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/loops/n.c11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 20:36:44,033 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 20:36:44,035 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 20:36:44,047 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-03 20:36:44,047 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-03 20:36:44,048 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-03 20:36:44,049 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-03 20:36:44,051 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-03 20:36:44,053 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-03 20:36:44,054 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-03 20:36:44,054 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-03 20:36:44,056 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-03 20:36:44,056 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 20:36:44,057 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 20:36:44,058 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 20:36:44,059 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 20:36:44,059 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 20:36:44,060 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 20:36:44,062 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 20:36:44,064 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 20:36:44,065 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 20:36:44,066 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 20:36:44,067 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 20:36:44,068 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 20:36:44,070 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-03 20:36:44,073 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-03 20:36:44,074 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-03 20:36:44,075 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-03 20:36:44,075 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-03 20:36:44,076 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-03 20:36:44,077 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-03 20:36:44,077 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-03 20:36:44,077 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-03 20:36:44,078 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 20:36:44,078 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 20:36:44,079 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 20:36:44,080 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 [2019-09-03 20:36:44,094 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 20:36:44,094 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 20:36:44,095 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-03 20:36:44,095 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-03 20:36:44,095 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-03 20:36:44,096 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-03 20:36:44,096 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-03 20:36:44,096 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-03 20:36:44,096 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-03 20:36:44,096 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-03 20:36:44,097 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 20:36:44,097 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 20:36:44,097 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 20:36:44,098 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 20:36:44,098 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 20:36:44,098 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 20:36:44,098 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 20:36:44,099 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 20:36:44,099 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 20:36:44,099 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 20:36:44,099 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 20:36:44,100 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-03 20:36:44,100 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 20:36:44,100 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 20:36:44,100 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 20:36:44,100 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 20:36:44,101 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-03 20:36:44,101 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 20:36:44,101 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 20:36:44,101 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-03 20:36:44,136 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 20:36:44,148 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 20:36:44,151 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 20:36:44,153 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 20:36:44,153 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 20:36:44,154 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/n.c11.c [2019-09-03 20:36:44,212 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cbba888d/c1b76f662d8d4003a84a8b904a32842f/FLAG1d1d3dc08 [2019-09-03 20:36:44,625 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 20:36:44,626 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c11.c [2019-09-03 20:36:44,632 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cbba888d/c1b76f662d8d4003a84a8b904a32842f/FLAG1d1d3dc08 [2019-09-03 20:36:45,049 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cbba888d/c1b76f662d8d4003a84a8b904a32842f [2019-09-03 20:36:45,059 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 20:36:45,060 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 20:36:45,061 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 20:36:45,061 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 20:36:45,065 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 20:36:45,066 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:36:45" (1/1) ... [2019-09-03 20:36:45,068 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39e607a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45, skipping insertion in model container [2019-09-03 20:36:45,069 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:36:45" (1/1) ... [2019-09-03 20:36:45,076 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 20:36:45,093 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 20:36:45,272 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:36:45,275 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 20:36:45,289 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:36:45,300 INFO L192 MainTranslator]: Completed translation [2019-09-03 20:36:45,301 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45 WrapperNode [2019-09-03 20:36:45,301 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 20:36:45,302 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 20:36:45,302 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 20:36:45,302 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 20:36:45,401 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45" (1/1) ... [2019-09-03 20:36:45,402 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45" (1/1) ... [2019-09-03 20:36:45,406 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45" (1/1) ... [2019-09-03 20:36:45,406 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45" (1/1) ... [2019-09-03 20:36:45,410 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45" (1/1) ... [2019-09-03 20:36:45,415 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45" (1/1) ... [2019-09-03 20:36:45,415 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45" (1/1) ... [2019-09-03 20:36:45,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 20:36:45,417 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 20:36:45,417 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 20:36:45,418 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 20:36:45,418 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45" (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 [2019-09-03 20:36:45,466 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 20:36:45,466 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 20:36:45,466 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 20:36:45,466 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 20:36:45,467 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 20:36:45,467 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 20:36:45,467 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2019-09-03 20:36:45,467 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 20:36:45,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 20:36:45,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 20:36:45,628 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 20:36:45,628 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-03 20:36:45,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:36:45 BoogieIcfgContainer [2019-09-03 20:36:45,630 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 20:36:45,631 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 20:36:45,631 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 20:36:45,634 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 20:36:45,634 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 08:36:45" (1/3) ... [2019-09-03 20:36:45,635 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2278aeed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:36:45, skipping insertion in model container [2019-09-03 20:36:45,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:36:45" (2/3) ... [2019-09-03 20:36:45,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2278aeed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:36:45, skipping insertion in model container [2019-09-03 20:36:45,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:36:45" (3/3) ... [2019-09-03 20:36:45,637 INFO L109 eAbstractionObserver]: Analyzing ICFG n.c11.c [2019-09-03 20:36:45,647 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 20:36:45,654 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 20:36:45,671 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 20:36:45,712 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 20:36:45,712 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-03 20:36:45,712 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 20:36:45,712 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 20:36:45,712 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 20:36:45,713 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 20:36:45,713 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 20:36:45,713 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 20:36:45,738 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-09-03 20:36:45,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-03 20:36:45,750 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:36:45,751 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:36:45,754 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:36:45,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:36:45,761 INFO L82 PathProgramCache]: Analyzing trace with hash -147882559, now seen corresponding path program 1 times [2019-09-03 20:36:45,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:36:45,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:45,817 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:36:45,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:45,818 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:36:45,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:36:45,876 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:45,878 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:36:45,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-03 20:36:45,878 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:36:45,883 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-03 20:36:45,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-03 20:36:45,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-03 20:36:45,900 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-09-03 20:36:45,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:36:45,915 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2019-09-03 20:36:45,915 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-03 20:36:45,917 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-03 20:36:45,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:36:45,924 INFO L225 Difference]: With dead ends: 20 [2019-09-03 20:36:45,924 INFO L226 Difference]: Without dead ends: 13 [2019-09-03 20:36:45,926 INFO L628 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 [2019-09-03 20:36:45,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-03 20:36:45,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-03 20:36:45,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-03 20:36:45,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-09-03 20:36:45,959 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-09-03 20:36:45,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:36:45,960 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-09-03 20:36:45,960 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-03 20:36:45,960 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-09-03 20:36:45,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-03 20:36:45,961 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:36:45,961 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:36:45,961 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:36:45,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:36:45,962 INFO L82 PathProgramCache]: Analyzing trace with hash -158041290, now seen corresponding path program 1 times [2019-09-03 20:36:45,962 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:36:45,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:45,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:36:45,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:45,964 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:36:45,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:36:46,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:46,093 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:36:46,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-03 20:36:46,093 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:36:46,095 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 20:36:46,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 20:36:46,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-03 20:36:46,096 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2019-09-03 20:36:46,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:36:46,151 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2019-09-03 20:36:46,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 20:36:46,152 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-09-03 20:36:46,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:36:46,153 INFO L225 Difference]: With dead ends: 19 [2019-09-03 20:36:46,153 INFO L226 Difference]: Without dead ends: 16 [2019-09-03 20:36:46,154 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 [2019-09-03 20:36:46,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-03 20:36:46,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-09-03 20:36:46,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-03 20:36:46,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-09-03 20:36:46,158 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2019-09-03 20:36:46,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:36:46,159 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-09-03 20:36:46,159 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 20:36:46,159 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-09-03 20:36:46,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-03 20:36:46,160 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:36:46,160 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:36:46,160 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:36:46,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:36:46,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1776138601, now seen corresponding path program 1 times [2019-09-03 20:36:46,161 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:36:46,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:46,162 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:36:46,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:46,163 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:36:46,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:36:46,285 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:46,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:36:46,286 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:36:46,288 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2019-09-03 20:36:46,290 INFO L207 CegarAbsIntRunner]: [0], [4], [11], [13], [18], [20], [27], [30], [32], [38], [39], [40], [42] [2019-09-03 20:36:46,322 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 20:36:46,323 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 20:36:46,380 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-03 20:36:46,490 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 20:36:46,493 INFO L272 AbstractInterpreter]: Visited 13 different actions 69 times. Merged at 4 different actions 28 times. Widened at 1 different actions 5 times. Performed 109 root evaluator evaluations with a maximum evaluation depth of 6. Performed 109 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2019-09-03 20:36:46,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:36:46,498 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 20:36:46,498 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:36:46,498 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) [2019-09-03 20:36:46,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:36:46,528 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:36:46,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:36:46,543 INFO L256 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-03 20:36:46,548 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:36:46,585 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:36:46,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:46,624 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:36:46,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:46,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:36:46,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2019-09-03 20:36:46,686 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:36:46,687 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-03 20:36:46,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-03 20:36:46,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2019-09-03 20:36:46,688 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 9 states. [2019-09-03 20:36:46,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:36:46,751 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2019-09-03 20:36:46,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 20:36:46,752 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 13 [2019-09-03 20:36:46,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:36:46,753 INFO L225 Difference]: With dead ends: 22 [2019-09-03 20:36:46,753 INFO L226 Difference]: Without dead ends: 19 [2019-09-03 20:36:46,754 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2019-09-03 20:36:46,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-03 20:36:46,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2019-09-03 20:36:46,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-09-03 20:36:46,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-09-03 20:36:46,758 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2019-09-03 20:36:46,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:36:46,759 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-09-03 20:36:46,759 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-03 20:36:46,759 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-09-03 20:36:46,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-03 20:36:46,760 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:36:46,760 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:36:46,760 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:36:46,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:36:46,761 INFO L82 PathProgramCache]: Analyzing trace with hash 199799702, now seen corresponding path program 2 times [2019-09-03 20:36:46,761 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:36:46,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:46,762 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:36:46,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:46,763 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:36:46,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:36:46,920 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:46,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:36:46,921 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:36:46,922 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:36:46,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:36:46,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:36:46,922 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 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:36:46,946 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:36:46,946 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:36:46,965 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-09-03 20:36:46,966 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:36:46,967 INFO L256 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-03 20:36:46,968 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:36:46,995 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:36:47,026 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:47,026 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:36:47,160 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (3)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 20:36:47,164 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:36:47,164 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8] total 14 [2019-09-03 20:36:47,164 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:36:47,165 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-03 20:36:47,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-03 20:36:47,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2019-09-03 20:36:47,166 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 10 states. [2019-09-03 20:36:47,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:36:47,248 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2019-09-03 20:36:47,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-03 20:36:47,249 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2019-09-03 20:36:47,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:36:47,250 INFO L225 Difference]: With dead ends: 25 [2019-09-03 20:36:47,250 INFO L226 Difference]: Without dead ends: 22 [2019-09-03 20:36:47,251 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2019-09-03 20:36:47,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-09-03 20:36:47,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2019-09-03 20:36:47,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-09-03 20:36:47,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2019-09-03 20:36:47,254 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2019-09-03 20:36:47,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:36:47,255 INFO L475 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2019-09-03 20:36:47,255 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-03 20:36:47,255 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2019-09-03 20:36:47,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-03 20:36:47,256 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:36:47,256 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:36:47,256 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:36:47,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:36:47,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1443974601, now seen corresponding path program 3 times [2019-09-03 20:36:47,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:36:47,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:47,258 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:36:47,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:47,258 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:36:47,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:36:47,398 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:47,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:36:47,398 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:36:47,399 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:36:47,399 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:36:47,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:36:47,399 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 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 [2019-09-03 20:36:47,421 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:36:47,421 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 20:36:47,433 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:36:47,433 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:36:47,434 INFO L256 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 14 conjunts are in the unsatisfiable core [2019-09-03 20:36:47,435 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:36:47,454 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:36:47,476 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:47,476 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:36:47,560 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:47,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:36:47,564 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2019-09-03 20:36:47,564 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:36:47,564 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-03 20:36:47,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-03 20:36:47,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2019-09-03 20:36:47,565 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2019-09-03 20:36:47,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:36:47,655 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2019-09-03 20:36:47,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-03 20:36:47,656 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2019-09-03 20:36:47,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:36:47,657 INFO L225 Difference]: With dead ends: 28 [2019-09-03 20:36:47,657 INFO L226 Difference]: Without dead ends: 25 [2019-09-03 20:36:47,658 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2019-09-03 20:36:47,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-09-03 20:36:47,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-09-03 20:36:47,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-09-03 20:36:47,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-09-03 20:36:47,664 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2019-09-03 20:36:47,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:36:47,665 INFO L475 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-09-03 20:36:47,665 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-03 20:36:47,665 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-09-03 20:36:47,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-03 20:36:47,665 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:36:47,666 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:36:47,666 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:36:47,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:36:47,667 INFO L82 PathProgramCache]: Analyzing trace with hash 92873718, now seen corresponding path program 4 times [2019-09-03 20:36:47,667 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:36:47,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:47,668 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:36:47,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:36:47,668 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:36:47,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:36:47,852 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:47,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:36:47,853 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:36:47,853 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:36:47,853 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:36:47,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:36:47,853 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:36:47,866 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:36:47,867 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:36:47,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:36:47,880 INFO L256 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 16 conjunts are in the unsatisfiable core [2019-09-03 20:36:47,882 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:36:47,912 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:36:47,937 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:47,938 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:36:48,040 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:36:48,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:36:48,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2019-09-03 20:36:48,046 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:36:48,046 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-03 20:36:48,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-03 20:36:48,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2019-09-03 20:36:48,047 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 12 states. [2019-09-03 20:36:48,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:36:48,163 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-09-03 20:36:48,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-03 20:36:48,164 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2019-09-03 20:36:48,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:36:48,164 INFO L225 Difference]: With dead ends: 22 [2019-09-03 20:36:48,165 INFO L226 Difference]: Without dead ends: 0 [2019-09-03 20:36:48,165 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2019-09-03 20:36:48,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-03 20:36:48,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-03 20:36:48,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-03 20:36:48,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-03 20:36:48,166 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 22 [2019-09-03 20:36:48,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:36:48,166 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-03 20:36:48,166 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-03 20:36:48,167 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-03 20:36:48,167 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-03 20:36:48,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.09 08:36:48 BoogieIcfgContainer [2019-09-03 20:36:48,171 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-03 20:36:48,173 INFO L168 Benchmark]: Toolchain (without parser) took 3112.61 ms. Allocated memory was 132.1 MB in the beginning and 216.0 MB in the end (delta: 83.9 MB). Free memory was 84.7 MB in the beginning and 72.4 MB in the end (delta: 12.4 MB). Peak memory consumption was 96.2 MB. Max. memory is 7.1 GB. [2019-09-03 20:36:48,174 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 132.1 MB. Free memory was 103.1 MB in the beginning and 102.9 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-03 20:36:48,175 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.31 ms. Allocated memory is still 132.1 MB. Free memory was 84.5 MB in the beginning and 75.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2019-09-03 20:36:48,176 INFO L168 Benchmark]: Boogie Preprocessor took 115.16 ms. Allocated memory was 132.1 MB in the beginning and 197.7 MB in the end (delta: 65.5 MB). Free memory was 75.2 MB in the beginning and 174.5 MB in the end (delta: -99.3 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2019-09-03 20:36:48,177 INFO L168 Benchmark]: RCFGBuilder took 212.83 ms. Allocated memory is still 197.7 MB. Free memory was 174.5 MB in the beginning and 163.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2019-09-03 20:36:48,178 INFO L168 Benchmark]: TraceAbstraction took 2540.28 ms. Allocated memory was 197.7 MB in the beginning and 216.0 MB in the end (delta: 18.4 MB). Free memory was 163.6 MB in the beginning and 72.4 MB in the end (delta: 91.3 MB). Peak memory consumption was 109.6 MB. Max. memory is 7.1 GB. [2019-09-03 20:36:48,182 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 132.1 MB. Free memory was 103.1 MB in the beginning and 102.9 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 240.31 ms. Allocated memory is still 132.1 MB. Free memory was 84.5 MB in the beginning and 75.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 115.16 ms. Allocated memory was 132.1 MB in the beginning and 197.7 MB in the end (delta: 65.5 MB). Free memory was 75.2 MB in the beginning and 174.5 MB in the end (delta: -99.3 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 212.83 ms. Allocated memory is still 197.7 MB. Free memory was 174.5 MB in the beginning and 163.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2540.28 ms. Allocated memory was 197.7 MB in the beginning and 216.0 MB in the end (delta: 18.4 MB). Free memory was 163.6 MB in the beginning and 72.4 MB in the end (delta: 91.3 MB). Peak memory consumption was 109.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 2.4s OverallTime, 6 OverallIterations, 4 TraceHistogramMax, 0.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 83 SDtfs, 39 SDslu, 331 SDs, 0 SdLazy, 261 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 178 GetRequests, 116 SyntacticMatches, 5 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 4 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 160 NumberOfCodeBlocks, 160 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 216 ConstructedInterpolants, 0 QuantifiedInterpolants, 17754 SizeOfPredicates, 8 NumberOfNonLiveVariables, 142 ConjunctsInSsa, 53 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 2/120 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...