java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:34:27,715 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:34:27,717 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:34:27,732 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:34:27,733 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:34:27,734 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:34:27,735 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:34:27,737 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:34:27,739 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:34:27,740 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:34:27,740 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:34:27,740 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:34:27,741 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:34:27,742 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:34:27,742 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:34:27,745 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:34:27,747 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:34:27,749 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:34:27,751 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:34:27,752 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:34:27,754 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 10:34:27,754 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 10:34:27,754 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 10:34:27,755 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 10:34:27,756 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 10:34:27,758 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 10:34:27,758 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 10:34:27,759 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 10:34:27,759 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 10:34:27,759 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:34:27,760 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:34:27,760 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf [2018-01-21 10:34:27,770 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:34:27,771 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:34:27,772 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:34:27,772 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:34:27,772 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:34:27,772 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:34:27,772 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:34:27,773 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:34:27,773 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:34:27,774 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:34:27,774 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:34:27,774 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:34:27,774 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:34:27,774 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:34:27,775 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:34:27,775 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:34:27,775 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:34:27,775 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:34:27,775 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:34:27,776 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:34:27,776 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:34:27,776 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:34:27,776 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:34:27,776 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:34:27,777 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:34:27,777 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:34:27,777 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:34:27,777 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:34:27,777 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:34:27,778 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:34:27,778 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:34:27,778 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:34:27,778 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:34:27,778 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:34:27,779 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:34:27,779 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:34:27,779 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:34:27,780 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:34:27,780 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:34:27,816 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:34:27,829 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:34:27,833 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:34:27,834 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:34:27,835 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:34:27,835 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-21 10:34:27,978 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:34:27,983 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:34:27,984 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:34:27,984 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:34:27,988 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:34:27,989 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:34:27" (1/1) ... [2018-01-21 10:34:27,992 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fff9275 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:27, skipping insertion in model container [2018-01-21 10:34:27,992 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:34:27" (1/1) ... [2018-01-21 10:34:28,006 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:34:28,021 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:34:28,125 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:34:28,140 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:34:28,146 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28 WrapperNode [2018-01-21 10:34:28,146 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:34:28,147 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:34:28,148 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:34:28,148 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:34:28,165 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28" (1/1) ... [2018-01-21 10:34:28,165 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28" (1/1) ... [2018-01-21 10:34:28,175 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28" (1/1) ... [2018-01-21 10:34:28,175 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28" (1/1) ... [2018-01-21 10:34:28,178 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28" (1/1) ... [2018-01-21 10:34:28,182 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28" (1/1) ... [2018-01-21 10:34:28,183 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28" (1/1) ... [2018-01-21 10:34:28,184 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:34:28,185 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:34:28,185 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:34:28,185 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:34:28,186 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28" (1/1) ... No working directory specified, using /storage/ultimate/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 [2018-01-21 10:34:28,231 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:34:28,231 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:34:28,231 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 10:34:28,231 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:34:28,231 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:34:28,231 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:34:28,232 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:34:28,232 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:34:28,232 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:34:28,232 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 10:34:28,232 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:34:28,232 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:34:28,232 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:34:28,405 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:34:28,405 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:34:28 BoogieIcfgContainer [2018-01-21 10:34:28,406 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:34:28,406 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:34:28,406 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:34:28,408 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:34:28,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:34:27" (1/3) ... [2018-01-21 10:34:28,409 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e7ec286 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:34:28, skipping insertion in model container [2018-01-21 10:34:28,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:28" (2/3) ... [2018-01-21 10:34:28,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e7ec286 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:34:28, skipping insertion in model container [2018-01-21 10:34:28,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:34:28" (3/3) ... [2018-01-21 10:34:28,412 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-21 10:34:28,423 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:34:28,432 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 10:34:28,472 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:34:28,473 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:34:28,473 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:34:28,473 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:34:28,473 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:34:28,473 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:34:28,473 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:34:28,474 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:34:28,475 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:34:28,495 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:34:28,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:34:28,502 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:28,503 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:34:28,503 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:34:28,509 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 10:34:28,512 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:28,558 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,559 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:28,559 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,559 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:28,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:34:28,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:34:28,610 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:34:28,616 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:34:28,622 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:34:28,622 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:34:28,622 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:34:28,622 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:34:28,622 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:34:28,623 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:34:28,623 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:34:28,623 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 10:34:28,623 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:34:28,624 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:34:28,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 10:34:28,625 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:28,625 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:28,625 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 10:34:28,626 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 10:34:28,626 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:28,627 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,627 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:28,627 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,627 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:28,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:28,648 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:28,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:28,683 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:34:28,683 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:34:28,683 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:34:28,684 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:34:28,694 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:34:28,695 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:34:28,698 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:34:28,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:28,726 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:34:28,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:34:28,728 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 10:34:28,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:28,736 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:34:28,736 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 10:34:28,739 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:34:28,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 10:34:28,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 10:34:28,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 10:34:28,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 10:34:28,825 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 10:34:28,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:28,825 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 10:34:28,825 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:34:28,825 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 10:34:28,825 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 10:34:28,828 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:34:28,828 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:34:28,829 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:34:28,829 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:34:28,829 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:34:28,829 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:34:28,829 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:34:28,829 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:34:28,830 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:34:28,831 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:34:28,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 10:34:28,833 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:28,833 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:28,833 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:28,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 10:34:28,834 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:28,835 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,835 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:28,835 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,835 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:28,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:28,845 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:28,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:28,860 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:34:28,860 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:34:28,861 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:34:28,861 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:34:28,861 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:34:28,861 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:34:28,862 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:34:28,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:28,868 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:34:28,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:34:28,868 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 10:34:28,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:28,871 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:34:28,871 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 10:34:28,872 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:34:28,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 10:34:28,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 10:34:28,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 10:34:28,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 10:34:28,886 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 10:34:28,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:28,886 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 10:34:28,886 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:34:28,886 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 10:34:28,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 10:34:28,887 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:28,888 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:28,888 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:28,888 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 10:34:28,888 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:28,889 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,889 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:28,889 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,890 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:28,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:28,902 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:28,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:28,938 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:34:28,938 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:34:28,938 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:34:28,940 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:34:28,940 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:34:28,940 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:34:28,941 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 10:34:29,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:29,004 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 10:34:29,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:34:29,004 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 10:34:29,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:29,008 INFO L225 Difference]: With dead ends: 66 [2018-01-21 10:34:29,009 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 10:34:29,010 INFO L525 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 [2018-01-21 10:34:29,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 10:34:29,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 10:34:29,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 10:34:29,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 10:34:29,023 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 10:34:29,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:29,024 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 10:34:29,024 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:34:29,024 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 10:34:29,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 10:34:29,025 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:29,025 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:29,025 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:29,026 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 10:34:29,026 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:29,027 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:29,027 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:29,027 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:29,027 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:29,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:29,049 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:29,216 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:29,217 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:34:29,217 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 10:34:29,217 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:34:29,217 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:34:29,218 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:34:29,218 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-01-21 10:34:29,218 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 10:34:29,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:29,295 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 10:34:29,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 10:34:29,295 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 10:34:29,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:29,296 INFO L225 Difference]: With dead ends: 80 [2018-01-21 10:34:29,297 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 10:34:29,297 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-01-21 10:34:29,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 10:34:29,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 10:34:29,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 10:34:29,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 10:34:29,304 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 10:34:29,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:29,304 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 10:34:29,304 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:34:29,305 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 10:34:29,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 10:34:29,306 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:29,306 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:29,306 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:29,307 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 10:34:29,307 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:29,308 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:29,308 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:29,308 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:29,308 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:29,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:29,325 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:29,428 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:29,428 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:29,429 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:29,430 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 10:34:29,431 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 10:34:29,481 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:34:29,482 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:34:30,760 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:34:30,762 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-21 10:34:30,775 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:34:30,775 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:30,775 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:30,797 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:30,797 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:30,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:30,834 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:30,954 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:30,954 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:31,325 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:31,357 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:31,357 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:31,361 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:31,361 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:31,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:31,392 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:31,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:34:31,440 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:31,527 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:34:31,529 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:31,530 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 4, 4] total 15 [2018-01-21 10:34:31,530 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:31,530 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 10:34:31,531 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 10:34:31,531 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2018-01-21 10:34:31,531 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-21 10:34:31,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:31,712 INFO L93 Difference]: Finished difference Result 87 states and 94 transitions. [2018-01-21 10:34:31,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 10:34:31,717 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 10:34:31,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:31,718 INFO L225 Difference]: With dead ends: 87 [2018-01-21 10:34:31,718 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 10:34:31,719 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-01-21 10:34:31,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 10:34:31,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2018-01-21 10:34:31,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 10:34:31,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-01-21 10:34:31,726 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 36 [2018-01-21 10:34:31,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:31,727 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-01-21 10:34:31,727 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 10:34:31,727 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-01-21 10:34:31,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 10:34:31,728 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:31,728 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:31,729 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:31,729 INFO L82 PathProgramCache]: Analyzing trace with hash -524554428, now seen corresponding path program 2 times [2018-01-21 10:34:31,729 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:31,730 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:31,730 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:31,730 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:31,730 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:31,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:31,747 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:31,863 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:31,864 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:31,864 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:31,864 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:31,864 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:31,864 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:31,864 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:31,874 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:31,874 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:31,890 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:31,897 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:31,898 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:31,901 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:31,967 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:31,967 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:32,071 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:32,091 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:32,091 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:32,094 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:32,094 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:32,104 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:32,115 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:32,126 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:32,130 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:32,186 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 10:34:32,187 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:32,230 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 10:34:32,231 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:32,232 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 4, 4] total 18 [2018-01-21 10:34:32,232 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:32,232 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:34:32,232 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:34:32,232 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2018-01-21 10:34:32,232 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 10 states. [2018-01-21 10:34:32,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:32,355 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2018-01-21 10:34:32,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 10:34:32,356 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 41 [2018-01-21 10:34:32,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:32,357 INFO L225 Difference]: With dead ends: 97 [2018-01-21 10:34:32,357 INFO L226 Difference]: Without dead ends: 56 [2018-01-21 10:34:32,357 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:34:32,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-01-21 10:34:32,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2018-01-21 10:34:32,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-21 10:34:32,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-01-21 10:34:32,362 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 41 [2018-01-21 10:34:32,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:32,362 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-01-21 10:34:32,362 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:34:32,362 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-01-21 10:34:32,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 10:34:32,363 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:32,363 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:32,363 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:32,364 INFO L82 PathProgramCache]: Analyzing trace with hash -438141712, now seen corresponding path program 3 times [2018-01-21 10:34:32,364 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:32,364 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:32,364 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:32,364 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:32,365 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:32,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:32,379 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:32,654 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:32,654 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:32,654 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:32,654 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:32,654 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:32,654 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:32,654 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:32,662 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:32,662 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:32,672 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:32,676 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:32,677 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:32,679 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:32,727 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 10:34:32,727 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:32,799 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 10:34:32,826 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:32,826 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:32,829 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:32,829 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:32,843 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:32,852 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:32,860 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:32,864 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:32,867 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 10:34:32,868 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:32,885 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 10:34:32,886 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:32,886 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 4, 4] total 11 [2018-01-21 10:34:32,886 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:32,886 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 10:34:32,887 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 10:34:32,887 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-01-21 10:34:32,887 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 9 states. [2018-01-21 10:34:33,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:33,007 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2018-01-21 10:34:33,007 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 10:34:33,007 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2018-01-21 10:34:33,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:33,009 INFO L225 Difference]: With dead ends: 131 [2018-01-21 10:34:33,009 INFO L226 Difference]: Without dead ends: 85 [2018-01-21 10:34:33,010 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-01-21 10:34:33,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-01-21 10:34:33,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2018-01-21 10:34:33,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-01-21 10:34:33,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 72 transitions. [2018-01-21 10:34:33,018 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 72 transitions. Word has length 46 [2018-01-21 10:34:33,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:33,018 INFO L432 AbstractCegarLoop]: Abstraction has 67 states and 72 transitions. [2018-01-21 10:34:33,019 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 10:34:33,019 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 72 transitions. [2018-01-21 10:34:33,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-01-21 10:34:33,022 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:33,022 INFO L322 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:33,022 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:33,023 INFO L82 PathProgramCache]: Analyzing trace with hash 515188947, now seen corresponding path program 4 times [2018-01-21 10:34:33,023 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:33,024 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:33,024 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:33,024 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:33,024 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:33,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:33,044 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:33,204 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 10:34:33,205 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:33,205 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:33,205 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:33,205 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:33,205 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:33,205 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:33,210 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:34:33,210 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:34:33,232 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:33,235 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:33,333 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-21 10:34:33,333 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:33,531 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 10:34:33,553 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:33,553 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:33,560 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:34:33,560 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:34:33,620 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:33,625 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:33,640 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-21 10:34:33,640 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:33,696 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 10:34:33,697 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:33,698 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-21 10:34:33,698 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:33,698 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 10:34:33,699 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 10:34:33,699 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2018-01-21 10:34:33,699 INFO L87 Difference]: Start difference. First operand 67 states and 72 transitions. Second operand 14 states. [2018-01-21 10:34:33,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:33,881 INFO L93 Difference]: Finished difference Result 134 states and 145 transitions. [2018-01-21 10:34:33,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 10:34:33,881 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 82 [2018-01-21 10:34:33,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:33,882 INFO L225 Difference]: With dead ends: 134 [2018-01-21 10:34:33,882 INFO L226 Difference]: Without dead ends: 75 [2018-01-21 10:34:33,883 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 314 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=201, Invalid=449, Unknown=0, NotChecked=0, Total=650 [2018-01-21 10:34:33,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-21 10:34:33,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2018-01-21 10:34:33,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-01-21 10:34:33,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-01-21 10:34:33,891 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 82 [2018-01-21 10:34:33,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:33,891 INFO L432 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-01-21 10:34:33,892 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 10:34:33,892 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-01-21 10:34:33,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-01-21 10:34:33,893 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:33,894 INFO L322 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:33,894 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:33,894 INFO L82 PathProgramCache]: Analyzing trace with hash -611097235, now seen corresponding path program 5 times [2018-01-21 10:34:33,894 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:33,895 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:33,895 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:33,895 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:33,895 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:33,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:33,912 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:34,130 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 10:34:34,130 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:34,130 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:34,130 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:34,131 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:34,131 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:34,131 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:34,139 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:34:34,139 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:34,148 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,152 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,154 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,157 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,159 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,165 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,166 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:34,168 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:34,327 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-21 10:34:34,327 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:34,502 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 10:34:34,523 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:34,523 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:34,526 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:34:34,526 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:34,535 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,538 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,545 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,554 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,565 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,581 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:34,590 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:34,594 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:34,607 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-21 10:34:34,607 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:34,752 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 10:34:34,754 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:34,755 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-21 10:34:34,755 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:34,755 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 10:34:34,756 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 10:34:34,756 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-01-21 10:34:34,756 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 16 states. [2018-01-21 10:34:34,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:34,989 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2018-01-21 10:34:34,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 10:34:34,989 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 92 [2018-01-21 10:34:34,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:34,990 INFO L225 Difference]: With dead ends: 144 [2018-01-21 10:34:34,990 INFO L226 Difference]: Without dead ends: 80 [2018-01-21 10:34:34,991 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 352 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=268, Invalid=602, Unknown=0, NotChecked=0, Total=870 [2018-01-21 10:34:34,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-21 10:34:34,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 77. [2018-01-21 10:34:34,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-21 10:34:34,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-01-21 10:34:35,000 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 92 [2018-01-21 10:34:35,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:35,000 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-01-21 10:34:35,000 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 10:34:35,001 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-01-21 10:34:35,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-01-21 10:34:35,002 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:35,003 INFO L322 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:35,003 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:35,003 INFO L82 PathProgramCache]: Analyzing trace with hash -556985837, now seen corresponding path program 6 times [2018-01-21 10:34:35,003 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:35,004 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:35,004 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:35,004 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:35,004 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:35,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:35,022 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:35,227 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 5 proven. 296 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-01-21 10:34:35,227 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:35,227 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:35,227 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:35,227 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:35,227 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:35,227 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:35,232 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:34:35,232 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:34:35,241 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,243 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,246 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,248 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,251 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,252 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:35,254 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:35,277 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 10:34:35,306 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:35,347 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 10:34:35,367 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:35,367 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:35,370 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:34:35,370 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:34:35,383 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,389 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,399 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,411 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,430 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:35,440 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:35,444 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:35,455 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 10:34:35,455 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:35,481 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 10:34:35,482 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:35,482 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5, 5, 5] total 16 [2018-01-21 10:34:35,482 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:35,483 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 10:34:35,483 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 10:34:35,483 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2018-01-21 10:34:35,483 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-01-21 10:34:35,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:35,601 INFO L93 Difference]: Finished difference Result 183 states and 202 transitions. [2018-01-21 10:34:35,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 10:34:35,601 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 102 [2018-01-21 10:34:35,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:35,602 INFO L225 Difference]: With dead ends: 183 [2018-01-21 10:34:35,602 INFO L226 Difference]: Without dead ends: 114 [2018-01-21 10:34:35,602 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:34:35,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-01-21 10:34:35,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 91. [2018-01-21 10:34:35,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-01-21 10:34:35,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2018-01-21 10:34:35,609 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 102 [2018-01-21 10:34:35,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:35,609 INFO L432 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2018-01-21 10:34:35,609 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 10:34:35,609 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2018-01-21 10:34:35,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-01-21 10:34:35,611 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:35,611 INFO L322 BasicCegarLoop]: trace histogram [24, 21, 21, 21, 21, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:35,611 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:35,611 INFO L82 PathProgramCache]: Analyzing trace with hash 294495146, now seen corresponding path program 7 times [2018-01-21 10:34:35,611 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:35,612 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:35,612 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:35,612 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:35,612 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:35,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:35,635 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:35,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 10:34:35,911 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:35,911 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:35,911 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:35,911 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:35,911 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:35,911 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:35,916 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:35,916 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:35,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:35,949 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:36,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-21 10:34:36,069 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:36,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 10:34:36,315 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:36,315 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:36,318 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:36,318 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:36,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:36,377 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:36,402 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-21 10:34:36,402 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:36,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 10:34:36,485 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:36,485 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-21 10:34:36,485 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:36,486 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 10:34:36,487 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 10:34:36,487 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=582, Unknown=0, NotChecked=0, Total=812 [2018-01-21 10:34:36,487 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand 20 states. [2018-01-21 10:34:36,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:36,702 INFO L93 Difference]: Finished difference Result 182 states and 198 transitions. [2018-01-21 10:34:36,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 10:34:36,703 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 158 [2018-01-21 10:34:36,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:36,703 INFO L225 Difference]: With dead ends: 182 [2018-01-21 10:34:36,704 INFO L226 Difference]: Without dead ends: 99 [2018-01-21 10:34:36,704 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 650 GetRequests, 612 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=432, Invalid=974, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:34:36,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-01-21 10:34:36,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2018-01-21 10:34:36,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 10:34:36,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2018-01-21 10:34:36,710 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 158 [2018-01-21 10:34:36,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:36,711 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2018-01-21 10:34:36,711 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 10:34:36,711 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2018-01-21 10:34:36,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-01-21 10:34:36,713 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:36,714 INFO L322 BasicCegarLoop]: trace histogram [27, 24, 24, 24, 24, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:36,714 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:36,714 INFO L82 PathProgramCache]: Analyzing trace with hash 1051815268, now seen corresponding path program 8 times [2018-01-21 10:34:36,714 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:36,715 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:36,715 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:36,715 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:36,715 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:36,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:36,733 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:37,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 10:34:37,041 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:37,041 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:37,042 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:37,042 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:37,042 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:37,042 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:37,047 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:37,047 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:37,059 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:37,078 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:37,082 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:37,086 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:37,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-21 10:34:37,230 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:37,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 10:34:37,520 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:37,520 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:37,523 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:37,523 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:37,540 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:37,571 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:37,596 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:37,603 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:37,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-21 10:34:37,632 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:37,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 10:34:37,759 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:37,759 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-21 10:34:37,759 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:37,760 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 10:34:37,760 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 10:34:37,760 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=712, Unknown=0, NotChecked=0, Total=992 [2018-01-21 10:34:37,760 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 22 states. [2018-01-21 10:34:37,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:37,997 INFO L93 Difference]: Finished difference Result 192 states and 208 transitions. [2018-01-21 10:34:37,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 10:34:37,997 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 173 [2018-01-21 10:34:37,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:37,998 INFO L225 Difference]: With dead ends: 192 [2018-01-21 10:34:37,998 INFO L226 Difference]: Without dead ends: 104 [2018-01-21 10:34:37,999 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 670 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=529, Invalid=1193, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 10:34:37,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-01-21 10:34:38,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 101. [2018-01-21 10:34:38,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-21 10:34:38,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 108 transitions. [2018-01-21 10:34:38,004 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 108 transitions. Word has length 173 [2018-01-21 10:34:38,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:38,004 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 108 transitions. [2018-01-21 10:34:38,004 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 10:34:38,005 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 108 transitions. [2018-01-21 10:34:38,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-01-21 10:34:38,007 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:38,007 INFO L322 BasicCegarLoop]: trace histogram [30, 27, 27, 27, 27, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:38,007 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:38,007 INFO L82 PathProgramCache]: Analyzing trace with hash 1142155370, now seen corresponding path program 9 times [2018-01-21 10:34:38,008 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:38,008 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:38,009 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:38,009 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:38,009 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:38,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:38,033 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:38,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 8 proven. 1090 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2018-01-21 10:34:38,396 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:38,396 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:38,396 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:38,396 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:38,396 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:38,397 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:38,402 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:38,402 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:38,417 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:38,421 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:38,429 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:38,434 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:38,443 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:38,448 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:38,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 10:34:38,517 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:38,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 10:34:38,612 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:38,612 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:38,615 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:38,615 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:38,632 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:38,640 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:38,653 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:38,674 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:38,685 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:38,690 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:38,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 10:34:38,707 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:38,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 10:34:38,751 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:38,751 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6, 6, 6] total 21 [2018-01-21 10:34:38,751 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:38,752 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 10:34:38,752 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 10:34:38,752 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-01-21 10:34:38,752 INFO L87 Difference]: Start difference. First operand 101 states and 108 transitions. Second operand 17 states. [2018-01-21 10:34:38,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:38,893 INFO L93 Difference]: Finished difference Result 236 states and 260 transitions. [2018-01-21 10:34:38,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 10:34:38,893 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 188 [2018-01-21 10:34:38,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:38,894 INFO L225 Difference]: With dead ends: 236 [2018-01-21 10:34:38,895 INFO L226 Difference]: Without dead ends: 143 [2018-01-21 10:34:38,895 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 744 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=338, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:34:38,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-21 10:34:38,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 115. [2018-01-21 10:34:38,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-21 10:34:38,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-01-21 10:34:38,903 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 188 [2018-01-21 10:34:38,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:38,903 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-01-21 10:34:38,903 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 10:34:38,904 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-01-21 10:34:38,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-01-21 10:34:38,906 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:38,906 INFO L322 BasicCegarLoop]: trace histogram [44, 40, 40, 40, 40, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:38,906 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:38,906 INFO L82 PathProgramCache]: Analyzing trace with hash 132824627, now seen corresponding path program 10 times [2018-01-21 10:34:38,906 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:38,907 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:38,907 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:38,907 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:38,907 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:38,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:38,929 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:39,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 10:34:39,345 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:39,345 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:39,345 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:39,345 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:39,345 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:39,345 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:39,350 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:34:39,350 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:34:39,403 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:39,407 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:39,634 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-21 10:34:39,634 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:40,088 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 10:34:40,108 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:40,108 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:40,111 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:34:40,112 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:34:40,461 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:40,473 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:40,516 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-21 10:34:40,517 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:40,711 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 10:34:40,714 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:40,715 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-21 10:34:40,715 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:40,715 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 10:34:40,716 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 10:34:40,716 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:34:40,716 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 26 states. [2018-01-21 10:34:41,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:41,051 INFO L93 Difference]: Finished difference Result 230 states and 251 transitions. [2018-01-21 10:34:41,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 10:34:41,052 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 264 [2018-01-21 10:34:41,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:41,053 INFO L225 Difference]: With dead ends: 230 [2018-01-21 10:34:41,053 INFO L226 Difference]: Without dead ends: 123 [2018-01-21 10:34:41,054 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1080 GetRequests, 1030 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=753, Invalid=1697, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 10:34:41,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-21 10:34:41,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2018-01-21 10:34:41,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-01-21 10:34:41,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 129 transitions. [2018-01-21 10:34:41,062 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 129 transitions. Word has length 264 [2018-01-21 10:34:41,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:41,062 INFO L432 AbstractCegarLoop]: Abstraction has 120 states and 129 transitions. [2018-01-21 10:34:41,062 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 10:34:41,062 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 129 transitions. [2018-01-21 10:34:41,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-01-21 10:34:41,063 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:41,063 INFO L322 BasicCegarLoop]: trace histogram [48, 44, 44, 44, 44, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:41,063 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:41,063 INFO L82 PathProgramCache]: Analyzing trace with hash -171303065, now seen corresponding path program 11 times [2018-01-21 10:34:41,064 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:41,064 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:41,064 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:41,065 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:41,065 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:41,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:41,087 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:41,546 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 10:34:41,546 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:41,546 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:41,546 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:41,546 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:41,546 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:41,546 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:41,552 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:34:41,552 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:41,568 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,569 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,572 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,575 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,578 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,582 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,586 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,591 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,596 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,602 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,609 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,618 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,633 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,635 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:41,641 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:41,869 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-21 10:34:41,869 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:42,359 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 10:34:42,379 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:42,379 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:42,382 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:34:42,382 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:42,404 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,409 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,420 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,439 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,469 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,507 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,548 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,603 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,683 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,808 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,982 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:43,227 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:43,551 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:43,602 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:43,612 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:43,679 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-21 10:34:43,679 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:43,849 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 10:34:43,852 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:43,852 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-21 10:34:43,853 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:43,853 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 10:34:43,854 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 10:34:43,854 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 10:34:43,854 INFO L87 Difference]: Start difference. First operand 120 states and 129 transitions. Second operand 28 states. [2018-01-21 10:34:44,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:44,341 INFO L93 Difference]: Finished difference Result 240 states and 261 transitions. [2018-01-21 10:34:44,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 10:34:44,341 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 284 [2018-01-21 10:34:44,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:44,343 INFO L225 Difference]: With dead ends: 240 [2018-01-21 10:34:44,343 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 10:34:44,344 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1162 GetRequests, 1108 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=880, Invalid=1982, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 10:34:44,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 10:34:44,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 125. [2018-01-21 10:34:44,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-01-21 10:34:44,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2018-01-21 10:34:44,349 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 284 [2018-01-21 10:34:44,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:44,349 INFO L432 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2018-01-21 10:34:44,349 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 10:34:44,350 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2018-01-21 10:34:44,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-01-21 10:34:44,352 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:44,352 INFO L322 BasicCegarLoop]: trace histogram [52, 48, 48, 48, 48, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:44,352 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:44,353 INFO L82 PathProgramCache]: Analyzing trace with hash -2029948749, now seen corresponding path program 12 times [2018-01-21 10:34:44,353 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:44,354 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:44,354 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:44,354 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:44,354 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:44,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:44,389 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:45,059 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 11 proven. 2673 refuted. 0 times theorem prover too weak. 3414 trivial. 0 not checked. [2018-01-21 10:34:45,059 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:45,059 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:45,059 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:45,059 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:45,059 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:45,059 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:45,070 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:34:45,070 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:34:45,091 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,105 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,114 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,123 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,132 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,144 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,153 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,164 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,179 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,181 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:45,185 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:45,311 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 10:34:45,311 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:45,468 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 10:34:45,489 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:45,490 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:45,493 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:34:45,493 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:34:45,522 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,528 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,541 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,555 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,576 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,606 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,646 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,729 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,998 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:46,022 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:46,029 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:46,061 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 10:34:46,061 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:46,135 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 10:34:46,137 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:46,138 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7, 7, 7, 7] total 26 [2018-01-21 10:34:46,138 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:46,138 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 10:34:46,139 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 10:34:46,139 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2018-01-21 10:34:46,139 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand 21 states. [2018-01-21 10:34:46,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:46,330 INFO L93 Difference]: Finished difference Result 289 states and 318 transitions. [2018-01-21 10:34:46,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 10:34:46,330 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 304 [2018-01-21 10:34:46,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:46,331 INFO L225 Difference]: With dead ends: 289 [2018-01-21 10:34:46,331 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 10:34:46,332 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1231 GetRequests, 1206 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2018-01-21 10:34:46,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 10:34:46,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 139. [2018-01-21 10:34:46,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-01-21 10:34:46,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-01-21 10:34:46,341 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 304 [2018-01-21 10:34:46,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:46,341 INFO L432 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-01-21 10:34:46,341 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 10:34:46,341 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-01-21 10:34:46,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2018-01-21 10:34:46,344 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:46,344 INFO L322 BasicCegarLoop]: trace histogram [70, 65, 65, 65, 65, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:46,345 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:46,345 INFO L82 PathProgramCache]: Analyzing trace with hash 1350287972, now seen corresponding path program 13 times [2018-01-21 10:34:46,345 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:46,346 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:46,346 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:46,346 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:46,346 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:46,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:46,384 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:47,146 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 10:34:47,146 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:47,146 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:47,146 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:47,147 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:47,147 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:47,147 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:47,152 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:47,152 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:47,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:47,220 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:47,541 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-21 10:34:47,541 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:48,103 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 10:34:48,123 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:48,123 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:48,126 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:48,126 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:48,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:48,295 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:48,376 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-21 10:34:48,376 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:48,557 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 10:34:48,558 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:48,559 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-21 10:34:48,559 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:48,559 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 10:34:48,559 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 10:34:48,560 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=1557, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 10:34:48,560 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 32 states. [2018-01-21 10:34:48,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:48,933 INFO L93 Difference]: Finished difference Result 278 states and 304 transitions. [2018-01-21 10:34:48,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 10:34:48,933 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 400 [2018-01-21 10:34:48,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:48,935 INFO L225 Difference]: With dead ends: 278 [2018-01-21 10:34:48,935 INFO L226 Difference]: Without dead ends: 147 [2018-01-21 10:34:48,937 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1630 GetRequests, 1568 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1164, Invalid=2618, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 10:34:48,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-01-21 10:34:48,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2018-01-21 10:34:48,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-01-21 10:34:48,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 155 transitions. [2018-01-21 10:34:48,945 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 155 transitions. Word has length 400 [2018-01-21 10:34:48,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:48,946 INFO L432 AbstractCegarLoop]: Abstraction has 144 states and 155 transitions. [2018-01-21 10:34:48,946 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 10:34:48,946 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 155 transitions. [2018-01-21 10:34:48,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-21 10:34:48,949 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:48,949 INFO L322 BasicCegarLoop]: trace histogram [75, 70, 70, 70, 70, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:48,949 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:48,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1570210812, now seen corresponding path program 14 times [2018-01-21 10:34:48,950 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:48,951 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:48,951 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:48,951 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:48,951 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:48,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:48,988 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:49,489 WARN L146 SmtUtils]: Spent 142ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 10:34:50,190 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 10:34:50,191 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:50,191 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:50,191 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:50,191 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:50,191 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:50,191 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:50,198 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:50,198 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:50,221 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:50,266 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:50,273 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:50,279 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:50,629 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-21 10:34:50,629 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:50,971 WARN L143 SmtUtils]: Spent 197ms on a formula simplification that was a NOOP. DAG size: 52 [2018-01-21 10:34:51,158 WARN L143 SmtUtils]: Spent 187ms on a formula simplification that was a NOOP. DAG size: 52 [2018-01-21 10:34:52,456 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 10:34:52,475 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:52,475 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:52,478 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:52,478 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:52,505 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:52,573 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:52,627 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:52,637 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:52,716 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-21 10:34:52,716 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:52,918 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 10:34:52,919 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:52,920 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-21 10:34:52,920 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:52,920 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 10:34:52,920 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 10:34:52,921 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=685, Invalid=1765, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 10:34:52,921 INFO L87 Difference]: Start difference. First operand 144 states and 155 transitions. Second operand 34 states. [2018-01-21 10:34:53,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:53,314 INFO L93 Difference]: Finished difference Result 288 states and 314 transitions. [2018-01-21 10:34:53,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 10:34:53,314 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 425 [2018-01-21 10:34:53,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:53,315 INFO L225 Difference]: With dead ends: 288 [2018-01-21 10:34:53,315 INFO L226 Difference]: Without dead ends: 152 [2018-01-21 10:34:53,317 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1732 GetRequests, 1666 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1321, Invalid=2969, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 10:34:53,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-01-21 10:34:53,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 149. [2018-01-21 10:34:53,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-01-21 10:34:53,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 160 transitions. [2018-01-21 10:34:53,325 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 160 transitions. Word has length 425 [2018-01-21 10:34:53,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:53,325 INFO L432 AbstractCegarLoop]: Abstraction has 149 states and 160 transitions. [2018-01-21 10:34:53,325 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 10:34:53,325 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 160 transitions. [2018-01-21 10:34:53,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2018-01-21 10:34:53,327 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:53,327 INFO L322 BasicCegarLoop]: trace histogram [80, 75, 75, 75, 75, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:53,327 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:53,327 INFO L82 PathProgramCache]: Analyzing trace with hash -877517212, now seen corresponding path program 15 times [2018-01-21 10:34:53,327 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:53,328 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:53,328 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:53,328 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:53,328 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:53,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:53,363 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:54,410 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 14 proven. 5315 refuted. 0 times theorem prover too weak. 9416 trivial. 0 not checked. [2018-01-21 10:34:54,411 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:54,411 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:54,411 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:54,411 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:54,411 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:54,411 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:54,418 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:54,419 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:54,450 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,453 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,457 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,461 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,467 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,472 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,476 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,481 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,488 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,496 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,503 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,510 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,519 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,529 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,539 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,555 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,566 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:54,567 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:54,574 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:54,932 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-21 10:34:54,932 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:55,194 WARN L143 SmtUtils]: Spent 194ms on a formula simplification that was a NOOP. DAG size: 55 [2018-01-21 10:34:56,082 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-21 10:34:56,115 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:56,115 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:56,119 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:56,119 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:56,162 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:56,174 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:56,194 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:56,242 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:56,302 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:56,417 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:56,608 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:56,897 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:57,352 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:58,253 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:58,893 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:59,842 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:11,882 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown