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/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:48:43,183 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:48:43,185 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:48:43,199 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:48:43,200 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:48:43,201 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:48:43,202 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:48:43,203 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:48:43,205 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:48:43,205 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:48:43,206 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:48:43,206 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:48:43,207 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:48:43,208 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:48:43,208 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:48:43,211 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:48:43,213 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:48:43,215 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:48:43,216 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:48:43,217 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:48:43,220 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 08:48:43,225 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:48:43,225 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:48:43,225 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 08:48:43,235 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:48:43,235 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:48:43,236 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:48:43,236 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:48:43,237 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:48:43,237 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:48:43,237 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:48:43,237 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:48:43,237 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:48:43,238 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:48:43,238 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:48:43,238 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:48:43,239 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:48:43,239 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:48:43,239 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:48:43,239 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:48:43,239 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:48:43,240 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:48:43,240 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:48:43,240 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:48:43,240 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:48:43,240 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:48:43,241 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:48:43,241 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:48:43,241 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:48:43,241 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:48:43,241 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:48:43,242 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:48:43,242 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:48:43,242 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:48:43,242 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:48:43,242 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:48:43,242 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:48:43,242 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:48:43,243 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:48:43,243 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:48:43,243 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:48:43,243 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:48:43,244 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:48:43,244 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:48:43,279 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:48:43,291 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:48:43,295 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:48:43,297 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:48:43,297 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:48:43,298 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c [2018-01-21 08:48:43,422 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:48:43,425 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:48:43,425 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:48:43,426 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:48:43,430 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:48:43,431 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:48:43" (1/1) ... [2018-01-21 08:48:43,434 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@784d9217 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43, skipping insertion in model container [2018-01-21 08:48:43,434 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:48:43" (1/1) ... [2018-01-21 08:48:43,446 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:48:43,460 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:48:43,569 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:48:43,586 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:48:43,592 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43 WrapperNode [2018-01-21 08:48:43,592 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:48:43,593 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:48:43,593 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:48:43,593 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:48:43,604 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43" (1/1) ... [2018-01-21 08:48:43,604 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43" (1/1) ... [2018-01-21 08:48:43,612 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43" (1/1) ... [2018-01-21 08:48:43,612 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43" (1/1) ... [2018-01-21 08:48:43,616 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43" (1/1) ... [2018-01-21 08:48:43,619 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43" (1/1) ... [2018-01-21 08:48:43,620 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43" (1/1) ... [2018-01-21 08:48:43,622 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:48:43,623 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:48:43,623 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:48:43,623 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:48:43,624 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43" (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 08:48:43,667 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:48:43,668 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:48:43,668 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 08:48:43,668 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:48:43,668 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:48:43,668 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:48:43,668 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:48:43,668 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:48:43,668 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:48:43,668 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 08:48:43,669 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:48:43,669 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:48:43,669 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:48:43,828 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:48:43,829 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:48:43 BoogieIcfgContainer [2018-01-21 08:48:43,829 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:48:43,829 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:48:43,829 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:48:43,831 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:48:43,832 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:48:43" (1/3) ... [2018-01-21 08:48:43,833 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25609414 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:48:43, skipping insertion in model container [2018-01-21 08:48:43,833 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:43" (2/3) ... [2018-01-21 08:48:43,834 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25609414 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:48:43, skipping insertion in model container [2018-01-21 08:48:43,834 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:48:43" (3/3) ... [2018-01-21 08:48:43,836 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_true-valid-memsafety.c [2018-01-21 08:48:43,842 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:48:43,848 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 08:48:43,885 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:48:43,885 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:48:43,885 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:48:43,885 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:48:43,886 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:48:43,886 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:48:43,886 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:48:43,886 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:48:43,887 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:48:43,908 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 08:48:43,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:48:43,914 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:43,915 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:48:43,915 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:48:43,921 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-21 08:48:43,923 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:43,964 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:43,964 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:43,964 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:43,964 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:43,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:48:43,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:48:44,040 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:48:44,046 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:48:44,051 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:48:44,051 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:48:44,051 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:48:44,052 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:48:44,052 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:48:44,052 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:48:44,052 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:48:44,052 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 08:48:44,052 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:48:44,053 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 08:48:44,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 08:48:44,054 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:44,054 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:44,055 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 08:48:44,055 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-21 08:48:44,055 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:44,056 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:44,056 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:44,056 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:44,056 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:44,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:44,080 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:44,110 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 08:48:44,112 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:44,112 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:48:44,112 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:44,114 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:48:44,124 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:48:44,124 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:48:44,127 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 08:48:44,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:44,156 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 08:48:44,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:48:44,157 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 08:48:44,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:44,165 INFO L225 Difference]: With dead ends: 78 [2018-01-21 08:48:44,166 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:48:44,169 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 08:48:44,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:48:44,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:48:44,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:48:44,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:48:44,261 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 08:48:44,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:44,261 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:48:44,261 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:48:44,261 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:48:44,261 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:48:44,263 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:48:44,264 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:48:44,264 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:48:44,264 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:48:44,264 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:48:44,264 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:48:44,264 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:48:44,264 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:48:44,264 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:48:44,265 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 08:48:44,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 08:48:44,266 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:44,267 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 08:48:44,267 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:44,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-21 08:48:44,267 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:44,268 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:44,268 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:44,268 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:44,268 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:44,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:44,277 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:44,289 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 08:48:44,289 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:44,289 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:48:44,289 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:44,289 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:48:44,289 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:48:44,290 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:48:44,290 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 08:48:44,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:44,295 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 08:48:44,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:48:44,295 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 08:48:44,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:44,297 INFO L225 Difference]: With dead ends: 78 [2018-01-21 08:48:44,297 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 08:48:44,298 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 08:48:44,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 08:48:44,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 08:48:44,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 08:48:44,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-21 08:48:44,308 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-21 08:48:44,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:44,309 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-21 08:48:44,309 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:48:44,309 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-21 08:48:44,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:48:44,310 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:44,310 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 08:48:44,310 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:44,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-21 08:48:44,310 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:44,311 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:44,311 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:44,311 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:44,311 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:44,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:44,324 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:44,357 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 08:48:44,357 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:44,357 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:48:44,357 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:44,358 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:48:44,359 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:48:44,359 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:48:44,359 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-21 08:48:44,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:44,411 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-21 08:48:44,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:48:44,412 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 08:48:44,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:44,416 INFO L225 Difference]: With dead ends: 73 [2018-01-21 08:48:44,416 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 08:48:44,417 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 08:48:44,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 08:48:44,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-21 08:48:44,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 08:48:44,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-21 08:48:44,428 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-21 08:48:44,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:44,429 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-21 08:48:44,429 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:48:44,429 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-21 08:48:44,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 08:48:44,430 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:44,431 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, 1, 1, 1] [2018-01-21 08:48:44,431 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:44,431 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-21 08:48:44,431 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:44,432 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:44,433 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:44,433 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:44,433 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:44,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:44,449 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:44,508 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:44,508 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:44,509 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:44,510 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-21 08:48:44,512 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 08:48:44,561 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:48:44,562 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:48:46,581 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:48:46,582 INFO L268 AbstractInterpreter]: Visited 33 different actions 57 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 21 variables. [2018-01-21 08:48:46,591 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:48:46,591 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:46,591 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 08:48:46,600 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:46,600 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:46,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:46,632 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:46,658 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:46,659 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:46,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:46,760 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:46,760 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 08:48:46,765 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:46,765 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:46,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:46,798 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:46,804 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:46,804 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:46,853 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:46,855 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:46,855 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 08:48:46,855 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:46,856 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 08:48:46,856 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 08:48:46,856 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:48:46,857 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-21 08:48:46,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:46,934 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2018-01-21 08:48:46,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:48:46,935 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-21 08:48:46,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:46,936 INFO L225 Difference]: With dead ends: 92 [2018-01-21 08:48:46,937 INFO L226 Difference]: Without dead ends: 74 [2018-01-21 08:48:46,937 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:48:46,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-01-21 08:48:46,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 56. [2018-01-21 08:48:46,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 08:48:46,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2018-01-21 08:48:46,946 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 34 [2018-01-21 08:48:46,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:46,947 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2018-01-21 08:48:46,947 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 08:48:46,947 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2018-01-21 08:48:46,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 08:48:46,949 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:46,950 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:46,950 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:46,950 INFO L82 PathProgramCache]: Analyzing trace with hash 284082524, now seen corresponding path program 2 times [2018-01-21 08:48:46,950 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:46,951 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:46,951 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:46,952 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:46,952 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:46,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:46,971 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:47,023 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 08:48:47,024 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:47,024 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:47,024 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:47,024 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:47,025 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:47,025 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 08:48:47,036 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:47,036 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:47,052 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:47,062 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:47,063 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:47,066 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:47,114 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 08:48:47,115 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:47,257 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 08:48:47,278 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 08:48:47,278 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-21 08:48:47,278 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:47,279 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:48:47,279 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:48:47,279 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-21 08:48:47,279 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand 6 states. [2018-01-21 08:48:47,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:47,408 INFO L93 Difference]: Finished difference Result 108 states and 119 transitions. [2018-01-21 08:48:47,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 08:48:47,408 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-21 08:48:47,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:47,409 INFO L225 Difference]: With dead ends: 108 [2018-01-21 08:48:47,410 INFO L226 Difference]: Without dead ends: 69 [2018-01-21 08:48:47,410 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 86 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 08:48:47,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-01-21 08:48:47,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 61. [2018-01-21 08:48:47,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-01-21 08:48:47,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2018-01-21 08:48:47,417 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 47 [2018-01-21 08:48:47,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:47,417 INFO L432 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2018-01-21 08:48:47,418 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:48:47,418 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2018-01-21 08:48:47,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 08:48:47,419 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:47,419 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:47,419 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:47,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1139762048, now seen corresponding path program 1 times [2018-01-21 08:48:47,419 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:47,420 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:47,420 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:47,420 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:47,421 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:47,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:47,442 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:47,497 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:48:47,498 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:47,498 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:47,498 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 53 with the following transitions: [2018-01-21 08:48:47,498 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 08:48:47,500 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:48:47,500 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:48:48,519 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:48:48,519 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 08:48:48,521 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:48:48,521 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:48,521 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:48,536 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:48,536 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:48,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:48,569 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:48,628 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:48:48,628 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:48,672 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:48:48,692 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:48,692 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 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 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:48,694 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:48,695 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:48,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:48,733 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:48,741 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:48:48,741 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:48,772 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:48:48,774 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:48,775 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 08:48:48,775 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:48,775 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:48:48,776 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:48:48,776 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 08:48:48,776 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand 6 states. [2018-01-21 08:48:48,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:48,848 INFO L93 Difference]: Finished difference Result 119 states and 133 transitions. [2018-01-21 08:48:48,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:48:48,849 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-21 08:48:48,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:48,850 INFO L225 Difference]: With dead ends: 119 [2018-01-21 08:48:48,850 INFO L226 Difference]: Without dead ends: 96 [2018-01-21 08:48:48,851 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 08:48:48,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-01-21 08:48:48,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 73. [2018-01-21 08:48:48,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-01-21 08:48:48,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 81 transitions. [2018-01-21 08:48:48,858 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 81 transitions. Word has length 52 [2018-01-21 08:48:48,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:48,859 INFO L432 AbstractCegarLoop]: Abstraction has 73 states and 81 transitions. [2018-01-21 08:48:48,859 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:48:48,859 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 81 transitions. [2018-01-21 08:48:48,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-01-21 08:48:48,860 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:48,860 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:48,860 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:48,860 INFO L82 PathProgramCache]: Analyzing trace with hash -2110418334, now seen corresponding path program 2 times [2018-01-21 08:48:48,860 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:48,861 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:48,861 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:48,861 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:48,861 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:48,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:48,883 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:48,954 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:48:48,954 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:48,954 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:48,954 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:48,954 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:48,954 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:48,955 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:48,960 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:48,961 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:48,975 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:48,986 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:48,991 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:48,995 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:49,142 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 08:48:49,143 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:49,365 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 08:48:49,392 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:49,392 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 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 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:49,398 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:49,399 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:49,411 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:49,427 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:49,439 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:49,445 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:49,468 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:48:49,468 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:49,524 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:48:49,525 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:49,525 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 08:48:49,526 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:49,526 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 08:48:49,526 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 08:48:49,527 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-21 08:48:49,527 INFO L87 Difference]: Start difference. First operand 73 states and 81 transitions. Second operand 12 states. [2018-01-21 08:48:49,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:49,756 INFO L93 Difference]: Finished difference Result 192 states and 218 transitions. [2018-01-21 08:48:49,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 08:48:49,757 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 70 [2018-01-21 08:48:49,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:49,758 INFO L225 Difference]: With dead ends: 192 [2018-01-21 08:48:49,759 INFO L226 Difference]: Without dead ends: 143 [2018-01-21 08:48:49,759 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 262 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-21 08:48:49,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-21 08:48:49,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 101. [2018-01-21 08:48:49,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-21 08:48:49,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 113 transitions. [2018-01-21 08:48:49,770 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 113 transitions. Word has length 70 [2018-01-21 08:48:49,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:49,770 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 113 transitions. [2018-01-21 08:48:49,771 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 08:48:49,771 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 113 transitions. [2018-01-21 08:48:49,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-01-21 08:48:49,773 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:49,773 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 5, 4, 4, 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, 1] [2018-01-21 08:48:49,773 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:49,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1934895936, now seen corresponding path program 3 times [2018-01-21 08:48:49,774 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:49,774 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:49,774 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:49,775 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:49,775 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:49,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:49,801 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:49,885 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-21 08:48:49,886 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:49,886 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:49,886 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:49,886 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:49,886 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:49,886 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:49,894 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:49,895 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:49,909 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:49,914 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:49,920 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:49,924 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:49,925 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:49,928 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:49,964 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 08:48:49,964 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:50,083 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 08:48:50,103 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:50,103 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 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 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:50,106 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:50,107 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:50,119 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:50,127 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:50,140 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:50,161 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:50,173 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:50,177 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:50,188 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 08:48:50,188 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:50,265 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 08:48:50,267 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:50,267 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-21 08:48:50,267 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:50,267 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 08:48:50,267 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 08:48:50,268 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:48:50,268 INFO L87 Difference]: Start difference. First operand 101 states and 113 transitions. Second operand 11 states. [2018-01-21 08:48:50,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:50,454 INFO L93 Difference]: Finished difference Result 239 states and 273 transitions. [2018-01-21 08:48:50,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 08:48:50,454 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 98 [2018-01-21 08:48:50,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:50,456 INFO L225 Difference]: With dead ends: 239 [2018-01-21 08:48:50,456 INFO L226 Difference]: Without dead ends: 206 [2018-01-21 08:48:50,457 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 380 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-21 08:48:50,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2018-01-21 08:48:50,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 142. [2018-01-21 08:48:50,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-01-21 08:48:50,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 162 transitions. [2018-01-21 08:48:50,468 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 162 transitions. Word has length 98 [2018-01-21 08:48:50,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:50,469 INFO L432 AbstractCegarLoop]: Abstraction has 142 states and 162 transitions. [2018-01-21 08:48:50,469 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 08:48:50,469 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 162 transitions. [2018-01-21 08:48:50,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-01-21 08:48:50,470 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:50,470 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 6, 5, 5, 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, 1] [2018-01-21 08:48:50,470 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:50,471 INFO L82 PathProgramCache]: Analyzing trace with hash -883540994, now seen corresponding path program 4 times [2018-01-21 08:48:50,471 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:50,471 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:50,471 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:50,471 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:50,471 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:50,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:50,500 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:50,687 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-21 08:48:50,687 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:50,687 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:50,687 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:50,688 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:50,688 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:50,688 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:50,695 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:50,695 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:50,726 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:50,730 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:50,875 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 08:48:50,875 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:51,034 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 08:48:51,054 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:51,054 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 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 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:51,057 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:51,057 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:51,107 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:51,113 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:51,139 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 08:48:51,139 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:51,264 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 08:48:51,266 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:51,266 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-21 08:48:51,266 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:51,266 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 08:48:51,267 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 08:48:51,267 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-21 08:48:51,267 INFO L87 Difference]: Start difference. First operand 142 states and 162 transitions. Second operand 18 states. [2018-01-21 08:48:51,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:51,655 INFO L93 Difference]: Finished difference Result 371 states and 427 transitions. [2018-01-21 08:48:51,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 08:48:51,655 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 131 [2018-01-21 08:48:51,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:51,657 INFO L225 Difference]: With dead ends: 371 [2018-01-21 08:48:51,658 INFO L226 Difference]: Without dead ends: 283 [2018-01-21 08:48:51,659 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 496 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-21 08:48:51,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-01-21 08:48:51,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 180. [2018-01-21 08:48:51,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 08:48:51,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 205 transitions. [2018-01-21 08:48:51,674 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 205 transitions. Word has length 131 [2018-01-21 08:48:51,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:51,675 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 205 transitions. [2018-01-21 08:48:51,675 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 08:48:51,675 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 205 transitions. [2018-01-21 08:48:51,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-01-21 08:48:51,679 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:51,679 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:51,679 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:51,679 INFO L82 PathProgramCache]: Analyzing trace with hash 1207261824, now seen corresponding path program 5 times [2018-01-21 08:48:51,680 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:51,680 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:51,680 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:51,681 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:51,681 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:51,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:51,712 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:51,870 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-21 08:48:51,870 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:51,870 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:51,870 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:51,870 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:51,871 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:51,871 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:51,880 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:51,880 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:51,895 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:51,902 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:51,908 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:51,913 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:51,920 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:51,928 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:51,930 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:51,935 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:52,077 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-21 08:48:52,078 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:52,302 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-21 08:48:52,328 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:52,328 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 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 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:52,331 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:52,331 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:52,342 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:52,347 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:52,358 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:52,371 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:52,393 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:52,721 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:52,745 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:52,751 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:52,780 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-21 08:48:52,780 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:53,008 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-21 08:48:53,010 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:53,010 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-21 08:48:53,010 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:53,011 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 08:48:53,011 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 08:48:53,011 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-21 08:48:53,011 INFO L87 Difference]: Start difference. First operand 180 states and 205 transitions. Second operand 18 states. [2018-01-21 08:48:53,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:53,468 INFO L93 Difference]: Finished difference Result 418 states and 475 transitions. [2018-01-21 08:48:53,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 08:48:53,468 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 164 [2018-01-21 08:48:53,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:53,470 INFO L225 Difference]: With dead ends: 418 [2018-01-21 08:48:53,470 INFO L226 Difference]: Without dead ends: 249 [2018-01-21 08:48:53,471 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 635 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 08:48:53,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-01-21 08:48:53,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 187. [2018-01-21 08:48:53,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-01-21 08:48:53,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 208 transitions. [2018-01-21 08:48:53,483 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 208 transitions. Word has length 164 [2018-01-21 08:48:53,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:53,483 INFO L432 AbstractCegarLoop]: Abstraction has 187 states and 208 transitions. [2018-01-21 08:48:53,483 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 08:48:53,484 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 208 transitions. [2018-01-21 08:48:53,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-01-21 08:48:53,486 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:53,486 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:53,486 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:53,487 INFO L82 PathProgramCache]: Analyzing trace with hash -1562233122, now seen corresponding path program 6 times [2018-01-21 08:48:53,487 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:53,488 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:53,488 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:53,488 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:53,488 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:53,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:53,522 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:53,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:48:53,702 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:53,702 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:53,702 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:53,702 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:53,702 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:53,702 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:53,708 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:53,708 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:53,722 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,724 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,727 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,731 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,735 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,740 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,745 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,752 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,762 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,764 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:53,769 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:53,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:48:53,795 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:53,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:48:53,927 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:53,927 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 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 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:53,930 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:53,930 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:53,949 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,956 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,970 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:53,991 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:54,044 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:54,208 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:55,577 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:56,009 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:08,044 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:08,102 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:08,121 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:08,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:49:08,143 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:08,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:49:08,220 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:08,220 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 08:49:08,220 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:08,220 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 08:49:08,220 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 08:49:08,221 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 08:49:08,221 INFO L87 Difference]: Start difference. First operand 187 states and 208 transitions. Second operand 11 states. [2018-01-21 08:49:08,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:08,352 INFO L93 Difference]: Finished difference Result 295 states and 329 transitions. [2018-01-21 08:49:08,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 08:49:08,352 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 202 [2018-01-21 08:49:08,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:08,353 INFO L225 Difference]: With dead ends: 295 [2018-01-21 08:49:08,354 INFO L226 Difference]: Without dead ends: 247 [2018-01-21 08:49:08,354 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 799 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 08:49:08,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-01-21 08:49:08,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 199. [2018-01-21 08:49:08,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-01-21 08:49:08,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 222 transitions. [2018-01-21 08:49:08,366 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 222 transitions. Word has length 202 [2018-01-21 08:49:08,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:08,366 INFO L432 AbstractCegarLoop]: Abstraction has 199 states and 222 transitions. [2018-01-21 08:49:08,366 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 08:49:08,366 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 222 transitions. [2018-01-21 08:49:08,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-01-21 08:49:08,369 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:08,369 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:08,369 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:08,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1505706396, now seen corresponding path program 7 times [2018-01-21 08:49:08,370 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:08,371 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:08,371 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:08,371 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:08,371 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:08,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:08,406 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:08,662 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-21 08:49:08,662 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:08,662 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:08,663 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:08,663 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:08,663 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:08,663 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:08,671 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:08,671 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:08,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:08,745 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:08,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-21 08:49:08,997 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:09,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-21 08:49:09,350 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:09,350 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 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 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:09,353 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:09,353 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:09,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:09,451 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:09,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-21 08:49:09,489 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:09,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-21 08:49:09,670 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:09,670 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-21 08:49:09,670 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:09,670 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 08:49:09,671 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 08:49:09,671 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-21 08:49:09,671 INFO L87 Difference]: Start difference. First operand 199 states and 222 transitions. Second operand 23 states. [2018-01-21 08:49:10,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:10,324 INFO L93 Difference]: Finished difference Result 498 states and 557 transitions. [2018-01-21 08:49:10,324 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 08:49:10,325 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 235 [2018-01-21 08:49:10,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:10,328 INFO L225 Difference]: With dead ends: 498 [2018-01-21 08:49:10,328 INFO L226 Difference]: Without dead ends: 390 [2018-01-21 08:49:10,329 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 907 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 08:49:10,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2018-01-21 08:49:10,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 242. [2018-01-21 08:49:10,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-01-21 08:49:10,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 271 transitions. [2018-01-21 08:49:10,349 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 271 transitions. Word has length 235 [2018-01-21 08:49:10,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:10,349 INFO L432 AbstractCegarLoop]: Abstraction has 242 states and 271 transitions. [2018-01-21 08:49:10,349 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 08:49:10,349 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 271 transitions. [2018-01-21 08:49:10,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2018-01-21 08:49:10,351 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:10,351 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:10,351 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:10,351 INFO L82 PathProgramCache]: Analyzing trace with hash 369611686, now seen corresponding path program 8 times [2018-01-21 08:49:10,351 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:10,352 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:10,352 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:10,352 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:10,352 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:10,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:10,379 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:10,612 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-21 08:49:10,612 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:10,612 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:10,612 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:10,612 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:10,612 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:10,612 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:10,617 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:10,617 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:10,634 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:10,664 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:10,669 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:10,675 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:10,895 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-21 08:49:10,896 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:11,271 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-21 08:49:11,293 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:11,293 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 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 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:11,296 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:11,296 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:11,322 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:11,386 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:11,441 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:11,451 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:11,526 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-21 08:49:11,527 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:11,772 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-21 08:49:11,774 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:11,774 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-21 08:49:11,774 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:11,775 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 08:49:11,775 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 08:49:11,775 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-21 08:49:11,775 INFO L87 Difference]: Start difference. First operand 242 states and 271 transitions. Second operand 26 states. [2018-01-21 08:49:12,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:12,371 INFO L93 Difference]: Finished difference Result 607 states and 679 transitions. [2018-01-21 08:49:12,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 08:49:12,371 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 288 [2018-01-21 08:49:12,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:12,374 INFO L225 Difference]: With dead ends: 607 [2018-01-21 08:49:12,374 INFO L226 Difference]: Without dead ends: 486 [2018-01-21 08:49:12,375 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1177 GetRequests, 1114 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 08:49:12,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2018-01-21 08:49:12,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 290. [2018-01-21 08:49:12,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2018-01-21 08:49:12,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 326 transitions. [2018-01-21 08:49:12,390 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 326 transitions. Word has length 288 [2018-01-21 08:49:12,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:12,391 INFO L432 AbstractCegarLoop]: Abstraction has 290 states and 326 transitions. [2018-01-21 08:49:12,391 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 08:49:12,391 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 326 transitions. [2018-01-21 08:49:12,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-01-21 08:49:12,392 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:12,393 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:12,393 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:12,393 INFO L82 PathProgramCache]: Analyzing trace with hash -292281344, now seen corresponding path program 9 times [2018-01-21 08:49:12,393 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:12,394 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:12,394 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:12,394 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:12,394 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:12,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:12,422 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:12,707 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-21 08:49:12,707 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:12,707 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:12,707 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:12,707 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:12,707 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:12,707 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:12,713 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:12,713 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:12,738 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:12,742 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:12,746 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:12,751 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:12,758 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:12,766 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:12,775 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:12,786 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:12,796 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:12,801 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:12,971 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 08:49:12,971 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:13,294 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 08:49:13,315 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:13,315 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 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 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:13,318 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:13,318 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:13,346 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:13,356 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:13,371 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:13,393 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:13,431 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:13,506 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:13,852 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:14,869 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:14,911 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:14,922 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:14,979 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 08:49:14,979 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:15,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 08:49:15,181 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:15,182 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-21 08:49:15,182 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:15,182 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 08:49:15,182 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 08:49:15,183 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-21 08:49:15,183 INFO L87 Difference]: Start difference. First operand 290 states and 326 transitions. Second operand 21 states. [2018-01-21 08:49:15,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:15,710 INFO L93 Difference]: Finished difference Result 697 states and 790 transitions. [2018-01-21 08:49:15,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 08:49:15,711 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 346 [2018-01-21 08:49:15,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:15,716 INFO L225 Difference]: With dead ends: 697 [2018-01-21 08:49:15,717 INFO L226 Difference]: Without dead ends: 634 [2018-01-21 08:49:15,718 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1402 GetRequests, 1364 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 08:49:15,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2018-01-21 08:49:15,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 351. [2018-01-21 08:49:15,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2018-01-21 08:49:15,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 400 transitions. [2018-01-21 08:49:15,744 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 400 transitions. Word has length 346 [2018-01-21 08:49:15,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:15,745 INFO L432 AbstractCegarLoop]: Abstraction has 351 states and 400 transitions. [2018-01-21 08:49:15,745 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 08:49:15,745 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 400 transitions. [2018-01-21 08:49:15,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2018-01-21 08:49:15,749 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:15,749 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:15,749 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:15,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1529949378, now seen corresponding path program 10 times [2018-01-21 08:49:15,749 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:15,750 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:15,750 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:15,750 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:15,751 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:15,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:15,794 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:16,344 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-21 08:49:16,344 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:16,345 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:16,345 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:16,345 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:16,345 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:16,345 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:16,353 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:16,353 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:16,455 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:16,463 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:16,784 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-21 08:49:16,784 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:17,258 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-21 08:49:17,278 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:17,278 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 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 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:17,281 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:17,281 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:17,429 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:17,443 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:17,545 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-21 08:49:17,545 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:17,855 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-21 08:49:17,857 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:17,858 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-21 08:49:17,858 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:17,859 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 08:49:17,859 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 08:49:17,859 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 08:49:17,859 INFO L87 Difference]: Start difference. First operand 351 states and 400 transitions. Second operand 32 states. [2018-01-21 08:49:18,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:18,642 INFO L93 Difference]: Finished difference Result 905 states and 1030 transitions. [2018-01-21 08:49:18,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 08:49:18,642 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 409 [2018-01-21 08:49:18,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:18,647 INFO L225 Difference]: With dead ends: 905 [2018-01-21 08:49:18,647 INFO L226 Difference]: Without dead ends: 744 [2018-01-21 08:49:18,650 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1667 GetRequests, 1588 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 08:49:18,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2018-01-21 08:49:18,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 409. [2018-01-21 08:49:18,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 409 states. [2018-01-21 08:49:18,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 464 transitions. [2018-01-21 08:49:18,683 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 464 transitions. Word has length 409 [2018-01-21 08:49:18,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:18,684 INFO L432 AbstractCegarLoop]: Abstraction has 409 states and 464 transitions. [2018-01-21 08:49:18,684 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 08:49:18,684 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 464 transitions. [2018-01-21 08:49:18,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 473 [2018-01-21 08:49:18,688 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:18,688 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:18,689 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:18,689 INFO L82 PathProgramCache]: Analyzing trace with hash 1199895744, now seen corresponding path program 11 times [2018-01-21 08:49:18,689 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:18,690 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:18,690 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:18,690 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:18,690 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:18,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:18,744 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:19,202 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-21 08:49:19,202 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:19,202 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:19,203 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:19,203 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:19,203 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:19,203 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:19,209 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:19,210 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:19,236 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:19,242 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:19,250 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:19,258 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:19,268 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:19,279 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:19,294 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:19,307 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:19,309 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:19,318 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:19,764 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 6406 proven. 313 refuted. 0 times theorem prover too weak. 4134 trivial. 0 not checked. [2018-01-21 08:49:19,765 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:21,781 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 1168 proven. 1655 refuted. 0 times theorem prover too weak. 8030 trivial. 0 not checked. [2018-01-21 08:49:21,803 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:21,804 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 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 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:21,807 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:21,807 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:21,842 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:21,859 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:21,904 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:22,040 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Received shutdown request... [2018-01-21 08:49:34,077 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown