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_preciseopt.epf -i ../../../trunk/examples/svcomp/forester-heap/dll-optional_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 09:05:05,176 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 09:05:05,178 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 09:05:05,191 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 09:05:05,191 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 09:05:05,192 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 09:05:05,193 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 09:05:05,195 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 09:05:05,197 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 09:05:05,197 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 09:05:05,198 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 09:05:05,198 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 09:05:05,199 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 09:05:05,199 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 09:05:05,200 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 09:05:05,203 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 09:05:05,205 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 09:05:05,207 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 09:05:05,208 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 09:05:05,210 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 09:05:05,212 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 09:05:05,212 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 09:05:05,213 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 09:05:05,214 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 09:05:05,215 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 09:05:05,216 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 09:05:05,216 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 09:05:05,217 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 09:05:05,217 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 09:05:05,217 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 09:05:05,218 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 09:05:05,219 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_preciseopt.epf [2018-01-21 09:05:05,229 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 09:05:05,229 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 09:05:05,230 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 09:05:05,230 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 09:05:05,231 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 09:05:05,231 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 09:05:05,231 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 09:05:05,231 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 09:05:05,231 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 09:05:05,232 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 09:05:05,232 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 09:05:05,233 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 09:05:05,233 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 09:05:05,233 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 09:05:05,233 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 09:05:05,233 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 09:05:05,233 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 09:05:05,234 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 09:05:05,234 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 09:05:05,234 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 09:05:05,234 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 09:05:05,234 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 09:05:05,235 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 09:05:05,235 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 09:05:05,235 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 09:05:05,235 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 09:05:05,235 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 09:05:05,236 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 09:05:05,236 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 09:05:05,236 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 09:05:05,236 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 09:05:05,236 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 09:05:05,237 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 09:05:05,237 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 09:05:05,237 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 09:05:05,237 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 09:05:05,237 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 09:05:05,238 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 09:05:05,238 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 09:05:05,239 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 09:05:05,272 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 09:05:05,285 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 09:05:05,289 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 09:05:05,291 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 09:05:05,292 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 09:05:05,292 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/dll-optional_true-unreach-call_true-valid-memsafety.i [2018-01-21 09:05:05,468 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 09:05:05,473 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 09:05:05,474 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 09:05:05,474 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 09:05:05,479 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 09:05:05,479 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 09:05:05" (1/1) ... [2018-01-21 09:05:05,482 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39c1589c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05, skipping insertion in model container [2018-01-21 09:05:05,482 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 09:05:05" (1/1) ... [2018-01-21 09:05:05,495 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 09:05:05,535 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 09:05:05,664 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 09:05:05,684 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 09:05:05,691 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05 WrapperNode [2018-01-21 09:05:05,691 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 09:05:05,692 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 09:05:05,692 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 09:05:05,692 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 09:05:05,703 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05" (1/1) ... [2018-01-21 09:05:05,704 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05" (1/1) ... [2018-01-21 09:05:05,716 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05" (1/1) ... [2018-01-21 09:05:05,716 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05" (1/1) ... [2018-01-21 09:05:05,723 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05" (1/1) ... [2018-01-21 09:05:05,728 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05" (1/1) ... [2018-01-21 09:05:05,730 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05" (1/1) ... [2018-01-21 09:05:05,732 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 09:05:05,733 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 09:05:05,733 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 09:05:05,733 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 09:05:05,734 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05" (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 09:05:05,780 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 09:05:05,780 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 09:05:05,780 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 09:05:05,780 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 09:05:05,780 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 09:05:05,781 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 09:05:05,781 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 09:05:05,781 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 09:05:05,781 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 09:05:05,781 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 09:05:05,781 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 09:05:05,782 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 09:05:05,782 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 09:05:05,782 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 09:05:05,782 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 09:05:05,782 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 09:05:05,782 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 09:05:06,143 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 09:05:06,144 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 09:05:06 BoogieIcfgContainer [2018-01-21 09:05:06,144 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 09:05:06,145 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 09:05:06,145 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 09:05:06,148 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 09:05:06,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 09:05:05" (1/3) ... [2018-01-21 09:05:06,149 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c072597 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 09:05:06, skipping insertion in model container [2018-01-21 09:05:06,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:05" (2/3) ... [2018-01-21 09:05:06,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c072597 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 09:05:06, skipping insertion in model container [2018-01-21 09:05:06,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 09:05:06" (3/3) ... [2018-01-21 09:05:06,152 INFO L105 eAbstractionObserver]: Analyzing ICFG dll-optional_true-unreach-call_true-valid-memsafety.i [2018-01-21 09:05:06,161 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 09:05:06,170 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 09:05:06,221 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 09:05:06,221 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 09:05:06,247 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 09:05:06,247 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 09:05:06,247 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 09:05:06,248 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 09:05:06,248 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 09:05:06,248 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 09:05:06,249 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 09:05:06,275 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states. [2018-01-21 09:05:06,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 09:05:06,287 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:06,289 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 09:05:06,289 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 09:05:06,294 INFO L82 PathProgramCache]: Analyzing trace with hash 199372, now seen corresponding path program 1 times [2018-01-21 09:05:06,298 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:06,361 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:06,361 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:06,361 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:06,361 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:06,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:05:06,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:05:06,433 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 09:05:06,441 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:05:06,450 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 09:05:06,450 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 09:05:06,450 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 09:05:06,450 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 09:05:06,450 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 09:05:06,450 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 09:05:06,451 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 09:05:06,451 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 09:05:06,451 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 09:05:06,454 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states. [2018-01-21 09:05:06,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 09:05:06,456 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:06,456 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:06,456 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:05:06,456 INFO L82 PathProgramCache]: Analyzing trace with hash -2056818696, now seen corresponding path program 1 times [2018-01-21 09:05:06,457 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:06,457 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:06,458 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:06,458 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:06,458 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:06,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:06,497 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:06,643 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 09:05:06,645 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:06,645 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 09:05:06,645 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:06,648 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 09:05:06,659 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 09:05:06,659 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 09:05:06,661 INFO L87 Difference]: Start difference. First operand 88 states. Second operand 2 states. [2018-01-21 09:05:06,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:06,685 INFO L93 Difference]: Finished difference Result 128 states and 154 transitions. [2018-01-21 09:05:06,686 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 09:05:06,687 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 24 [2018-01-21 09:05:06,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:06,700 INFO L225 Difference]: With dead ends: 128 [2018-01-21 09:05:06,700 INFO L226 Difference]: Without dead ends: 85 [2018-01-21 09:05:06,704 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 09:05:06,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-01-21 09:05:06,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-01-21 09:05:06,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-01-21 09:05:06,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 95 transitions. [2018-01-21 09:05:06,739 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 95 transitions. Word has length 24 [2018-01-21 09:05:06,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:06,739 INFO L432 AbstractCegarLoop]: Abstraction has 85 states and 95 transitions. [2018-01-21 09:05:06,739 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 09:05:06,740 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 95 transitions. [2018-01-21 09:05:06,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 09:05:06,741 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:06,741 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:06,741 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:05:06,741 INFO L82 PathProgramCache]: Analyzing trace with hash -1534244515, now seen corresponding path program 1 times [2018-01-21 09:05:06,741 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:06,742 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:06,742 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:06,742 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:06,743 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:06,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:06,768 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:06,904 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 09:05:06,905 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:06,905 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 09:05:06,905 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:06,907 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 09:05:06,907 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 09:05:06,907 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 09:05:06,908 INFO L87 Difference]: Start difference. First operand 85 states and 95 transitions. Second operand 5 states. [2018-01-21 09:05:07,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:07,122 INFO L93 Difference]: Finished difference Result 148 states and 167 transitions. [2018-01-21 09:05:07,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 09:05:07,122 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2018-01-21 09:05:07,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:07,126 INFO L225 Difference]: With dead ends: 148 [2018-01-21 09:05:07,126 INFO L226 Difference]: Without dead ends: 132 [2018-01-21 09:05:07,127 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-01-21 09:05:07,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-01-21 09:05:07,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 89. [2018-01-21 09:05:07,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-01-21 09:05:07,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 99 transitions. [2018-01-21 09:05:07,136 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 99 transitions. Word has length 28 [2018-01-21 09:05:07,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:07,137 INFO L432 AbstractCegarLoop]: Abstraction has 89 states and 99 transitions. [2018-01-21 09:05:07,137 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 09:05:07,137 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 99 transitions. [2018-01-21 09:05:07,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-21 09:05:07,138 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:07,138 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:07,138 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:05:07,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1052367185, now seen corresponding path program 1 times [2018-01-21 09:05:07,138 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:07,139 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,139 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:07,139 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,139 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:07,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:07,167 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:07,245 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 09:05:07,245 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:07,246 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 09:05:07,246 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:07,246 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 09:05:07,246 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 09:05:07,246 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 09:05:07,247 INFO L87 Difference]: Start difference. First operand 89 states and 99 transitions. Second operand 5 states. [2018-01-21 09:05:07,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:07,323 INFO L93 Difference]: Finished difference Result 140 states and 158 transitions. [2018-01-21 09:05:07,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 09:05:07,323 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 49 [2018-01-21 09:05:07,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:07,325 INFO L225 Difference]: With dead ends: 140 [2018-01-21 09:05:07,325 INFO L226 Difference]: Without dead ends: 101 [2018-01-21 09:05:07,326 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-01-21 09:05:07,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-01-21 09:05:07,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 93. [2018-01-21 09:05:07,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-01-21 09:05:07,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 103 transitions. [2018-01-21 09:05:07,333 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 103 transitions. Word has length 49 [2018-01-21 09:05:07,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:07,334 INFO L432 AbstractCegarLoop]: Abstraction has 93 states and 103 transitions. [2018-01-21 09:05:07,334 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 09:05:07,334 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 103 transitions. [2018-01-21 09:05:07,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-01-21 09:05:07,335 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:07,335 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:07,335 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:05:07,335 INFO L82 PathProgramCache]: Analyzing trace with hash -280906860, now seen corresponding path program 1 times [2018-01-21 09:05:07,336 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:07,337 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,337 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:07,337 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,337 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:07,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:05:07,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:05:07,395 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 09:05:07,404 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:05:07,411 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:05:07,411 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:05:07,423 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 09:05:07,423 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 09:05:07,423 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 09:05:07,423 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 09:05:07,423 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 09:05:07,423 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 09:05:07,423 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 09:05:07,423 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 09:05:07,423 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 09:05:07,425 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states. [2018-01-21 09:05:07,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 09:05:07,425 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:07,425 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:07,425 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 09:05:07,426 INFO L82 PathProgramCache]: Analyzing trace with hash 1857075517, now seen corresponding path program 1 times [2018-01-21 09:05:07,426 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:07,426 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,426 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:07,427 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,427 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:07,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:07,437 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:07,450 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 09:05:07,450 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:07,450 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 09:05:07,450 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:07,451 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 09:05:07,451 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 09:05:07,451 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 09:05:07,451 INFO L87 Difference]: Start difference. First operand 88 states. Second operand 2 states. [2018-01-21 09:05:07,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:07,457 INFO L93 Difference]: Finished difference Result 128 states and 154 transitions. [2018-01-21 09:05:07,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 09:05:07,457 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-01-21 09:05:07,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:07,458 INFO L225 Difference]: With dead ends: 128 [2018-01-21 09:05:07,458 INFO L226 Difference]: Without dead ends: 83 [2018-01-21 09:05:07,459 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 09:05:07,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-01-21 09:05:07,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-01-21 09:05:07,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-01-21 09:05:07,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2018-01-21 09:05:07,463 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 22 [2018-01-21 09:05:07,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:07,463 INFO L432 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2018-01-21 09:05:07,464 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 09:05:07,464 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2018-01-21 09:05:07,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-21 09:05:07,464 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:07,464 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:07,464 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 09:05:07,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1003988962, now seen corresponding path program 1 times [2018-01-21 09:05:07,465 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:07,465 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,465 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:07,465 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,466 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:07,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:07,475 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:07,516 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 09:05:07,516 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:07,516 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 09:05:07,516 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:07,517 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 09:05:07,517 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 09:05:07,517 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 09:05:07,517 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand 5 states. [2018-01-21 09:05:07,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:07,708 INFO L93 Difference]: Finished difference Result 144 states and 162 transitions. [2018-01-21 09:05:07,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 09:05:07,709 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 26 [2018-01-21 09:05:07,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:07,711 INFO L225 Difference]: With dead ends: 144 [2018-01-21 09:05:07,711 INFO L226 Difference]: Without dead ends: 130 [2018-01-21 09:05:07,711 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-01-21 09:05:07,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-01-21 09:05:07,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 87. [2018-01-21 09:05:07,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-01-21 09:05:07,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 97 transitions. [2018-01-21 09:05:07,720 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 97 transitions. Word has length 26 [2018-01-21 09:05:07,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:07,721 INFO L432 AbstractCegarLoop]: Abstraction has 87 states and 97 transitions. [2018-01-21 09:05:07,721 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 09:05:07,721 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 97 transitions. [2018-01-21 09:05:07,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 09:05:07,722 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:07,723 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:07,723 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 09:05:07,723 INFO L82 PathProgramCache]: Analyzing trace with hash 68134102, now seen corresponding path program 1 times [2018-01-21 09:05:07,723 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:07,724 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,724 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:07,724 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,724 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:07,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:07,737 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:07,811 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 09:05:07,811 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:07,812 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 09:05:07,812 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:07,812 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 09:05:07,813 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 09:05:07,813 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 09:05:07,813 INFO L87 Difference]: Start difference. First operand 87 states and 97 transitions. Second operand 5 states. [2018-01-21 09:05:07,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:07,869 INFO L93 Difference]: Finished difference Result 136 states and 154 transitions. [2018-01-21 09:05:07,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 09:05:07,869 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 47 [2018-01-21 09:05:07,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:07,871 INFO L225 Difference]: With dead ends: 136 [2018-01-21 09:05:07,871 INFO L226 Difference]: Without dead ends: 99 [2018-01-21 09:05:07,872 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-01-21 09:05:07,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-01-21 09:05:07,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2018-01-21 09:05:07,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-01-21 09:05:07,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 101 transitions. [2018-01-21 09:05:07,880 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 101 transitions. Word has length 47 [2018-01-21 09:05:07,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:07,881 INFO L432 AbstractCegarLoop]: Abstraction has 91 states and 101 transitions. [2018-01-21 09:05:07,881 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 09:05:07,881 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 101 transitions. [2018-01-21 09:05:07,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-21 09:05:07,882 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:07,883 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:07,883 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 09:05:07,883 INFO L82 PathProgramCache]: Analyzing trace with hash -2109787175, now seen corresponding path program 1 times [2018-01-21 09:05:07,883 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:07,884 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,884 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:07,885 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:07,885 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:07,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:07,900 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:08,039 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 09:05:08,040 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 09:05:08,040 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 09:05:08,041 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 50 with the following transitions: [2018-01-21 09:05:08,042 INFO L201 CegarAbsIntRunner]: [0], [1], [2], [3], [4], [15], [18], [19], [20], [26], [30], [32], [35], [71], [75], [79], [81], [85], [86], [87], [94], [96], [104], [106], [111], [112], [113], [119], [123], [129], [130], [134], [138], [142], [144], [145], [146], [147], [155], [157], [161], [163], [164], [165], [171], [172], [173] [2018-01-21 09:05:08,091 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 09:05:08,091 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown