference]: With dead ends: 630 [2020-12-23 00:26:43,573 INFO L226 Difference]: Without dead ends: 625 [2020-12-23 00:26:43,573 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=122, Invalid=634, Unknown=0, NotChecked=0, Total=756 [2020-12-23 00:26:43,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2020-12-23 00:26:43,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 347. [2020-12-23 00:26:43,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 347 states. [2020-12-23 00:26:43,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 461 transitions. [2020-12-23 00:26:43,623 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 461 transitions. Word has length 47 [2020-12-23 00:26:43,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:26:43,624 INFO L481 AbstractCegarLoop]: Abstraction has 347 states and 461 transitions. [2020-12-23 00:26:43,624 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 00:26:43,624 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 461 transitions. [2020-12-23 00:26:43,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:26:43,625 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:26:43,625 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:26:43,839 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:26:43,839 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:26:43,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:26:43,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1615101989, now seen corresponding path program 2 times [2020-12-23 00:26:43,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:26:43,841 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405632178] [2020-12-23 00:26:43,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:26:43,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:26:45,283 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 00:26:45,283 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405632178] [2020-12-23 00:26:45,283 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810811442] [2020-12-23 00:26:45,283 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 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 00:26:45,358 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:26:45,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:26:45,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 43 conjunts are in the unsatisfiable core [2020-12-23 00:26:45,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:26:45,835 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2020-12-23 00:26:45,836 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:45,845 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:45,846 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:45,846 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:12 [2020-12-23 00:26:45,932 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2020-12-23 00:26:45,933 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:26:45,943 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:45,945 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2020-12-23 00:26:45,946 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:28, output treesize:24 [2020-12-23 00:26:47,201 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:26:47,202 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 24 [2020-12-23 00:26:47,204 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-23 00:26:47,224 INFO L625 ElimStorePlain]: treesize reduction 7, result has 63.2 percent of original size [2020-12-23 00:26:47,229 INFO L547 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:26:47,229 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:30, output treesize:5 [2020-12-23 00:26:47,301 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-23 00:26:47,301 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:26:47,301 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16] total 34 [2020-12-23 00:26:47,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295966520] [2020-12-23 00:26:47,304 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-12-23 00:26:47,304 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:26:47,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-12-23 00:26:47,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1020, Unknown=2, NotChecked=0, Total=1122 [2020-12-23 00:26:47,305 INFO L87 Difference]: Start difference. First operand 347 states and 461 transitions. Second operand 34 states. [2020-12-23 00:26:50,871 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 40 [2020-12-23 00:26:51,727 WARN L197 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 39 [2020-12-23 00:26:52,192 WARN L197 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 35 [2020-12-23 00:26:52,774 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-12-23 00:26:54,168 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 36 [2020-12-23 00:26:55,281 WARN L197 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 45 [2020-12-23 00:26:55,722 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 44 [2020-12-23 00:26:56,096 WARN L197 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 50 [2020-12-23 00:26:56,402 WARN L197 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 44 [2020-12-23 00:26:57,052 WARN L197 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 54 [2020-12-23 00:26:57,376 WARN L197 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 48 [2020-12-23 00:26:57,574 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 50 [2020-12-23 00:26:58,003 WARN L197 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 47 [2020-12-23 00:26:58,168 WARN L197 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 42 [2020-12-23 00:26:58,747 WARN L197 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 51 [2020-12-23 00:26:58,916 WARN L197 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 46 [2020-12-23 00:26:59,105 WARN L197 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 47 [2020-12-23 00:26:59,715 WARN L197 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 42 [2020-12-23 00:27:00,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:27:00,051 INFO L93 Difference]: Finished difference Result 949 states and 1260 transitions. [2020-12-23 00:27:00,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2020-12-23 00:27:00,052 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 47 [2020-12-23 00:27:00,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:27:00,056 INFO L225 Difference]: With dead ends: 949 [2020-12-23 00:27:00,056 INFO L226 Difference]: Without dead ends: 911 [2020-12-23 00:27:00,060 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3406 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=1535, Invalid=9804, Unknown=3, NotChecked=0, Total=11342 [2020-12-23 00:27:00,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 911 states. [2020-12-23 00:27:00,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 911 to 516. [2020-12-23 00:27:00,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 516 states. [2020-12-23 00:27:00,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 678 transitions. [2020-12-23 00:27:00,147 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 678 transitions. Word has length 47 [2020-12-23 00:27:00,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:27:00,147 INFO L481 AbstractCegarLoop]: Abstraction has 516 states and 678 transitions. [2020-12-23 00:27:00,147 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-12-23 00:27:00,147 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 678 transitions. [2020-12-23 00:27:00,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:27:00,148 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:27:00,149 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:27:00,358 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-23 00:27:00,359 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:27:00,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:27:00,360 INFO L82 PathProgramCache]: Analyzing trace with hash -552932383, now seen corresponding path program 3 times [2020-12-23 00:27:00,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:27:00,360 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476222159] [2020-12-23 00:27:00,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:27:00,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:27:01,939 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 9 proven. 29 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-23 00:27:01,940 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476222159] [2020-12-23 00:27:01,940 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931831212] [2020-12-23 00:27:01,940 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:27:02,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-23 00:27:02,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:27:02,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 47 conjunts are in the unsatisfiable core [2020-12-23 00:27:02,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:27:02,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:27:02,645 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:02,645 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 93 [2020-12-23 00:27:02,648 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:27:02,651 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:02,778 WARN L197 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 30 [2020-12-23 00:27:02,779 INFO L625 ElimStorePlain]: treesize reduction 88, result has 38.9 percent of original size [2020-12-23 00:27:02,781 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 00:27:02,783 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-23 00:27:02,783 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:52, output treesize:56 [2020-12-23 00:27:02,785 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 00:27:02,885 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 00:27:03,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:27:03,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:27:03,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:27:03,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:27:03,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:27:03,068 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:03,068 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 58 treesize of output 72 [2020-12-23 00:27:03,072 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:03,116 INFO L625 ElimStorePlain]: treesize reduction 31, result has 63.1 percent of original size [2020-12-23 00:27:03,118 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-23 00:27:03,118 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:77, output treesize:53 [2020-12-23 00:27:03,478 INFO L173 IndexEqualityManager]: detected equality via solver [2020-12-23 00:27:03,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-12-23 00:27:03,481 INFO L173 IndexEqualityManager]: detected equality via solver [2020-12-23 00:27:03,484 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:03,485 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 46 [2020-12-23 00:27:03,489 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:03,545 INFO L625 ElimStorePlain]: treesize reduction 16, result has 70.4 percent of original size [2020-12-23 00:27:03,549 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:03,549 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:55, output treesize:19 [2020-12-23 00:27:03,665 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:03,666 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2020-12-23 00:27:03,669 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-23 00:27:03,683 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:03,684 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:03,684 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:19 [2020-12-23 00:27:03,769 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:27:04,094 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-23 00:27:04,095 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:27:04,095 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 38 [2020-12-23 00:27:04,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877433832] [2020-12-23 00:27:04,096 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-12-23 00:27:04,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:27:04,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-12-23 00:27:04,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1259, Unknown=0, NotChecked=0, Total=1406 [2020-12-23 00:27:04,097 INFO L87 Difference]: Start difference. First operand 516 states and 678 transitions. Second operand 38 states. [2020-12-23 00:27:06,828 WARN L197 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 48 [2020-12-23 00:27:07,127 WARN L197 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 51 [2020-12-23 00:27:09,634 WARN L197 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 40 [2020-12-23 00:27:09,808 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 35 [2020-12-23 00:27:10,190 WARN L197 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 50 [2020-12-23 00:27:10,366 WARN L197 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 45 [2020-12-23 00:27:10,794 WARN L197 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 34 [2020-12-23 00:27:10,992 WARN L197 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 50 [2020-12-23 00:27:13,793 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 38 [2020-12-23 00:27:14,259 WARN L197 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-12-23 00:27:14,477 WARN L197 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 47 [2020-12-23 00:27:14,680 WARN L197 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 34 [2020-12-23 00:27:15,120 WARN L197 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 59 [2020-12-23 00:27:15,402 WARN L197 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 46 [2020-12-23 00:27:15,616 WARN L197 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 34 [2020-12-23 00:27:15,944 WARN L197 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 61 [2020-12-23 00:27:16,261 WARN L197 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 49 [2020-12-23 00:27:16,856 WARN L197 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 61 [2020-12-23 00:27:17,178 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2020-12-23 00:27:17,596 WARN L197 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 67 [2020-12-23 00:27:18,220 WARN L197 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 46 [2020-12-23 00:27:18,706 WARN L197 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 68 [2020-12-23 00:27:19,372 WARN L197 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 67 [2020-12-23 00:27:19,571 WARN L197 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 48 [2020-12-23 00:27:20,168 WARN L197 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 65 [2020-12-23 00:27:20,717 WARN L197 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 49 [2020-12-23 00:27:21,034 WARN L197 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 49 [2020-12-23 00:27:21,588 WARN L197 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 75 [2020-12-23 00:27:21,884 WARN L197 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 47 [2020-12-23 00:27:22,546 WARN L197 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 57 [2020-12-23 00:27:23,063 WARN L197 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 50 [2020-12-23 00:27:23,293 WARN L197 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 33 [2020-12-23 00:27:23,679 WARN L197 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2020-12-23 00:27:24,034 WARN L197 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 28 [2020-12-23 00:27:24,629 WARN L197 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 30 [2020-12-23 00:27:25,277 WARN L197 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 51 [2020-12-23 00:27:25,477 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 38 [2020-12-23 00:27:26,260 WARN L197 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 51 [2020-12-23 00:27:26,484 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 39 [2020-12-23 00:27:26,771 WARN L197 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 36 [2020-12-23 00:27:27,067 WARN L197 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 36 [2020-12-23 00:27:27,310 WARN L197 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 27 [2020-12-23 00:27:27,674 WARN L197 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 38 [2020-12-23 00:27:28,008 WARN L197 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 38 [2020-12-23 00:27:28,378 WARN L197 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 43 [2020-12-23 00:27:28,600 WARN L197 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2020-12-23 00:27:29,002 WARN L197 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2020-12-23 00:27:29,314 WARN L197 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 31 [2020-12-23 00:27:30,000 WARN L197 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 45 [2020-12-23 00:27:30,315 WARN L197 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 55 [2020-12-23 00:27:31,025 WARN L197 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 58 [2020-12-23 00:27:31,275 WARN L197 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 41 [2020-12-23 00:27:31,670 WARN L197 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 43 [2020-12-23 00:27:31,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:27:31,696 INFO L93 Difference]: Finished difference Result 1222 states and 1597 transitions. [2020-12-23 00:27:31,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-12-23 00:27:31,701 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 47 [2020-12-23 00:27:31,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:27:31,706 INFO L225 Difference]: With dead ends: 1222 [2020-12-23 00:27:31,706 INFO L226 Difference]: Without dead ends: 1150 [2020-12-23 00:27:31,713 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 31 SyntacticMatches, 4 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6135 ImplicationChecksByTransitivity, 24.7s TimeCoverageRelationStatistics Valid=2439, Invalid=17582, Unknown=1, NotChecked=0, Total=20022 [2020-12-23 00:27:31,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1150 states. [2020-12-23 00:27:31,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1150 to 807. [2020-12-23 00:27:31,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 807 states. [2020-12-23 00:27:31,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 807 states to 807 states and 1045 transitions. [2020-12-23 00:27:31,903 INFO L78 Accepts]: Start accepts. Automaton has 807 states and 1045 transitions. Word has length 47 [2020-12-23 00:27:31,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:27:31,904 INFO L481 AbstractCegarLoop]: Abstraction has 807 states and 1045 transitions. [2020-12-23 00:27:31,904 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-12-23 00:27:31,904 INFO L276 IsEmpty]: Start isEmpty. Operand 807 states and 1045 transitions. [2020-12-23 00:27:31,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:27:31,906 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:27:31,906 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:27:32,119 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-23 00:27:32,120 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:27:32,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:27:32,121 INFO L82 PathProgramCache]: Analyzing trace with hash -19356763, now seen corresponding path program 2 times [2020-12-23 00:27:32,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:27:32,122 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130779765] [2020-12-23 00:27:32,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:27:32,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:27:32,387 WARN L197 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 13 [2020-12-23 00:27:32,960 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 00:27:32,960 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130779765] [2020-12-23 00:27:32,960 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836371181] [2020-12-23 00:27:32,960 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:27:33,255 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:27:33,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:27:33,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 51 conjunts are in the unsatisfiable core [2020-12-23 00:27:33,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:27:34,053 INFO L348 Elim1Store]: treesize reduction 54, result has 49.1 percent of original size [2020-12-23 00:27:34,054 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 69 [2020-12-23 00:27:34,058 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:27:34,064 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:34,144 INFO L625 ElimStorePlain]: treesize reduction 108, result has 33.7 percent of original size [2020-12-23 00:27:34,145 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:34,146 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:46, output treesize:55 [2020-12-23 00:27:34,398 INFO L348 Elim1Store]: treesize reduction 78, result has 17.9 percent of original size [2020-12-23 00:27:34,399 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 58 treesize of output 42 [2020-12-23 00:27:34,403 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:34,418 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:34,424 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:34,424 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:64, output treesize:47 [2020-12-23 00:27:34,633 INFO L348 Elim1Store]: treesize reduction 12, result has 87.4 percent of original size [2020-12-23 00:27:34,634 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 111 [2020-12-23 00:27:34,641 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 6 disjuncts [2020-12-23 00:27:34,642 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 00:27:34,644 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:27:34,645 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:27:34,652 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:34,743 INFO L625 ElimStorePlain]: treesize reduction 189, result has 18.9 percent of original size [2020-12-23 00:27:34,747 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:34,747 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:66, output treesize:29 [2020-12-23 00:27:34,926 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:34,926 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 31 [2020-12-23 00:27:34,934 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 00:27:34,937 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:27:34,946 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-23 00:27:34,988 INFO L625 ElimStorePlain]: treesize reduction 34, result has 33.3 percent of original size [2020-12-23 00:27:34,989 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:34,989 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:40, output treesize:17 [2020-12-23 00:27:35,104 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-23 00:27:35,104 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:27:35,104 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 31 [2020-12-23 00:27:35,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671877111] [2020-12-23 00:27:35,105 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-12-23 00:27:35,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:27:35,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-12-23 00:27:35,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=828, Unknown=0, NotChecked=0, Total=930 [2020-12-23 00:27:35,106 INFO L87 Difference]: Start difference. First operand 807 states and 1045 transitions. Second operand 31 states. [2020-12-23 00:27:35,626 WARN L197 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 35 [2020-12-23 00:27:36,406 WARN L197 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 43 [2020-12-23 00:27:36,630 WARN L197 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 39 [2020-12-23 00:27:37,484 WARN L197 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 41 [2020-12-23 00:27:37,639 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 37 [2020-12-23 00:27:39,047 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 36 [2020-12-23 00:27:39,854 WARN L197 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 42 [2020-12-23 00:27:43,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:27:43,298 INFO L93 Difference]: Finished difference Result 1402 states and 1821 transitions. [2020-12-23 00:27:43,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-12-23 00:27:43,300 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 47 [2020-12-23 00:27:43,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:27:43,304 INFO L225 Difference]: With dead ends: 1402 [2020-12-23 00:27:43,304 INFO L226 Difference]: Without dead ends: 1196 [2020-12-23 00:27:43,306 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1725 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=720, Invalid=4980, Unknown=0, NotChecked=0, Total=5700 [2020-12-23 00:27:43,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1196 states. [2020-12-23 00:27:43,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1196 to 978. [2020-12-23 00:27:43,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 978 states. [2020-12-23 00:27:43,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 978 states to 978 states and 1239 transitions. [2020-12-23 00:27:43,557 INFO L78 Accepts]: Start accepts. Automaton has 978 states and 1239 transitions. Word has length 47 [2020-12-23 00:27:43,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:27:43,557 INFO L481 AbstractCegarLoop]: Abstraction has 978 states and 1239 transitions. [2020-12-23 00:27:43,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-12-23 00:27:43,558 INFO L276 IsEmpty]: Start isEmpty. Operand 978 states and 1239 transitions. [2020-12-23 00:27:43,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:27:43,560 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:27:43,561 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:27:43,773 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2020-12-23 00:27:43,774 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:27:43,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:27:43,774 INFO L82 PathProgramCache]: Analyzing trace with hash 499626149, now seen corresponding path program 2 times [2020-12-23 00:27:43,774 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:27:43,775 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345763589] [2020-12-23 00:27:43,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:27:43,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:27:44,037 WARN L197 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 13 [2020-12-23 00:27:44,526 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 00:27:44,526 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345763589] [2020-12-23 00:27:44,526 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279615498] [2020-12-23 00:27:44,526 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:27:44,756 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:27:44,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:27:44,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 36 conjunts are in the unsatisfiable core [2020-12-23 00:27:44,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:27:45,153 INFO L348 Elim1Store]: treesize reduction 86, result has 16.5 percent of original size [2020-12-23 00:27:45,153 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 32 [2020-12-23 00:27:45,158 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:45,178 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:45,182 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:45,183 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:16 [2020-12-23 00:27:45,406 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2020-12-23 00:27:45,408 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:45,411 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:45,412 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:45,412 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:6 [2020-12-23 00:27:45,526 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 00:27:45,527 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:27:45,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2020-12-23 00:27:45,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089119798] [2020-12-23 00:27:45,527 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-23 00:27:45,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:27:45,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-23 00:27:45,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=407, Unknown=0, NotChecked=0, Total=462 [2020-12-23 00:27:45,529 INFO L87 Difference]: Start difference. First operand 978 states and 1239 transitions. Second operand 22 states. [2020-12-23 00:27:46,888 WARN L197 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-12-23 00:27:47,969 WARN L197 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 37 [2020-12-23 00:27:49,142 WARN L197 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 27 [2020-12-23 00:27:49,420 WARN L197 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 34 [2020-12-23 00:27:49,716 WARN L197 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 38 [2020-12-23 00:27:51,322 WARN L197 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 40 [2020-12-23 00:27:52,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:27:52,261 INFO L93 Difference]: Finished difference Result 1893 states and 2424 transitions. [2020-12-23 00:27:52,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-23 00:27:52,264 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 47 [2020-12-23 00:27:52,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:27:52,270 INFO L225 Difference]: With dead ends: 1893 [2020-12-23 00:27:52,270 INFO L226 Difference]: Without dead ends: 1551 [2020-12-23 00:27:52,271 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=400, Invalid=2252, Unknown=0, NotChecked=0, Total=2652 [2020-12-23 00:27:52,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1551 states. [2020-12-23 00:27:52,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1551 to 1118. [2020-12-23 00:27:52,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1118 states. [2020-12-23 00:27:52,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1118 states to 1118 states and 1391 transitions. [2020-12-23 00:27:52,518 INFO L78 Accepts]: Start accepts. Automaton has 1118 states and 1391 transitions. Word has length 47 [2020-12-23 00:27:52,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:27:52,518 INFO L481 AbstractCegarLoop]: Abstraction has 1118 states and 1391 transitions. [2020-12-23 00:27:52,518 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-23 00:27:52,518 INFO L276 IsEmpty]: Start isEmpty. Operand 1118 states and 1391 transitions. [2020-12-23 00:27:52,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:27:52,521 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:27:52,521 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:27:52,734 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-23 00:27:52,735 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:27:52,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:27:52,736 INFO L82 PathProgramCache]: Analyzing trace with hash 247147749, now seen corresponding path program 3 times [2020-12-23 00:27:52,736 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:27:52,736 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771760192] [2020-12-23 00:27:52,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:27:52,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:27:53,624 WARN L197 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 24 [2020-12-23 00:27:53,725 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-23 00:27:53,725 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771760192] [2020-12-23 00:27:53,725 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017355081] [2020-12-23 00:27:53,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:27:53,955 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-23 00:27:53,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:27:53,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 00:27:53,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:27:54,021 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 00:27:54,211 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 00:27:54,699 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-23 00:27:54,700 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:27:54,700 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 19 [2020-12-23 00:27:54,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633802351] [2020-12-23 00:27:54,701 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 00:27:54,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:27:54,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 00:27:54,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:27:54,702 INFO L87 Difference]: Start difference. First operand 1118 states and 1391 transitions. Second operand 19 states. [2020-12-23 00:27:56,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:27:56,637 INFO L93 Difference]: Finished difference Result 1721 states and 2127 transitions. [2020-12-23 00:27:56,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 00:27:56,639 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2020-12-23 00:27:56,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:27:56,645 INFO L225 Difference]: With dead ends: 1721 [2020-12-23 00:27:56,645 INFO L226 Difference]: Without dead ends: 1716 [2020-12-23 00:27:56,645 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:27:56,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1716 states. [2020-12-23 00:27:56,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1716 to 1209. [2020-12-23 00:27:56,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1209 states. [2020-12-23 00:27:56,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1209 states to 1209 states and 1504 transitions. [2020-12-23 00:27:56,932 INFO L78 Accepts]: Start accepts. Automaton has 1209 states and 1504 transitions. Word has length 47 [2020-12-23 00:27:56,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:27:56,932 INFO L481 AbstractCegarLoop]: Abstraction has 1209 states and 1504 transitions. [2020-12-23 00:27:56,932 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 00:27:56,932 INFO L276 IsEmpty]: Start isEmpty. Operand 1209 states and 1504 transitions. [2020-12-23 00:27:56,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:27:56,941 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:27:56,942 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:27:57,155 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2020-12-23 00:27:57,156 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:27:57,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:27:57,157 INFO L82 PathProgramCache]: Analyzing trace with hash -830112797, now seen corresponding path program 3 times [2020-12-23 00:27:57,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:27:57,157 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897079172] [2020-12-23 00:27:57,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:27:57,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:27:57,998 WARN L197 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 32 [2020-12-23 00:27:58,186 WARN L197 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 33 [2020-12-23 00:27:58,711 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 30 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-23 00:27:58,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897079172] [2020-12-23 00:27:58,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123201856] [2020-12-23 00:27:58,712 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:27:58,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-23 00:27:58,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:27:58,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-23 00:27:58,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:27:59,045 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2020-12-23 00:27:59,048 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:59,052 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:59,053 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:59,054 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:6 [2020-12-23 00:27:59,141 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2020-12-23 00:27:59,143 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:27:59,162 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:59,166 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2020-12-23 00:27:59,166 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:31, output treesize:122 [2020-12-23 00:27:59,308 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:27:59,309 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 34 [2020-12-23 00:27:59,316 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:27:59,320 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 00:27:59,322 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:27:59,327 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-23 00:27:59,394 INFO L625 ElimStorePlain]: treesize reduction 27, result has 50.9 percent of original size [2020-12-23 00:27:59,396 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:27:59,396 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:28 [2020-12-23 00:27:59,657 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-23 00:27:59,657 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:27:59,657 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 27 [2020-12-23 00:27:59,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454450684] [2020-12-23 00:27:59,658 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-23 00:27:59,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:27:59,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-23 00:27:59,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2020-12-23 00:27:59,659 INFO L87 Difference]: Start difference. First operand 1209 states and 1504 transitions. Second operand 27 states. [2020-12-23 00:28:02,992 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2020-12-23 00:28:03,727 WARN L197 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 46 [2020-12-23 00:28:04,194 WARN L197 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 45 [2020-12-23 00:28:06,880 WARN L197 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 44 [2020-12-23 00:28:07,235 WARN L197 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 47 [2020-12-23 00:28:07,434 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 46 [2020-12-23 00:28:07,866 WARN L197 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 52 [2020-12-23 00:28:08,258 WARN L197 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 46 [2020-12-23 00:28:08,703 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 52 [2020-12-23 00:28:09,172 WARN L197 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 46 [2020-12-23 00:28:09,699 WARN L197 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 51 [2020-12-23 00:28:09,912 WARN L197 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 46 [2020-12-23 00:28:10,296 WARN L197 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 51 [2020-12-23 00:28:10,557 WARN L197 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 55 [2020-12-23 00:28:10,960 WARN L197 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 56 [2020-12-23 00:28:13,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:28:13,531 INFO L93 Difference]: Finished difference Result 1470 states and 1810 transitions. [2020-12-23 00:28:13,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-12-23 00:28:13,532 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 47 [2020-12-23 00:28:13,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:28:13,537 INFO L225 Difference]: With dead ends: 1470 [2020-12-23 00:28:13,537 INFO L226 Difference]: Without dead ends: 1450 [2020-12-23 00:28:13,538 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3445 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=1509, Invalid=9621, Unknown=0, NotChecked=0, Total=11130 [2020-12-23 00:28:13,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1450 states. [2020-12-23 00:28:13,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1450 to 1224. [2020-12-23 00:28:13,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1224 states. [2020-12-23 00:28:13,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1224 states to 1224 states and 1523 transitions. [2020-12-23 00:28:13,773 INFO L78 Accepts]: Start accepts. Automaton has 1224 states and 1523 transitions. Word has length 47 [2020-12-23 00:28:13,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:28:13,773 INFO L481 AbstractCegarLoop]: Abstraction has 1224 states and 1523 transitions. [2020-12-23 00:28:13,773 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-23 00:28:13,773 INFO L276 IsEmpty]: Start isEmpty. Operand 1224 states and 1523 transitions. [2020-12-23 00:28:13,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:28:13,777 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:28:13,777 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:28:13,991 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:28:13,992 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:28:13,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:28:13,993 INFO L82 PathProgramCache]: Analyzing trace with hash 944894565, now seen corresponding path program 4 times [2020-12-23 00:28:13,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:28:13,993 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322371308] [2020-12-23 00:28:13,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:28:14,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:28:14,249 WARN L197 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 9 [2020-12-23 00:28:14,476 WARN L197 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 12 [2020-12-23 00:28:14,930 WARN L197 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 17 [2020-12-23 00:28:15,031 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-23 00:28:15,031 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322371308] [2020-12-23 00:28:15,031 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611088810] [2020-12-23 00:28:15,032 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:28:15,157 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:28:15,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:28:15,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 00:28:15,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:28:15,737 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-23 00:28:15,737 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:28:15,737 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 20 [2020-12-23 00:28:15,737 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631793206] [2020-12-23 00:28:15,738 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 00:28:15,738 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:28:15,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 00:28:15,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:28:15,738 INFO L87 Difference]: Start difference. First operand 1224 states and 1523 transitions. Second operand 20 states. [2020-12-23 00:28:17,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:28:17,780 INFO L93 Difference]: Finished difference Result 1575 states and 1951 transitions. [2020-12-23 00:28:17,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 00:28:17,782 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-12-23 00:28:17,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:28:17,788 INFO L225 Difference]: With dead ends: 1575 [2020-12-23 00:28:17,789 INFO L226 Difference]: Without dead ends: 1559 [2020-12-23 00:28:17,790 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 41 SyntacticMatches, 6 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2020-12-23 00:28:17,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1559 states. [2020-12-23 00:28:18,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1559 to 1297. [2020-12-23 00:28:18,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1297 states. [2020-12-23 00:28:18,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1297 states to 1297 states and 1617 transitions. [2020-12-23 00:28:18,055 INFO L78 Accepts]: Start accepts. Automaton has 1297 states and 1617 transitions. Word has length 47 [2020-12-23 00:28:18,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:28:18,055 INFO L481 AbstractCegarLoop]: Abstraction has 1297 states and 1617 transitions. [2020-12-23 00:28:18,055 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 00:28:18,056 INFO L276 IsEmpty]: Start isEmpty. Operand 1297 states and 1617 transitions. [2020-12-23 00:28:18,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:28:18,059 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:28:18,059 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:28:18,272 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-23 00:28:18,273 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:28:18,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:28:18,274 INFO L82 PathProgramCache]: Analyzing trace with hash 1351947687, now seen corresponding path program 5 times [2020-12-23 00:28:18,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:28:18,274 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752785558] [2020-12-23 00:28:18,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:28:18,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:28:18,962 WARN L197 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 19 [2020-12-23 00:28:19,081 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-23 00:28:19,081 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752785558] [2020-12-23 00:28:19,082 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457105196] [2020-12-23 00:28:19,082 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:28:19,242 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-23 00:28:19,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:28:19,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 00:28:19,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:28:19,320 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:28:19,327 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:28:19,760 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-23 00:28:19,761 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:28:19,761 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 18 [2020-12-23 00:28:19,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050147887] [2020-12-23 00:28:19,761 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 00:28:19,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:28:19,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 00:28:19,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:28:19,762 INFO L87 Difference]: Start difference. First operand 1297 states and 1617 transitions. Second operand 18 states. [2020-12-23 00:28:21,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:28:21,678 INFO L93 Difference]: Finished difference Result 1855 states and 2319 transitions. [2020-12-23 00:28:21,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:28:21,680 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 47 [2020-12-23 00:28:21,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:28:21,687 INFO L225 Difference]: With dead ends: 1855 [2020-12-23 00:28:21,688 INFO L226 Difference]: Without dead ends: 1850 [2020-12-23 00:28:21,689 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 38 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2020-12-23 00:28:21,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1850 states. [2020-12-23 00:28:21,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1850 to 1387. [2020-12-23 00:28:21,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1387 states. [2020-12-23 00:28:21,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1387 states to 1387 states and 1736 transitions. [2020-12-23 00:28:21,965 INFO L78 Accepts]: Start accepts. Automaton has 1387 states and 1736 transitions. Word has length 47 [2020-12-23 00:28:21,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:28:21,965 INFO L481 AbstractCegarLoop]: Abstraction has 1387 states and 1736 transitions. [2020-12-23 00:28:21,965 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 00:28:21,965 INFO L276 IsEmpty]: Start isEmpty. Operand 1387 states and 1736 transitions. [2020-12-23 00:28:21,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:28:21,968 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:28:21,968 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:28:22,174 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:28:22,175 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:28:22,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:28:22,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1566771741, now seen corresponding path program 4 times [2020-12-23 00:28:22,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:28:22,176 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069003472] [2020-12-23 00:28:22,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:28:22,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:28:22,775 WARN L197 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 19 [2020-12-23 00:28:22,920 WARN L197 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 23 [2020-12-23 00:28:23,106 WARN L197 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 31 [2020-12-23 00:28:23,301 WARN L197 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 36 [2020-12-23 00:28:23,456 WARN L197 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 31 [2020-12-23 00:28:23,993 WARN L197 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 28 [2020-12-23 00:28:24,407 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-23 00:28:24,408 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2069003472] [2020-12-23 00:28:24,408 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261708573] [2020-12-23 00:28:24,408 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:28:24,571 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:28:24,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:28:24,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 55 conjunts are in the unsatisfiable core [2020-12-23 00:28:24,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:28:26,339 WARN L197 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-12-23 00:28:26,340 INFO L348 Elim1Store]: treesize reduction 56, result has 51.7 percent of original size [2020-12-23 00:28:26,341 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 39 treesize of output 77 [2020-12-23 00:28:26,345 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:28:26,351 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:28:26,485 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 33 [2020-12-23 00:28:26,487 INFO L625 ElimStorePlain]: treesize reduction 126, result has 33.7 percent of original size [2020-12-23 00:28:26,490 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-23 00:28:26,491 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:53, output treesize:64 [2020-12-23 00:28:27,330 WARN L197 SmtUtils]: Spent 408.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 49 [2020-12-23 00:28:27,332 INFO L348 Elim1Store]: treesize reduction 94, result has 62.4 percent of original size [2020-12-23 00:28:27,333 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 67 treesize of output 183 [2020-12-23 00:28:27,345 INFO L398 QuantifierPusher]: Applying distributivity to a CONJUNCTION[4, 2, 1] term [2020-12-23 00:28:27,346 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:28:27,347 INFO L398 QuantifierPusher]: Applying distributivity to a CONJUNCTION[3, 2, 1] term [2020-12-23 00:28:27,347 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 00:28:27,348 INFO L398 QuantifierPusher]: Applying distributivity to a CONJUNCTION[2, 2, 1] term [2020-12-23 00:28:27,349 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:28:27,354 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 6 disjuncts [2020-12-23 00:28:27,356 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 00:28:27,357 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 00:28:27,359 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 6 disjuncts [2020-12-23 00:28:27,361 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 00:28:27,363 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 6 disjuncts [2020-12-23 00:28:27,364 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 00:28:27,367 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:28:27,368 INFO L639 QuantifierPusher]: Distributing 3 conjuncts over 2 disjuncts [2020-12-23 00:28:27,370 INFO L639 QuantifierPusher]: Distributing 3 conjuncts over 2 disjuncts [2020-12-23 00:28:27,371 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:28:27,382 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:28:27,396 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:28:27,676 WARN L197 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 31 [2020-12-23 00:28:27,678 INFO L625 ElimStorePlain]: treesize reduction 445, result has 10.8 percent of original size [2020-12-23 00:28:27,681 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:28:27,681 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:86, output treesize:49 [2020-12-23 00:28:28,505 WARN L197 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2020-12-23 00:28:28,506 INFO L348 Elim1Store]: treesize reduction 32, result has 78.4 percent of original size [2020-12-23 00:28:28,507 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 144 [2020-12-23 00:28:28,515 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:28:28,518 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 00:28:28,521 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:28:28,525 INFO L398 QuantifierPusher]: Applying distributivity to a CONJUNCTION[2, 2, 1] term [2020-12-23 00:28:28,525 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:28:28,530 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:28:28,659 WARN L197 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 28 [2020-12-23 00:28:28,660 INFO L625 ElimStorePlain]: treesize reduction 124, result has 24.4 percent of original size [2020-12-23 00:28:28,665 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:28:28,666 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:62, output treesize:25 [2020-12-23 00:28:28,822 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:28:28,823 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 29 [2020-12-23 00:28:28,831 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:28:28,833 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 00:28:28,834 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:28:28,839 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-23 00:28:28,890 INFO L625 ElimStorePlain]: treesize reduction 34, result has 33.3 percent of original size [2020-12-23 00:28:28,891 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:28:28,892 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:36, output treesize:17 [2020-12-23 00:28:29,062 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 28 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-23 00:28:29,063 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:28:29,063 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 41 [2020-12-23 00:28:29,063 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358637395] [2020-12-23 00:28:29,063 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-12-23 00:28:29,063 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:28:29,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-12-23 00:28:29,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1495, Unknown=0, NotChecked=0, Total=1640 [2020-12-23 00:28:29,064 INFO L87 Difference]: Start difference. First operand 1387 states and 1736 transitions. Second operand 41 states. [2020-12-23 00:28:30,038 WARN L197 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-12-23 00:28:30,311 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-12-23 00:28:30,578 WARN L197 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 34 [2020-12-23 00:28:30,840 WARN L197 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-12-23 00:28:31,248 WARN L197 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 23 [2020-12-23 00:28:31,478 WARN L197 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2020-12-23 00:28:31,881 WARN L197 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 33 [2020-12-23 00:28:32,186 WARN L197 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 17 [2020-12-23 00:28:32,577 WARN L197 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 32 [2020-12-23 00:28:32,888 WARN L197 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 24 [2020-12-23 00:28:33,274 WARN L197 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 37 [2020-12-23 00:28:33,747 WARN L197 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 32 [2020-12-23 00:28:34,170 WARN L197 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 44 [2020-12-23 00:28:34,602 WARN L197 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 24 [2020-12-23 00:28:34,881 WARN L197 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 30 [2020-12-23 00:28:35,265 WARN L197 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 34 [2020-12-23 00:28:35,688 WARN L197 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 46 [2020-12-23 00:28:35,970 WARN L197 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 32 [2020-12-23 00:28:36,417 WARN L197 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 37 [2020-12-23 00:28:36,869 WARN L197 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 34 [2020-12-23 00:28:37,282 WARN L197 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 39 [2020-12-23 00:28:37,475 WARN L197 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 32 [2020-12-23 00:28:37,976 WARN L197 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 51 [2020-12-23 00:28:38,733 WARN L197 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 33 [2020-12-23 00:28:39,204 WARN L197 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 41 [2020-12-23 00:28:39,679 WARN L197 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 50 [2020-12-23 00:28:40,371 WARN L197 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 44 [2020-12-23 00:28:40,646 WARN L197 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 35 [2020-12-23 00:28:41,282 WARN L197 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 42 [2020-12-23 00:28:41,709 WARN L197 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 42 [2020-12-23 00:28:42,006 WARN L197 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 37 [2020-12-23 00:28:42,495 WARN L197 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 52 [2020-12-23 00:28:43,034 WARN L197 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 40 [2020-12-23 00:28:43,779 WARN L197 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 38 [2020-12-23 00:28:44,342 WARN L197 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 45 [2020-12-23 00:28:44,668 WARN L197 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2020-12-23 00:28:45,198 WARN L197 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 43 [2020-12-23 00:28:45,619 WARN L197 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 51 [2020-12-23 00:28:46,417 WARN L197 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 44 [2020-12-23 00:28:47,010 WARN L197 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 49 [2020-12-23 00:28:47,800 WARN L197 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2020-12-23 00:28:48,781 WARN L197 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 46 [2020-12-23 00:28:49,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:28:49,373 INFO L93 Difference]: Finished difference Result 1830 states and 2274 transitions. [2020-12-23 00:28:49,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-12-23 00:28:49,375 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 47 [2020-12-23 00:28:49,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:28:49,382 INFO L225 Difference]: With dead ends: 1830 [2020-12-23 00:28:49,382 INFO L226 Difference]: Without dead ends: 1789 [2020-12-23 00:28:49,384 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2032 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=1030, Invalid=6802, Unknown=0, NotChecked=0, Total=7832 [2020-12-23 00:28:49,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1789 states. [2020-12-23 00:28:49,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1789 to 1419. [2020-12-23 00:28:49,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1419 states. [2020-12-23 00:28:49,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1419 states to 1419 states and 1776 transitions. [2020-12-23 00:28:49,733 INFO L78 Accepts]: Start accepts. Automaton has 1419 states and 1776 transitions. Word has length 47 [2020-12-23 00:28:49,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:28:49,733 INFO L481 AbstractCegarLoop]: Abstraction has 1419 states and 1776 transitions. [2020-12-23 00:28:49,734 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-12-23 00:28:49,734 INFO L276 IsEmpty]: Start isEmpty. Operand 1419 states and 1776 transitions. [2020-12-23 00:28:49,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:28:49,736 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:28:49,736 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:28:49,940 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-23 00:28:49,941 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:28:49,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:28:49,942 INFO L82 PathProgramCache]: Analyzing trace with hash 2141389541, now seen corresponding path program 6 times [2020-12-23 00:28:49,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:28:49,943 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052029926] [2020-12-23 00:28:49,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:28:50,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:28:50,238 WARN L197 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 9 [2020-12-23 00:28:50,640 WARN L197 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 12 [2020-12-23 00:28:51,052 WARN L197 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 24 [2020-12-23 00:28:51,153 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-23 00:28:51,154 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052029926] [2020-12-23 00:28:51,154 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83239324] [2020-12-23 00:28:51,154 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:28:51,308 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-23 00:28:51,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:28:51,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 00:28:51,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:28:51,578 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 00:28:52,109 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-23 00:28:52,110 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:28:52,110 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 20 [2020-12-23 00:28:52,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068734040] [2020-12-23 00:28:52,151 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 00:28:52,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:28:52,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 00:28:52,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=319, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:28:52,152 INFO L87 Difference]: Start difference. First operand 1419 states and 1776 transitions. Second operand 20 states. [2020-12-23 00:28:54,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:28:54,575 INFO L93 Difference]: Finished difference Result 2010 states and 2508 transitions. [2020-12-23 00:28:54,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:28:54,577 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-12-23 00:28:54,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:28:54,585 INFO L225 Difference]: With dead ends: 2010 [2020-12-23 00:28:54,585 INFO L226 Difference]: Without dead ends: 1994 [2020-12-23 00:28:54,586 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 40 SyntacticMatches, 7 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2020-12-23 00:28:54,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1994 states. [2020-12-23 00:28:54,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1994 to 1495. [2020-12-23 00:28:54,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1495 states. [2020-12-23 00:28:54,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1495 states to 1495 states and 1876 transitions. [2020-12-23 00:28:54,874 INFO L78 Accepts]: Start accepts. Automaton has 1495 states and 1876 transitions. Word has length 47 [2020-12-23 00:28:54,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:28:54,874 INFO L481 AbstractCegarLoop]: Abstraction has 1495 states and 1876 transitions. [2020-12-23 00:28:54,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 00:28:54,875 INFO L276 IsEmpty]: Start isEmpty. Operand 1495 states and 1876 transitions. [2020-12-23 00:28:54,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:28:54,878 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:28:54,879 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:28:55,093 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:28:55,094 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:28:55,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:28:55,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1746524633, now seen corresponding path program 7 times [2020-12-23 00:28:55,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:28:55,095 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932116449] [2020-12-23 00:28:55,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:28:55,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:28:55,928 WARN L197 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-12-23 00:28:56,171 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-23 00:28:56,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932116449] [2020-12-23 00:28:56,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528038939] [2020-12-23 00:28:56,172 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:28:56,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:28:56,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 00:28:56,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:28:56,737 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:28:56,752 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:28:57,239 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-23 00:28:57,240 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:28:57,240 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 17 [2020-12-23 00:28:57,240 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944749399] [2020-12-23 00:28:57,241 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 00:28:57,241 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:28:57,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 00:28:57,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:28:57,242 INFO L87 Difference]: Start difference. First operand 1495 states and 1876 transitions. Second operand 17 states. [2020-12-23 00:28:59,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:28:59,720 INFO L93 Difference]: Finished difference Result 1911 states and 2382 transitions. [2020-12-23 00:28:59,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 00:28:59,722 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 47 [2020-12-23 00:28:59,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:28:59,730 INFO L225 Difference]: With dead ends: 1911 [2020-12-23 00:28:59,730 INFO L226 Difference]: Without dead ends: 1906 [2020-12-23 00:28:59,731 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2020-12-23 00:28:59,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1906 states. [2020-12-23 00:29:00,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1906 to 1588. [2020-12-23 00:29:00,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1588 states. [2020-12-23 00:29:00,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1588 states to 1588 states and 1999 transitions. [2020-12-23 00:29:00,041 INFO L78 Accepts]: Start accepts. Automaton has 1588 states and 1999 transitions. Word has length 47 [2020-12-23 00:29:00,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:29:00,041 INFO L481 AbstractCegarLoop]: Abstraction has 1588 states and 1999 transitions. [2020-12-23 00:29:00,041 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 00:29:00,041 INFO L276 IsEmpty]: Start isEmpty. Operand 1588 states and 1999 transitions. [2020-12-23 00:29:00,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:29:00,044 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:29:00,044 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:29:00,257 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2020-12-23 00:29:00,258 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:29:00,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:29:00,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1048777817, now seen corresponding path program 8 times [2020-12-23 00:29:00,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:29:00,259 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856169848] [2020-12-23 00:29:00,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:29:00,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:29:00,947 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-23 00:29:00,947 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856169848] [2020-12-23 00:29:00,948 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069221674] [2020-12-23 00:29:00,948 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:29:01,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:29:01,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:29:01,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 00:29:01,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:29:01,677 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-23 00:29:01,677 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:29:01,677 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 17 [2020-12-23 00:29:01,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367065058] [2020-12-23 00:29:01,678 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 00:29:01,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:29:01,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 00:29:01,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:29:01,679 INFO L87 Difference]: Start difference. First operand 1588 states and 1999 transitions. Second operand 17 states. [2020-12-23 00:29:04,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:29:04,385 INFO L93 Difference]: Finished difference Result 2262 states and 2830 transitions. [2020-12-23 00:29:04,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 00:29:04,388 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 47 [2020-12-23 00:29:04,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:29:04,395 INFO L225 Difference]: With dead ends: 2262 [2020-12-23 00:29:04,396 INFO L226 Difference]: Without dead ends: 2246 [2020-12-23 00:29:04,396 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2020-12-23 00:29:04,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2246 states. [2020-12-23 00:29:04,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2246 to 1682. [2020-12-23 00:29:04,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1682 states. [2020-12-23 00:29:04,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1682 states to 1682 states and 2118 transitions. [2020-12-23 00:29:04,746 INFO L78 Accepts]: Start accepts. Automaton has 1682 states and 2118 transitions. Word has length 47 [2020-12-23 00:29:04,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:29:04,746 INFO L481 AbstractCegarLoop]: Abstraction has 1682 states and 2118 transitions. [2020-12-23 00:29:04,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 00:29:04,746 INFO L276 IsEmpty]: Start isEmpty. Operand 1682 states and 2118 transitions. [2020-12-23 00:29:04,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 00:29:04,749 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:29:04,750 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:29:04,950 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:29:04,951 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:29:04,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:29:04,951 INFO L82 PathProgramCache]: Analyzing trace with hash -641724695, now seen corresponding path program 2 times [2020-12-23 00:29:04,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:29:04,952 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389975396] [2020-12-23 00:29:04,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:29:05,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:29:05,299 WARN L197 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 7 [2020-12-23 00:29:06,393 WARN L197 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 24 [2020-12-23 00:29:06,532 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 00:29:06,532 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389975396] [2020-12-23 00:29:06,532 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707885430] [2020-12-23 00:29:06,532 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:29:06,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:29:06,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:29:06,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 00:29:06,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:29:06,990 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 00:29:07,253 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-23 00:29:07,263 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 00:29:08,002 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 00:29:08,003 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:29:08,003 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 23 [2020-12-23 00:29:08,003 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875572797] [2020-12-23 00:29:08,003 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-23 00:29:08,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:29:08,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-23 00:29:08,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-12-23 00:29:08,004 INFO L87 Difference]: Start difference. First operand 1682 states and 2118 transitions. Second operand 23 states. [2020-12-23 00:29:12,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:29:12,250 INFO L93 Difference]: Finished difference Result 2512 states and 3156 transitions. [2020-12-23 00:29:12,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 00:29:12,252 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 47 [2020-12-23 00:29:12,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:29:12,264 INFO L225 Difference]: With dead ends: 2512 [2020-12-23 00:29:12,264 INFO L226 Difference]: Without dead ends: 2507 [2020-12-23 00:29:12,266 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 39 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=112, Invalid=590, Unknown=0, NotChecked=0, Total=702 [2020-12-23 00:29:12,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2507 states. [2020-12-23 00:29:12,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2507 to 1812. [2020-12-23 00:29:12,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1812 states. [2020-12-23 00:29:12,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1812 states to 1812 states and 2296 transitions. [2020-12-23 00:29:12,634 INFO L78 Accepts]: Start accepts. Automaton has 1812 states and 2296 transitions. Word has length 47 [2020-12-23 00:29:12,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:29:12,635 INFO L481 AbstractCegarLoop]: Abstraction has 1812 states and 2296 transitions. [2020-12-23 00:29:12,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-23 00:29:12,635 INFO L276 IsEmpty]: Start isEmpty. Operand 1812 states and 2296 transitions. [2020-12-23 00:29:12,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-23 00:29:12,639 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:29:12,639 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:29:12,839 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2020-12-23 00:29:12,840 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:29:12,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:29:12,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1958354755, now seen corresponding path program 4 times [2020-12-23 00:29:12,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:29:12,841 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579295307] [2020-12-23 00:29:12,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:29:12,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:29:13,096 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-12-23 00:29:13,097 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579295307] [2020-12-23 00:29:13,097 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145941811] [2020-12-23 00:29:13,097 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:29:13,190 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:29:13,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:29:13,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 00:29:13,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:29:13,586 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-12-23 00:29:13,587 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:29:13,587 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-12-23 00:29:13,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559639711] [2020-12-23 00:29:13,588 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 00:29:13,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:29:13,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 00:29:13,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2020-12-23 00:29:13,589 INFO L87 Difference]: Start difference. First operand 1812 states and 2296 transitions. Second operand 14 states. [2020-12-23 00:29:15,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:29:15,143 INFO L93 Difference]: Finished difference Result 2123 states and 2689 transitions. [2020-12-23 00:29:15,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-23 00:29:15,147 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2020-12-23 00:29:15,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:29:15,155 INFO L225 Difference]: With dead ends: 2123 [2020-12-23 00:29:15,155 INFO L226 Difference]: Without dead ends: 1941 [2020-12-23 00:29:15,156 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=209, Invalid=603, Unknown=0, NotChecked=0, Total=812 [2020-12-23 00:29:15,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1941 states. [2020-12-23 00:29:15,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1941 to 1682. [2020-12-23 00:29:15,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1682 states. [2020-12-23 00:29:15,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1682 states to 1682 states and 2108 transitions. [2020-12-23 00:29:15,511 INFO L78 Accepts]: Start accepts. Automaton has 1682 states and 2108 transitions. Word has length 49 [2020-12-23 00:29:15,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:29:15,511 INFO L481 AbstractCegarLoop]: Abstraction has 1682 states and 2108 transitions. [2020-12-23 00:29:15,511 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 00:29:15,511 INFO L276 IsEmpty]: Start isEmpty. Operand 1682 states and 2108 transitions. [2020-12-23 00:29:15,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-23 00:29:15,514 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:29:15,514 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:29:15,715 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:29:15,716 INFO L429 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:29:15,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:29:15,716 INFO L82 PathProgramCache]: Analyzing trace with hash -1757879955, now seen corresponding path program 8 times [2020-12-23 00:29:15,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:29:15,717 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173811164] [2020-12-23 00:29:15,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:29:15,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:29:16,012 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 15 proven. 19 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 00:29:16,013 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173811164] [2020-12-23 00:29:16,013 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1171666117] [2020-12-23 00:29:16,014 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:29:16,107 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:29:16,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:29:16,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 00:29:16,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:29:16,616 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 22 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 00:29:16,617 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:29:16,617 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2020-12-23 00:29:16,617 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813678886] [2020-12-23 00:29:16,618 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 00:29:16,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:29:16,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 00:29:16,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:29:16,618 INFO L87 Difference]: Start difference. First operand 1682 states and 2108 transitions. Second operand 16 states. [2020-12-23 00:29:17,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:29:17,834 INFO L93 Difference]: Finished difference Result 2010 states and 2516 transitions. [2020-12-23 00:29:17,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 00:29:17,838 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2020-12-23 00:29:17,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:29:17,845 INFO L225 Difference]: With dead ends: 2010 [2020-12-23 00:29:17,845 INFO L226 Difference]: Without dead ends: 1719 [2020-12-23 00:29:17,846 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:29:17,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2020-12-23 00:29:18,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1459. [2020-12-23 00:29:18,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1459 states. [2020-12-23 00:29:18,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1459 states to 1459 states and 1863 transitions. [2020-12-23 00:29:18,143 INFO L78 Accepts]: Start accepts. Automaton has 1459 states and 1863 transitions. Word has length 50 [2020-12-23 00:29:18,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:29:18,143 INFO L481 AbstractCegarLoop]: Abstraction has 1459 states and 1863 transitions. [2020-12-23 00:29:18,143 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 00:29:18,143 INFO L276 IsEmpty]: Start isEmpty. Operand 1459 states and 1863 transitions. [2020-12-23 00:29:18,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-23 00:29:18,145 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:29:18,146 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:29:18,346 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2020-12-23 00:29:18,347 INFO L429 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:29:18,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:29:18,348 INFO L82 PathProgramCache]: Analyzing trace with hash 1265236080, now seen corresponding path program 9 times [2020-12-23 00:29:18,348 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:29:18,348 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992109314] [2020-12-23 00:29:18,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:29:18,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:29:18,643 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 5 proven. 29 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 00:29:18,644 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992109314] [2020-12-23 00:29:18,644 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790454841] [2020-12-23 00:29:18,644 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:29:18,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-23 00:29:18,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:29:18,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 00:29:18,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:29:19,382 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 12 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-12-23 00:29:19,383 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:29:19,383 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 15 [2020-12-23 00:29:19,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947497404] [2020-12-23 00:29:19,384 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 00:29:19,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:29:19,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 00:29:19,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:29:19,385 INFO L87 Difference]: Start difference. First operand 1459 states and 1863 transitions. Second operand 15 states. [2020-12-23 00:29:20,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:29:20,930 INFO L93 Difference]: Finished difference Result 1636 states and 2100 transitions. [2020-12-23 00:29:20,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:29:20,933 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 50 [2020-12-23 00:29:20,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:29:20,938 INFO L225 Difference]: With dead ends: 1636 [2020-12-23 00:29:20,939 INFO L226 Difference]: Without dead ends: 1403 [2020-12-23 00:29:20,940 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=138, Invalid=462, Unknown=0, NotChecked=0, Total=600 [2020-12-23 00:29:20,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1403 states. [2020-12-23 00:29:21,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1403 to 890. [2020-12-23 00:29:21,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 890 states. [2020-12-23 00:29:21,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 890 states to 890 states and 1169 transitions. [2020-12-23 00:29:21,161 INFO L78 Accepts]: Start accepts. Automaton has 890 states and 1169 transitions. Word has length 50 [2020-12-23 00:29:21,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:29:21,161 INFO L481 AbstractCegarLoop]: Abstraction has 890 states and 1169 transitions. [2020-12-23 00:29:21,161 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 00:29:21,161 INFO L276 IsEmpty]: Start isEmpty. Operand 890 states and 1169 transitions. [2020-12-23 00:29:21,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-12-23 00:29:21,164 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:29:21,164 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:29:21,370 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2020-12-23 00:29:21,371 INFO L429 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:29:21,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:29:21,372 INFO L82 PathProgramCache]: Analyzing trace with hash 660306497, now seen corresponding path program 10 times [2020-12-23 00:29:21,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:29:21,372 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943311543] [2020-12-23 00:29:21,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:29:21,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:29:21,773 WARN L197 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 9 [2020-12-23 00:29:22,452 WARN L197 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 16 [2020-12-23 00:29:23,255 WARN L197 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 24 [2020-12-23 00:29:23,437 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 00:29:23,438 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943311543] [2020-12-23 00:29:23,438 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940203158] [2020-12-23 00:29:23,438 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:29:23,642 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:29:23,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:29:23,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 43 conjunts are in the unsatisfiable core [2020-12-23 00:29:23,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:29:24,690 WARN L197 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 11 [2020-12-23 00:29:24,852 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 00:29:24,853 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:29:24,853 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 26 [2020-12-23 00:29:24,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927749204] [2020-12-23 00:29:24,854 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-23 00:29:24,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:29:24,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-23 00:29:24,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2020-12-23 00:29:24,855 INFO L87 Difference]: Start difference. First operand 890 states and 1169 transitions. Second operand 26 states. [2020-12-23 00:29:28,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:29:28,484 INFO L93 Difference]: Finished difference Result 1394 states and 1801 transitions. [2020-12-23 00:29:28,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-23 00:29:28,489 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 58 [2020-12-23 00:29:28,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:29:28,493 INFO L225 Difference]: With dead ends: 1394 [2020-12-23 00:29:28,493 INFO L226 Difference]: Without dead ends: 1389 [2020-12-23 00:29:28,494 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2020-12-23 00:29:28,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1389 states. [2020-12-23 00:29:28,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1389 to 999. [2020-12-23 00:29:28,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 999 states. [2020-12-23 00:29:28,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 999 states to 999 states and 1323 transitions. [2020-12-23 00:29:28,749 INFO L78 Accepts]: Start accepts. Automaton has 999 states and 1323 transitions. Word has length 58 [2020-12-23 00:29:28,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:29:28,750 INFO L481 AbstractCegarLoop]: Abstraction has 999 states and 1323 transitions. [2020-12-23 00:29:28,750 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-23 00:29:28,750 INFO L276 IsEmpty]: Start isEmpty. Operand 999 states and 1323 transitions. [2020-12-23 00:29:28,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-12-23 00:29:28,752 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:29:28,752 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:29:28,966 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2020-12-23 00:29:28,967 INFO L429 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:29:28,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:29:28,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1859653437, now seen corresponding path program 5 times [2020-12-23 00:29:28,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:29:28,968 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483902704] [2020-12-23 00:29:28,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:29:29,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:29:29,573 WARN L197 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 18 [2020-12-23 00:29:29,778 WARN L197 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 26 [2020-12-23 00:29:30,034 WARN L197 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 28 [2020-12-23 00:29:30,221 WARN L197 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 24 [2020-12-23 00:29:30,500 WARN L197 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 20 [2020-12-23 00:29:30,668 WARN L197 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-12-23 00:29:30,853 WARN L197 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 25 [2020-12-23 00:29:31,096 WARN L197 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 29 [2020-12-23 00:29:32,108 WARN L197 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 5 [2020-12-23 00:29:32,126 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 7 proven. 63 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-23 00:29:32,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483902704] [2020-12-23 00:29:32,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869491544] [2020-12-23 00:29:32,127 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:29:32,230 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-12-23 00:29:32,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:29:32,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 38 conjunts are in the unsatisfiable core [2020-12-23 00:29:32,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:29:32,594 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2020-12-23 00:29:32,597 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:29:32,610 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:29:32,611 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:29:32,612 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:9 [2020-12-23 00:29:33,316 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2020-12-23 00:29:33,321 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 00:29:33,349 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:29:33,352 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:29:33,353 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:21 [2020-12-23 00:29:34,088 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 00:29:34,089 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2020-12-23 00:29:34,095 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-23 00:29:34,160 INFO L625 ElimStorePlain]: treesize reduction 11, result has 57.7 percent of original size [2020-12-23 00:29:34,168 INFO L547 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 00:29:34,168 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:35, output treesize:5 [2020-12-23 00:29:34,276 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 19 proven. 19 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2020-12-23 00:29:34,276 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:29:34,277 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 15] total 35 [2020-12-23 00:29:34,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955533433] [2020-12-23 00:29:34,278 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-12-23 00:29:34,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:29:34,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-12-23 00:29:34,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1084, Unknown=0, NotChecked=0, Total=1190 [2020-12-23 00:29:34,279 INFO L87 Difference]: Start difference. First operand 999 states and 1323 transitions. Second operand 35 states. [2020-12-23 00:29:37,075 WARN L197 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 31 [2020-12-23 00:29:37,532 WARN L197 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 32 [2020-12-23 00:29:37,873 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-12-23 00:29:38,259 WARN L197 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 33 [2020-12-23 00:29:38,663 WARN L197 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2020-12-23 00:29:39,152 WARN L197 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 37 [2020-12-23 00:29:39,646 WARN L197 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-12-23 00:29:40,227 WARN L197 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2020-12-23 00:29:40,680 WARN L197 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2020-12-23 00:29:41,087 WARN L197 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 27 [2020-12-23 00:29:43,274 WARN L197 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 35 [2020-12-23 00:29:43,576 WARN L197 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 33 [2020-12-23 00:29:43,977 WARN L197 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 41