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_precise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:00:36,925 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:00:36,927 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:00:36,942 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:00:36,942 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:00:36,943 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:00:36,944 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:00:36,946 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:00:36,948 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:00:36,949 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:00:36,950 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:00:36,950 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:00:36,951 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:00:36,952 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:00:36,953 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:00:36,955 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:00:36,958 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:00:36,960 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:00:36,961 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:00:36,963 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:00:36,965 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:00:36,965 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:00:36,966 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:00:36,967 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:00:36,968 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:00:36,969 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:00:36,969 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:00:36,970 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:00:36,970 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:00:36,970 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:00:36,971 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:00:36,971 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_precise.epf [2018-01-21 06:00:36,981 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:00:36,981 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:00:36,981 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:00:36,982 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:00:36,982 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:00:36,982 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:00:36,982 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:00:36,982 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:00:36,982 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:00:36,983 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:00:36,983 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:00:36,983 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:00:36,983 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:00:36,983 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:00:36,983 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:00:36,984 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:00:36,984 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:00:36,984 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:00:36,984 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:00:36,984 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:00:36,984 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:00:36,984 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:00:36,985 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:00:36,985 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:00:36,985 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:00:36,985 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:00:36,985 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:00:36,986 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:00:36,986 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:00:36,986 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:00:36,986 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:00:36,986 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:00:36,986 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:00:36,986 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:00:36,987 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:00:36,987 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:00:36,987 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:00:36,987 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:00:36,988 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:00:37,021 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:00:37,032 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:00:37,035 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:00:37,036 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:00:37,036 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:00:37,037 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c [2018-01-21 06:00:37,162 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:00:37,167 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:00:37,168 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:00:37,168 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:00:37,173 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:00:37,174 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:00:37" (1/1) ... [2018-01-21 06:00:37,177 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60aa16d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37, skipping insertion in model container [2018-01-21 06:00:37,178 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:00:37" (1/1) ... [2018-01-21 06:00:37,192 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:00:37,207 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:00:37,325 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:00:37,343 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:00:37,349 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37 WrapperNode [2018-01-21 06:00:37,350 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:00:37,350 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:00:37,351 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:00:37,351 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:00:37,369 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37" (1/1) ... [2018-01-21 06:00:37,369 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37" (1/1) ... [2018-01-21 06:00:37,377 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37" (1/1) ... [2018-01-21 06:00:37,377 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37" (1/1) ... [2018-01-21 06:00:37,379 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37" (1/1) ... [2018-01-21 06:00:37,382 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37" (1/1) ... [2018-01-21 06:00:37,383 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37" (1/1) ... [2018-01-21 06:00:37,384 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:00:37,385 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:00:37,385 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:00:37,385 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:00:37,386 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37" (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 06:00:37,448 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:00:37,448 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:00:37,448 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 06:00:37,448 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:00:37,449 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:00:37,449 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:00:37,449 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:00:37,449 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:00:37,449 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:00:37,449 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 06:00:37,450 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:00:37,450 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:00:37,450 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:00:37,611 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:00:37,611 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:00:37 BoogieIcfgContainer [2018-01-21 06:00:37,612 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:00:37,612 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:00:37,613 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:00:37,615 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:00:37,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:00:37" (1/3) ... [2018-01-21 06:00:37,616 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42b65508 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:00:37, skipping insertion in model container [2018-01-21 06:00:37,616 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:37" (2/3) ... [2018-01-21 06:00:37,617 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42b65508 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:00:37, skipping insertion in model container [2018-01-21 06:00:37,617 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:00:37" (3/3) ... [2018-01-21 06:00:37,618 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_false-valid-deref-read.c [2018-01-21 06:00:37,627 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:00:37,634 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 06:00:37,681 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:00:37,681 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:00:37,681 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:00:37,681 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:00:37,682 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:00:37,682 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:00:37,682 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:00:37,682 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:00:37,683 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:00:37,701 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:00:37,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:00:37,706 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:37,707 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:00:37,708 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:00:37,711 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 06:00:37,713 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:37,752 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:37,752 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:37,752 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:37,753 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:37,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:00:37,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:00:37,806 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:00:37,812 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:00:37,818 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:00:37,818 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:00:37,818 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:00:37,818 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:00:37,818 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:00:37,819 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:00:37,819 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:00:37,819 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 06:00:37,819 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:00:37,821 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:00:37,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 06:00:37,822 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:37,823 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:00:37,823 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 06:00:37,823 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 06:00:37,823 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:37,825 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:37,825 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:37,825 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:37,825 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:37,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:37,851 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:37,884 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 06:00:37,886 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:00:37,886 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:00:37,886 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:00:37,888 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:00:37,903 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:00:37,903 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:00:37,905 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:00:37,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:37,928 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:00:37,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:00:37,929 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 06:00:37,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:37,935 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:00:37,935 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 06:00:37,938 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 06:00:38,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 06:00:38,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 06:00:38,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 06:00:38,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 06:00:38,024 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 06:00:38,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:38,025 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 06:00:38,025 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:00:38,025 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 06:00:38,025 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 06:00:38,028 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:00:38,028 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:00:38,028 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:00:38,028 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:00:38,029 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:00:38,029 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:00:38,029 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:00:38,029 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:00:38,029 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:00:38,031 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:00:38,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 06:00:38,032 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:38,032 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 06:00:38,032 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:38,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 06:00:38,033 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:38,034 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:38,034 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:38,034 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:38,034 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:38,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:38,043 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:38,056 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 06:00:38,057 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:00:38,057 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:00:38,057 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:00:38,057 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:00:38,058 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:00:38,058 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:00:38,058 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:00:38,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:38,064 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:00:38,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:00:38,065 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 06:00:38,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:38,067 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:00:38,067 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 06:00:38,067 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 06:00:38,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 06:00:38,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 06:00:38,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 06:00:38,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 06:00:38,079 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 06:00:38,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:38,079 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 06:00:38,079 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:00:38,079 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 06:00:38,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:00:38,080 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:38,080 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 06:00:38,080 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:38,081 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 06:00:38,081 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:38,082 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:38,082 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:38,082 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:38,083 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:38,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:38,091 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:38,128 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 06:00:38,128 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:00:38,128 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 06:00:38,129 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:00:38,130 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 06:00:38,130 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 06:00:38,130 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:00:38,130 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 06:00:38,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:38,176 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 06:00:38,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 06:00:38,177 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 06:00:38,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:38,179 INFO L225 Difference]: With dead ends: 66 [2018-01-21 06:00:38,180 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 06:00:38,180 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 06:00:38,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 06:00:38,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 06:00:38,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 06:00:38,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 06:00:38,190 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 06:00:38,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:38,191 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 06:00:38,191 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 06:00:38,191 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 06:00:38,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 06:00:38,192 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:38,192 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 06:00:38,192 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:38,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 06:00:38,193 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:38,194 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:38,194 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:38,194 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:38,194 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:38,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:38,212 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:38,371 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 06:00:38,371 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:00:38,371 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 06:00:38,371 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:00:38,371 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 06:00:38,372 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 06:00:38,372 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-01-21 06:00:38,372 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 6 states. [2018-01-21 06:00:38,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:38,490 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2018-01-21 06:00:38,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:00:38,490 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2018-01-21 06:00:38,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:38,491 INFO L225 Difference]: With dead ends: 90 [2018-01-21 06:00:38,491 INFO L226 Difference]: Without dead ends: 59 [2018-01-21 06:00:38,492 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:00:38,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-01-21 06:00:38,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2018-01-21 06:00:38,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 06:00:38,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2018-01-21 06:00:38,499 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 31 [2018-01-21 06:00:38,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:38,499 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2018-01-21 06:00:38,499 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 06:00:38,499 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2018-01-21 06:00:38,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 06:00:38,502 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:38,502 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 06:00:38,502 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:38,503 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 06:00:38,503 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:38,504 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:38,504 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:38,504 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:38,504 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:38,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:38,520 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:38,660 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 06:00:38,661 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:38,661 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:38,662 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 06:00:38,664 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 06:00:38,724 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:00:38,724 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:00:41,759 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:00:41,760 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 06:00:41,768 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:00:41,769 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:41,769 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 06:00:41,778 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:41,778 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:00:41,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:41,806 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:41,905 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 06:00:41,905 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:42,308 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 06:00:42,329 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:42,330 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:42,346 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:42,346 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:00:42,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:42,375 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:42,488 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 06:00:42,488 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:42,546 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [MP cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (3)] Exception during sending of exit command (exit): Broken pipe [2018-01-21 06:00:42,549 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:42,549 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 4, 4] total 16 [2018-01-21 06:00:42,550 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:42,550 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:00:42,550 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:00:42,551 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2018-01-21 06:00:42,551 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand 10 states. [2018-01-21 06:00:42,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:42,841 INFO L93 Difference]: Finished difference Result 103 states and 115 transitions. [2018-01-21 06:00:42,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 06:00:42,842 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 36 [2018-01-21 06:00:42,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:42,843 INFO L225 Difference]: With dead ends: 103 [2018-01-21 06:00:42,843 INFO L226 Difference]: Without dead ends: 61 [2018-01-21 06:00:42,844 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 131 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2018-01-21 06:00:42,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-01-21 06:00:42,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 48. [2018-01-21 06:00:42,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 06:00:42,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-01-21 06:00:42,851 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 36 [2018-01-21 06:00:42,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:42,851 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-01-21 06:00:42,851 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:00:42,851 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-01-21 06:00:42,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 06:00:42,852 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:42,852 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:00:42,853 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:42,853 INFO L82 PathProgramCache]: Analyzing trace with hash -524554428, now seen corresponding path program 2 times [2018-01-21 06:00:42,853 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:42,854 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:42,854 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:42,854 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:42,854 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:42,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:42,870 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:42,908 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 06:00:42,909 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:42,909 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:42,909 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:42,909 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:42,909 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:42,909 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:42,918 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:00:42,918 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:42,931 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:42,938 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:42,939 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:42,942 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:42,965 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 06:00:42,966 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:42,999 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 06:00:43,019 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:43,019 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:43,022 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:00:43,022 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:43,033 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:43,045 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:43,052 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:43,056 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:43,061 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 06:00:43,061 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:43,139 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 06:00:43,140 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:43,141 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 06:00:43,141 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:43,141 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:00:43,141 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:00:43,142 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:00:43,142 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 5 states. [2018-01-21 06:00:43,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:43,192 INFO L93 Difference]: Finished difference Result 89 states and 99 transitions. [2018-01-21 06:00:43,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 06:00:43,192 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 41 [2018-01-21 06:00:43,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:43,194 INFO L225 Difference]: With dead ends: 89 [2018-01-21 06:00:43,194 INFO L226 Difference]: Without dead ends: 72 [2018-01-21 06:00:43,194 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:00:43,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-01-21 06:00:43,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 57. [2018-01-21 06:00:43,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 06:00:43,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-21 06:00:43,202 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 41 [2018-01-21 06:00:43,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:43,202 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-21 06:00:43,202 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:00:43,203 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-21 06:00:43,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-01-21 06:00:43,204 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:43,204 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 06:00:43,205 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:43,205 INFO L82 PathProgramCache]: Analyzing trace with hash 936865683, now seen corresponding path program 3 times [2018-01-21 06:00:43,205 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:43,206 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:43,206 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:43,206 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:43,206 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:43,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:43,227 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:43,285 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 06:00:43,286 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:43,286 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:43,286 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:43,286 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:43,286 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:43,286 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:43,295 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:00:43,295 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:00:43,308 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:43,319 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:43,324 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:43,325 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:43,328 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:43,358 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 06:00:43,358 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:43,403 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 06:00:43,433 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:43,434 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:43,437 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:00:43,437 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:00:43,450 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:43,461 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:43,475 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:43,483 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:43,487 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:43,495 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 06:00:43,495 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:43,538 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 06:00:43,539 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:43,540 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 06:00:43,540 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:43,540 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 06:00:43,541 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 06:00:43,541 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:00:43,541 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 6 states. [2018-01-21 06:00:43,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:43,591 INFO L93 Difference]: Finished difference Result 107 states and 120 transitions. [2018-01-21 06:00:43,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:00:43,591 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 62 [2018-01-21 06:00:43,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:43,593 INFO L225 Difference]: With dead ends: 107 [2018-01-21 06:00:43,593 INFO L226 Difference]: Without dead ends: 86 [2018-01-21 06:00:43,594 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:00:43,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2018-01-21 06:00:43,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 66. [2018-01-21 06:00:43,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-01-21 06:00:43,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 73 transitions. [2018-01-21 06:00:43,602 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 73 transitions. Word has length 62 [2018-01-21 06:00:43,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:43,603 INFO L432 AbstractCegarLoop]: Abstraction has 66 states and 73 transitions. [2018-01-21 06:00:43,603 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 06:00:43,603 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 73 transitions. [2018-01-21 06:00:43,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-01-21 06:00:43,605 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:43,605 INFO L322 BasicCegarLoop]: trace histogram [9, 6, 6, 6, 6, 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 06:00:43,605 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:43,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1345357476, now seen corresponding path program 4 times [2018-01-21 06:00:43,605 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:43,606 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:43,606 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:43,607 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:43,607 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:43,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:43,629 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:43,718 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 06:00:43,718 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:43,718 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:43,718 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:43,718 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:43,718 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:43,718 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:43,725 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:00:43,726 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:00:43,757 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:43,760 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:43,822 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 118 proven. 9 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2018-01-21 06:00:43,822 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:43,935 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 50 proven. 42 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2018-01-21 06:00:43,958 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:43,958 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:43,961 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:00:43,961 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:00:43,996 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:44,000 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:44,015 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 118 proven. 9 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2018-01-21 06:00:44,015 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:44,145 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 50 proven. 42 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2018-01-21 06:00:44,147 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:44,147 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 8, 8] total 15 [2018-01-21 06:00:44,147 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:44,148 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 06:00:44,148 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 06:00:44,148 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2018-01-21 06:00:44,148 INFO L87 Difference]: Start difference. First operand 66 states and 73 transitions. Second operand 12 states. [2018-01-21 06:00:44,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:44,372 INFO L93 Difference]: Finished difference Result 185 states and 209 transitions. [2018-01-21 06:00:44,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 06:00:44,372 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 83 [2018-01-21 06:00:44,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:44,374 INFO L225 Difference]: With dead ends: 185 [2018-01-21 06:00:44,374 INFO L226 Difference]: Without dead ends: 135 [2018-01-21 06:00:44,375 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 315 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=98, Invalid=322, Unknown=0, NotChecked=0, Total=420 [2018-01-21 06:00:44,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-01-21 06:00:44,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 96. [2018-01-21 06:00:44,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 06:00:44,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2018-01-21 06:00:44,388 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 83 [2018-01-21 06:00:44,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:44,389 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2018-01-21 06:00:44,389 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 06:00:44,389 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2018-01-21 06:00:44,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-01-21 06:00:44,391 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:44,392 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 06:00:44,392 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:44,392 INFO L82 PathProgramCache]: Analyzing trace with hash -389182277, now seen corresponding path program 5 times [2018-01-21 06:00:44,392 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:44,393 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:44,393 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:44,393 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:44,393 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:44,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:44,420 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:44,526 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 06:00:44,526 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:44,526 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:44,527 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:44,527 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:44,527 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:44,527 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:44,534 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:00:44,535 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:44,546 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:44,549 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:44,553 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:44,557 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:44,562 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:44,562 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:44,566 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:44,681 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 270 proven. 118 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2018-01-21 06:00:44,681 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:44,939 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 105 proven. 218 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2018-01-21 06:00:44,960 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:44,960 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:44,963 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:00:44,963 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:44,974 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:44,978 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:44,990 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:45,007 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:45,027 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:45,039 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:45,043 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:45,082 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 302 proven. 95 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-01-21 06:00:45,115 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:45,363 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 142 proven. 207 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2018-01-21 06:00:45,365 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:45,366 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 13, 13, 13, 13] total 29 [2018-01-21 06:00:45,366 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:45,366 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 06:00:45,366 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 06:00:45,367 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2018-01-21 06:00:45,367 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand 18 states. [2018-01-21 06:00:45,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:45,762 INFO L93 Difference]: Finished difference Result 234 states and 263 transitions. [2018-01-21 06:00:45,762 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-01-21 06:00:45,763 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 119 [2018-01-21 06:00:45,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:45,764 INFO L225 Difference]: With dead ends: 234 [2018-01-21 06:00:45,764 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 06:00:45,766 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 445 SyntacticMatches, 13 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 519 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=316, Invalid=1490, Unknown=0, NotChecked=0, Total=1806 [2018-01-21 06:00:45,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 06:00:45,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 131. [2018-01-21 06:00:45,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 06:00:45,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 06:00:45,782 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 119 [2018-01-21 06:00:45,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:45,782 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 06:00:45,782 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 06:00:45,782 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 06:00:45,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-01-21 06:00:45,785 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:45,785 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 06:00:45,786 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:45,786 INFO L82 PathProgramCache]: Analyzing trace with hash 349526166, now seen corresponding path program 6 times [2018-01-21 06:00:45,786 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:45,787 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:45,787 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:45,787 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:45,787 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:45,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:45,816 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:45,993 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 06:00:45,994 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:45,994 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:45,994 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:45,994 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:45,994 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:45,994 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:46,000 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:00:46,001 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:00:46,014 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,033 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,048 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,051 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,054 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,058 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,063 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,067 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,074 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,076 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:46,079 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:46,098 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 06:00:46,098 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:46,242 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 06:00:46,263 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:46,263 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:46,266 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:00:46,266 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:00:46,282 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,290 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,307 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,326 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,356 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,387 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,424 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,516 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,687 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:46,708 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:46,714 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:46,729 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 06:00:46,729 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:46,765 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 06:00:46,766 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:46,767 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 15 [2018-01-21 06:00:46,767 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:46,767 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 06:00:46,767 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 06:00:46,767 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-01-21 06:00:46,767 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 9 states. [2018-01-21 06:00:46,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:46,837 INFO L93 Difference]: Finished difference Result 208 states and 233 transitions. [2018-01-21 06:00:46,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 06:00:46,838 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 160 [2018-01-21 06:00:46,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:46,839 INFO L225 Difference]: With dead ends: 208 [2018-01-21 06:00:46,839 INFO L226 Difference]: Without dead ends: 175 [2018-01-21 06:00:46,840 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 633 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-01-21 06:00:46,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-01-21 06:00:46,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 140. [2018-01-21 06:00:46,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-01-21 06:00:46,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 156 transitions. [2018-01-21 06:00:46,854 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 156 transitions. Word has length 160 [2018-01-21 06:00:46,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:46,854 INFO L432 AbstractCegarLoop]: Abstraction has 140 states and 156 transitions. [2018-01-21 06:00:46,854 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 06:00:46,854 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 156 transitions. [2018-01-21 06:00:46,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-01-21 06:00:46,856 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:46,856 INFO L322 BasicCegarLoop]: trace histogram [27, 21, 21, 21, 21, 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 06:00:46,856 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:46,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1727385407, now seen corresponding path program 7 times [2018-01-21 06:00:46,857 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:46,857 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:46,857 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:46,857 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:46,858 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:46,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:46,884 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:46,989 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1392 trivial. 0 not checked. [2018-01-21 06:00:46,989 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:46,989 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:46,989 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:46,989 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:46,990 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:46,990 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:46,999 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:46,999 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:00:47,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:47,041 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:47,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 995 proven. 38 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2018-01-21 06:00:47,143 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:47,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 311 proven. 240 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2018-01-21 06:00:47,347 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:47,347 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:47,350 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:47,350 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:00:47,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:47,428 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:47,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 995 proven. 38 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2018-01-21 06:00:47,450 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:47,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 311 proven. 240 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2018-01-21 06:00:47,593 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:47,593 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 12, 12, 12] total 24 [2018-01-21 06:00:47,593 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:47,594 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 06:00:47,594 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 06:00:47,594 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2018-01-21 06:00:47,595 INFO L87 Difference]: Start difference. First operand 140 states and 156 transitions. Second operand 19 states. [2018-01-21 06:00:47,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:47,885 INFO L93 Difference]: Finished difference Result 363 states and 408 transitions. [2018-01-21 06:00:47,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 06:00:47,885 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 191 [2018-01-21 06:00:47,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:47,888 INFO L225 Difference]: With dead ends: 363 [2018-01-21 06:00:47,888 INFO L226 Difference]: Without dead ends: 280 [2018-01-21 06:00:47,889 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 737 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=238, Invalid=952, Unknown=0, NotChecked=0, Total=1190 [2018-01-21 06:00:47,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2018-01-21 06:00:47,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 180. [2018-01-21 06:00:47,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 06:00:47,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 201 transitions. [2018-01-21 06:00:47,904 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 201 transitions. Word has length 191 [2018-01-21 06:00:47,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:47,905 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 201 transitions. [2018-01-21 06:00:47,905 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 06:00:47,905 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 201 transitions. [2018-01-21 06:00:47,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-01-21 06:00:47,906 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:47,907 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 06:00:47,907 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:47,907 INFO L82 PathProgramCache]: Analyzing trace with hash 927615722, now seen corresponding path program 8 times [2018-01-21 06:00:47,907 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:47,908 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:47,908 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:47,908 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:47,908 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:47,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:47,935 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:48,151 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 06:00:48,151 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:48,151 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:48,151 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:48,151 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:48,152 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:48,152 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:48,157 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:00:48,157 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:48,173 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:48,199 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:48,204 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:48,210 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:48,350 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 06:00:48,350 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:48,629 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 06:00:48,649 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:48,649 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:48,652 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:00:48,652 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:48,670 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:48,711 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:48,744 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:48,751 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:48,789 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 06:00:48,789 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:48,981 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 06:00:48,983 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:48,983 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 14, 14, 14] total 28 [2018-01-21 06:00:48,983 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:48,983 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 06:00:48,984 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 06:00:48,984 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2018-01-21 06:00:48,984 INFO L87 Difference]: Start difference. First operand 180 states and 201 transitions. Second operand 22 states. [2018-01-21 06:00:49,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:49,362 INFO L93 Difference]: Finished difference Result 460 states and 516 transitions. [2018-01-21 06:00:49,363 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 06:00:49,363 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 242 [2018-01-21 06:00:49,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:49,365 INFO L225 Difference]: With dead ends: 460 [2018-01-21 06:00:49,365 INFO L226 Difference]: Without dead ends: 365 [2018-01-21 06:00:49,366 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 936 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 06:00:49,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2018-01-21 06:00:49,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 225. [2018-01-21 06:00:49,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-01-21 06:00:49,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2018-01-21 06:00:49,382 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 242 [2018-01-21 06:00:49,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:49,383 INFO L432 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2018-01-21 06:00:49,383 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 06:00:49,383 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2018-01-21 06:00:49,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2018-01-21 06:00:49,388 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:49,388 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 06:00:49,388 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:49,389 INFO L82 PathProgramCache]: Analyzing trace with hash -965692109, now seen corresponding path program 9 times [2018-01-21 06:00:49,389 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:49,390 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:49,390 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:49,390 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:49,390 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:49,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:49,428 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:49,710 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 06:00:49,711 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:49,711 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:49,711 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:49,711 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:49,711 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:49,711 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:49,716 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:00:49,716 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:00:49,741 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:49,744 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:49,747 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:49,751 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:49,757 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:49,762 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:49,767 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:49,772 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:49,774 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:49,781 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:49,947 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1173 proven. 87 refuted. 0 times theorem prover too weak. 3187 trivial. 0 not checked. [2018-01-21 06:00:49,947 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:50,291 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1173 proven. 87 refuted. 0 times theorem prover too weak. 3187 trivial. 0 not checked. [2018-01-21 06:00:50,320 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:50,321 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:50,329 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:00:50,329 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:00:50,365 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:50,373 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:50,387 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:50,417 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:50,454 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:50,526 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:50,644 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:50,853 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:50,876 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:50,884 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:50,936 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1173 proven. 87 refuted. 0 times theorem prover too weak. 3187 trivial. 0 not checked. [2018-01-21 06:00:50,936 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:51,122 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1173 proven. 87 refuted. 0 times theorem prover too weak. 3187 trivial. 0 not checked. [2018-01-21 06:00:51,124 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:51,125 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12, 12, 12] total 29 [2018-01-21 06:00:51,125 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:51,125 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 06:00:51,125 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 06:00:51,126 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=596, Unknown=0, NotChecked=0, Total=812 [2018-01-21 06:00:51,126 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand 19 states. [2018-01-21 06:00:51,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:51,414 INFO L93 Difference]: Finished difference Result 535 states and 610 transitions. [2018-01-21 06:00:51,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 06:00:51,414 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 298 [2018-01-21 06:00:51,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:51,418 INFO L225 Difference]: With dead ends: 535 [2018-01-21 06:00:51,418 INFO L226 Difference]: Without dead ends: 490 [2018-01-21 06:00:51,419 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1208 GetRequests, 1172 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=342, Invalid=918, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 06:00:51,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2018-01-21 06:00:51,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 283. [2018-01-21 06:00:51,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2018-01-21 06:00:51,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 322 transitions. [2018-01-21 06:00:51,444 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 322 transitions. Word has length 298 [2018-01-21 06:00:51,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:51,444 INFO L432 AbstractCegarLoop]: Abstraction has 283 states and 322 transitions. [2018-01-21 06:00:51,445 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 06:00:51,445 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 322 transitions. [2018-01-21 06:00:51,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2018-01-21 06:00:51,450 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:51,451 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 06:00:51,451 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:51,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1850454344, now seen corresponding path program 10 times [2018-01-21 06:00:51,451 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:51,452 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:51,452 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:51,452 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:51,452 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:51,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:51,496 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:51,876 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 06:00:51,876 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:51,876 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:51,877 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:51,877 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:51,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:51,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:51,882 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:00:51,882 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:00:51,950 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:51,957 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:52,216 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 4094 proven. 119 refuted. 0 times theorem prover too weak. 2705 trivial. 0 not checked. [2018-01-21 06:00:52,216 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:52,673 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1298 proven. 675 refuted. 0 times theorem prover too weak. 4945 trivial. 0 not checked. [2018-01-21 06:00:52,706 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:52,706 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:52,711 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:00:52,712 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:00:52,823 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:52,831 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:52,887 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 4094 proven. 119 refuted. 0 times theorem prover too weak. 2705 trivial. 0 not checked. [2018-01-21 06:00:52,887 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:53,108 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1298 proven. 675 refuted. 0 times theorem prover too weak. 4945 trivial. 0 not checked. [2018-01-21 06:00:53,110 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:53,110 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 18, 18, 18, 18] total 36 [2018-01-21 06:00:53,110 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:53,111 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 06:00:53,111 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 06:00:53,111 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1024, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 06:00:53,112 INFO L87 Difference]: Start difference. First operand 283 states and 322 transitions. Second operand 28 states. [2018-01-21 06:00:53,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:53,745 INFO L93 Difference]: Finished difference Result 722 states and 827 transitions. [2018-01-21 06:00:53,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-01-21 06:00:53,746 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 359 [2018-01-21 06:00:53,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:53,750 INFO L225 Difference]: With dead ends: 722 [2018-01-21 06:00:53,750 INFO L226 Difference]: Without dead ends: 593 [2018-01-21 06:00:53,751 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1463 GetRequests, 1394 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 893 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=505, Invalid=2251, Unknown=0, NotChecked=0, Total=2756 [2018-01-21 06:00:53,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2018-01-21 06:00:53,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 338. [2018-01-21 06:00:53,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2018-01-21 06:00:53,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 382 transitions. [2018-01-21 06:00:53,778 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 382 transitions. Word has length 359 [2018-01-21 06:00:53,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:53,778 INFO L432 AbstractCegarLoop]: Abstraction has 338 states and 382 transitions. [2018-01-21 06:00:53,779 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 06:00:53,779 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 382 transitions. [2018-01-21 06:00:53,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 421 [2018-01-21 06:00:53,782 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:53,782 INFO L322 BasicCegarLoop]: trace histogram [68, 58, 58, 58, 58, 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 06:00:53,782 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:53,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1447339731, now seen corresponding path program 11 times [2018-01-21 06:00:53,783 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:53,783 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:53,784 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:53,784 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:53,784 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:53,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:53,827 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:54,201 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 9695 trivial. 0 not checked. [2018-01-21 06:00:54,202 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:54,202 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:54,202 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:54,202 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:54,202 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:54,202 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:54,215 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:00:54,215 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:54,246 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:54,251 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:54,256 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:54,265 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:54,272 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:54,281 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:54,289 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:54,297 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:54,305 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:54,307 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:54,314 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:54,569 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5758 proven. 500 refuted. 0 times theorem prover too weak. 3682 trivial. 0 not checked. [2018-01-21 06:00:54,569 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:55,030 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 874 proven. 2168 refuted. 0 times theorem prover too weak. 6898 trivial. 0 not checked. [2018-01-21 06:00:55,050 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:55,050 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:55,053 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:00:55,053 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:55,081 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:55,089 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:55,106 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:55,132 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:55,176 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:55,231 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:55,298 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:55,381 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:55,455 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:55,479 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:55,487 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:55,578 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5758 proven. 500 refuted. 0 times theorem prover too weak. 3682 trivial. 0 not checked. [2018-01-21 06:00:55,578 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:55,853 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 874 proven. 2168 refuted. 0 times theorem prover too weak. 6898 trivial. 0 not checked. [2018-01-21 06:00:55,855 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:55,855 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 40 [2018-01-21 06:00:55,855 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:55,856 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 06:00:55,856 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 06:00:55,857 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1326, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 06:00:55,857 INFO L87 Difference]: Start difference. First operand 338 states and 382 transitions. Second operand 30 states. [2018-01-21 06:00:57,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:57,820 INFO L93 Difference]: Finished difference Result 804 states and 906 transitions. [2018-01-21 06:00:57,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 06:00:57,820 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 420 [2018-01-21 06:00:57,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:57,823 INFO L225 Difference]: With dead ends: 804 [2018-01-21 06:00:57,823 INFO L226 Difference]: Without dead ends: 458 [2018-01-21 06:00:57,825 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1730 GetRequests, 1645 SyntacticMatches, 18 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1324 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=764, Invalid=3928, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 06:00:57,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2018-01-21 06:00:57,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 339. [2018-01-21 06:00:57,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2018-01-21 06:00:57,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 376 transitions. [2018-01-21 06:00:57,843 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 376 transitions. Word has length 420 [2018-01-21 06:00:57,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:57,844 INFO L432 AbstractCegarLoop]: Abstraction has 339 states and 376 transitions. [2018-01-21 06:00:57,844 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 06:00:57,844 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 376 transitions. [2018-01-21 06:00:57,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2018-01-21 06:00:57,846 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:57,846 INFO L322 BasicCegarLoop]: trace histogram [78, 67, 67, 67, 67, 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 06:00:57,846 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:57,846 INFO L82 PathProgramCache]: Analyzing trace with hash 593814198, now seen corresponding path program 12 times [2018-01-21 06:00:57,846 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:57,847 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:57,847 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:57,847 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:57,847 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:57,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:57,881 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:58,577 INFO L134 CoverageAnalysis]: Checked inductivity of 13156 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 12859 trivial. 0 not checked. [2018-01-21 06:00:58,577 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:58,577 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:58,577 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:58,577 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:58,578 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:58,578 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:58,587 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:00:58,587 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:00:58,612 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,616 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,619 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,623 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,627 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,632 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,638 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,645 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,655 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,666 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,675 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,683 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,692 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,701 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,711 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,721 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,733 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,743 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,754 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:58,756 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:58,763 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:58,993 INFO L134 CoverageAnalysis]: Checked inductivity of 13156 backedges. 2730 proven. 156 refuted. 0 times theorem prover too weak. 10270 trivial. 0 not checked. [2018-01-21 06:00:58,993 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:59,478 INFO L134 CoverageAnalysis]: Checked inductivity of 13156 backedges. 2730 proven. 156 refuted. 0 times theorem prover too weak. 10270 trivial. 0 not checked. [2018-01-21 06:00:59,512 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:59,512 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:59,515 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:00:59,515 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:00:59,565 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:59,580 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:59,605 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:59,632 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:59,685 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:59,770 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:00,171 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:03,942 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:15,982 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:28,040 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown