/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/loop-crafted/simple_array_index_value_3.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 06:52:42,652 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 06:52:42,655 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 06:52:42,691 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 06:52:42,692 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 06:52:42,694 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 06:52:42,695 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 06:52:42,698 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 06:52:42,700 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 06:52:42,701 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 06:52:42,703 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 06:52:42,707 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 06:52:42,708 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 06:52:42,711 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 06:52:42,712 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 06:52:42,715 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 06:52:42,735 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 06:52:42,742 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 06:52:42,746 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 06:52:42,754 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 06:52:42,759 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 06:52:42,761 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 06:52:42,763 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 06:52:42,765 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 06:52:42,773 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 06:52:42,797 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 06:52:42,799 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 06:52:42,799 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 06:52:42,800 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 06:52:42,847 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 06:52:42,848 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 06:52:42,849 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 06:52:42,850 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 06:52:42,850 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 06:52:42,850 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 06:52:42,850 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 06:52:42,851 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 06:52:42,851 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 06:52:42,851 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 06:52:42,851 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 06:52:42,852 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 06:52:42,852 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 06:52:42,852 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 06:52:42,852 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 06:52:42,853 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 06:52:42,853 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 06:52:42,853 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 06:52:42,853 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 06:52:42,854 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 06:52:42,854 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 06:52:42,854 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 06:52:42,854 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 06:52:42,855 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 06:52:42,855 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 06:52:42,855 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 06:52:43,220 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 06:52:43,267 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 06:52:43,271 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 06:52:43,272 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 06:52:43,273 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 06:52:43,274 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-crafted/simple_array_index_value_3.i [2020-12-23 06:52:43,362 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/0f638735f/dabe67b898ce4bb4829eaaff77541678/FLAGe062dc943 [2020-12-23 06:52:44,083 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 06:52:44,084 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-crafted/simple_array_index_value_3.i [2020-12-23 06:52:44,091 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/0f638735f/dabe67b898ce4bb4829eaaff77541678/FLAGe062dc943 [2020-12-23 06:52:44,434 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/0f638735f/dabe67b898ce4bb4829eaaff77541678 [2020-12-23 06:52:44,438 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 06:52:44,440 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 06:52:44,444 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 06:52:44,444 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 06:52:44,451 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 06:52:44,453 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,455 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@448ebb08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44, skipping insertion in model container [2020-12-23 06:52:44,455 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,465 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 06:52:44,484 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 06:52:44,678 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/loop-crafted/simple_array_index_value_3.i[920,933] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~array~0,],[BinaryExpression[ARITHMOD,IdentifierExpression[~index~0,],IntegerLiteral[4294967296]]]] left hand side expression in assignment: lhs: VariableLHS[~index~0,] left hand side expression in assignment: lhs: VariableLHS[~tmp~0,] left hand side expression in assignment: lhs: VariableLHS[~index~0,] [2020-12-23 06:52:44,696 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:52:44,705 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 06:52:44,720 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/loop-crafted/simple_array_index_value_3.i[920,933] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#array~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#array~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],BinaryExpression[ARITHMOD,IdentifierExpression[~index~0,],IntegerLiteral[4294967296]]]]]] left hand side expression in assignment: lhs: VariableLHS[~index~0,] left hand side expression in assignment: lhs: VariableLHS[~tmp~0,] left hand side expression in assignment: lhs: VariableLHS[~index~0,] [2020-12-23 06:52:44,727 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:52:44,744 INFO L208 MainTranslator]: Completed translation [2020-12-23 06:52:44,744 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44 WrapperNode [2020-12-23 06:52:44,744 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 06:52:44,746 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 06:52:44,746 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 06:52:44,746 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 06:52:44,755 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,764 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,784 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 06:52:44,785 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 06:52:44,785 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 06:52:44,785 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 06:52:44,794 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,795 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,797 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,797 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,802 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,807 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,809 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (1/1) ... [2020-12-23 06:52:44,811 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 06:52:44,812 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 06:52:44,812 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 06:52:44,812 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 06:52:44,813 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (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 06:52:44,929 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 06:52:44,929 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 06:52:44,929 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 06:52:44,929 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 06:52:44,930 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 06:52:44,930 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 06:52:44,930 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 06:52:45,288 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 06:52:45,289 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-23 06:52:45,291 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:52:45 BoogieIcfgContainer [2020-12-23 06:52:45,291 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 06:52:45,293 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 06:52:45,294 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 06:52:45,297 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 06:52:45,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 06:52:44" (1/3) ... [2020-12-23 06:52:45,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@585622a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:52:45, skipping insertion in model container [2020-12-23 06:52:45,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:44" (2/3) ... [2020-12-23 06:52:45,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@585622a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:52:45, skipping insertion in model container [2020-12-23 06:52:45,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:52:45" (3/3) ... [2020-12-23 06:52:45,302 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_3.i [2020-12-23 06:52:45,311 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 06:52:45,319 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 06:52:45,350 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 06:52:45,441 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 06:52:45,442 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 06:52:45,442 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 06:52:45,442 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 06:52:45,442 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 06:52:45,442 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 06:52:45,442 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 06:52:45,443 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 06:52:45,481 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-12-23 06:52:45,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 06:52:45,494 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:45,498 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:45,498 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:45,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:45,514 INFO L82 PathProgramCache]: Analyzing trace with hash -1156778892, now seen corresponding path program 1 times [2020-12-23 06:52:45,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:45,540 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177204795] [2020-12-23 06:52:45,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:45,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:45,777 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 06:52:45,778 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177204795] [2020-12-23 06:52:45,779 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:52:45,779 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 06:52:45,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172422487] [2020-12-23 06:52:45,786 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 06:52:45,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:45,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 06:52:45,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-23 06:52:45,810 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 4 states. [2020-12-23 06:52:45,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:45,894 INFO L93 Difference]: Finished difference Result 40 states and 51 transitions. [2020-12-23 06:52:45,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 06:52:45,896 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-12-23 06:52:45,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:45,908 INFO L225 Difference]: With dead ends: 40 [2020-12-23 06:52:45,909 INFO L226 Difference]: Without dead ends: 19 [2020-12-23 06:52:45,913 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 06:52:45,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-23 06:52:45,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2020-12-23 06:52:45,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-23 06:52:45,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-12-23 06:52:45,954 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2020-12-23 06:52:45,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:45,954 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-12-23 06:52:45,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 06:52:45,955 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-12-23 06:52:45,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 06:52:45,956 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:45,956 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:45,957 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 06:52:45,958 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:45,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:45,964 INFO L82 PathProgramCache]: Analyzing trace with hash -1156719310, now seen corresponding path program 1 times [2020-12-23 06:52:45,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:45,964 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11956290] [2020-12-23 06:52:45,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:46,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:46,065 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 06:52:46,066 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11956290] [2020-12-23 06:52:46,066 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:52:46,066 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 06:52:46,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894284269] [2020-12-23 06:52:46,068 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 06:52:46,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:46,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 06:52:46,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 06:52:46,070 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-12-23 06:52:46,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:46,107 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-12-23 06:52:46,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 06:52:46,108 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-23 06:52:46,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:46,109 INFO L225 Difference]: With dead ends: 36 [2020-12-23 06:52:46,109 INFO L226 Difference]: Without dead ends: 25 [2020-12-23 06:52:46,110 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 06:52:46,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-23 06:52:46,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 15. [2020-12-23 06:52:46,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-23 06:52:46,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-23 06:52:46,115 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-12-23 06:52:46,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:46,116 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-23 06:52:46,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 06:52:46,116 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-23 06:52:46,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 06:52:46,117 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:46,117 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:46,117 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-23 06:52:46,117 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:46,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:46,118 INFO L82 PathProgramCache]: Analyzing trace with hash 723292333, now seen corresponding path program 1 times [2020-12-23 06:52:46,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:46,119 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337964740] [2020-12-23 06:52:46,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:46,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:46,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:46,219 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337964740] [2020-12-23 06:52:46,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914715129] [2020-12-23 06:52:46,220 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 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 06:52:46,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:46,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 06:52:46,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:46,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:46,353 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:46,353 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 06:52:46,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159647770] [2020-12-23 06:52:46,354 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 06:52:46,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:46,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 06:52:46,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 06:52:46,355 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 5 states. [2020-12-23 06:52:46,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:46,422 INFO L93 Difference]: Finished difference Result 47 states and 53 transitions. [2020-12-23 06:52:46,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 06:52:46,423 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-23 06:52:46,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:46,424 INFO L225 Difference]: With dead ends: 47 [2020-12-23 06:52:46,424 INFO L226 Difference]: Without dead ends: 36 [2020-12-23 06:52:46,425 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 06:52:46,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-23 06:52:46,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 16. [2020-12-23 06:52:46,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-23 06:52:46,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-23 06:52:46,433 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 10 [2020-12-23 06:52:46,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:46,434 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-23 06:52:46,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 06:52:46,434 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-23 06:52:46,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 06:52:46,435 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:46,435 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:46,649 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-23 06:52:46,650 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:46,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:46,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1125888878, now seen corresponding path program 2 times [2020-12-23 06:52:46,652 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:46,653 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246632775] [2020-12-23 06:52:46,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:46,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:46,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:46,766 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246632775] [2020-12-23 06:52:46,767 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273961719] [2020-12-23 06:52:46,767 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 06:52:46,825 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:52:46,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:46,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 06:52:46,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:46,890 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:46,891 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:46,891 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 06:52:46,891 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953990548] [2020-12-23 06:52:46,892 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 06:52:46,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:46,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 06:52:46,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:52:46,893 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-12-23 06:52:46,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:46,960 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2020-12-23 06:52:46,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 06:52:46,961 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-12-23 06:52:46,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:46,962 INFO L225 Difference]: With dead ends: 58 [2020-12-23 06:52:46,962 INFO L226 Difference]: Without dead ends: 47 [2020-12-23 06:52:46,963 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:52:46,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-12-23 06:52:46,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 17. [2020-12-23 06:52:46,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 06:52:46,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-23 06:52:46,969 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2020-12-23 06:52:46,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:46,969 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-23 06:52:46,969 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 06:52:46,969 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-23 06:52:46,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 06:52:46,970 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:46,970 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:47,184 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:47,185 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:47,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:47,186 INFO L82 PathProgramCache]: Analyzing trace with hash 1679035725, now seen corresponding path program 3 times [2020-12-23 06:52:47,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:47,187 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971675824] [2020-12-23 06:52:47,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:47,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:47,273 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:47,274 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971675824] [2020-12-23 06:52:47,274 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886471673] [2020-12-23 06:52:47,274 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 06:52:47,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-23 06:52:47,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:47,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 06:52:47,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:47,401 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:47,401 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:47,402 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 06:52:47,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963554582] [2020-12-23 06:52:47,402 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 06:52:47,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:47,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 06:52:47,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-23 06:52:47,404 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 7 states. [2020-12-23 06:52:47,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:47,524 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2020-12-23 06:52:47,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 06:52:47,524 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-12-23 06:52:47,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:47,525 INFO L225 Difference]: With dead ends: 69 [2020-12-23 06:52:47,526 INFO L226 Difference]: Without dead ends: 58 [2020-12-23 06:52:47,526 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-23 06:52:47,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-23 06:52:47,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 18. [2020-12-23 06:52:47,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-23 06:52:47,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-23 06:52:47,532 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2020-12-23 06:52:47,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:47,532 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-23 06:52:47,532 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 06:52:47,533 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-23 06:52:47,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-23 06:52:47,533 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:47,533 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:47,747 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:47,748 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:47,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:47,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1562614798, now seen corresponding path program 4 times [2020-12-23 06:52:47,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:47,750 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172049960] [2020-12-23 06:52:47,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:47,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:47,905 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:47,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172049960] [2020-12-23 06:52:47,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761446024] [2020-12-23 06:52:47,906 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:47,955 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:52:47,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:47,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 06:52:47,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:48,014 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:48,014 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:48,014 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 06:52:48,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21435674] [2020-12-23 06:52:48,015 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 06:52:48,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:48,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 06:52:48,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:52:48,017 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 8 states. [2020-12-23 06:52:48,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:48,148 INFO L93 Difference]: Finished difference Result 80 states and 89 transitions. [2020-12-23 06:52:48,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 06:52:48,149 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2020-12-23 06:52:48,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:48,150 INFO L225 Difference]: With dead ends: 80 [2020-12-23 06:52:48,150 INFO L226 Difference]: Without dead ends: 69 [2020-12-23 06:52:48,151 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:52:48,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-12-23 06:52:48,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 19. [2020-12-23 06:52:48,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-23 06:52:48,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-12-23 06:52:48,157 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2020-12-23 06:52:48,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:48,157 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-12-23 06:52:48,157 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 06:52:48,157 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-12-23 06:52:48,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-23 06:52:48,158 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:48,158 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:48,372 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:48,373 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:48,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:48,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1025434093, now seen corresponding path program 5 times [2020-12-23 06:52:48,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:48,376 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409371265] [2020-12-23 06:52:48,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:48,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:48,537 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:48,537 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409371265] [2020-12-23 06:52:48,538 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49767623] [2020-12-23 06:52:48,538 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:48,701 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-23 06:52:48,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:48,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-23 06:52:48,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:48,750 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:48,751 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:48,751 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 06:52:48,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360280883] [2020-12-23 06:52:48,752 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 06:52:48,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:48,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 06:52:48,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-12-23 06:52:48,753 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 9 states. [2020-12-23 06:52:48,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:48,914 INFO L93 Difference]: Finished difference Result 91 states and 101 transitions. [2020-12-23 06:52:48,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 06:52:48,915 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 14 [2020-12-23 06:52:48,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:48,918 INFO L225 Difference]: With dead ends: 91 [2020-12-23 06:52:48,918 INFO L226 Difference]: Without dead ends: 80 [2020-12-23 06:52:48,919 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-12-23 06:52:48,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-23 06:52:48,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 20. [2020-12-23 06:52:48,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-23 06:52:48,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-23 06:52:48,926 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 14 [2020-12-23 06:52:48,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:48,926 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-23 06:52:48,926 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 06:52:48,926 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-23 06:52:48,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 06:52:48,927 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:48,927 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:49,139 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-23 06:52:49,140 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:49,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:49,141 INFO L82 PathProgramCache]: Analyzing trace with hash -349428910, now seen corresponding path program 6 times [2020-12-23 06:52:49,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:49,142 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1763212873] [2020-12-23 06:52:49,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:49,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:49,282 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:49,283 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1763212873] [2020-12-23 06:52:49,283 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833294289] [2020-12-23 06:52:49,283 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:49,368 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-23 06:52:49,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:49,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-23 06:52:49,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:49,450 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:49,451 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:49,451 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-23 06:52:49,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453732767] [2020-12-23 06:52:49,452 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 06:52:49,457 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:49,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 06:52:49,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-12-23 06:52:49,458 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 10 states. [2020-12-23 06:52:49,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:49,686 INFO L93 Difference]: Finished difference Result 102 states and 113 transitions. [2020-12-23 06:52:49,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 06:52:49,687 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2020-12-23 06:52:49,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:49,688 INFO L225 Difference]: With dead ends: 102 [2020-12-23 06:52:49,688 INFO L226 Difference]: Without dead ends: 91 [2020-12-23 06:52:49,689 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-12-23 06:52:49,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-23 06:52:49,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 21. [2020-12-23 06:52:49,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-23 06:52:49,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-12-23 06:52:49,694 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2020-12-23 06:52:49,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:49,695 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-12-23 06:52:49,695 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 06:52:49,695 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-12-23 06:52:49,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 06:52:49,696 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:49,696 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:49,906 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:49,907 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:49,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:49,908 INFO L82 PathProgramCache]: Analyzing trace with hash -20509043, now seen corresponding path program 7 times [2020-12-23 06:52:49,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:49,910 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031022982] [2020-12-23 06:52:49,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:49,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:50,097 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:50,097 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031022982] [2020-12-23 06:52:50,097 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1544143091] [2020-12-23 06:52:50,098 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:50,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:50,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-23 06:52:50,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:50,240 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:50,240 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:50,241 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-23 06:52:50,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163269444] [2020-12-23 06:52:50,241 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 06:52:50,241 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:50,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 06:52:50,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-12-23 06:52:50,242 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 11 states. [2020-12-23 06:52:50,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:50,513 INFO L93 Difference]: Finished difference Result 113 states and 125 transitions. [2020-12-23 06:52:50,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 06:52:50,514 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2020-12-23 06:52:50,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:50,515 INFO L225 Difference]: With dead ends: 113 [2020-12-23 06:52:50,515 INFO L226 Difference]: Without dead ends: 102 [2020-12-23 06:52:50,515 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 12 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-12-23 06:52:50,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-12-23 06:52:50,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 22. [2020-12-23 06:52:50,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-23 06:52:50,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-12-23 06:52:50,521 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 16 [2020-12-23 06:52:50,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:50,522 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-12-23 06:52:50,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 06:52:50,522 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-12-23 06:52:50,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-23 06:52:50,523 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:50,523 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:50,737 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:50,738 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:50,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:50,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1586072242, now seen corresponding path program 8 times [2020-12-23 06:52:50,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:50,741 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832048420] [2020-12-23 06:52:50,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:50,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:50,909 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:50,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832048420] [2020-12-23 06:52:50,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917058694] [2020-12-23 06:52:50,910 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:50,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:52:50,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:50,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-23 06:52:50,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:51,097 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:51,097 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:51,098 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 06:52:51,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684745314] [2020-12-23 06:52:51,098 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 06:52:51,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:51,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 06:52:51,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-12-23 06:52:51,100 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 12 states. [2020-12-23 06:52:51,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:51,414 INFO L93 Difference]: Finished difference Result 124 states and 137 transitions. [2020-12-23 06:52:51,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 06:52:51,415 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 17 [2020-12-23 06:52:51,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:51,416 INFO L225 Difference]: With dead ends: 124 [2020-12-23 06:52:51,416 INFO L226 Difference]: Without dead ends: 113 [2020-12-23 06:52:51,418 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 11 SyntacticMatches, 6 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-12-23 06:52:51,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-12-23 06:52:51,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 23. [2020-12-23 06:52:51,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 06:52:51,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-12-23 06:52:51,435 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2020-12-23 06:52:51,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:51,436 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-12-23 06:52:51,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 06:52:51,436 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-12-23 06:52:51,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-23 06:52:51,437 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:51,437 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:51,640 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-23 06:52:51,641 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:51,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:51,642 INFO L82 PathProgramCache]: Analyzing trace with hash -149515475, now seen corresponding path program 9 times [2020-12-23 06:52:51,642 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:51,642 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659048186] [2020-12-23 06:52:51,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:51,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:51,832 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:51,833 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659048186] [2020-12-23 06:52:51,833 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498682203] [2020-12-23 06:52:51,833 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:52,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-23 06:52:52,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:52,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-23 06:52:52,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:52,369 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:52,369 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:52,369 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-23 06:52:52,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489773474] [2020-12-23 06:52:52,372 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 06:52:52,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:52,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 06:52:52,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-12-23 06:52:52,374 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 13 states. [2020-12-23 06:52:52,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:52,753 INFO L93 Difference]: Finished difference Result 135 states and 149 transitions. [2020-12-23 06:52:52,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 06:52:52,754 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 18 [2020-12-23 06:52:52,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:52,755 INFO L225 Difference]: With dead ends: 135 [2020-12-23 06:52:52,755 INFO L226 Difference]: Without dead ends: 124 [2020-12-23 06:52:52,755 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-12-23 06:52:52,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-12-23 06:52:52,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 24. [2020-12-23 06:52:52,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-23 06:52:52,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-12-23 06:52:52,761 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 18 [2020-12-23 06:52:52,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:52,761 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-12-23 06:52:52,761 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 06:52:52,761 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-12-23 06:52:52,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-23 06:52:52,762 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:52,762 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:52,965 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:52,968 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:52,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:52,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1881840146, now seen corresponding path program 10 times [2020-12-23 06:52:52,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:52,970 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215288827] [2020-12-23 06:52:52,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:53,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:53,218 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215288827] [2020-12-23 06:52:53,218 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924956189] [2020-12-23 06:52:53,219 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:53,291 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:52:53,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:53,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 29 conjunts are in the unsatisfiable core [2020-12-23 06:52:53,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:53,411 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:53,411 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:53,411 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-23 06:52:53,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099359819] [2020-12-23 06:52:53,412 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 06:52:53,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:53,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 06:52:53,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-12-23 06:52:53,413 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 14 states. [2020-12-23 06:52:53,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:53,838 INFO L93 Difference]: Finished difference Result 146 states and 161 transitions. [2020-12-23 06:52:53,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 06:52:53,839 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 19 [2020-12-23 06:52:53,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:53,840 INFO L225 Difference]: With dead ends: 146 [2020-12-23 06:52:53,840 INFO L226 Difference]: Without dead ends: 135 [2020-12-23 06:52:53,841 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-12-23 06:52:53,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-12-23 06:52:53,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 25. [2020-12-23 06:52:53,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-23 06:52:53,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-12-23 06:52:53,846 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 19 [2020-12-23 06:52:53,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:53,846 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-12-23 06:52:53,846 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 06:52:53,847 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-12-23 06:52:53,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-23 06:52:53,847 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:53,847 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:54,062 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:54,063 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:54,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:54,064 INFO L82 PathProgramCache]: Analyzing trace with hash 429354957, now seen corresponding path program 11 times [2020-12-23 06:52:54,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:54,065 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458078518] [2020-12-23 06:52:54,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:54,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:54,300 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:54,301 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458078518] [2020-12-23 06:52:54,301 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176075537] [2020-12-23 06:52:54,301 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:57,222 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2020-12-23 06:52:57,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:57,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-23 06:52:57,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:57,304 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:57,305 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:57,305 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-23 06:52:57,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700204193] [2020-12-23 06:52:57,309 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 06:52:57,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:57,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 06:52:57,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-12-23 06:52:57,310 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 15 states. [2020-12-23 06:52:57,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:57,805 INFO L93 Difference]: Finished difference Result 157 states and 173 transitions. [2020-12-23 06:52:57,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 06:52:57,806 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 20 [2020-12-23 06:52:57,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:57,807 INFO L225 Difference]: With dead ends: 157 [2020-12-23 06:52:57,807 INFO L226 Difference]: Without dead ends: 146 [2020-12-23 06:52:57,808 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-12-23 06:52:57,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-12-23 06:52:57,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 26. [2020-12-23 06:52:57,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-23 06:52:57,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-12-23 06:52:57,813 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 20 [2020-12-23 06:52:57,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:57,813 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-12-23 06:52:57,814 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 06:52:57,814 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-12-23 06:52:57,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-23 06:52:57,814 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:57,814 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:58,019 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 06:52:58,020 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:58,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:58,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1648012942, now seen corresponding path program 12 times [2020-12-23 06:52:58,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:58,021 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820724704] [2020-12-23 06:52:58,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:58,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:58,298 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:58,298 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820724704] [2020-12-23 06:52:58,298 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115221911] [2020-12-23 06:52:58,298 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:00,126 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 06:53:00,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:00,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-23 06:53:00,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:00,209 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:00,209 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:00,209 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-23 06:53:00,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442285794] [2020-12-23 06:53:00,210 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 06:53:00,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:00,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 06:53:00,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-12-23 06:53:00,211 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 16 states. [2020-12-23 06:53:00,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:00,833 INFO L93 Difference]: Finished difference Result 168 states and 185 transitions. [2020-12-23 06:53:00,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 06:53:00,834 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2020-12-23 06:53:00,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:00,835 INFO L225 Difference]: With dead ends: 168 [2020-12-23 06:53:00,835 INFO L226 Difference]: Without dead ends: 157 [2020-12-23 06:53:00,836 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-12-23 06:53:00,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-12-23 06:53:00,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 27. [2020-12-23 06:53:00,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-23 06:53:00,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-12-23 06:53:00,841 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 21 [2020-12-23 06:53:00,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:00,841 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-12-23 06:53:00,842 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 06:53:00,842 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-12-23 06:53:00,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-23 06:53:00,842 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:00,843 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:01,056 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 06:53:01,057 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:01,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:01,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1621908371, now seen corresponding path program 13 times [2020-12-23 06:53:01,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:01,058 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680743246] [2020-12-23 06:53:01,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:01,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:01,287 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:01,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680743246] [2020-12-23 06:53:01,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308187118] [2020-12-23 06:53:01,288 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:01,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:01,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 06:53:01,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:01,512 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:01,512 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:01,512 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-23 06:53:01,513 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19115956] [2020-12-23 06:53:01,513 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 06:53:01,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:01,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 06:53:01,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-12-23 06:53:01,514 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 17 states. [2020-12-23 06:53:02,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:02,181 INFO L93 Difference]: Finished difference Result 179 states and 197 transitions. [2020-12-23 06:53:02,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 06:53:02,181 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 22 [2020-12-23 06:53:02,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:02,183 INFO L225 Difference]: With dead ends: 179 [2020-12-23 06:53:02,183 INFO L226 Difference]: Without dead ends: 168 [2020-12-23 06:53:02,183 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-12-23 06:53:02,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-12-23 06:53:02,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 28. [2020-12-23 06:53:02,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-23 06:53:02,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-23 06:53:02,189 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 22 [2020-12-23 06:53:02,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:02,189 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-23 06:53:02,189 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 06:53:02,190 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-23 06:53:02,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-23 06:53:02,190 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:02,190 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:02,403 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-23 06:53:02,404 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:02,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:02,404 INFO L82 PathProgramCache]: Analyzing trace with hash -812666670, now seen corresponding path program 14 times [2020-12-23 06:53:02,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:02,405 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303539899] [2020-12-23 06:53:02,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:02,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:02,681 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:02,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303539899] [2020-12-23 06:53:02,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951924320] [2020-12-23 06:53:02,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:02,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:53:02,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:02,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 42 conjunts are in the unsatisfiable core [2020-12-23 06:53:02,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:02,990 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:02,993 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:02,993 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 06:53:02,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800852942] [2020-12-23 06:53:02,994 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 06:53:02,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:02,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 06:53:02,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:53:02,996 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 18 states. [2020-12-23 06:53:03,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:03,747 INFO L93 Difference]: Finished difference Result 190 states and 209 transitions. [2020-12-23 06:53:03,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-23 06:53:03,748 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 23 [2020-12-23 06:53:03,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:03,750 INFO L225 Difference]: With dead ends: 190 [2020-12-23 06:53:03,750 INFO L226 Difference]: Without dead ends: 179 [2020-12-23 06:53:03,750 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 11 SyntacticMatches, 12 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:53:03,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2020-12-23 06:53:03,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 29. [2020-12-23 06:53:03,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-23 06:53:03,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-12-23 06:53:03,756 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 23 [2020-12-23 06:53:03,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:03,757 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-12-23 06:53:03,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 06:53:03,757 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-12-23 06:53:03,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-23 06:53:03,757 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:03,758 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:03,966 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:03,967 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:03,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:03,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1495977715, now seen corresponding path program 15 times [2020-12-23 06:53:03,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:03,968 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777452211] [2020-12-23 06:53:03,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:03,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:04,255 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:04,255 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777452211] [2020-12-23 06:53:04,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019535727] [2020-12-23 06:53:04,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:07,682 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-23 06:53:07,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:07,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 34 conjunts are in the unsatisfiable core [2020-12-23 06:53:07,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:07,785 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:07,785 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:07,785 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-23 06:53:07,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164870895] [2020-12-23 06:53:07,787 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 06:53:07,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:07,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 06:53:07,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-12-23 06:53:07,788 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 19 states. [2020-12-23 06:53:08,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:08,682 INFO L93 Difference]: Finished difference Result 201 states and 221 transitions. [2020-12-23 06:53:08,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 06:53:08,683 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 24 [2020-12-23 06:53:08,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:08,684 INFO L225 Difference]: With dead ends: 201 [2020-12-23 06:53:08,684 INFO L226 Difference]: Without dead ends: 190 [2020-12-23 06:53:08,685 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-12-23 06:53:08,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2020-12-23 06:53:08,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 30. [2020-12-23 06:53:08,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-23 06:53:08,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-12-23 06:53:08,691 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 24 [2020-12-23 06:53:08,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:08,691 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-12-23 06:53:08,691 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 06:53:08,692 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-12-23 06:53:08,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-23 06:53:08,692 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:08,692 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:08,906 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 06:53:08,907 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:08,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:08,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1203783630, now seen corresponding path program 16 times [2020-12-23 06:53:08,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:08,908 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417515790] [2020-12-23 06:53:08,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:08,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:09,245 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:09,246 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417515790] [2020-12-23 06:53:09,246 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701015835] [2020-12-23 06:53:09,246 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:09,301 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:53:09,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:09,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 47 conjunts are in the unsatisfiable core [2020-12-23 06:53:09,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:09,607 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:09,608 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:09,608 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-23 06:53:09,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750615059] [2020-12-23 06:53:09,608 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 06:53:09,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:09,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 06:53:09,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-12-23 06:53:09,609 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 20 states. [2020-12-23 06:53:10,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:10,637 INFO L93 Difference]: Finished difference Result 212 states and 233 transitions. [2020-12-23 06:53:10,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 06:53:10,638 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 25 [2020-12-23 06:53:10,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:10,640 INFO L225 Difference]: With dead ends: 212 [2020-12-23 06:53:10,640 INFO L226 Difference]: Without dead ends: 201 [2020-12-23 06:53:10,640 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 12 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-12-23 06:53:10,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-12-23 06:53:10,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 31. [2020-12-23 06:53:10,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-23 06:53:10,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-12-23 06:53:10,647 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 25 [2020-12-23 06:53:10,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:10,647 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-12-23 06:53:10,647 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 06:53:10,647 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-12-23 06:53:10,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-23 06:53:10,648 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:10,648 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:10,859 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 06:53:10,859 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:10,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:10,860 INFO L82 PathProgramCache]: Analyzing trace with hash -735701587, now seen corresponding path program 17 times [2020-12-23 06:53:10,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:10,861 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329134201] [2020-12-23 06:53:10,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:10,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:11,212 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:11,212 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329134201] [2020-12-23 06:53:11,212 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225615064] [2020-12-23 06:53:11,213 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:27,845 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2020-12-23 06:53:27,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:27,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 06:53:27,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:27,944 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:27,945 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:27,945 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-23 06:53:27,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987986972] [2020-12-23 06:53:27,945 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 06:53:27,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:27,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 06:53:27,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-12-23 06:53:27,946 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 21 states. [2020-12-23 06:53:29,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:29,104 INFO L93 Difference]: Finished difference Result 223 states and 245 transitions. [2020-12-23 06:53:29,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-23 06:53:29,105 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 26 [2020-12-23 06:53:29,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:29,106 INFO L225 Difference]: With dead ends: 223 [2020-12-23 06:53:29,106 INFO L226 Difference]: Without dead ends: 212 [2020-12-23 06:53:29,107 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-12-23 06:53:29,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2020-12-23 06:53:29,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 32. [2020-12-23 06:53:29,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-23 06:53:29,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-12-23 06:53:29,117 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 26 [2020-12-23 06:53:29,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:29,118 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-12-23 06:53:29,118 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 06:53:29,118 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-12-23 06:53:29,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-23 06:53:29,127 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:29,127 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:29,334 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:29,335 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:29,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:29,336 INFO L82 PathProgramCache]: Analyzing trace with hash 889939858, now seen corresponding path program 18 times [2020-12-23 06:53:29,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:29,336 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588519511] [2020-12-23 06:53:29,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:29,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:29,741 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:29,742 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588519511] [2020-12-23 06:53:29,742 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848444501] [2020-12-23 06:53:29,742 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:47,708 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2020-12-23 06:53:47,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:47,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 41 conjunts are in the unsatisfiable core [2020-12-23 06:53:47,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:47,848 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:47,848 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:47,848 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-23 06:53:47,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147207581] [2020-12-23 06:53:47,849 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-23 06:53:47,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:47,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-23 06:53:47,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-12-23 06:53:47,850 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 22 states. [2020-12-23 06:53:49,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:49,117 INFO L93 Difference]: Finished difference Result 234 states and 257 transitions. [2020-12-23 06:53:49,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-23 06:53:49,118 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 27 [2020-12-23 06:53:49,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:49,119 INFO L225 Difference]: With dead ends: 234 [2020-12-23 06:53:49,120 INFO L226 Difference]: Without dead ends: 223 [2020-12-23 06:53:49,120 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-12-23 06:53:49,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2020-12-23 06:53:49,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 33. [2020-12-23 06:53:49,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-23 06:53:49,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-12-23 06:53:49,127 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 27 [2020-12-23 06:53:49,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:49,127 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-12-23 06:53:49,127 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-23 06:53:49,127 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-12-23 06:53:49,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-23 06:53:49,128 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:49,128 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:49,332 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:49,333 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:49,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:49,334 INFO L82 PathProgramCache]: Analyzing trace with hash -254782899, now seen corresponding path program 19 times [2020-12-23 06:53:49,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:49,334 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369627242] [2020-12-23 06:53:49,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:49,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:49,804 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:49,804 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369627242] [2020-12-23 06:53:49,805 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925559525] [2020-12-23 06:53:49,805 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:49,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:49,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 56 conjunts are in the unsatisfiable core [2020-12-23 06:53:49,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:50,303 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:50,303 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:50,303 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-23 06:53:50,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859290147] [2020-12-23 06:53:50,304 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-23 06:53:50,304 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:50,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-23 06:53:50,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-12-23 06:53:50,305 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 23 states. [2020-12-23 06:53:51,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:51,766 INFO L93 Difference]: Finished difference Result 245 states and 269 transitions. [2020-12-23 06:53:51,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-23 06:53:51,767 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 28 [2020-12-23 06:53:51,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:51,768 INFO L225 Difference]: With dead ends: 245 [2020-12-23 06:53:51,768 INFO L226 Difference]: Without dead ends: 234 [2020-12-23 06:53:51,769 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 13 SyntacticMatches, 15 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-12-23 06:53:51,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-12-23 06:53:51,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 34. [2020-12-23 06:53:51,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-23 06:53:51,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-12-23 06:53:51,776 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 28 [2020-12-23 06:53:51,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:51,776 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-12-23 06:53:51,776 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-23 06:53:51,776 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-12-23 06:53:51,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-23 06:53:51,777 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:51,777 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:51,981 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:51,982 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:51,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:51,983 INFO L82 PathProgramCache]: Analyzing trace with hash -1381449998, now seen corresponding path program 20 times [2020-12-23 06:53:51,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:51,983 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450425370] [2020-12-23 06:53:51,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:52,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:52,485 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:52,485 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450425370] [2020-12-23 06:53:52,486 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227365264] [2020-12-23 06:53:52,486 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 06:53:52,547 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:53:52,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:52,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 57 conjunts are in the unsatisfiable core [2020-12-23 06:53:52,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:52,967 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:52,967 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:52,967 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-23 06:53:52,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926125099] [2020-12-23 06:53:52,968 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 06:53:52,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:52,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 06:53:52,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-12-23 06:53:52,969 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 24 states. [2020-12-23 06:53:54,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:54,603 INFO L93 Difference]: Finished difference Result 256 states and 281 transitions. [2020-12-23 06:53:54,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-23 06:53:54,606 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 29 [2020-12-23 06:53:54,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:54,607 INFO L225 Difference]: With dead ends: 256 [2020-12-23 06:53:54,607 INFO L226 Difference]: Without dead ends: 245 [2020-12-23 06:53:54,608 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 14 SyntacticMatches, 15 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-12-23 06:53:54,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2020-12-23 06:53:54,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 35. [2020-12-23 06:53:54,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-23 06:53:54,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-12-23 06:53:54,616 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 29 [2020-12-23 06:53:54,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:54,616 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-12-23 06:53:54,616 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 06:53:54,616 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-12-23 06:53:54,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-23 06:53:54,617 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:54,618 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:54,832 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-23 06:53:54,833 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:54,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:54,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1948391699, now seen corresponding path program 21 times [2020-12-23 06:53:54,834 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:54,834 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392961469] [2020-12-23 06:53:54,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:54,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:55,332 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:55,332 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392961469] [2020-12-23 06:53:55,332 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802800803] [2020-12-23 06:53:55,332 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 06:54:14,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-23 06:54:14,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:54:14,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 46 conjunts are in the unsatisfiable core [2020-12-23 06:54:14,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:54:14,516 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:54:14,517 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:54:14,517 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-23 06:54:14,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650121965] [2020-12-23 06:54:14,517 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-23 06:54:14,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:54:14,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-23 06:54:14,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-12-23 06:54:14,518 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 25 states. [2020-12-23 06:54:16,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:54:16,299 INFO L93 Difference]: Finished difference Result 267 states and 293 transitions. [2020-12-23 06:54:16,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-23 06:54:16,300 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 30 [2020-12-23 06:54:16,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:54:16,302 INFO L225 Difference]: With dead ends: 267 [2020-12-23 06:54:16,302 INFO L226 Difference]: Without dead ends: 256 [2020-12-23 06:54:16,303 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-12-23 06:54:16,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-12-23 06:54:16,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 36. [2020-12-23 06:54:16,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-23 06:54:16,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-23 06:54:16,309 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 30 [2020-12-23 06:54:16,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:54:16,309 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-23 06:54:16,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-23 06:54:16,309 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-23 06:54:16,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-23 06:54:16,310 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:54:16,310 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:54:16,512 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2020-12-23 06:54:16,513 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:54:16,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:54:16,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1951252050, now seen corresponding path program 22 times [2020-12-23 06:54:16,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:54:16,519 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676406548] [2020-12-23 06:54:16,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:54:16,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:54:17,067 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:54:17,067 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676406548] [2020-12-23 06:54:17,068 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840137741] [2020-12-23 06:54:17,068 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:54:17,138 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:54:17,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:54:17,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 65 conjunts are in the unsatisfiable core [2020-12-23 06:54:17,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:54:17,726 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:54:17,726 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:54:17,726 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-23 06:54:17,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565464726] [2020-12-23 06:54:17,727 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-23 06:54:17,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:54:17,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-23 06:54:17,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-12-23 06:54:17,728 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 26 states. [2020-12-23 06:54:19,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:54:19,668 INFO L93 Difference]: Finished difference Result 278 states and 305 transitions. [2020-12-23 06:54:19,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-23 06:54:19,668 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 31 [2020-12-23 06:54:19,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:54:19,669 INFO L225 Difference]: With dead ends: 278 [2020-12-23 06:54:19,670 INFO L226 Difference]: Without dead ends: 267 [2020-12-23 06:54:19,670 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 13 SyntacticMatches, 18 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-12-23 06:54:19,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2020-12-23 06:54:19,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 37. [2020-12-23 06:54:19,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-23 06:54:19,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-12-23 06:54:19,678 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 31 [2020-12-23 06:54:19,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:54:19,678 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-12-23 06:54:19,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-23 06:54:19,678 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-12-23 06:54:19,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-23 06:54:19,679 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:54:19,679 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:54:19,892 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:54:19,893 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:54:19,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:54:19,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1713843315, now seen corresponding path program 23 times [2020-12-23 06:54:19,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:54:19,894 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214051170] [2020-12-23 06:54:19,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:54:19,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:54:20,427 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:54:20,428 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214051170] [2020-12-23 06:54:20,428 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16324517] [2020-12-23 06:54:20,428 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:55:20,177 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2020-12-23 06:55:20,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:55:20,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 50 conjunts are in the unsatisfiable core [2020-12-23 06:55:20,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:55:20,333 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:55:20,333 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:55:20,333 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2020-12-23 06:55:20,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495027750] [2020-12-23 06:55:20,334 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-23 06:55:20,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:55:20,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-23 06:55:20,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-12-23 06:55:20,335 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 27 states. [2020-12-23 06:55:22,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:55:22,569 INFO L93 Difference]: Finished difference Result 289 states and 317 transitions. [2020-12-23 06:55:22,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-23 06:55:22,570 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 32 [2020-12-23 06:55:22,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:55:22,571 INFO L225 Difference]: With dead ends: 289 [2020-12-23 06:55:22,571 INFO L226 Difference]: Without dead ends: 278 [2020-12-23 06:55:22,572 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-12-23 06:55:22,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2020-12-23 06:55:22,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 38. [2020-12-23 06:55:22,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-23 06:55:22,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-12-23 06:55:22,580 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 32 [2020-12-23 06:55:22,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:55:22,581 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-12-23 06:55:22,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-23 06:55:22,581 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-12-23 06:55:22,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-23 06:55:22,581 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:55:22,581 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:55:22,795 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2020-12-23 06:55:22,795 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:55:22,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:55:22,796 INFO L82 PathProgramCache]: Analyzing trace with hash 632317362, now seen corresponding path program 24 times [2020-12-23 06:55:22,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:55:22,797 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481013541] [2020-12-23 06:55:22,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:55:22,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:55:23,474 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:55:23,474 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481013541] [2020-12-23 06:55:23,475 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260185103] [2020-12-23 06:55:23,475 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 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