java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf -i ../../../trunk/examples/svcomp/memsafety/960521-1_false-valid-deref.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:08:40,337 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:08:40,338 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:08:40,352 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:08:40,353 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:08:40,354 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:08:40,355 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:08:40,356 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:08:40,358 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:08:40,359 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:08:40,360 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:08:40,360 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:08:40,361 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:08:40,362 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:08:40,363 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:08:40,365 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:08:40,367 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:08:40,369 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:08:40,370 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:08:40,371 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:08:40,374 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 10:08:40,380 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf [2018-01-21 10:08:40,388 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:08:40,388 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:08:40,389 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:08:40,389 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:08:40,389 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:08:40,390 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:08:40,390 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:08:40,390 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:08:40,390 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:08:40,390 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:08:40,390 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:08:40,390 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:08:40,391 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:08:40,391 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:08:40,391 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:08:40,391 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:08:40,391 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:08:40,391 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:08:40,391 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:08:40,391 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:08:40,392 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:08:40,392 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:08:40,392 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:08:40,392 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:08:40,392 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:08:40,393 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:08:40,393 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:08:40,393 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:08:40,393 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:08:40,393 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:08:40,393 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:08:40,393 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:08:40,393 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:08:40,394 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:08:40,394 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:08:40,394 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:08:40,394 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:08:40,395 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:08:40,395 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:08:40,427 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:08:40,437 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:08:40,440 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:08:40,441 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:08:40,442 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:08:40,442 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/memsafety/960521-1_false-valid-deref.i [2018-01-21 10:08:40,620 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:08:40,625 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:08:40,626 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:08:40,626 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:08:40,631 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:08:40,632 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:08:40" (1/1) ... [2018-01-21 10:08:40,635 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e6c4eb1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40, skipping insertion in model container [2018-01-21 10:08:40,635 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:08:40" (1/1) ... [2018-01-21 10:08:40,650 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:08:40,687 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:08:40,806 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:08:40,824 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:08:40,831 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40 WrapperNode [2018-01-21 10:08:40,832 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:08:40,832 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:08:40,833 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:08:40,833 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:08:40,850 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40" (1/1) ... [2018-01-21 10:08:40,851 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40" (1/1) ... [2018-01-21 10:08:40,860 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40" (1/1) ... [2018-01-21 10:08:40,860 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40" (1/1) ... [2018-01-21 10:08:40,864 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40" (1/1) ... [2018-01-21 10:08:40,869 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40" (1/1) ... [2018-01-21 10:08:40,870 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40" (1/1) ... [2018-01-21 10:08:40,872 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:08:40,873 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:08:40,873 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:08:40,873 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:08:40,874 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:08:40,921 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:08:40,922 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:08:40,922 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 10:08:40,922 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:08:40,922 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:08:40,922 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:08:40,922 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:08:40,922 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:08:40,922 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:08:40,923 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 10:08:40,923 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 10:08:40,923 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 10:08:40,923 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:08:40,923 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:08:40,923 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:08:41,123 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:08:41,123 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:08:41 BoogieIcfgContainer [2018-01-21 10:08:41,124 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:08:41,124 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:08:41,124 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:08:41,126 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:08:41,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:08:40" (1/3) ... [2018-01-21 10:08:41,127 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73e9ad2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:08:41, skipping insertion in model container [2018-01-21 10:08:41,127 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:08:40" (2/3) ... [2018-01-21 10:08:41,127 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73e9ad2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:08:41, skipping insertion in model container [2018-01-21 10:08:41,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:08:41" (3/3) ... [2018-01-21 10:08:41,129 INFO L105 eAbstractionObserver]: Analyzing ICFG 960521-1_false-valid-deref.i [2018-01-21 10:08:41,136 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:08:41,142 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 10:08:41,193 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:08:41,193 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:08:41,193 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:08:41,193 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:08:41,193 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:08:41,194 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:08:41,194 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:08:41,194 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:08:41,195 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:08:41,215 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2018-01-21 10:08:41,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:08:41,221 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:41,222 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:08:41,223 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:08:41,228 INFO L82 PathProgramCache]: Analyzing trace with hash 90336, now seen corresponding path program 1 times [2018-01-21 10:08:41,231 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:41,274 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,274 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:41,274 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,274 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:41,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:08:41,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:08:41,344 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:08:41,353 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:08:41,366 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:08:41,367 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:08:41,367 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:08:41,367 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:08:41,367 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:08:41,367 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:08:41,367 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:08:41,367 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 10:08:41,368 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:08:41,369 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2018-01-21 10:08:41,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-21 10:08:41,371 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:41,371 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:41,371 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 10:08:41,371 INFO L82 PathProgramCache]: Analyzing trace with hash 935443697, now seen corresponding path program 1 times [2018-01-21 10:08:41,372 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:41,373 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,373 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:41,373 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,374 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:41,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:41,409 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:41,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:08:41,459 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:08:41,460 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:08:41,460 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:08:41,462 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:08:41,548 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:08:41,549 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:08:41,551 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 2 states. [2018-01-21 10:08:41,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:41,570 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2018-01-21 10:08:41,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:08:41,572 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2018-01-21 10:08:41,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:41,578 INFO L225 Difference]: With dead ends: 60 [2018-01-21 10:08:41,578 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 10:08:41,582 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:08:41,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 10:08:41,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 10:08:41,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 10:08:41,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 10:08:41,603 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 18 [2018-01-21 10:08:41,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:41,604 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 10:08:41,604 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:08:41,604 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 10:08:41,604 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 10:08:41,607 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:08:41,607 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:08:41,607 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:08:41,607 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:08:41,607 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:08:41,607 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:08:41,608 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:08:41,608 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:08:41,608 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:08:41,609 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2018-01-21 10:08:41,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 10:08:41,611 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:41,611 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:41,612 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:41,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1172106943, now seen corresponding path program 1 times [2018-01-21 10:08:41,612 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:41,613 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,613 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:41,613 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,614 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:41,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:41,635 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:41,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:08:41,662 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:08:41,662 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:08:41,662 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:08:41,663 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:08:41,663 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:08:41,663 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:08:41,664 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 2 states. [2018-01-21 10:08:41,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:41,669 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2018-01-21 10:08:41,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:08:41,669 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 27 [2018-01-21 10:08:41,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:41,673 INFO L225 Difference]: With dead ends: 60 [2018-01-21 10:08:41,673 INFO L226 Difference]: Without dead ends: 36 [2018-01-21 10:08:41,674 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:08:41,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-21 10:08:41,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-21 10:08:41,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-21 10:08:41,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-01-21 10:08:41,684 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2018-01-21 10:08:41,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:41,684 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-01-21 10:08:41,684 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:08:41,684 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-01-21 10:08:41,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-21 10:08:41,685 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:41,685 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:41,685 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:41,686 INFO L82 PathProgramCache]: Analyzing trace with hash -862637837, now seen corresponding path program 1 times [2018-01-21 10:08:41,686 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:41,687 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,687 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:41,687 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,687 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:41,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:41,710 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:41,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:08:41,773 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:08:41,773 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:08:41,774 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:08:41,776 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:08:41,776 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:08:41,776 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:08:41,777 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 3 states. [2018-01-21 10:08:41,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:41,829 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2018-01-21 10:08:41,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:08:41,830 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2018-01-21 10:08:41,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:41,831 INFO L225 Difference]: With dead ends: 58 [2018-01-21 10:08:41,831 INFO L226 Difference]: Without dead ends: 45 [2018-01-21 10:08:41,833 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:08:41,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-01-21 10:08:41,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 38. [2018-01-21 10:08:41,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 10:08:41,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-01-21 10:08:41,839 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 29 [2018-01-21 10:08:41,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:41,840 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-01-21 10:08:41,840 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:08:41,840 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-01-21 10:08:41,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 10:08:41,841 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:41,841 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] [2018-01-21 10:08:41,842 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:41,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1162981958, now seen corresponding path program 1 times [2018-01-21 10:08:41,842 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:41,843 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,843 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:41,843 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:41,843 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:41,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:41,863 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:41,919 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:08:41,920 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:08:41,920 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 10:08:41,920 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:08:41,920 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:08:41,921 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:08:41,921 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 10:08:41,921 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 5 states. [2018-01-21 10:08:42,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:42,067 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2018-01-21 10:08:42,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 10:08:42,068 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 33 [2018-01-21 10:08:42,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:42,069 INFO L225 Difference]: With dead ends: 64 [2018-01-21 10:08:42,069 INFO L226 Difference]: Without dead ends: 44 [2018-01-21 10:08:42,069 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-01-21 10:08:42,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-01-21 10:08:42,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 40. [2018-01-21 10:08:42,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 10:08:42,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2018-01-21 10:08:42,074 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2018-01-21 10:08:42,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:42,074 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2018-01-21 10:08:42,074 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:08:42,074 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2018-01-21 10:08:42,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 10:08:42,075 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:42,075 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:42,075 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:42,075 INFO L82 PathProgramCache]: Analyzing trace with hash -797934829, now seen corresponding path program 1 times [2018-01-21 10:08:42,076 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:42,076 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:42,076 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:42,076 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:42,077 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:42,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:42,098 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:42,161 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:08:42,161 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:42,161 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:42,163 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 38 with the following transitions: [2018-01-21 10:08:42,165 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [15], [19], [23], [26], [28], [29], [31], [35], [40], [41], [42], [43], [44], [45], [46], [47], [49], [52], [53], [54], [60], [61], [63], [64], [65], [66], [67], [68] [2018-01-21 10:08:42,225 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:08:42,226 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:08:50,330 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:08:50,332 INFO L268 AbstractInterpreter]: Visited 35 different actions 95 times. Merged at 21 different actions 55 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 28 variables. [2018-01-21 10:08:50,351 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:08:50,352 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:50,352 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:50,359 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:50,359 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:08:50,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:50,396 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:50,432 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:08:50,433 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:50,615 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:08:50,648 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:50,649 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:50,658 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:50,658 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:08:50,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:50,708 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:50,724 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:08:50,724 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:50,799 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:08:50,801 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:08:50,802 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6, 4, 4] total 14 [2018-01-21 10:08:50,802 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:08:50,803 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 10:08:50,803 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 10:08:50,803 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2018-01-21 10:08:50,803 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 8 states. [2018-01-21 10:08:51,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:51,060 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2018-01-21 10:08:51,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 10:08:51,061 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 37 [2018-01-21 10:08:51,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:51,062 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:08:51,062 INFO L226 Difference]: Without dead ends: 52 [2018-01-21 10:08:51,063 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2018-01-21 10:08:51,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-01-21 10:08:51,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2018-01-21 10:08:51,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 10:08:51,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2018-01-21 10:08:51,071 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 37 [2018-01-21 10:08:51,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:51,072 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2018-01-21 10:08:51,072 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 10:08:51,072 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2018-01-21 10:08:51,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-01-21 10:08:51,073 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:51,074 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:51,074 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:51,074 INFO L82 PathProgramCache]: Analyzing trace with hash 883379251, now seen corresponding path program 2 times [2018-01-21 10:08:51,074 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:51,075 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:51,075 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:51,075 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:51,076 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:51,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:51,095 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:51,178 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 10:08:51,178 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:51,179 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:51,179 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:08:51,179 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:08:51,179 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:51,179 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:51,186 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:08:51,186 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:08:51,206 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:51,211 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:51,212 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:51,216 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:51,269 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 10:08:51,270 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:51,378 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 10:08:51,399 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:51,399 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:51,405 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:08:51,405 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:08:51,432 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:51,479 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:51,492 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:51,498 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:51,512 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 10:08:51,512 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:51,583 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 10:08:51,585 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:08:51,585 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7, 5, 5] total 18 [2018-01-21 10:08:51,585 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:08:51,586 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:08:51,586 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:08:51,586 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=203, Unknown=0, NotChecked=0, Total=306 [2018-01-21 10:08:51,586 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 10 states. [2018-01-21 10:08:51,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:51,712 INFO L93 Difference]: Finished difference Result 84 states and 89 transitions. [2018-01-21 10:08:51,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 10:08:51,713 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 45 [2018-01-21 10:08:51,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:51,714 INFO L225 Difference]: With dead ends: 84 [2018-01-21 10:08:51,714 INFO L226 Difference]: Without dead ends: 60 [2018-01-21 10:08:51,715 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 167 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2018-01-21 10:08:51,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-01-21 10:08:51,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2018-01-21 10:08:51,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 10:08:51,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-01-21 10:08:51,720 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 45 [2018-01-21 10:08:51,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:51,721 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-01-21 10:08:51,721 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:08:51,721 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-01-21 10:08:51,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-01-21 10:08:51,722 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:51,723 INFO L322 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:51,723 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:51,723 INFO L82 PathProgramCache]: Analyzing trace with hash -2104023981, now seen corresponding path program 3 times [2018-01-21 10:08:51,723 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:51,724 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:51,724 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:08:51,724 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:51,724 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:51,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:51,739 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:51,878 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 10:08:51,878 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:51,878 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:51,878 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:08:51,879 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:08:51,879 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:51,879 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:51,884 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:08:51,884 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:08:51,900 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:51,905 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:51,913 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:51,918 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:51,918 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:51,921 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:51,945 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 10:08:51,945 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:52,036 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 10:08:52,070 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:52,071 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:52,075 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:08:52,075 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:08:52,108 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:52,163 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:52,209 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:52,258 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:52,270 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:52,275 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:52,282 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 10:08:52,282 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:52,307 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 10:08:52,308 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:08:52,309 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6, 6, 6] total 13 [2018-01-21 10:08:52,309 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:08:52,309 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 10:08:52,309 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 10:08:52,309 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-01-21 10:08:52,310 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 9 states. [2018-01-21 10:08:52,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:52,386 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2018-01-21 10:08:52,387 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 10:08:52,387 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 53 [2018-01-21 10:08:52,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:52,388 INFO L225 Difference]: With dead ends: 96 [2018-01-21 10:08:52,388 INFO L226 Difference]: Without dead ends: 68 [2018-01-21 10:08:52,388 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 211 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=168, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:08:52,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-01-21 10:08:52,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2018-01-21 10:08:52,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-01-21 10:08:52,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2018-01-21 10:08:52,393 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 53 [2018-01-21 10:08:52,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:52,393 INFO L432 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2018-01-21 10:08:52,393 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 10:08:52,393 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2018-01-21 10:08:52,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-01-21 10:08:52,394 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:52,394 INFO L322 BasicCegarLoop]: trace histogram [5, 5, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:52,394 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:52,394 INFO L82 PathProgramCache]: Analyzing trace with hash -807566477, now seen corresponding path program 4 times [2018-01-21 10:08:52,395 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:52,395 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:52,395 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:08:52,395 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:52,395 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:52,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:52,411 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:52,534 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 10:08:52,534 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:52,534 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:52,535 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:08:52,535 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:08:52,535 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:52,535 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:52,548 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:08:52,548 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:08:52,586 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:52,589 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:52,661 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 10:08:52,661 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:52,792 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 10:08:52,812 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:52,813 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:52,815 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:08:52,815 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:08:52,896 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:52,901 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:52,915 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 10:08:52,915 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:52,987 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 10:08:52,988 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:08:52,988 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 8, 9] total 20 [2018-01-21 10:08:52,988 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:08:52,989 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 10:08:52,989 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 10:08:52,989 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2018-01-21 10:08:52,989 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 14 states. [2018-01-21 10:08:53,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:53,069 INFO L93 Difference]: Finished difference Result 108 states and 113 transitions. [2018-01-21 10:08:53,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 10:08:53,069 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 61 [2018-01-21 10:08:53,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:53,070 INFO L225 Difference]: With dead ends: 108 [2018-01-21 10:08:53,071 INFO L226 Difference]: Without dead ends: 76 [2018-01-21 10:08:53,071 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 229 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=156, Invalid=264, Unknown=0, NotChecked=0, Total=420 [2018-01-21 10:08:53,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-01-21 10:08:53,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2018-01-21 10:08:53,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-01-21 10:08:53,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2018-01-21 10:08:53,078 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 61 [2018-01-21 10:08:53,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:53,078 INFO L432 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2018-01-21 10:08:53,078 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 10:08:53,079 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2018-01-21 10:08:53,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-01-21 10:08:53,080 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:53,080 INFO L322 BasicCegarLoop]: trace histogram [6, 6, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:53,080 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:53,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1638405741, now seen corresponding path program 5 times [2018-01-21 10:08:53,080 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:53,081 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:53,081 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:08:53,081 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:53,082 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:53,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:53,098 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:53,183 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 10:08:53,183 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:53,183 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:53,184 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:08:53,184 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:08:53,184 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:53,184 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:53,192 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:08:53,192 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:08:53,200 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,201 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,203 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,207 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,213 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,249 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,251 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:53,253 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:53,262 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 10:08:53,263 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:53,324 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 10:08:53,343 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:53,343 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:53,346 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:08:53,346 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:08:53,355 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,358 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,365 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,379 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,398 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,452 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:53,468 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:53,473 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:53,483 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 10:08:53,483 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:53,521 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 10:08:53,522 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:08:53,523 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8, 8, 8] total 17 [2018-01-21 10:08:53,523 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:08:53,523 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 10:08:53,523 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 10:08:53,523 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:08:53,524 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 11 states. [2018-01-21 10:08:53,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:53,617 INFO L93 Difference]: Finished difference Result 120 states and 125 transitions. [2018-01-21 10:08:53,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 10:08:53,617 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 69 [2018-01-21 10:08:53,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:53,618 INFO L225 Difference]: With dead ends: 120 [2018-01-21 10:08:53,618 INFO L226 Difference]: Without dead ends: 84 [2018-01-21 10:08:53,618 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 275 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=200, Invalid=306, Unknown=0, NotChecked=0, Total=506 [2018-01-21 10:08:53,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-01-21 10:08:53,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 80. [2018-01-21 10:08:53,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-01-21 10:08:53,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-01-21 10:08:53,624 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 69 [2018-01-21 10:08:53,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:53,624 INFO L432 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-01-21 10:08:53,624 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 10:08:53,624 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-01-21 10:08:53,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-01-21 10:08:53,625 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:53,625 INFO L322 BasicCegarLoop]: trace histogram [7, 7, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:53,625 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:53,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1138501965, now seen corresponding path program 6 times [2018-01-21 10:08:53,626 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:53,626 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:53,626 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:08:53,626 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:53,626 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:53,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:53,644 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:53,736 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-01-21 10:08:53,736 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:53,736 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:53,737 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:08:53,737 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:08:53,737 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:53,737 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:53,742 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:08:53,742 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:08:53,754 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:53,758 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:53,760 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:53,764 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:53,771 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:53,797 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:53,809 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:53,810 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:53,812 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:53,903 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 22 proven. 72 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 10:08:53,903 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:54,025 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-01-21 10:08:54,045 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:54,045 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:54,048 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:08:54,048 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:08:54,068 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:54,108 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:54,156 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:54,201 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:54,261 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:54,347 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:54,428 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:08:54,443 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:54,447 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:54,520 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-01-21 10:08:54,520 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:54,710 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-01-21 10:08:54,711 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:08:54,711 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 9, 10, 11] total 43 [2018-01-21 10:08:54,712 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:08:54,712 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 10:08:54,712 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 10:08:54,713 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=610, Invalid=1196, Unknown=0, NotChecked=0, Total=1806 [2018-01-21 10:08:54,713 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 21 states. [2018-01-21 10:08:54,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:54,823 INFO L93 Difference]: Finished difference Result 138 states and 145 transitions. [2018-01-21 10:08:54,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 10:08:54,824 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 77 [2018-01-21 10:08:54,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:54,827 INFO L225 Difference]: With dead ends: 138 [2018-01-21 10:08:54,827 INFO L226 Difference]: Without dead ends: 98 [2018-01-21 10:08:54,828 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 274 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=652, Invalid=1240, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 10:08:54,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2018-01-21 10:08:54,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 92. [2018-01-21 10:08:54,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-01-21 10:08:54,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2018-01-21 10:08:54,837 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 77 [2018-01-21 10:08:54,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:54,838 INFO L432 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2018-01-21 10:08:54,838 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 10:08:54,838 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2018-01-21 10:08:54,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-01-21 10:08:54,839 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:54,839 INFO L322 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:54,839 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:54,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1493422676, now seen corresponding path program 7 times [2018-01-21 10:08:54,840 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:54,841 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:54,841 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:08:54,841 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:54,841 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:54,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:54,859 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:55,018 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:08:55,018 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:55,019 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:55,019 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:08:55,019 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:08:55,019 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:55,019 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:55,036 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:55,036 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:08:55,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:55,062 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:55,160 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:08:55,161 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:55,541 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:08:55,562 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:55,562 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:55,564 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:55,565 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:08:55,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:55,612 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:55,623 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:08:55,623 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:55,751 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:08:55,753 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:08:55,753 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13, 12, 13] total 32 [2018-01-21 10:08:55,753 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:08:55,753 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 10:08:55,754 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 10:08:55,754 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2018-01-21 10:08:55,754 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 22 states. [2018-01-21 10:08:55,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:55,928 INFO L93 Difference]: Finished difference Result 152 states and 158 transitions. [2018-01-21 10:08:55,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 10:08:55,929 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 89 [2018-01-21 10:08:55,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:55,932 INFO L225 Difference]: With dead ends: 152 [2018-01-21 10:08:55,932 INFO L226 Difference]: Without dead ends: 108 [2018-01-21 10:08:55,932 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 333 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=398, Invalid=658, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 10:08:55,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-01-21 10:08:55,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 104. [2018-01-21 10:08:55,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-01-21 10:08:55,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2018-01-21 10:08:55,941 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 89 [2018-01-21 10:08:55,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:55,941 INFO L432 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2018-01-21 10:08:55,941 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 10:08:55,941 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2018-01-21 10:08:55,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-01-21 10:08:55,942 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:55,942 INFO L322 BasicCegarLoop]: trace histogram [10, 10, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:55,942 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:55,943 INFO L82 PathProgramCache]: Analyzing trace with hash -698890221, now seen corresponding path program 8 times [2018-01-21 10:08:55,943 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:55,943 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:55,944 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:08:55,944 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:55,944 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:55,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:55,966 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:56,086 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 10:08:56,086 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:56,086 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:56,086 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:08:56,086 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:08:56,086 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:56,086 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:56,091 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:08:56,092 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:08:56,105 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:56,113 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:56,114 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:56,116 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:56,230 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 10:08:56,230 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:56,487 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 10:08:56,509 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:56,509 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:56,512 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:08:56,512 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:08:56,534 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:56,591 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:08:56,610 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:56,616 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:56,629 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 10:08:56,629 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:56,755 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 10:08:56,756 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:08:56,757 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14, 13, 14] total 35 [2018-01-21 10:08:56,757 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:08:56,757 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 10:08:56,757 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 10:08:56,758 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=748, Unknown=0, NotChecked=0, Total=1190 [2018-01-21 10:08:56,758 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 24 states. [2018-01-21 10:08:56,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:56,882 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2018-01-21 10:08:56,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 10:08:56,882 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 101 [2018-01-21 10:08:56,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:56,883 INFO L225 Difference]: With dead ends: 168 [2018-01-21 10:08:56,883 INFO L226 Difference]: Without dead ends: 116 [2018-01-21 10:08:56,885 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 379 SyntacticMatches, 4 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=476, Invalid=784, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 10:08:56,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2018-01-21 10:08:56,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 112. [2018-01-21 10:08:56,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-01-21 10:08:56,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2018-01-21 10:08:56,891 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 101 [2018-01-21 10:08:56,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:56,891 INFO L432 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2018-01-21 10:08:56,891 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 10:08:56,891 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2018-01-21 10:08:56,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-01-21 10:08:56,892 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:56,892 INFO L322 BasicCegarLoop]: trace histogram [11, 11, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:56,892 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:56,892 INFO L82 PathProgramCache]: Analyzing trace with hash -745483981, now seen corresponding path program 9 times [2018-01-21 10:08:56,892 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:56,893 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:56,893 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:08:56,893 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:56,893 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:56,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:56,910 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:57,128 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 10:08:57,128 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:57,128 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:57,128 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:08:57,128 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:08:57,128 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:57,128 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:57,134 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:08:57,134 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:08:57,151 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,154 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,157 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,162 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,167 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,177 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,187 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,204 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,237 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,310 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,332 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,333 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:57,336 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:57,350 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 10:08:57,350 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:57,509 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 10:08:57,545 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:57,545 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:57,550 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:08:57,551 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:08:57,582 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,628 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,680 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,739 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,811 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:57,901 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:58,010 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:58,143 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:58,296 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:58,495 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:58,744 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:08:58,771 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:58,777 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:58,787 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 10:08:58,787 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:58,810 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 10:08:58,811 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:08:58,812 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13, 13, 13] total 27 [2018-01-21 10:08:58,812 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:08:58,812 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 10:08:58,812 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 10:08:58,812 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=398, Unknown=0, NotChecked=0, Total=702 [2018-01-21 10:08:58,813 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand 16 states. [2018-01-21 10:08:58,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:08:58,972 INFO L93 Difference]: Finished difference Result 180 states and 185 transitions. [2018-01-21 10:08:59,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 10:08:59,004 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2018-01-21 10:08:59,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:08:59,005 INFO L225 Difference]: With dead ends: 180 [2018-01-21 10:08:59,005 INFO L226 Difference]: Without dead ends: 124 [2018-01-21 10:08:59,005 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=580, Invalid=826, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:08:59,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-01-21 10:08:59,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2018-01-21 10:08:59,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-01-21 10:08:59,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 122 transitions. [2018-01-21 10:08:59,013 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 122 transitions. Word has length 109 [2018-01-21 10:08:59,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:08:59,014 INFO L432 AbstractCegarLoop]: Abstraction has 120 states and 122 transitions. [2018-01-21 10:08:59,014 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 10:08:59,014 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 122 transitions. [2018-01-21 10:08:59,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-01-21 10:08:59,015 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:08:59,015 INFO L322 BasicCegarLoop]: trace histogram [12, 12, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:08:59,015 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:08:59,015 INFO L82 PathProgramCache]: Analyzing trace with hash 1047454035, now seen corresponding path program 10 times [2018-01-21 10:08:59,015 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:08:59,016 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:59,016 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:08:59,016 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:08:59,016 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:08:59,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:08:59,031 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:08:59,174 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 10:08:59,175 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:59,175 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:08:59,175 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:08:59,175 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:08:59,175 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:59,175 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:08:59,180 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:08:59,180 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:08:59,426 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:08:59,429 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:08:59,550 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 10:08:59,550 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:08:59,916 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 10:08:59,936 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:08:59,936 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:08:59,939 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:08:59,939 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:09:00,085 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:00,091 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:00,108 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 10:09:00,108 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:00,275 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 10:09:00,277 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:09:00,277 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 16, 15, 16] total 41 [2018-01-21 10:09:00,277 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:09:00,277 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 10:09:00,278 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 10:09:00,278 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=613, Invalid=1027, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 10:09:00,278 INFO L87 Difference]: Start difference. First operand 120 states and 122 transitions. Second operand 28 states. [2018-01-21 10:09:00,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:09:00,424 INFO L93 Difference]: Finished difference Result 192 states and 197 transitions. [2018-01-21 10:09:00,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-01-21 10:09:00,424 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 117 [2018-01-21 10:09:00,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:09:00,425 INFO L225 Difference]: With dead ends: 192 [2018-01-21 10:09:00,426 INFO L226 Difference]: Without dead ends: 132 [2018-01-21 10:09:00,426 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 439 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=653, Invalid=1069, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 10:09:00,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-01-21 10:09:00,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 128. [2018-01-21 10:09:00,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-01-21 10:09:00,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 130 transitions. [2018-01-21 10:09:00,433 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 130 transitions. Word has length 117 [2018-01-21 10:09:00,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:09:00,434 INFO L432 AbstractCegarLoop]: Abstraction has 128 states and 130 transitions. [2018-01-21 10:09:00,434 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 10:09:00,434 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 130 transitions. [2018-01-21 10:09:00,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-01-21 10:09:00,434 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:09:00,434 INFO L322 BasicCegarLoop]: trace histogram [13, 13, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:09:00,435 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:09:00,435 INFO L82 PathProgramCache]: Analyzing trace with hash 244283507, now seen corresponding path program 11 times [2018-01-21 10:09:00,435 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:09:00,435 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:00,435 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:09:00,436 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:00,436 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:09:00,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:09:00,453 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:09:00,613 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 10:09:00,613 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:00,613 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:09:00,613 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:09:00,613 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:09:00,613 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:00,614 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:09:00,619 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:09:00,619 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:09:00,627 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,628 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,630 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,633 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,637 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,643 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,697 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,720 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,756 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,813 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:00,983 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:01,073 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,369 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,377 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:03,383 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:03,398 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 10:09:03,398 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:03,629 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 10:09:03,651 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:03,651 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:09:03,654 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:09:03,654 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:09:03,664 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,667 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,675 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,686 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,703 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,729 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,795 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,879 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:03,992 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:04,142 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:04,665 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:05,372 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:06,302 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:06,341 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:06,347 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:06,358 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 10:09:06,358 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:06,384 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 10:09:06,386 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:09:06,386 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 15, 15, 15] total 31 [2018-01-21 10:09:06,386 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:09:06,386 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 10:09:06,387 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 10:09:06,387 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=520, Unknown=0, NotChecked=0, Total=930 [2018-01-21 10:09:06,387 INFO L87 Difference]: Start difference. First operand 128 states and 130 transitions. Second operand 18 states. [2018-01-21 10:09:06,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:09:06,558 INFO L93 Difference]: Finished difference Result 204 states and 209 transitions. [2018-01-21 10:09:06,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 10:09:06,558 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 125 [2018-01-21 10:09:06,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:09:06,559 INFO L225 Difference]: With dead ends: 204 [2018-01-21 10:09:06,559 INFO L226 Difference]: Without dead ends: 140 [2018-01-21 10:09:06,560 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=788, Invalid=1104, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 10:09:06,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2018-01-21 10:09:06,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 136. [2018-01-21 10:09:06,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-01-21 10:09:06,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2018-01-21 10:09:06,566 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 125 [2018-01-21 10:09:06,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:09:06,566 INFO L432 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2018-01-21 10:09:06,566 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 10:09:06,566 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2018-01-21 10:09:06,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-01-21 10:09:06,566 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:09:06,567 INFO L322 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:09:06,567 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:09:06,567 INFO L82 PathProgramCache]: Analyzing trace with hash -1479534957, now seen corresponding path program 12 times [2018-01-21 10:09:06,567 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:09:06,567 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:06,568 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:09:06,568 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:06,568 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:09:06,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:09:06,581 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:09:06,815 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2018-01-21 10:09:06,815 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:06,815 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:09:06,815 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:09:06,815 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:09:06,815 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:06,815 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:09:06,820 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:09:06,821 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:09:06,839 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:06,843 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:06,845 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:06,849 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:06,860 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:06,885 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:06,920 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:06,982 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:07,028 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:07,169 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:07,332 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:07,394 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:07,726 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:08,044 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:08,046 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:08,051 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:08,310 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 50 proven. 338 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 10:09:08,310 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:08,559 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2018-01-21 10:09:08,580 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:08,580 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:09:08,583 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:09:08,583 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:09:08,608 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:08,648 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:08,693 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:08,744 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:08,805 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:08,882 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:08,996 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:09,336 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:10,794 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:10,978 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:11,194 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:11,445 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:11,747 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:12,054 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:09:12,084 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:12,091 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:12,293 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2018-01-21 10:09:12,294 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:12,866 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2018-01-21 10:09:12,868 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:09:12,868 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 16, 17, 18] total 78 [2018-01-21 10:09:12,868 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:09:12,869 INFO L409 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-01-21 10:09:12,869 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-01-21 10:09:12,870 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2129, Invalid=3877, Unknown=0, NotChecked=0, Total=6006 [2018-01-21 10:09:12,870 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand 35 states. [2018-01-21 10:09:13,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:09:13,085 INFO L93 Difference]: Finished difference Result 222 states and 229 transitions. [2018-01-21 10:09:13,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 10:09:13,086 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 133 [2018-01-21 10:09:13,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:09:13,087 INFO L225 Difference]: With dead ends: 222 [2018-01-21 10:09:13,087 INFO L226 Difference]: Without dead ends: 154 [2018-01-21 10:09:13,089 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 549 GetRequests, 470 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3264 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2206, Invalid=3956, Unknown=0, NotChecked=0, Total=6162 [2018-01-21 10:09:13,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-01-21 10:09:13,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 148. [2018-01-21 10:09:13,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-01-21 10:09:13,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2018-01-21 10:09:13,097 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 133 [2018-01-21 10:09:13,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:09:13,097 INFO L432 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2018-01-21 10:09:13,097 INFO L433 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-01-21 10:09:13,097 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2018-01-21 10:09:13,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-01-21 10:09:13,098 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:09:13,098 INFO L322 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:09:13,098 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:09:13,098 INFO L82 PathProgramCache]: Analyzing trace with hash 144261004, now seen corresponding path program 13 times [2018-01-21 10:09:13,098 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:09:13,099 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:13,099 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:09:13,099 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:13,099 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:09:13,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:09:13,118 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:09:13,492 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 10:09:13,492 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:13,492 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:09:13,492 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:09:13,492 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:09:13,492 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:13,493 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:09:13,500 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:09:13,500 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:09:13,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:09:13,543 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:13,829 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 10:09:13,829 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:14,307 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 10:09:14,327 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:14,327 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:09:14,330 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:09:14,330 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:09:14,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:09:14,398 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:14,432 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 10:09:14,432 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:14,673 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 10:09:14,674 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:09:14,715 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 20, 19, 20] total 53 [2018-01-21 10:09:14,716 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:09:14,716 INFO L409 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-01-21 10:09:14,716 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-01-21 10:09:14,717 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1717, Unknown=0, NotChecked=0, Total=2756 [2018-01-21 10:09:14,717 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand 36 states. [2018-01-21 10:09:14,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:09:14,959 INFO L93 Difference]: Finished difference Result 236 states and 242 transitions. [2018-01-21 10:09:14,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 10:09:14,960 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 145 [2018-01-21 10:09:14,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:09:14,961 INFO L225 Difference]: With dead ends: 236 [2018-01-21 10:09:14,961 INFO L226 Difference]: Without dead ends: 164 [2018-01-21 10:09:14,962 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 599 GetRequests, 543 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1172 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1091, Invalid=1771, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 10:09:14,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-01-21 10:09:14,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 160. [2018-01-21 10:09:14,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-01-21 10:09:14,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 162 transitions. [2018-01-21 10:09:14,967 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 162 transitions. Word has length 145 [2018-01-21 10:09:14,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:09:14,968 INFO L432 AbstractCegarLoop]: Abstraction has 160 states and 162 transitions. [2018-01-21 10:09:14,968 INFO L433 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-01-21 10:09:14,968 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 162 transitions. [2018-01-21 10:09:14,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-01-21 10:09:14,968 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:09:14,968 INFO L322 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:09:14,968 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:09:14,969 INFO L82 PathProgramCache]: Analyzing trace with hash -927393037, now seen corresponding path program 14 times [2018-01-21 10:09:14,969 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:09:14,969 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:14,969 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:09:14,969 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:14,969 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:09:14,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:09:14,989 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:09:15,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 10:09:15,210 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:15,211 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:09:15,211 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:09:15,211 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:09:15,211 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:15,211 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:09:15,216 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:09:15,216 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:09:15,230 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:15,242 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:15,244 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:15,248 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:15,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 10:09:15,576 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:16,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 10:09:16,202 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:16,202 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:09:16,205 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:09:16,205 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:09:16,226 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:16,280 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:16,302 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:16,308 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:16,341 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 10:09:16,341 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:16,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 10:09:16,575 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:09:16,575 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21, 20, 21] total 56 [2018-01-21 10:09:16,575 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:09:16,576 INFO L409 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-01-21 10:09:16,576 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-01-21 10:09:16,577 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1163, Invalid=1917, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 10:09:16,577 INFO L87 Difference]: Start difference. First operand 160 states and 162 transitions. Second operand 38 states. [2018-01-21 10:09:16,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:09:16,782 INFO L93 Difference]: Finished difference Result 252 states and 257 transitions. [2018-01-21 10:09:16,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 10:09:16,782 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 157 [2018-01-21 10:09:16,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:09:16,783 INFO L225 Difference]: With dead ends: 252 [2018-01-21 10:09:16,783 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 10:09:16,784 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 648 GetRequests, 589 SyntacticMatches, 4 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1322 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1218, Invalid=1974, Unknown=0, NotChecked=0, Total=3192 [2018-01-21 10:09:16,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 10:09:16,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 168. [2018-01-21 10:09:16,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-01-21 10:09:16,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2018-01-21 10:09:16,790 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 157 [2018-01-21 10:09:16,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:09:16,790 INFO L432 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2018-01-21 10:09:16,790 INFO L433 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-01-21 10:09:16,790 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2018-01-21 10:09:16,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-01-21 10:09:16,791 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:09:16,791 INFO L322 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:09:16,791 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:09:16,791 INFO L82 PathProgramCache]: Analyzing trace with hash -2111777517, now seen corresponding path program 15 times [2018-01-21 10:09:16,791 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:09:16,791 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:16,792 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:09:16,792 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:16,792 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:09:16,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:09:16,805 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:09:17,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2018-01-21 10:09:17,066 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:17,066 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:09:17,066 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:09:17,066 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:09:17,066 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:17,066 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:09:17,072 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:09:17,072 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:09:17,097 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,106 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,109 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,114 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,118 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,126 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,139 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,158 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,175 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,263 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,341 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,419 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,464 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,541 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:17,886 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:18,112 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:18,381 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:18,776 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:18,778 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:18,783 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:19,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2018-01-21 10:09:19,016 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:19,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-01-21 10:09:19,722 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:19,740 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:09:19,743 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:09:19,744 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:09:19,773 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:19,815 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:19,859 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:19,909 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:19,975 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:20,058 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:20,165 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:20,301 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:20,455 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:20,654 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:20,902 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:21,208 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:21,533 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:21,964 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:22,563 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:23,181 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:23,789 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:24,534 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:09:24,576 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:24,582 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:24,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2018-01-21 10:09:24,606 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:24,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2018-01-21 10:09:24,929 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:09:24,963 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 25, 20, 20] total 81 [2018-01-21 10:09:24,963 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:09:24,963 INFO L409 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-01-21 10:09:24,964 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-01-21 10:09:24,965 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2362, Invalid=4118, Unknown=0, NotChecked=0, Total=6480 [2018-01-21 10:09:24,965 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand 40 states. [2018-01-21 10:09:25,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:09:25,148 INFO L93 Difference]: Finished difference Result 264 states and 269 transitions. [2018-01-21 10:09:25,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 10:09:25,149 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 165 [2018-01-21 10:09:25,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:09:25,150 INFO L225 Difference]: With dead ends: 264 [2018-01-21 10:09:25,150 INFO L226 Difference]: Without dead ends: 180 [2018-01-21 10:09:25,152 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 599 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3174 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2442, Invalid=4200, Unknown=0, NotChecked=0, Total=6642 [2018-01-21 10:09:25,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-01-21 10:09:25,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 176. [2018-01-21 10:09:25,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-01-21 10:09:25,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 178 transitions. [2018-01-21 10:09:25,160 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 178 transitions. Word has length 165 [2018-01-21 10:09:25,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:09:25,160 INFO L432 AbstractCegarLoop]: Abstraction has 176 states and 178 transitions. [2018-01-21 10:09:25,160 INFO L433 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-01-21 10:09:25,160 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 178 transitions. [2018-01-21 10:09:25,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-01-21 10:09:25,162 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:09:25,162 INFO L322 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:09:25,162 INFO L371 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:09:25,162 INFO L82 PathProgramCache]: Analyzing trace with hash -272886221, now seen corresponding path program 16 times [2018-01-21 10:09:25,162 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:09:25,163 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:25,163 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:09:25,163 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:25,163 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:09:25,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:09:25,181 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:09:25,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 10:09:25,478 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:25,478 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:09:25,478 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:09:25,478 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:09:25,478 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:25,478 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:09:25,483 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:09:25,483 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:09:26,761 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:26,765 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:26,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 10:09:26,966 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:27,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 10:09:27,616 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:27,616 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 33 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 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:09:27,619 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:09:27,619 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:09:27,914 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:09:27,920 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:09:27,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 10:09:27,948 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:09:28,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 10:09:28,211 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:09:28,211 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 23, 22, 23] total 62 [2018-01-21 10:09:28,211 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:09:28,211 INFO L409 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-01-21 10:09:28,212 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-01-21 10:09:28,212 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1432, Invalid=2350, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 10:09:28,213 INFO L87 Difference]: Start difference. First operand 176 states and 178 transitions. Second operand 42 states. [2018-01-21 10:09:28,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:09:28,391 INFO L93 Difference]: Finished difference Result 276 states and 281 transitions. [2018-01-21 10:09:28,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 10:09:28,391 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 173 [2018-01-21 10:09:28,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:09:28,392 INFO L225 Difference]: With dead ends: 276 [2018-01-21 10:09:28,392 INFO L226 Difference]: Without dead ends: 188 [2018-01-21 10:09:28,393 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 649 SyntacticMatches, 4 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1649 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1493, Invalid=2413, Unknown=0, NotChecked=0, Total=3906 [2018-01-21 10:09:28,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2018-01-21 10:09:28,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 184. [2018-01-21 10:09:28,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-01-21 10:09:28,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 186 transitions. [2018-01-21 10:09:28,403 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 186 transitions. Word has length 173 [2018-01-21 10:09:28,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:09:28,403 INFO L432 AbstractCegarLoop]: Abstraction has 184 states and 186 transitions. [2018-01-21 10:09:28,403 INFO L433 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-01-21 10:09:28,403 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 186 transitions. [2018-01-21 10:09:28,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-01-21 10:09:28,405 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:09:28,405 INFO L322 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:09:28,405 INFO L371 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:09:28,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1592286803, now seen corresponding path program 17 times [2018-01-21 10:09:28,405 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:09:28,406 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:28,406 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:09:28,406 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:09:28,406 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:09:28,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:09:28,426 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:09:28,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 722 refuted. 0 times theorem prover too weak. 722 trivial. 0 not checked. [2018-01-21 10:09:28,726 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:28,726 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:09:28,726 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:09:28,726 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:09:28,726 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:09:28,726 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:09:28,731 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:09:28,731 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:09:28,741 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:28,743 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:28,745 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:28,748 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:28,752 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:28,763 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:28,783 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:28,799 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:28,879 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:28,985 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:29,165 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:29,781 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Received shutdown request... [2018-01-21 10:09:31,214 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:09:33,135 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown