java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-10 02:59:02,983 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-10 02:59:02,985 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-10 02:59:02,996 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-10 02:59:02,997 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-10 02:59:02,998 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-10 02:59:02,999 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-10 02:59:03,001 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-10 02:59:03,003 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-10 02:59:03,003 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-10 02:59:03,004 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-10 02:59:03,006 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-10 02:59:03,006 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-10 02:59:03,007 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-10 02:59:03,008 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-10 02:59:03,009 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-10 02:59:03,009 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-10 02:59:03,010 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-10 02:59:03,012 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-10 02:59:03,014 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-10 02:59:03,019 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-10 02:59:03,020 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-10 02:59:03,021 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-10 02:59:03,022 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-10 02:59:03,027 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-10 02:59:03,034 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-10 02:59:03,035 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-10 02:59:03,036 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-10 02:59:03,036 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-10 02:59:03,051 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-10 02:59:03,051 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-10 02:59:03,052 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-10 02:59:03,052 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-10 02:59:03,053 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-10 02:59:03,053 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-10 02:59:03,053 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-10 02:59:03,053 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-10 02:59:03,054 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-10 02:59:03,054 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-10 02:59:03,054 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-10 02:59:03,055 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-10 02:59:03,055 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-10 02:59:03,055 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-10 02:59:03,055 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-10 02:59:03,055 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-10 02:59:03,056 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-10 02:59:03,056 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-10 02:59:03,056 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-10 02:59:03,056 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-10 02:59:03,057 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-10 02:59:03,057 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-10 02:59:03,057 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-10 02:59:03,057 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-10 02:59:03,057 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-10 02:59:03,058 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-10 02:59:03,058 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-10 02:59:03,058 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-10 02:59:03,058 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-10 02:59:03,058 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-10 02:59:03,092 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-10 02:59:03,104 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-10 02:59:03,108 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-10 02:59:03,109 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-10 02:59:03,110 INFO L275 PluginConnector]: CDTParser initialized [2019-09-10 02:59:03,110 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2019-09-10 02:59:03,169 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e28c60820/4febc9c7dd4b461a890523c1523141e1/FLAG9f1e7f5dc [2019-09-10 02:59:03,587 INFO L306 CDTParser]: Found 1 translation units. [2019-09-10 02:59:03,588 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2019-09-10 02:59:03,595 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e28c60820/4febc9c7dd4b461a890523c1523141e1/FLAG9f1e7f5dc [2019-09-10 02:59:04,000 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e28c60820/4febc9c7dd4b461a890523c1523141e1 [2019-09-10 02:59:04,011 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-10 02:59:04,013 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-10 02:59:04,016 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-10 02:59:04,016 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-10 02:59:04,020 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-10 02:59:04,021 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 02:59:04" (1/1) ... [2019-09-10 02:59:04,024 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d198c3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04, skipping insertion in model container [2019-09-10 02:59:04,025 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 02:59:04" (1/1) ... [2019-09-10 02:59:04,032 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-10 02:59:04,054 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-10 02:59:04,234 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 02:59:04,238 INFO L188 MainTranslator]: Completed pre-run [2019-09-10 02:59:04,253 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 02:59:04,266 INFO L192 MainTranslator]: Completed translation [2019-09-10 02:59:04,266 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04 WrapperNode [2019-09-10 02:59:04,266 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-10 02:59:04,267 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-10 02:59:04,267 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-10 02:59:04,267 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-10 02:59:04,365 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04" (1/1) ... [2019-09-10 02:59:04,367 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04" (1/1) ... [2019-09-10 02:59:04,378 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04" (1/1) ... [2019-09-10 02:59:04,378 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04" (1/1) ... [2019-09-10 02:59:04,381 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04" (1/1) ... [2019-09-10 02:59:04,383 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04" (1/1) ... [2019-09-10 02:59:04,384 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04" (1/1) ... [2019-09-10 02:59:04,386 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-10 02:59:04,386 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-10 02:59:04,386 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-10 02:59:04,387 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-10 02:59:04,387 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04" (1/1) ... No working directory specified, using /storage/repos/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 [2019-09-10 02:59:04,442 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-10 02:59:04,442 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-10 02:59:04,443 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2019-09-10 02:59:04,443 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2019-09-10 02:59:04,443 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-10 02:59:04,443 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-10 02:59:04,443 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-10 02:59:04,443 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2019-09-10 02:59:04,443 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2019-09-10 02:59:04,443 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-10 02:59:04,444 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-10 02:59:04,444 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-10 02:59:04,627 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-10 02:59:04,627 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-09-10 02:59:04,629 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 02:59:04 BoogieIcfgContainer [2019-09-10 02:59:04,629 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-10 02:59:04,637 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-10 02:59:04,638 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-10 02:59:04,647 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-10 02:59:04,648 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.09 02:59:04" (1/3) ... [2019-09-10 02:59:04,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fad676f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 02:59:04, skipping insertion in model container [2019-09-10 02:59:04,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:59:04" (2/3) ... [2019-09-10 02:59:04,652 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fad676f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 02:59:04, skipping insertion in model container [2019-09-10 02:59:04,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 02:59:04" (3/3) ... [2019-09-10 02:59:04,658 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-1.c [2019-09-10 02:59:04,682 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-10 02:59:04,695 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-10 02:59:04,729 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-10 02:59:04,758 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-10 02:59:04,758 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-10 02:59:04,759 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-10 02:59:04,759 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-10 02:59:04,759 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-10 02:59:04,759 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-10 02:59:04,759 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-10 02:59:04,760 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-10 02:59:04,778 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2019-09-10 02:59:04,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-10 02:59:04,789 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:59:04,790 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:59:04,792 INFO L418 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:59:04,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:59:04,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2019-09-10 02:59:04,801 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:59:04,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:04,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:59:04,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:04,849 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:59:04,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:59:04,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:59:04,971 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 02:59:04,971 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-10 02:59:04,971 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:59:04,976 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-10 02:59:04,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-10 02:59:04,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-10 02:59:04,995 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2019-09-10 02:59:05,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:59:05,133 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2019-09-10 02:59:05,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-10 02:59:05,137 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-09-10 02:59:05,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:59:05,150 INFO L225 Difference]: With dead ends: 35 [2019-09-10 02:59:05,150 INFO L226 Difference]: Without dead ends: 30 [2019-09-10 02:59:05,153 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-10 02:59:05,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-09-10 02:59:05,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-09-10 02:59:05,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-09-10 02:59:05,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2019-09-10 02:59:05,203 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2019-09-10 02:59:05,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:59:05,204 INFO L475 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2019-09-10 02:59:05,204 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-10 02:59:05,204 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2019-09-10 02:59:05,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-10 02:59:05,206 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:59:05,207 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:59:05,207 INFO L418 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:59:05,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:59:05,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2019-09-10 02:59:05,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:59:05,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:05,210 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:59:05,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:05,210 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:59:05,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:59:05,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:59:05,268 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 02:59:05,268 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-10 02:59:05,268 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:59:05,270 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-10 02:59:05,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-10 02:59:05,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-10 02:59:05,271 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2019-09-10 02:59:05,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:59:05,368 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2019-09-10 02:59:05,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-10 02:59:05,369 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2019-09-10 02:59:05,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:59:05,372 INFO L225 Difference]: With dead ends: 32 [2019-09-10 02:59:05,372 INFO L226 Difference]: Without dead ends: 32 [2019-09-10 02:59:05,374 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-10 02:59:05,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-09-10 02:59:05,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2019-09-10 02:59:05,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-09-10 02:59:05,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2019-09-10 02:59:05,382 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2019-09-10 02:59:05,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:59:05,383 INFO L475 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2019-09-10 02:59:05,384 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-10 02:59:05,384 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2019-09-10 02:59:05,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-09-10 02:59:05,387 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:59:05,387 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:59:05,387 INFO L418 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:59:05,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:59:05,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2019-09-10 02:59:05,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:59:05,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:05,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:59:05,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:05,393 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:59:05,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:59:05,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-10 02:59:05,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:59:05,513 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:59:05,514 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 27 with the following transitions: [2019-09-10 02:59:05,516 INFO L207 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [31], [32], [36], [40], [42], [44], [45], [46], [47], [48], [50], [51], [56], [57], [58], [59] [2019-09-10 02:59:05,556 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 02:59:05,556 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 02:59:05,635 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-09-10 02:59:05,638 INFO L272 AbstractInterpreter]: Visited 12 different actions 12 times. Never merged. Never widened. Performed 8 root evaluator evaluations with a maximum evaluation depth of 3. Performed 8 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 5 variables. [2019-09-10 02:59:05,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:59:05,643 INFO L403 sIntCurrentIteration]: Generating AbsInt predicates [2019-09-10 02:59:05,721 INFO L227 lantSequenceWeakener]: Weakened 4 states. On average, predicates are now at 50% of their original sizes. [2019-09-10 02:59:05,721 INFO L418 sIntCurrentIteration]: Unifying AI predicates [2019-09-10 02:59:05,761 INFO L420 sIntCurrentIteration]: We unified 25 AI predicates to 25 [2019-09-10 02:59:05,762 INFO L429 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-09-10 02:59:05,763 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-10 02:59:05,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2019-09-10 02:59:05,763 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:59:05,764 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-10 02:59:05,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-10 02:59:05,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-09-10 02:59:05,764 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 7 states. [2019-09-10 02:59:05,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:59:05,970 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2019-09-10 02:59:05,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-10 02:59:05,970 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2019-09-10 02:59:05,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:59:05,972 INFO L225 Difference]: With dead ends: 48 [2019-09-10 02:59:05,972 INFO L226 Difference]: Without dead ends: 48 [2019-09-10 02:59:05,973 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-09-10 02:59:05,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-09-10 02:59:05,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2019-09-10 02:59:05,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-09-10 02:59:05,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2019-09-10 02:59:05,983 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 26 [2019-09-10 02:59:05,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:59:05,984 INFO L475 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2019-09-10 02:59:05,984 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-10 02:59:05,984 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2019-09-10 02:59:05,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-09-10 02:59:05,986 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:59:05,986 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 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] [2019-09-10 02:59:05,987 INFO L418 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:59:05,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:59:05,987 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2019-09-10 02:59:05,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:59:05,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:05,989 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:59:05,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:05,989 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:59:06,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:59:06,103 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-09-10 02:59:06,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:59:06,104 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:59:06,104 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2019-09-10 02:59:06,105 INFO L207 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [26], [28], [30], [31], [32], [35], [36], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2019-09-10 02:59:06,107 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 02:59:06,107 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 02:59:06,392 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-09-10 02:59:06,394 INFO L272 AbstractInterpreter]: Visited 28 different actions 693 times. Merged at 4 different actions 26 times. Widened at 4 different actions 66 times. Performed 702 root evaluator evaluations with a maximum evaluation depth of 3. Performed 702 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 42 fixpoints after 8 different actions. Largest state had 5 variables. [2019-09-10 02:59:06,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:59:06,395 INFO L403 sIntCurrentIteration]: Generating AbsInt predicates [2019-09-10 02:59:06,408 INFO L227 lantSequenceWeakener]: Weakened 7 states. On average, predicates are now at 50% of their original sizes. [2019-09-10 02:59:06,408 INFO L418 sIntCurrentIteration]: Unifying AI predicates [2019-09-10 02:59:06,444 INFO L420 sIntCurrentIteration]: We unified 38 AI predicates to 38 [2019-09-10 02:59:06,444 INFO L429 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-09-10 02:59:06,444 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-10 02:59:06,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [6] total 13 [2019-09-10 02:59:06,445 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:59:06,445 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-10 02:59:06,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-10 02:59:06,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2019-09-10 02:59:06,447 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 9 states. [2019-09-10 02:59:06,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:59:06,705 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2019-09-10 02:59:06,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-10 02:59:06,705 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 39 [2019-09-10 02:59:06,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:59:06,707 INFO L225 Difference]: With dead ends: 55 [2019-09-10 02:59:06,707 INFO L226 Difference]: Without dead ends: 55 [2019-09-10 02:59:06,707 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2019-09-10 02:59:06,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-09-10 02:59:06,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-09-10 02:59:06,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-09-10 02:59:06,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2019-09-10 02:59:06,716 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2019-09-10 02:59:06,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:59:06,716 INFO L475 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2019-09-10 02:59:06,717 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-10 02:59:06,717 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2019-09-10 02:59:06,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-09-10 02:59:06,719 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:59:06,719 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 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] [2019-09-10 02:59:06,719 INFO L418 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:59:06,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:59:06,720 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2019-09-10 02:59:06,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:59:06,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:06,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:59:06,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:06,722 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:59:06,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:59:06,822 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-09-10 02:59:06,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:59:06,824 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:59:06,824 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:59:06,825 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:59:06,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:59:06,826 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/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) [2019-09-10 02:59:06,850 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:59:06,851 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:59:06,894 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-09-10 02:59:06,895 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:59:06,896 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2019-09-10 02:59:06,905 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:59:07,051 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2019-09-10 02:59:07,051 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:59:07,341 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 02:59:07,430 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 02:59:07,518 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-09-10 02:59:07,526 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:59:07,526 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 15 [2019-09-10 02:59:07,526 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:59:07,528 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-10 02:59:07,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-10 02:59:07,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2019-09-10 02:59:07,531 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 11 states. [2019-09-10 02:59:07,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:59:07,828 INFO L93 Difference]: Finished difference Result 84 states and 117 transitions. [2019-09-10 02:59:07,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-10 02:59:07,831 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 52 [2019-09-10 02:59:07,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:59:07,833 INFO L225 Difference]: With dead ends: 84 [2019-09-10 02:59:07,833 INFO L226 Difference]: Without dead ends: 76 [2019-09-10 02:59:07,834 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 92 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2019-09-10 02:59:07,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-09-10 02:59:07,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 59. [2019-09-10 02:59:07,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-09-10 02:59:07,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 70 transitions. [2019-09-10 02:59:07,846 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 70 transitions. Word has length 52 [2019-09-10 02:59:07,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:59:07,847 INFO L475 AbstractCegarLoop]: Abstraction has 59 states and 70 transitions. [2019-09-10 02:59:07,847 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-10 02:59:07,847 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 70 transitions. [2019-09-10 02:59:07,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-09-10 02:59:07,849 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:59:07,850 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 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] [2019-09-10 02:59:07,850 INFO L418 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:59:07,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:59:07,850 INFO L82 PathProgramCache]: Analyzing trace with hash -242988780, now seen corresponding path program 1 times [2019-09-10 02:59:07,851 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:59:07,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:07,852 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:59:07,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:59:07,852 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:59:07,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:59:07,972 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 13 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-09-10 02:59:07,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:59:07,973 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:59:07,973 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 56 with the following transitions: [2019-09-10 02:59:07,973 INFO L207 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [25], [26], [28], [30], [31], [32], [36], [39], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2019-09-10 02:59:07,975 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 02:59:07,976 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 03:06:23,512 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-09-10 03:06:23,512 INFO L272 AbstractInterpreter]: Visited 29 different actions 6370763 times. Merged at 11 different actions 1428278 times. Widened at 4 different actions 486466 times. Performed 7749323 root evaluator evaluations with a maximum evaluation depth of 3. Performed 7749323 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 642617 fixpoints after 10 different actions. Largest state had 5 variables. [2019-09-10 03:06:23,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:23,513 INFO L403 sIntCurrentIteration]: Generating AbsInt predicates [2019-09-10 03:06:23,526 INFO L227 lantSequenceWeakener]: Weakened 16 states. On average, predicates are now at 50% of their original sizes. [2019-09-10 03:06:23,527 INFO L418 sIntCurrentIteration]: Unifying AI predicates [2019-09-10 03:06:23,642 INFO L420 sIntCurrentIteration]: We unified 54 AI predicates to 54 [2019-09-10 03:06:23,642 INFO L429 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-09-10 03:06:23,643 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-10 03:06:23,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [15] imperfect sequences [8] total 21 [2019-09-10 03:06:23,643 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 03:06:23,643 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-10 03:06:23,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-10 03:06:23,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2019-09-10 03:06:23,644 INFO L87 Difference]: Start difference. First operand 59 states and 70 transitions. Second operand 15 states. [2019-09-10 03:06:24,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 03:06:24,219 INFO L93 Difference]: Finished difference Result 77 states and 93 transitions. [2019-09-10 03:06:24,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-10 03:06:24,220 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 55 [2019-09-10 03:06:24,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 03:06:24,221 INFO L225 Difference]: With dead ends: 77 [2019-09-10 03:06:24,221 INFO L226 Difference]: Without dead ends: 77 [2019-09-10 03:06:24,222 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=332, Unknown=0, NotChecked=0, Total=380 [2019-09-10 03:06:24,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-09-10 03:06:24,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2019-09-10 03:06:24,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-09-10 03:06:24,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 93 transitions. [2019-09-10 03:06:24,232 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 93 transitions. Word has length 55 [2019-09-10 03:06:24,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 03:06:24,232 INFO L475 AbstractCegarLoop]: Abstraction has 77 states and 93 transitions. [2019-09-10 03:06:24,232 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-10 03:06:24,233 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 93 transitions. [2019-09-10 03:06:24,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2019-09-10 03:06:24,236 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:06:24,236 INFO L399 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 03:06:24,237 INFO L418 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:06:24,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:06:24,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1937391112, now seen corresponding path program 1 times [2019-09-10 03:06:24,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:06:24,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:24,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:06:24,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:06:24,239 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:06:24,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:06:24,313 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 39 proven. 19 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-09-10 03:06:24,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 03:06:24,314 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 03:06:24,314 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 81 with the following transitions: [2019-09-10 03:06:24,314 INFO L207 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [22], [25], [26], [28], [30], [31], [32], [35], [36], [39], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2019-09-10 03:06:24,316 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 03:06:24,316 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)