/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/check_removal_from_set_after_insertion.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 23:18:53,235 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 23:18:53,238 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 23:18:53,257 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-23 23:18:53,257 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-23 23:18:53,259 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-23 23:18:53,261 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-23 23:18:53,271 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-23 23:18:53,275 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-23 23:18:53,278 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-23 23:18:53,280 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-23 23:18:53,282 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-11-23 23:18:53,323 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2019-11-23 23:18:53,352 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 23:18:53,353 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 23:18:53,354 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-23 23:18:53,354 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-23 23:18:53,354 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-23 23:18:53,354 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-23 23:18:53,354 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-23 23:18:53,355 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-23 23:18:53,355 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-23 23:18:53,355 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-23 23:18:53,356 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-23 23:18:53,356 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-23 23:18:53,356 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-23 23:18:53,357 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-23 23:18:53,357 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-23 23:18:53,358 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 23:18:53,359 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 23:18:53,359 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 23:18:53,359 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 23:18:53,359 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 23:18:53,359 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 23:18:53,360 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 23:18:53,360 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 23:18:53,360 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 23:18:53,360 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 23:18:53,360 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 23:18:53,360 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 23:18:53,361 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 23:18:53,362 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 23:18:53,362 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 23:18:53,362 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 23:18:53,362 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 23:18:53,362 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 23:18:53,363 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-23 23:18:53,363 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 23:18:53,363 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 23:18:53,364 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 23:18:53,364 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-23 23:18:53,680 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 23:18:53,704 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 23:18:53,707 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 23:18:53,708 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 23:18:53,709 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 23:18:53,710 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/check_removal_from_set_after_insertion.c [2019-11-23 23:18:53,769 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/afe16745d/5396f4ab72814a7694d53fcbbff941a0/FLAG2f0191fe9 [2019-11-23 23:18:54,204 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 23:18:54,205 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-industry-pattern/check_removal_from_set_after_insertion.c [2019-11-23 23:18:54,212 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/afe16745d/5396f4ab72814a7694d53fcbbff941a0/FLAG2f0191fe9 [2019-11-23 23:18:54,607 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/afe16745d/5396f4ab72814a7694d53fcbbff941a0 [2019-11-23 23:18:54,615 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 23:18:54,617 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 23:18:54,618 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 23:18:54,618 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 23:18:54,621 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 23:18:54,622 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:18:54" (1/1) ... [2019-11-23 23:18:54,625 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@429c8cbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:54, skipping insertion in model container [2019-11-23 23:18:54,625 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:18:54" (1/1) ... [2019-11-23 23:18:54,633 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 23:18:54,652 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 23:18:54,931 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:18:54,943 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 23:18:55,080 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:18:55,096 INFO L208 MainTranslator]: Completed translation [2019-11-23 23:18:55,097 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55 WrapperNode [2019-11-23 23:18:55,097 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 23:18:55,098 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 23:18:55,098 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 23:18:55,098 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 23:18:55,105 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (1/1) ... [2019-11-23 23:18:55,114 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (1/1) ... [2019-11-23 23:18:55,142 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 23:18:55,143 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 23:18:55,143 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 23:18:55,143 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 23:18:55,154 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (1/1) ... [2019-11-23 23:18:55,154 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (1/1) ... [2019-11-23 23:18:55,162 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (1/1) ... [2019-11-23 23:18:55,163 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (1/1) ... [2019-11-23 23:18:55,178 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (1/1) ... [2019-11-23 23:18:55,184 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (1/1) ... [2019-11-23 23:18:55,186 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (1/1) ... [2019-11-23 23:18:55,189 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 23:18:55,189 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 23:18:55,189 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 23:18:55,189 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 23:18:55,190 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (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 [2019-11-23 23:18:55,244 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 23:18:55,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 23:18:55,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 23:18:55,245 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 23:18:55,245 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-23 23:18:55,245 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-23 23:18:55,806 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 23:18:55,808 INFO L284 CfgBuilder]: Removed 16 assume(true) statements. [2019-11-23 23:18:55,809 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:18:55 BoogieIcfgContainer [2019-11-23 23:18:55,809 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 23:18:55,810 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 23:18:55,811 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 23:18:55,816 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 23:18:55,817 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 11:18:54" (1/3) ... [2019-11-23 23:18:55,818 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58ad9db4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:18:55, skipping insertion in model container [2019-11-23 23:18:55,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:18:55" (2/3) ... [2019-11-23 23:18:55,819 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58ad9db4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:18:55, skipping insertion in model container [2019-11-23 23:18:55,819 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:18:55" (3/3) ... [2019-11-23 23:18:55,824 INFO L109 eAbstractionObserver]: Analyzing ICFG check_removal_from_set_after_insertion.c [2019-11-23 23:18:55,834 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 23:18:55,843 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 23:18:55,855 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 23:18:55,885 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 23:18:55,886 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 23:18:55,886 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 23:18:55,886 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 23:18:55,886 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 23:18:55,886 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 23:18:55,887 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 23:18:55,887 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 23:18:55,899 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-11-23 23:18:55,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-23 23:18:55,905 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:18:55,906 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:18:55,906 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:18:55,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:18:55,911 INFO L82 PathProgramCache]: Analyzing trace with hash 268453792, now seen corresponding path program 1 times [2019-11-23 23:18:55,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:18:55,919 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485211841] [2019-11-23 23:18:55,920 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:18:56,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:18:56,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:18:56,070 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485211841] [2019-11-23 23:18:56,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:18:56,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 23:18:56,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091609816] [2019-11-23 23:18:56,078 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:18:56,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:18:56,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:18:56,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:18:56,091 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-11-23 23:18:56,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:18:56,149 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2019-11-23 23:18:56,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:18:56,151 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2019-11-23 23:18:56,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:18:56,162 INFO L225 Difference]: With dead ends: 31 [2019-11-23 23:18:56,162 INFO L226 Difference]: Without dead ends: 16 [2019-11-23 23:18:56,165 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:18:56,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-23 23:18:56,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-11-23 23:18:56,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-23 23:18:56,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 22 transitions. [2019-11-23 23:18:56,201 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 22 transitions. Word has length 9 [2019-11-23 23:18:56,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:18:56,201 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 22 transitions. [2019-11-23 23:18:56,202 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:18:56,202 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 22 transitions. [2019-11-23 23:18:56,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-23 23:18:56,202 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:18:56,203 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:18:56,203 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:18:56,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:18:56,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1499628069, now seen corresponding path program 1 times [2019-11-23 23:18:56,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:18:56,204 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195393435] [2019-11-23 23:18:56,204 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:18:56,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:18:56,338 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:18:56,338 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195393435] [2019-11-23 23:18:56,340 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044201984] [2019-11-23 23:18:56,341 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:18:56,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:18:56,392 INFO L255 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 23:18:56,397 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:18:56,428 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 23:18:56,429 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:18:56,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 23:18:56,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-23 23:18:56,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [4] total 6 [2019-11-23 23:18:56,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874531372] [2019-11-23 23:18:56,449 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 23:18:56,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:18:56,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 23:18:56,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-23 23:18:56,450 INFO L87 Difference]: Start difference. First operand 16 states and 22 transitions. Second operand 4 states. [2019-11-23 23:18:56,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:18:56,511 INFO L93 Difference]: Finished difference Result 34 states and 48 transitions. [2019-11-23 23:18:56,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 23:18:56,512 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2019-11-23 23:18:56,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:18:56,513 INFO L225 Difference]: With dead ends: 34 [2019-11-23 23:18:56,513 INFO L226 Difference]: Without dead ends: 20 [2019-11-23 23:18:56,514 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-23 23:18:56,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-23 23:18:56,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2019-11-23 23:18:56,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-23 23:18:56,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 24 transitions. [2019-11-23 23:18:56,520 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 24 transitions. Word has length 11 [2019-11-23 23:18:56,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:18:56,521 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 24 transitions. [2019-11-23 23:18:56,521 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 23:18:56,521 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 24 transitions. [2019-11-23 23:18:56,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-23 23:18:56,522 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:18:56,522 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:18:56,725 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:18:56,726 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:18:56,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:18:56,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1729578587, now seen corresponding path program 1 times [2019-11-23 23:18:56,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:18:56,728 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806027835] [2019-11-23 23:18:56,729 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:18:56,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:18:56,871 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-23 23:18:56,871 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806027835] [2019-11-23 23:18:56,872 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027900572] [2019-11-23 23:18:56,872 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:18:56,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:18:56,923 INFO L255 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 23:18:56,924 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:18:56,971 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 23:18:56,972 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:18:57,021 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 23:18:57,022 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1447320051] [2019-11-23 23:18:57,060 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2019-11-23 23:18:57,061 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:18:57,066 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:18:57,072 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:18:57,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:18:58,184 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 126 [2019-11-23 23:18:58,830 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2019-11-23 23:18:58,953 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 147 [2019-11-23 23:18:59,083 WARN L192 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 147 [2019-11-23 23:19:00,028 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 166 [2019-11-23 23:19:00,164 WARN L192 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 166 [2019-11-23 23:19:02,918 WARN L192 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 192 [2019-11-23 23:19:03,069 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2019-11-23 23:19:03,213 WARN L192 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 179 [2019-11-23 23:19:05,023 WARN L192 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 194 [2019-11-23 23:19:07,088 WARN L192 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2019-11-23 23:19:09,106 WARN L192 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 201 [2019-11-23 23:19:11,050 WARN L192 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 203 [2019-11-23 23:19:11,496 WARN L192 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 191 [2019-11-23 23:19:13,718 WARN L192 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 211 DAG size of output: 211 [2019-11-23 23:19:18,373 WARN L192 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 217 DAG size of output: 216 [2019-11-23 23:19:18,602 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 202 [2019-11-23 23:19:20,850 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 219 [2019-11-23 23:19:23,260 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 223 DAG size of output: 222 [2019-11-23 23:19:25,612 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 225 [2019-11-23 23:19:28,063 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 229 DAG size of output: 228 [2019-11-23 23:19:30,525 WARN L192 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 232 DAG size of output: 231 [2019-11-23 23:19:33,034 WARN L192 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 235 [2019-11-23 23:19:35,469 WARN L192 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 238 DAG size of output: 237 [2019-11-23 23:19:38,109 WARN L192 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 240 [2019-11-23 23:19:40,787 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 244 DAG size of output: 243 [2019-11-23 23:19:44,099 WARN L192 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 252 DAG size of output: 251 [2019-11-23 23:19:47,276 WARN L192 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 254 [2019-11-23 23:19:50,912 WARN L192 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 262 DAG size of output: 261 [2019-11-23 23:19:54,407 WARN L192 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 265 [2019-11-23 23:19:57,988 WARN L192 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 266 [2019-11-23 23:20:01,596 WARN L192 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 269 [2019-11-23 23:20:05,332 WARN L192 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 272 [2019-11-23 23:20:09,065 WARN L192 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 276 DAG size of output: 275 [2019-11-23 23:20:13,142 WARN L192 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 278 [2019-11-23 23:20:13,418 WARN L192 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 268 DAG size of output: 267 [2019-11-23 23:20:17,141 WARN L192 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 282 DAG size of output: 282 [2019-11-23 23:20:21,408 WARN L192 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 284