java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:29:35,419 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:29:35,421 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:29:35,437 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:29:35,437 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:29:35,438 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:29:35,439 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:29:35,441 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:29:35,443 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:29:35,444 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:29:35,445 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:29:35,445 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:29:35,446 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:29:35,448 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:29:35,448 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:29:35,451 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:29:35,453 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:29:35,455 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:29:35,457 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:29:35,458 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:29:35,460 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 10:29:35,461 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 10:29:35,461 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 10:29:35,462 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 10:29:35,463 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 10:29:35,464 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 10:29:35,464 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 10:29:35,465 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 10:29:35,465 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 10:29:35,465 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:29:35,466 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:29:35,466 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 10:29:35,475 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:29:35,475 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:29:35,476 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:29:35,476 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:29:35,476 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:29:35,476 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:29:35,476 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:29:35,477 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:29:35,477 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:29:35,477 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:29:35,477 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:29:35,477 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:29:35,477 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:29:35,478 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:29:35,478 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:29:35,478 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:29:35,478 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:29:35,478 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:29:35,478 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:29:35,478 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:29:35,479 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:29:35,479 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:29:35,479 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:29:35,479 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:29:35,479 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:29:35,480 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:29:35,480 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:29:35,480 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:29:35,480 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:29:35,480 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:29:35,480 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:29:35,480 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:29:35,480 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:29:35,481 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:29:35,481 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:29:35,481 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:29:35,481 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:29:35,482 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:29:35,482 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:29:35,513 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:29:35,524 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:29:35,527 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:29:35,528 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:29:35,528 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:29:35,529 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-21 10:29:35,631 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:29:35,636 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:29:35,637 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:29:35,637 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:29:35,643 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:29:35,644 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:29:35" (1/1) ... [2018-01-21 10:29:35,646 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23155f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35, skipping insertion in model container [2018-01-21 10:29:35,647 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:29:35" (1/1) ... [2018-01-21 10:29:35,661 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:29:35,675 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:29:35,788 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:29:35,803 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:29:35,810 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35 WrapperNode [2018-01-21 10:29:35,811 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:29:35,811 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:29:35,812 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:29:35,812 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:29:35,829 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35" (1/1) ... [2018-01-21 10:29:35,829 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35" (1/1) ... [2018-01-21 10:29:35,838 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35" (1/1) ... [2018-01-21 10:29:35,838 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35" (1/1) ... [2018-01-21 10:29:35,841 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35" (1/1) ... [2018-01-21 10:29:35,845 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35" (1/1) ... [2018-01-21 10:29:35,846 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35" (1/1) ... [2018-01-21 10:29:35,848 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:29:35,848 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:29:35,848 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:29:35,849 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:29:35,850 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35" (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 10:29:35,903 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:29:35,904 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:29:35,904 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 10:29:35,904 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:29:35,904 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:29:35,904 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:29:35,904 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:29:35,904 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:29:35,904 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:29:35,904 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 10:29:35,904 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:29:35,905 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:29:35,905 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:29:36,092 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:29:36,092 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:29:36 BoogieIcfgContainer [2018-01-21 10:29:36,093 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:29:36,093 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:29:36,094 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:29:36,096 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:29:36,096 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:29:35" (1/3) ... [2018-01-21 10:29:36,098 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@418b77a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:29:36, skipping insertion in model container [2018-01-21 10:29:36,098 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:29:35" (2/3) ... [2018-01-21 10:29:36,098 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@418b77a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:29:36, skipping insertion in model container [2018-01-21 10:29:36,098 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:29:36" (3/3) ... [2018-01-21 10:29:36,100 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-21 10:29:36,110 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:29:36,117 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 10:29:36,158 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:29:36,159 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:29:36,159 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:29:36,159 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:29:36,159 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:29:36,159 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:29:36,160 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:29:36,160 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:29:36,161 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:29:36,180 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:29:36,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:29:36,185 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:36,186 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:29:36,186 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:29:36,190 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 10:29:36,192 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:36,234 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,234 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:36,234 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,234 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:36,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:29:36,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:29:36,294 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:29:36,301 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:29:36,306 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:29:36,307 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:29:36,307 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:29:36,307 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:29:36,307 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:29:36,307 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:29:36,307 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:29:36,307 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 10:29:36,307 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:29:36,309 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:29:36,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 10:29:36,310 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:36,310 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:36,310 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 10:29:36,310 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 10:29:36,311 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:36,311 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,312 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:36,312 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,312 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:36,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:36,337 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:36,370 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 10:29:36,372 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:29:36,373 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:29:36,373 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:29:36,375 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:29:36,386 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:29:36,386 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:29:36,388 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:29:36,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:36,418 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:29:36,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:29:36,420 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 10:29:36,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:36,428 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:29:36,429 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 10:29:36,432 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 10:29:36,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 10:29:36,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 10:29:36,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 10:29:36,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 10:29:36,528 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 10:29:36,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:36,529 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 10:29:36,529 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:29:36,529 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 10:29:36,529 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 10:29:36,532 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:29:36,532 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:29:36,532 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:29:36,533 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:29:36,533 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:29:36,533 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:29:36,533 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:29:36,533 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:29:36,533 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:29:36,535 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:29:36,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 10:29:36,536 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:36,537 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:36,537 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:36,537 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 10:29:36,537 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:36,538 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,538 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:36,538 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,538 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:36,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:36,546 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:36,557 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 10:29:36,557 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:29:36,557 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:29:36,557 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:29:36,558 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:29:36,558 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:29:36,558 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:29:36,558 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:29:36,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:36,562 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:29:36,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:29:36,563 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 10:29:36,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:36,564 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:29:36,565 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 10:29:36,565 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 10:29:36,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 10:29:36,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 10:29:36,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 10:29:36,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 10:29:36,576 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 10:29:36,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:36,576 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 10:29:36,576 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:29:36,576 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 10:29:36,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 10:29:36,577 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:36,577 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:36,577 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:36,578 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 10:29:36,578 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:36,579 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,579 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:36,579 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,579 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:36,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:36,593 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:36,628 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 10:29:36,628 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:29:36,628 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:29:36,628 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:29:36,630 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:29:36,630 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:29:36,630 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:29:36,631 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 10:29:36,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:36,681 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 10:29:36,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:29:36,681 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 10:29:36,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:36,685 INFO L225 Difference]: With dead ends: 66 [2018-01-21 10:29:36,685 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 10:29:36,686 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 10:29:36,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 10:29:36,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 10:29:36,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 10:29:36,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 10:29:36,696 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 10:29:36,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:36,697 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 10:29:36,697 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:29:36,697 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 10:29:36,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 10:29:36,698 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:36,698 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:36,699 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:36,699 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 10:29:36,699 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:36,700 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,700 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:36,700 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:36,701 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:36,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:36,721 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:36,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:29:36,780 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:36,780 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:36,781 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 10:29:36,784 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 10:29:36,836 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:29:36,836 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:29:38,448 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:29:38,449 INFO L268 AbstractInterpreter]: Visited 30 different actions 92 times. Merged at 14 different actions 41 times. Never widened. Found 4 fixpoints after 2 different actions. Largest state had 17 variables. [2018-01-21 10:29:38,473 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:29:38,474 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:38,474 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 10:29:38,481 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:38,482 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:29:38,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:38,513 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:38,565 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:29:38,566 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:38,775 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:29:38,809 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 10:29:38,810 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 9 [2018-01-21 10:29:38,810 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:29:38,810 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:29:38,811 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:29:38,811 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-01-21 10:29:38,811 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 10:29:38,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:38,950 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 10:29:38,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 10:29:38,951 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 10:29:38,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:38,952 INFO L225 Difference]: With dead ends: 80 [2018-01-21 10:29:38,952 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 10:29:38,953 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-01-21 10:29:38,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 10:29:38,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 10:29:38,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 10:29:38,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 10:29:38,959 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 10:29:38,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:38,959 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 10:29:38,960 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:29:38,960 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 10:29:38,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 10:29:38,961 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:38,961 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:38,961 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:38,962 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 10:29:38,962 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:38,963 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:38,963 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:38,963 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:38,964 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:38,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:38,981 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:39,032 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 10:29:39,032 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:39,033 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:39,033 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 10:29:39,033 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 10:29:39,035 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:29:39,035 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:29:39,543 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:29:39,544 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-21 10:29:39,548 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:29:39,548 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:39,548 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:39,571 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:39,571 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:29:39,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:39,594 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:39,682 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:29:39,682 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:39,904 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:29:39,937 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:39,938 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 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 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:39,942 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:39,943 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:29:39,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:39,979 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:40,002 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 10:29:40,002 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:40,048 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 10:29:40,050 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:40,050 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6, 4, 4] total 13 [2018-01-21 10:29:40,050 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:40,051 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 10:29:40,051 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 10:29:40,051 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2018-01-21 10:29:40,051 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-21 10:29:40,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:40,310 INFO L93 Difference]: Finished difference Result 111 states and 126 transitions. [2018-01-21 10:29:40,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 10:29:40,311 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 10:29:40,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:40,312 INFO L225 Difference]: With dead ends: 111 [2018-01-21 10:29:40,313 INFO L226 Difference]: Without dead ends: 75 [2018-01-21 10:29:40,314 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2018-01-21 10:29:40,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-21 10:29:40,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 57. [2018-01-21 10:29:40,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 10:29:40,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-21 10:29:40,321 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 36 [2018-01-21 10:29:40,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:40,322 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-21 10:29:40,322 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 10:29:40,322 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-21 10:29:40,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-01-21 10:29:40,325 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:40,325 INFO L322 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:40,325 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:40,326 INFO L82 PathProgramCache]: Analyzing trace with hash 936865683, now seen corresponding path program 2 times [2018-01-21 10:29:40,326 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:40,327 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:40,327 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:40,327 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:40,327 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:40,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:40,353 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:40,437 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 10:29:40,437 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:40,437 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:40,437 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:40,437 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:40,438 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:40,438 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:40,451 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:29:40,451 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:29:40,467 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:40,477 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:40,478 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:40,481 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:40,600 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 10:29:40,600 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:40,736 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 10:29:40,757 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:40,757 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:40,760 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:29:40,760 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:29:40,774 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:40,791 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:40,803 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:40,808 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:40,824 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 10:29:40,825 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:40,865 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 10:29:40,867 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:40,867 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 8, 5, 5] total 18 [2018-01-21 10:29:40,867 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:40,867 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 10:29:40,867 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 10:29:40,868 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2018-01-21 10:29:40,868 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 11 states. [2018-01-21 10:29:41,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:41,064 INFO L93 Difference]: Finished difference Result 163 states and 183 transitions. [2018-01-21 10:29:41,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 10:29:41,064 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 62 [2018-01-21 10:29:41,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:41,067 INFO L225 Difference]: With dead ends: 163 [2018-01-21 10:29:41,067 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 10:29:41,067 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 231 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2018-01-21 10:29:41,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 10:29:41,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 87. [2018-01-21 10:29:41,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-01-21 10:29:41,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 95 transitions. [2018-01-21 10:29:41,080 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 95 transitions. Word has length 62 [2018-01-21 10:29:41,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:41,080 INFO L432 AbstractCegarLoop]: Abstraction has 87 states and 95 transitions. [2018-01-21 10:29:41,080 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 10:29:41,080 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 95 transitions. [2018-01-21 10:29:41,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-01-21 10:29:41,082 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:41,083 INFO L322 BasicCegarLoop]: trace histogram [11, 8, 8, 8, 8, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:41,083 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:41,083 INFO L82 PathProgramCache]: Analyzing trace with hash -780821890, now seen corresponding path program 3 times [2018-01-21 10:29:41,083 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:41,084 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:41,084 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:29:41,085 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:41,085 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:41,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:41,113 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:41,213 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 10:29:41,213 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:41,213 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:41,213 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:41,214 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:41,214 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:41,214 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:41,221 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:29:41,221 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:29:41,233 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:41,241 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:41,248 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:41,258 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:41,264 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:41,268 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:41,310 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 10:29:41,310 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:41,527 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 10:29:41,549 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:41,549 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:41,552 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:29:41,552 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:29:41,570 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:41,583 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:41,604 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:41,636 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:41,651 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:41,656 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:41,670 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 10:29:41,670 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:41,715 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 10:29:41,717 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:41,717 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-21 10:29:41,717 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:41,718 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 10:29:41,718 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 10:29:41,718 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 10:29:41,718 INFO L87 Difference]: Start difference. First operand 87 states and 95 transitions. Second operand 7 states. [2018-01-21 10:29:41,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:41,783 INFO L93 Difference]: Finished difference Result 146 states and 163 transitions. [2018-01-21 10:29:41,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 10:29:41,784 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 93 [2018-01-21 10:29:41,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:41,785 INFO L225 Difference]: With dead ends: 146 [2018-01-21 10:29:41,785 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 10:29:41,786 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 10:29:41,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 10:29:41,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 96. [2018-01-21 10:29:41,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 10:29:41,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2018-01-21 10:29:41,794 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 93 [2018-01-21 10:29:41,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:41,794 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2018-01-21 10:29:41,795 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 10:29:41,795 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2018-01-21 10:29:41,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-01-21 10:29:41,796 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:41,796 INFO L322 BasicCegarLoop]: trace histogram [15, 11, 11, 11, 11, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:41,796 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:41,796 INFO L82 PathProgramCache]: Analyzing trace with hash -389182277, now seen corresponding path program 4 times [2018-01-21 10:29:41,797 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:41,797 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:41,797 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:29:41,798 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:41,798 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:41,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:41,826 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:41,936 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 399 trivial. 0 not checked. [2018-01-21 10:29:41,936 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:41,936 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:41,937 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:41,937 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:41,937 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:41,937 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:41,942 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:29:41,942 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:29:41,966 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:41,969 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:42,045 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-21 10:29:42,045 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:42,213 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-21 10:29:42,234 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:42,235 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:42,239 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:29:42,239 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:29:42,284 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:42,289 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:42,314 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-21 10:29:42,315 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:42,483 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-21 10:29:42,485 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:42,485 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10, 10, 10] total 19 [2018-01-21 10:29:42,485 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:42,486 INFO L409 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-01-21 10:29:42,486 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-01-21 10:29:42,486 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2018-01-21 10:29:42,486 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand 15 states. [2018-01-21 10:29:42,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:42,720 INFO L93 Difference]: Finished difference Result 256 states and 287 transitions. [2018-01-21 10:29:42,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 10:29:42,720 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 119 [2018-01-21 10:29:42,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:42,722 INFO L225 Difference]: With dead ends: 256 [2018-01-21 10:29:42,722 INFO L226 Difference]: Without dead ends: 194 [2018-01-21 10:29:42,723 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 454 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=151, Invalid=551, Unknown=0, NotChecked=0, Total=702 [2018-01-21 10:29:42,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-01-21 10:29:42,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 131. [2018-01-21 10:29:42,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 10:29:42,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 10:29:42,736 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 119 [2018-01-21 10:29:42,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:42,736 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 10:29:42,736 INFO L433 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-01-21 10:29:42,736 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 10:29:42,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-01-21 10:29:42,738 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:42,738 INFO L322 BasicCegarLoop]: trace histogram [22, 17, 17, 17, 17, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:42,738 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:42,739 INFO L82 PathProgramCache]: Analyzing trace with hash 349526166, now seen corresponding path program 5 times [2018-01-21 10:29:42,739 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:42,739 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:42,739 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:29:42,739 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:42,739 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:42,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:42,771 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:42,907 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-21 10:29:42,907 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:42,907 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:42,907 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:42,907 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:42,907 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:42,908 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:42,916 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:29:42,916 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:29:42,937 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:42,940 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:42,943 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:42,946 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:42,981 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:42,989 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:42,998 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,005 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,007 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:43,011 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:43,215 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 580 proven. 204 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2018-01-21 10:29:43,215 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:43,576 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 245 proven. 355 refuted. 0 times theorem prover too weak. 370 trivial. 0 not checked. [2018-01-21 10:29:43,598 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:43,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:43,603 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:29:43,603 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:29:43,619 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,624 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,632 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,643 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,660 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,687 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,731 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,768 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:43,786 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:43,792 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:43,865 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 607 proven. 208 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-01-21 10:29:43,866 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:44,124 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 277 proven. 376 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2018-01-21 10:29:44,126 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:44,126 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 15, 15, 15, 15] total 33 [2018-01-21 10:29:44,126 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:44,127 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 10:29:44,127 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 10:29:44,127 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=902, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 10:29:44,127 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 21 states. [2018-01-21 10:29:44,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:44,645 INFO L93 Difference]: Finished difference Result 307 states and 344 transitions. [2018-01-21 10:29:44,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 10:29:44,646 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 160 [2018-01-21 10:29:44,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:44,648 INFO L225 Difference]: With dead ends: 307 [2018-01-21 10:29:44,648 INFO L226 Difference]: Without dead ends: 233 [2018-01-21 10:29:44,649 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 605 SyntacticMatches, 15 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=416, Invalid=2034, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 10:29:44,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2018-01-21 10:29:44,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 171. [2018-01-21 10:29:44,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-01-21 10:29:44,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 190 transitions. [2018-01-21 10:29:44,662 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 190 transitions. Word has length 160 [2018-01-21 10:29:44,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:44,662 INFO L432 AbstractCegarLoop]: Abstraction has 171 states and 190 transitions. [2018-01-21 10:29:44,662 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 10:29:44,662 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 190 transitions. [2018-01-21 10:29:44,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-01-21 10:29:44,664 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:44,665 INFO L322 BasicCegarLoop]: trace histogram [30, 24, 24, 24, 24, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:44,665 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:44,665 INFO L82 PathProgramCache]: Analyzing trace with hash 896426349, now seen corresponding path program 6 times [2018-01-21 10:29:44,665 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:44,666 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:44,666 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:29:44,666 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:44,667 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:44,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:44,701 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:44,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 10:29:44,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:44,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:44,878 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:44,878 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:44,878 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:44,878 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:44,883 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:29:44,883 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:29:44,897 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,899 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,902 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,904 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,907 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,909 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,912 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,915 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,920 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,923 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,927 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,933 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:44,934 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:44,938 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:44,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 10:29:44,964 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:45,054 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 10:29:45,075 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:45,075 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:45,078 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:29:45,079 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:29:45,096 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,104 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,115 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,126 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,142 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,162 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,188 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,226 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,279 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,412 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,588 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,833 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:45,857 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:45,864 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:45,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 10:29:45,885 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:45,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 10:29:45,973 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:45,973 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 10:29:45,973 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:45,974 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:29:45,974 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:29:45,974 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:29:45,974 INFO L87 Difference]: Start difference. First operand 171 states and 190 transitions. Second operand 10 states. [2018-01-21 10:29:46,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:46,046 INFO L93 Difference]: Finished difference Result 257 states and 288 transitions. [2018-01-21 10:29:46,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 10:29:46,046 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 206 [2018-01-21 10:29:46,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:46,048 INFO L225 Difference]: With dead ends: 257 [2018-01-21 10:29:46,048 INFO L226 Difference]: Without dead ends: 220 [2018-01-21 10:29:46,049 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 816 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:29:46,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-21 10:29:46,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 180. [2018-01-21 10:29:46,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 10:29:46,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 201 transitions. [2018-01-21 10:29:46,064 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 201 transitions. Word has length 206 [2018-01-21 10:29:46,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:46,064 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 201 transitions. [2018-01-21 10:29:46,064 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:29:46,065 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 201 transitions. [2018-01-21 10:29:46,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-01-21 10:29:46,068 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:46,069 INFO L322 BasicCegarLoop]: trace histogram [36, 29, 29, 29, 29, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:46,069 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:46,069 INFO L82 PathProgramCache]: Analyzing trace with hash 927615722, now seen corresponding path program 7 times [2018-01-21 10:29:46,069 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:46,070 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:46,070 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:29:46,070 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:46,070 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:46,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:46,105 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:46,322 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-01-21 10:29:46,322 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:46,322 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:46,322 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:46,323 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:46,323 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:46,323 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:46,329 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:46,329 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:29:46,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:46,390 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:46,551 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 10:29:46,551 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:46,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 10:29:46,851 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:46,851 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:46,854 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:46,855 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:29:46,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:46,957 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:47,021 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 10:29:47,021 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:47,304 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 10:29:47,306 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:47,307 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 14, 14, 14] total 28 [2018-01-21 10:29:47,307 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:47,307 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 10:29:47,308 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 10:29:47,308 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2018-01-21 10:29:47,308 INFO L87 Difference]: Start difference. First operand 180 states and 201 transitions. Second operand 22 states. [2018-01-21 10:29:47,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:47,781 INFO L93 Difference]: Finished difference Result 460 states and 516 transitions. [2018-01-21 10:29:47,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 10:29:47,781 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 242 [2018-01-21 10:29:47,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:47,783 INFO L225 Difference]: With dead ends: 460 [2018-01-21 10:29:47,783 INFO L226 Difference]: Without dead ends: 365 [2018-01-21 10:29:47,785 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 936 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 10:29:47,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2018-01-21 10:29:47,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 225. [2018-01-21 10:29:47,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-01-21 10:29:47,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2018-01-21 10:29:47,798 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 242 [2018-01-21 10:29:47,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:47,799 INFO L432 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2018-01-21 10:29:47,799 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 10:29:47,799 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2018-01-21 10:29:47,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2018-01-21 10:29:47,800 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:47,800 INFO L322 BasicCegarLoop]: trace histogram [46, 38, 38, 38, 38, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:47,800 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:47,801 INFO L82 PathProgramCache]: Analyzing trace with hash -965692109, now seen corresponding path program 8 times [2018-01-21 10:29:47,801 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:47,801 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:47,801 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:29:47,801 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:47,802 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:47,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:47,830 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:48,077 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 4291 trivial. 0 not checked. [2018-01-21 10:29:48,077 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:48,110 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:48,110 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:48,111 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:48,111 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:48,111 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:48,116 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:29:48,116 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:29:48,138 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:48,168 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:48,173 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:48,178 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:48,478 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-21 10:29:48,478 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:48,921 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-21 10:29:48,942 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:48,942 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:48,945 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:29:48,945 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:29:48,971 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:49,026 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:49,068 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:49,079 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:49,151 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-21 10:29:49,152 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:49,392 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-21 10:29:49,394 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:49,394 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 16, 16, 16] total 32 [2018-01-21 10:29:49,394 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:49,395 INFO L409 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-01-21 10:29:49,395 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-01-21 10:29:49,395 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2018-01-21 10:29:49,395 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand 25 states. [2018-01-21 10:29:49,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:49,922 INFO L93 Difference]: Finished difference Result 570 states and 639 transitions. [2018-01-21 10:29:49,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 10:29:49,922 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 298 [2018-01-21 10:29:49,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:49,925 INFO L225 Difference]: With dead ends: 570 [2018-01-21 10:29:49,925 INFO L226 Difference]: Without dead ends: 463 [2018-01-21 10:29:49,927 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1216 GetRequests, 1155 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=405, Invalid=1757, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 10:29:49,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-21 10:29:49,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 275. [2018-01-21 10:29:49,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2018-01-21 10:29:49,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 309 transitions. [2018-01-21 10:29:49,949 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 309 transitions. Word has length 298 [2018-01-21 10:29:49,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:49,949 INFO L432 AbstractCegarLoop]: Abstraction has 275 states and 309 transitions. [2018-01-21 10:29:49,950 INFO L433 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-01-21 10:29:49,950 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 309 transitions. [2018-01-21 10:29:49,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2018-01-21 10:29:49,952 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:49,953 INFO L322 BasicCegarLoop]: trace histogram [57, 48, 48, 48, 48, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:49,953 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:49,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1850454344, now seen corresponding path program 9 times [2018-01-21 10:29:49,953 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:49,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:49,954 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:29:49,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:49,954 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:49,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:49,992 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:50,358 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 6720 trivial. 0 not checked. [2018-01-21 10:29:50,359 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:50,359 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:50,359 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:50,359 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:50,359 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:50,359 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:50,364 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:29:50,365 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:29:50,397 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:50,402 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:50,407 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:50,413 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:50,421 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:50,429 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:50,437 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:50,442 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:50,448 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:50,449 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:50,455 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:50,691 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 10:29:50,691 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:51,095 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 10:29:51,128 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:51,128 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:51,133 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:29:51,134 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:29:51,173 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:51,185 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:51,207 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:51,241 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:51,290 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:51,382 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:51,558 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:51,802 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:52,178 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:29:52,214 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:52,221 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:52,278 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 10:29:52,278 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:52,490 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 10:29:52,492 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:52,493 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13, 13, 13] total 32 [2018-01-21 10:29:52,493 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:52,493 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 10:29:52,493 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 10:29:52,494 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=728, Unknown=0, NotChecked=0, Total=992 [2018-01-21 10:29:52,494 INFO L87 Difference]: Start difference. First operand 275 states and 309 transitions. Second operand 21 states. [2018-01-21 10:29:52,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:52,858 INFO L93 Difference]: Finished difference Result 650 states and 740 transitions. [2018-01-21 10:29:52,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-21 10:29:52,859 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 359 [2018-01-21 10:29:52,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:52,863 INFO L225 Difference]: With dead ends: 650 [2018-01-21 10:29:52,863 INFO L226 Difference]: Without dead ends: 601 [2018-01-21 10:29:52,864 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1454 GetRequests, 1414 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=424, Invalid=1136, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 10:29:52,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2018-01-21 10:29:52,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 338. [2018-01-21 10:29:52,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2018-01-21 10:29:52,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 385 transitions. [2018-01-21 10:29:52,889 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 385 transitions. Word has length 359 [2018-01-21 10:29:52,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:52,890 INFO L432 AbstractCegarLoop]: Abstraction has 338 states and 385 transitions. [2018-01-21 10:29:52,890 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 10:29:52,890 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 385 transitions. [2018-01-21 10:29:52,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-21 10:29:52,892 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:52,893 INFO L322 BasicCegarLoop]: trace histogram [69, 59, 59, 59, 59, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:52,893 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:52,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1164518591, now seen corresponding path program 10 times [2018-01-21 10:29:52,893 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:52,894 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:52,894 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:29:52,894 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:52,894 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:52,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:52,937 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:53,322 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 10005 trivial. 0 not checked. [2018-01-21 10:29:53,344 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:53,344 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:53,344 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:53,344 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:53,345 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:53,345 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:53,350 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:29:53,350 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:29:53,459 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:53,467 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:53,804 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-21 10:29:53,805 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:54,237 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-21 10:29:54,270 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:54,270 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:54,273 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:29:54,273 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:29:54,427 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:54,437 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:54,527 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-21 10:29:54,527 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:54,800 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-21 10:29:54,802 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:54,802 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20, 20, 20, 20] total 40 [2018-01-21 10:29:54,802 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:54,803 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 10:29:54,803 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 10:29:54,803 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=1273, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 10:29:54,803 INFO L87 Difference]: Start difference. First operand 338 states and 385 transitions. Second operand 31 states. [2018-01-21 10:29:55,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:29:55,675 INFO L93 Difference]: Finished difference Result 858 states and 980 transitions. [2018-01-21 10:29:55,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-21 10:29:55,675 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 425 [2018-01-21 10:29:55,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:29:55,679 INFO L225 Difference]: With dead ends: 858 [2018-01-21 10:29:55,679 INFO L226 Difference]: Without dead ends: 717 [2018-01-21 10:29:55,681 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1730 GetRequests, 1653 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=616, Invalid=2806, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 10:29:55,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2018-01-21 10:29:55,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 398. [2018-01-21 10:29:55,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2018-01-21 10:29:55,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 451 transitions. [2018-01-21 10:29:55,718 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 451 transitions. Word has length 425 [2018-01-21 10:29:55,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:29:55,719 INFO L432 AbstractCegarLoop]: Abstraction has 398 states and 451 transitions. [2018-01-21 10:29:55,719 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 10:29:55,719 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 451 transitions. [2018-01-21 10:29:55,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2018-01-21 10:29:55,721 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:29:55,721 INFO L322 BasicCegarLoop]: trace histogram [81, 70, 70, 70, 70, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:29:55,722 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:29:55,722 INFO L82 PathProgramCache]: Analyzing trace with hash -153318926, now seen corresponding path program 11 times [2018-01-21 10:29:55,722 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:29:55,722 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:55,723 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:29:55,723 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:29:55,723 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:29:55,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:29:55,756 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:29:56,198 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 13945 trivial. 0 not checked. [2018-01-21 10:29:56,199 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:56,199 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:29:56,199 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:29:56,199 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:29:56,199 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:56,199 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:29:56,206 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:29:56,206 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:29:56,235 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:56,244 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:56,249 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:56,255 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:56,263 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:56,271 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:56,278 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:56,286 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:56,294 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:56,295 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:56,303 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:56,653 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-21 10:29:56,653 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:57,616 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-21 10:29:57,649 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:29:57,649 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:29:57,652 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:29:57,652 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:29:57,691 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:57,702 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:57,723 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:57,758 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:57,838 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:57,982 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:58,096 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:58,241 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:58,398 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:29:58,429 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:29:58,438 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:29:58,605 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-21 10:29:58,605 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:29:58,949 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-21 10:29:58,951 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:29:58,951 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21, 21, 21, 21] total 44 [2018-01-21 10:29:58,951 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:29:58,952 INFO L409 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-01-21 10:29:58,952 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-01-21 10:29:58,953 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=1611, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 10:29:58,953 INFO L87 Difference]: Start difference. First operand 398 states and 451 transitions. Second operand 33 states. [2018-01-21 10:30:01,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:30:01,081 INFO L93 Difference]: Finished difference Result 969 states and 1094 transitions. [2018-01-21 10:30:01,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-21 10:30:01,081 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 491 [2018-01-21 10:30:01,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:30:01,083 INFO L225 Difference]: With dead ends: 969 [2018-01-21 10:30:01,083 INFO L226 Difference]: Without dead ends: 555 [2018-01-21 10:30:01,086 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2019 GetRequests, 1925 SyntacticMatches, 20 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1648 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=919, Invalid=4781, Unknown=0, NotChecked=0, Total=5700 [2018-01-21 10:30:01,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2018-01-21 10:30:01,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 399. [2018-01-21 10:30:01,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2018-01-21 10:30:01,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 444 transitions. [2018-01-21 10:30:01,104 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 444 transitions. Word has length 491 [2018-01-21 10:30:01,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:30:01,105 INFO L432 AbstractCegarLoop]: Abstraction has 399 states and 444 transitions. [2018-01-21 10:30:01,105 INFO L433 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-01-21 10:30:01,105 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 444 transitions. [2018-01-21 10:30:01,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 553 [2018-01-21 10:30:01,108 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:30:01,108 INFO L322 BasicCegarLoop]: trace histogram [92, 80, 80, 80, 80, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:30:01,108 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:30:01,109 INFO L82 PathProgramCache]: Analyzing trace with hash 1811475687, now seen corresponding path program 12 times [2018-01-21 10:30:01,109 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:30:01,109 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:30:01,109 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:30:01,109 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:30:01,109 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:30:01,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:30:01,146 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:30:01,686 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 18116 trivial. 0 not checked. [2018-01-21 10:30:01,686 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:30:01,686 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:30:01,686 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:30:01,686 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:30:01,686 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:30:01,686 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:30:01,693 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:30:01,693 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:30:01,726 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,731 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,741 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,746 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,751 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,756 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,762 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,771 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,780 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,789 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,797 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,806 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,817 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,830 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,842 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,856 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,870 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,888 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,912 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,925 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,938 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:01,940 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:30:01,949 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:30:02,378 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-21 10:30:02,378 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:30:03,398 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-21 10:30:03,432 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:30:03,432 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:30:03,439 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:30:03,440 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:30:03,486 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:03,503 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:03,529 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:03,561 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:03,625 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:03,736 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:04,440 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:30:14,311 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... [2018-01-21 10:30:26,366 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown