/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-examples/standard_strcmp_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 23:14:15,397 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 23:14:15,400 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 23:14:15,414 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-23 23:14:15,414 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-23 23:14:15,416 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-23 23:14:15,418 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-23 23:14:15,427 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-23 23:14:15,429 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-23 23:14:15,430 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-23 23:14:15,431 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-23 23:14:15,432 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-23 23:14:15,433 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-23 23:14:15,433 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-23 23:14:15,434 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-23 23:14:15,435 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-23 23:14:15,436 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-23 23:14:15,437 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-23 23:14:15,438 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-23 23:14:15,440 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-23 23:14:15,441 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-23 23:14:15,442 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-23 23:14:15,443 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-23 23:14:15,444 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-23 23:14:15,446 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-23 23:14:15,454 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-23 23:14:15,455 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-23 23:14:15,455 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-23 23:14:15,456 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 23:14:15,475 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 23:14:15,476 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 23:14:15,477 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-23 23:14:15,477 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-23 23:14:15,477 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-23 23:14:15,477 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-23 23:14:15,478 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-23 23:14:15,481 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-23 23:14:15,481 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-23 23:14:15,481 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-23 23:14:15,481 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-23 23:14:15,482 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-23 23:14:15,482 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-23 23:14:15,482 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-23 23:14:15,482 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-23 23:14:15,483 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 23:14:15,483 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 23:14:15,483 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 23:14:15,484 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 23:14:15,485 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 23:14:15,485 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 23:14:15,485 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 23:14:15,485 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 23:14:15,486 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 23:14:15,486 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 23:14:15,486 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 23:14:15,486 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 23:14:15,486 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 23:14:15,487 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 23:14:15,487 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 23:14:15,488 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 23:14:15,488 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 23:14:15,488 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 23:14:15,488 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-23 23:14:15,488 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 23:14:15,489 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 23:14:15,489 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 23:14:15,489 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-23 23:14:15,797 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 23:14:15,813 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 23:14:15,817 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 23:14:15,819 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 23:14:15,819 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 23:14:15,820 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_strcmp_ground.i [2019-11-23 23:14:15,890 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6db8aac46/6c7aeb3cbb0846ecad20a44a567cef76/FLAG6a3977ef0 [2019-11-23 23:14:16,364 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 23:14:16,365 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_strcmp_ground.i [2019-11-23 23:14:16,373 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6db8aac46/6c7aeb3cbb0846ecad20a44a567cef76/FLAG6a3977ef0 [2019-11-23 23:14:16,707 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6db8aac46/6c7aeb3cbb0846ecad20a44a567cef76 [2019-11-23 23:14:16,715 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 23:14:16,716 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 23:14:16,717 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 23:14:16,717 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 23:14:16,721 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 23:14:16,722 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:16,724 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e76d925 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16, skipping insertion in model container [2019-11-23 23:14:16,725 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:16,732 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 23:14:16,750 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 23:14:16,928 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:14:16,939 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 23:14:16,961 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:14:16,978 INFO L208 MainTranslator]: Completed translation [2019-11-23 23:14:16,979 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16 WrapperNode [2019-11-23 23:14:16,979 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 23:14:16,981 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 23:14:16,981 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 23:14:16,981 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 23:14:16,989 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:16,996 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:17,118 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 23:14:17,118 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 23:14:17,119 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 23:14:17,119 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 23:14:17,129 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:17,129 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:17,131 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:17,132 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:17,137 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:17,142 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:17,143 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (1/1) ... [2019-11-23 23:14:17,146 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 23:14:17,146 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 23:14:17,146 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 23:14:17,147 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 23:14:17,147 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (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 23:14:17,207 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 23:14:17,207 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 23:14:17,207 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 23:14:17,207 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 23:14:17,208 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-23 23:14:17,208 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-23 23:14:17,585 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 23:14:17,585 INFO L284 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-23 23:14:17,586 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:14:17 BoogieIcfgContainer [2019-11-23 23:14:17,587 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 23:14:17,587 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 23:14:17,588 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 23:14:17,591 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 23:14:17,591 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 11:14:16" (1/3) ... [2019-11-23 23:14:17,592 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@481968cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:14:17, skipping insertion in model container [2019-11-23 23:14:17,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:14:16" (2/3) ... [2019-11-23 23:14:17,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@481968cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:14:17, skipping insertion in model container [2019-11-23 23:14:17,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:14:17" (3/3) ... [2019-11-23 23:14:17,595 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_strcmp_ground.i [2019-11-23 23:14:17,606 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 23:14:17,613 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 23:14:17,624 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 23:14:17,646 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 23:14:17,646 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 23:14:17,647 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 23:14:17,647 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 23:14:17,647 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 23:14:17,647 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 23:14:17,647 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 23:14:17,647 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 23:14:17,659 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2019-11-23 23:14:17,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-11-23 23:14:17,665 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:14:17,666 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:14:17,667 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:14:17,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:14:17,671 INFO L82 PathProgramCache]: Analyzing trace with hash -761197684, now seen corresponding path program 1 times [2019-11-23 23:14:17,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:14:17,680 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611725835] [2019-11-23 23:14:17,680 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:14:17,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:14:17,831 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 23:14:17,832 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611725835] [2019-11-23 23:14:17,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:14:17,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-23 23:14:17,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208461189] [2019-11-23 23:14:17,839 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:14:17,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:14:17,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:14:17,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:14:17,852 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 3 states. [2019-11-23 23:14:17,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:14:17,884 INFO L93 Difference]: Finished difference Result 25 states and 35 transitions. [2019-11-23 23:14:17,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:14:17,886 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2019-11-23 23:14:17,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:14:17,896 INFO L225 Difference]: With dead ends: 25 [2019-11-23 23:14:17,896 INFO L226 Difference]: Without dead ends: 12 [2019-11-23 23:14:17,899 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:14:17,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-11-23 23:14:17,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-11-23 23:14:17,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-11-23 23:14:17,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2019-11-23 23:14:17,929 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2019-11-23 23:14:17,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:14:17,929 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2019-11-23 23:14:17,930 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:14:17,930 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2019-11-23 23:14:17,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-23 23:14:17,930 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:14:17,931 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:14:17,931 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:14:17,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:14:17,931 INFO L82 PathProgramCache]: Analyzing trace with hash 624792783, now seen corresponding path program 1 times [2019-11-23 23:14:17,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:14:17,932 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195467682] [2019-11-23 23:14:17,932 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:14:17,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:14:17,973 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 23:14:17,974 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195467682] [2019-11-23 23:14:17,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:14:17,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 23:14:17,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799222246] [2019-11-23 23:14:17,976 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:14:17,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:14:17,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:14:17,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:14:17,978 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand 3 states. [2019-11-23 23:14:17,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:14:18,000 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2019-11-23 23:14:18,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:14:18,001 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2019-11-23 23:14:18,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:14:18,002 INFO L225 Difference]: With dead ends: 28 [2019-11-23 23:14:18,002 INFO L226 Difference]: Without dead ends: 21 [2019-11-23 23:14:18,003 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 23:14:18,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-23 23:14:18,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 13. [2019-11-23 23:14:18,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-23 23:14:18,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2019-11-23 23:14:18,008 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 9 [2019-11-23 23:14:18,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:14:18,008 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2019-11-23 23:14:18,008 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:14:18,008 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2019-11-23 23:14:18,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-23 23:14:18,009 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:14:18,009 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:14:18,010 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:14:18,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:14:18,010 INFO L82 PathProgramCache]: Analyzing trace with hash -356352674, now seen corresponding path program 1 times [2019-11-23 23:14:18,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:14:18,011 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309509038] [2019-11-23 23:14:18,011 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:14:18,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:14:18,086 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 23:14:18,087 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309509038] [2019-11-23 23:14:18,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:14:18,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-23 23:14:18,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916858884] [2019-11-23 23:14:18,088 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 23:14:18,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:14:18,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 23:14:18,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-23 23:14:18,090 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand 4 states. [2019-11-23 23:14:18,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:14:18,130 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2019-11-23 23:14:18,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 23:14:18,131 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2019-11-23 23:14:18,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:14:18,132 INFO L225 Difference]: With dead ends: 20 [2019-11-23 23:14:18,132 INFO L226 Difference]: Without dead ends: 13 [2019-11-23 23:14:18,133 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-23 23:14:18,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-11-23 23:14:18,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-11-23 23:14:18,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-23 23:14:18,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2019-11-23 23:14:18,137 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2019-11-23 23:14:18,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:14:18,138 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2019-11-23 23:14:18,138 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 23:14:18,138 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2019-11-23 23:14:18,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-23 23:14:18,139 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:14:18,139 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:14:18,139 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:14:18,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:14:18,140 INFO L82 PathProgramCache]: Analyzing trace with hash 460163316, now seen corresponding path program 1 times [2019-11-23 23:14:18,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:14:18,140 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343174232] [2019-11-23 23:14:18,140 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:14:18,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:14:18,193 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 23:14:18,194 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343174232] [2019-11-23 23:14:18,194 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252970788] [2019-11-23 23:14:18,194 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 23:14:18,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:14:18,260 INFO L255 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 23:14:18,265 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:14:18,295 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 23:14:18,296 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:14:18,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 23:14:18,328 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2086290446] [2019-11-23 23:14:18,356 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2019-11-23 23:14:18,356 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:14:18,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:14:18,371 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:14:18,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:14:21,512 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 165 [2019-11-23 23:14:21,756 WARN L192 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 169 [2019-11-23 23:14:23,534 WARN L192 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 185 [2019-11-23 23:14:26,081 WARN L192 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 196 DAG size of output: 195 [2019-11-23 23:14:30,296 WARN L192 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 199 [2019-11-23 23:14:32,536 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 202 [2019-11-23 23:14:32,774 WARN L192 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 185 [2019-11-23 23:14:35,387 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 211 [2019-11-23 23:14:35,615 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 192 [2019-11-23 23:14:38,047 WARN L192 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 214 DAG size of output: 213 [2019-11-23 23:14:47,178 WARN L192 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 236 [2019-11-23 23:14:50,550 WARN L192 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 239 [2019-11-23 23:14:54,289 WARN L192 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 247 DAG size of output: 245 [2019-11-23 23:14:58,718 WARN L192 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 255 [2019-11-23 23:14:58,959 WARN L192 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 232 DAG size of output: 231 [2019-11-23 23:15:03,002 WARN L192 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 260 [2019-11-23 23:15:07,225 WARN L192 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 262 DAG size of output: 261 [2019-11-23 23:15:11,622 WARN L192 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 263 [2019-11-23 23:15:16,021 WARN L192 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 266 [2019-11-23 23:15:20,471 WARN L192 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 271 DAG size of output: 270 [2019-11-23 23:15:25,150 WARN L192 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 272 [2019-11-23 23:15:25,360 WARN L192 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 256 DAG size of output: 252 [2019-11-23 23:15:31,150 WARN L192 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 284 [2019-11-23 23:15:36,837 WARN L192 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 292 DAG size of output: 290 [2019-11-23 23:15:37,002 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 266 [2019-11-23 23:15:42,511 WARN L192 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 295 DAG size of output: 292 [2019-11-23 23:15:49,088 WARN L192 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 309