/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/product-lines/email_spec1_product31.cil.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 04:54:57,109 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 04:54:57,111 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 04:54:57,123 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 04:54:57,123 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 04:54:57,124 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 04:54:57,126 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 04:54:57,127 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 04:54:57,129 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 04:54:57,130 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 04:54:57,131 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 04:54:57,132 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 04:54:57,132 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 04:54:57,133 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 04:54:57,134 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 04:54:57,135 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 04:54:57,136 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 04:54:57,136 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 04:54:57,138 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 04:54:57,140 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 04:54:57,141 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 04:54:57,142 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 04:54:57,143 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 04:54:57,144 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 04:54:57,147 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 04:54:57,153 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-24 04:54:57,154 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-24 04:54:57,154 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-24 04:54:57,156 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-24 04:54:57,157 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-24 04:54:57,157 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-24 04:54:57,158 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-24 04:54:57,160 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-24 04:54:57,160 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 04:54:57,161 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 04:54:57,161 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 04:54:57,162 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 [2019-11-24 04:54:57,185 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 04:54:57,185 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 04:54:57,186 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 04:54:57,186 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 04:54:57,186 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 04:54:57,187 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 04:54:57,187 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 04:54:57,187 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 04:54:57,187 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 04:54:57,187 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 04:54:57,188 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 04:54:57,189 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 04:54:57,189 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 04:54:57,189 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 04:54:57,190 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 04:54:57,191 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 04:54:57,191 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 04:54:57,191 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 04:54:57,191 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 04:54:57,192 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 04:54:57,192 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 04:54:57,192 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 04:54:57,192 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 04:54:57,193 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 04:54:57,193 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 04:54:57,193 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 04:54:57,193 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 04:54:57,193 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 04:54:57,194 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 04:54:57,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 04:54:57,195 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 04:54:57,195 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 04:54:57,195 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 04:54:57,196 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 04:54:57,196 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 04:54:57,196 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 04:54:57,196 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 04:54:57,197 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 04:54:57,468 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 04:54:57,481 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 04:54:57,484 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 04:54:57,486 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 04:54:57,486 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 04:54:57,487 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/product-lines/email_spec1_product31.cil.c [2019-11-24 04:54:57,557 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a20bc642/29ce05a470184957b1bed44cd13476ee/FLAG4fcdfd34b [2019-11-24 04:54:58,131 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 04:54:58,132 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/product-lines/email_spec1_product31.cil.c [2019-11-24 04:54:58,159 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a20bc642/29ce05a470184957b1bed44cd13476ee/FLAG4fcdfd34b [2019-11-24 04:54:58,385 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a20bc642/29ce05a470184957b1bed44cd13476ee [2019-11-24 04:54:58,393 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 04:54:58,394 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 04:54:58,395 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 04:54:58,396 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 04:54:58,399 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 04:54:58,400 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:54:58" (1/1) ... [2019-11-24 04:54:58,403 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22286c79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:58, skipping insertion in model container [2019-11-24 04:54:58,403 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:54:58" (1/1) ... [2019-11-24 04:54:58,410 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 04:54:58,489 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 04:54:59,245 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:54:59,259 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 04:54:59,422 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:54:59,565 INFO L208 MainTranslator]: Completed translation [2019-11-24 04:54:59,566 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59 WrapperNode [2019-11-24 04:54:59,566 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 04:54:59,568 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 04:54:59,568 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 04:54:59,568 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 04:54:59,582 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (1/1) ... [2019-11-24 04:54:59,651 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (1/1) ... [2019-11-24 04:54:59,788 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 04:54:59,788 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 04:54:59,788 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 04:54:59,788 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 04:54:59,799 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (1/1) ... [2019-11-24 04:54:59,799 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (1/1) ... [2019-11-24 04:54:59,819 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (1/1) ... [2019-11-24 04:54:59,820 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (1/1) ... [2019-11-24 04:54:59,887 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (1/1) ... [2019-11-24 04:54:59,935 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (1/1) ... [2019-11-24 04:54:59,955 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (1/1) ... [2019-11-24 04:54:59,979 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 04:54:59,980 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 04:54:59,980 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 04:54:59,981 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 04:54:59,982 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (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 [2019-11-24 04:55:00,055 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2019-11-24 04:55:00,057 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-24 04:55:00,058 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-11-24 04:55:00,058 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 04:55:00,058 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 04:55:08,925 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 04:55:08,925 INFO L284 CfgBuilder]: Removed 375 assume(true) statements. [2019-11-24 04:55:08,930 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:55:08 BoogieIcfgContainer [2019-11-24 04:55:08,931 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 04:55:08,933 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 04:55:08,933 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 04:55:08,938 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 04:55:08,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 04:54:58" (1/3) ... [2019-11-24 04:55:08,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31ab8663 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:55:08, skipping insertion in model container [2019-11-24 04:55:08,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:54:59" (2/3) ... [2019-11-24 04:55:08,941 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31ab8663 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:55:08, skipping insertion in model container [2019-11-24 04:55:08,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:55:08" (3/3) ... [2019-11-24 04:55:08,949 INFO L109 eAbstractionObserver]: Analyzing ICFG email_spec1_product31.cil.c [2019-11-24 04:55:08,964 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 04:55:08,978 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2019-11-24 04:55:08,994 INFO L249 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2019-11-24 04:55:09,031 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 04:55:09,032 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 04:55:09,032 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 04:55:09,033 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 04:55:09,033 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 04:55:09,033 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 04:55:09,033 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 04:55:09,034 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 04:55:09,059 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2019-11-24 04:55:09,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2019-11-24 04:55:09,076 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:09,078 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:09,078 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:09,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:09,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1017214740, now seen corresponding path program 1 times [2019-11-24 04:55:09,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:09,107 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214034304] [2019-11-24 04:55:09,107 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:09,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:09,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:09,708 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214034304] [2019-11-24 04:55:09,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:55:09,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 04:55:09,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752260166] [2019-11-24 04:55:09,719 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-24 04:55:09,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:55:09,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-24 04:55:09,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-24 04:55:09,748 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 2 states. [2019-11-24 04:55:09,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:55:09,786 INFO L93 Difference]: Finished difference Result 54 states and 87 transitions. [2019-11-24 04:55:09,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-24 04:55:09,789 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 7 [2019-11-24 04:55:09,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:55:09,811 INFO L225 Difference]: With dead ends: 54 [2019-11-24 04:55:09,812 INFO L226 Difference]: Without dead ends: 37 [2019-11-24 04:55:09,818 INFO L630 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 [2019-11-24 04:55:09,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-24 04:55:09,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-11-24 04:55:09,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-24 04:55:09,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 60 transitions. [2019-11-24 04:55:09,879 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 60 transitions. Word has length 7 [2019-11-24 04:55:09,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:55:09,879 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 60 transitions. [2019-11-24 04:55:09,879 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-24 04:55:09,879 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 60 transitions. [2019-11-24 04:55:09,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-11-24 04:55:09,882 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:09,882 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:09,883 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:09,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:09,883 INFO L82 PathProgramCache]: Analyzing trace with hash -2107325855, now seen corresponding path program 1 times [2019-11-24 04:55:09,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:09,884 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454087228] [2019-11-24 04:55:09,884 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:09,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:10,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:10,054 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454087228] [2019-11-24 04:55:10,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:55:10,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 04:55:10,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374429054] [2019-11-24 04:55:10,058 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:55:10,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:55:10,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:55:10,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:55:10,059 INFO L87 Difference]: Start difference. First operand 37 states and 60 transitions. Second operand 3 states. [2019-11-24 04:55:10,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:55:10,084 INFO L93 Difference]: Finished difference Result 50 states and 74 transitions. [2019-11-24 04:55:10,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:55:10,087 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2019-11-24 04:55:10,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:55:10,088 INFO L225 Difference]: With dead ends: 50 [2019-11-24 04:55:10,088 INFO L226 Difference]: Without dead ends: 39 [2019-11-24 04:55:10,090 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 [2019-11-24 04:55:10,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-24 04:55:10,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-11-24 04:55:10,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-24 04:55:10,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 62 transitions. [2019-11-24 04:55:10,103 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 62 transitions. Word has length 8 [2019-11-24 04:55:10,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:55:10,104 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 62 transitions. [2019-11-24 04:55:10,104 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:55:10,104 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 62 transitions. [2019-11-24 04:55:10,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-24 04:55:10,105 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:10,106 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:10,106 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:10,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:10,107 INFO L82 PathProgramCache]: Analyzing trace with hash 1638123017, now seen corresponding path program 1 times [2019-11-24 04:55:10,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:10,108 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228119259] [2019-11-24 04:55:10,109 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:10,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:10,263 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:55:10,265 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228119259] [2019-11-24 04:55:10,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:55:10,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 04:55:10,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707625891] [2019-11-24 04:55:10,266 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:55:10,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:55:10,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:55:10,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:55:10,266 INFO L87 Difference]: Start difference. First operand 39 states and 62 transitions. Second operand 3 states. [2019-11-24 04:55:10,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:55:10,286 INFO L93 Difference]: Finished difference Result 45 states and 67 transitions. [2019-11-24 04:55:10,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:55:10,287 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-24 04:55:10,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:55:10,288 INFO L225 Difference]: With dead ends: 45 [2019-11-24 04:55:10,288 INFO L226 Difference]: Without dead ends: 36 [2019-11-24 04:55:10,288 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 [2019-11-24 04:55:10,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-24 04:55:10,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-24 04:55:10,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-24 04:55:10,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2019-11-24 04:55:10,295 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 12 [2019-11-24 04:55:10,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:55:10,296 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2019-11-24 04:55:10,296 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:55:10,296 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2019-11-24 04:55:10,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-24 04:55:10,297 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:10,297 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:10,297 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:10,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:10,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1264090361, now seen corresponding path program 1 times [2019-11-24 04:55:10,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:10,298 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456120613] [2019-11-24 04:55:10,298 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:10,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:10,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:55:10,563 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456120613] [2019-11-24 04:55:10,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:55:10,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-24 04:55:10,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409893322] [2019-11-24 04:55:10,565 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 04:55:10,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:55:10,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 04:55:10,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-24 04:55:10,566 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 6 states. [2019-11-24 04:55:10,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:55:10,878 INFO L93 Difference]: Finished difference Result 68 states and 112 transitions. [2019-11-24 04:55:10,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-24 04:55:10,879 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2019-11-24 04:55:10,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:55:10,880 INFO L225 Difference]: With dead ends: 68 [2019-11-24 04:55:10,880 INFO L226 Difference]: Without dead ends: 60 [2019-11-24 04:55:10,881 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-24 04:55:10,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-24 04:55:10,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2019-11-24 04:55:10,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-24 04:55:10,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 100 transitions. [2019-11-24 04:55:10,890 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 100 transitions. Word has length 15 [2019-11-24 04:55:10,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:55:10,890 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 100 transitions. [2019-11-24 04:55:10,890 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 04:55:10,891 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 100 transitions. [2019-11-24 04:55:10,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-24 04:55:10,892 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:10,892 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:10,892 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:10,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:10,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1687105229, now seen corresponding path program 1 times [2019-11-24 04:55:10,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:10,893 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649396959] [2019-11-24 04:55:10,893 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:10,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:11,029 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:11,030 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649396959] [2019-11-24 04:55:11,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:55:11,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 04:55:11,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781018411] [2019-11-24 04:55:11,031 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:55:11,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:55:11,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:55:11,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:55:11,031 INFO L87 Difference]: Start difference. First operand 58 states and 100 transitions. Second operand 3 states. [2019-11-24 04:55:11,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:55:11,057 INFO L93 Difference]: Finished difference Result 168 states and 292 transitions. [2019-11-24 04:55:11,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:55:11,058 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-11-24 04:55:11,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:55:11,059 INFO L225 Difference]: With dead ends: 168 [2019-11-24 04:55:11,060 INFO L226 Difference]: Without dead ends: 112 [2019-11-24 04:55:11,060 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 [2019-11-24 04:55:11,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2019-11-24 04:55:11,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 104. [2019-11-24 04:55:11,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-11-24 04:55:11,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 185 transitions. [2019-11-24 04:55:11,081 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 185 transitions. Word has length 20 [2019-11-24 04:55:11,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:55:11,081 INFO L462 AbstractCegarLoop]: Abstraction has 104 states and 185 transitions. [2019-11-24 04:55:11,081 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:55:11,081 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 185 transitions. [2019-11-24 04:55:11,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-24 04:55:11,083 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:11,083 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:11,084 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:11,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:11,084 INFO L82 PathProgramCache]: Analyzing trace with hash 773112974, now seen corresponding path program 1 times [2019-11-24 04:55:11,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:11,085 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048518354] [2019-11-24 04:55:11,085 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:11,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:11,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:11,166 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048518354] [2019-11-24 04:55:11,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:55:11,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 04:55:11,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073830624] [2019-11-24 04:55:11,167 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:55:11,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:55:11,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:55:11,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:55:11,168 INFO L87 Difference]: Start difference. First operand 104 states and 185 transitions. Second operand 3 states. [2019-11-24 04:55:11,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:55:11,191 INFO L93 Difference]: Finished difference Result 304 states and 543 transitions. [2019-11-24 04:55:11,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:55:11,192 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2019-11-24 04:55:11,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:55:11,193 INFO L225 Difference]: With dead ends: 304 [2019-11-24 04:55:11,193 INFO L226 Difference]: Without dead ends: 202 [2019-11-24 04:55:11,194 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 [2019-11-24 04:55:11,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2019-11-24 04:55:11,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 194. [2019-11-24 04:55:11,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2019-11-24 04:55:11,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 349 transitions. [2019-11-24 04:55:11,235 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 349 transitions. Word has length 21 [2019-11-24 04:55:11,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:55:11,236 INFO L462 AbstractCegarLoop]: Abstraction has 194 states and 349 transitions. [2019-11-24 04:55:11,236 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:55:11,236 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 349 transitions. [2019-11-24 04:55:11,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-24 04:55:11,241 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:11,241 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:11,241 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:11,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:11,241 INFO L82 PathProgramCache]: Analyzing trace with hash 837361633, now seen corresponding path program 1 times [2019-11-24 04:55:11,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:11,242 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373751456] [2019-11-24 04:55:11,242 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:11,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:11,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:11,324 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373751456] [2019-11-24 04:55:11,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:55:11,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 04:55:11,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144765923] [2019-11-24 04:55:11,325 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:55:11,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:55:11,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:55:11,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:55:11,326 INFO L87 Difference]: Start difference. First operand 194 states and 349 transitions. Second operand 3 states. [2019-11-24 04:55:11,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:55:11,355 INFO L93 Difference]: Finished difference Result 570 states and 1027 transitions. [2019-11-24 04:55:11,355 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:55:11,356 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2019-11-24 04:55:11,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:55:11,358 INFO L225 Difference]: With dead ends: 570 [2019-11-24 04:55:11,358 INFO L226 Difference]: Without dead ends: 378 [2019-11-24 04:55:11,362 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 [2019-11-24 04:55:11,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2019-11-24 04:55:11,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 370. [2019-11-24 04:55:11,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 370 states. [2019-11-24 04:55:11,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 665 transitions. [2019-11-24 04:55:11,398 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 665 transitions. Word has length 22 [2019-11-24 04:55:11,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:55:11,398 INFO L462 AbstractCegarLoop]: Abstraction has 370 states and 665 transitions. [2019-11-24 04:55:11,398 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:55:11,399 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 665 transitions. [2019-11-24 04:55:11,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-24 04:55:11,401 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:11,402 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:11,402 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:11,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:11,403 INFO L82 PathProgramCache]: Analyzing trace with hash -2070566704, now seen corresponding path program 1 times [2019-11-24 04:55:11,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:11,404 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063747810] [2019-11-24 04:55:11,404 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:11,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:11,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:11,483 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063747810] [2019-11-24 04:55:11,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:55:11,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 04:55:11,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297571110] [2019-11-24 04:55:11,484 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:55:11,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:55:11,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:55:11,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:55:11,484 INFO L87 Difference]: Start difference. First operand 370 states and 665 transitions. Second operand 3 states. [2019-11-24 04:55:11,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:55:11,536 INFO L93 Difference]: Finished difference Result 1090 states and 1959 transitions. [2019-11-24 04:55:11,537 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:55:11,537 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2019-11-24 04:55:11,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:55:11,541 INFO L225 Difference]: With dead ends: 1090 [2019-11-24 04:55:11,541 INFO L226 Difference]: Without dead ends: 722 [2019-11-24 04:55:11,542 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 [2019-11-24 04:55:11,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2019-11-24 04:55:11,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 714. [2019-11-24 04:55:11,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 714 states. [2019-11-24 04:55:11,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 714 states to 714 states and 1273 transitions. [2019-11-24 04:55:11,589 INFO L78 Accepts]: Start accepts. Automaton has 714 states and 1273 transitions. Word has length 23 [2019-11-24 04:55:11,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:55:11,589 INFO L462 AbstractCegarLoop]: Abstraction has 714 states and 1273 transitions. [2019-11-24 04:55:11,589 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:55:11,589 INFO L276 IsEmpty]: Start isEmpty. Operand 714 states and 1273 transitions. [2019-11-24 04:55:11,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-24 04:55:11,590 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:11,590 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:11,590 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:11,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:11,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1663427186, now seen corresponding path program 1 times [2019-11-24 04:55:11,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:11,591 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373146468] [2019-11-24 04:55:11,592 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:11,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:11,647 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:11,648 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373146468] [2019-11-24 04:55:11,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:55:11,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 04:55:11,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011621098] [2019-11-24 04:55:11,649 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:55:11,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:55:11,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:55:11,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:55:11,650 INFO L87 Difference]: Start difference. First operand 714 states and 1273 transitions. Second operand 3 states. [2019-11-24 04:55:11,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:55:11,748 INFO L93 Difference]: Finished difference Result 2106 states and 3751 transitions. [2019-11-24 04:55:11,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:55:11,748 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2019-11-24 04:55:11,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:55:11,756 INFO L225 Difference]: With dead ends: 2106 [2019-11-24 04:55:11,756 INFO L226 Difference]: Without dead ends: 1394 [2019-11-24 04:55:11,758 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 [2019-11-24 04:55:11,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1394 states. [2019-11-24 04:55:11,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1394 to 1386. [2019-11-24 04:55:11,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1386 states. [2019-11-24 04:55:11,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1386 states to 1386 states and 2441 transitions. [2019-11-24 04:55:11,848 INFO L78 Accepts]: Start accepts. Automaton has 1386 states and 2441 transitions. Word has length 24 [2019-11-24 04:55:11,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:55:11,849 INFO L462 AbstractCegarLoop]: Abstraction has 1386 states and 2441 transitions. [2019-11-24 04:55:11,849 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:55:11,849 INFO L276 IsEmpty]: Start isEmpty. Operand 1386 states and 2441 transitions. [2019-11-24 04:55:11,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-24 04:55:11,850 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:55:11,850 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:55:11,851 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:55:11,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:55:11,851 INFO L82 PathProgramCache]: Analyzing trace with hash -1029006719, now seen corresponding path program 1 times [2019-11-24 04:55:11,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:55:11,851 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801681991] [2019-11-24 04:55:11,852 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:55:12,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:12,256 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:12,257 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801681991] [2019-11-24 04:55:12,257 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816723069] [2019-11-24 04:55:12,257 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 [2019-11-24 04:55:12,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:55:12,756 INFO L255 TraceCheckSpWp]: Trace formula consists of 1023 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-24 04:55:12,765 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:55:12,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:12,808 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:55:12,838 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:55:12,838 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1841745572] [2019-11-24 04:55:12,887 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2019-11-24 04:55:12,888 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:55:12,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:55:12,911 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:55:12,911 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:56:01,168 WARN L192 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 689 [2019-11-24 04:56:05,126 WARN L192 SmtUtils]: Spent 1.35 s on a formula simplification. DAG size of input: 316 DAG size of output: 257 [2019-11-24 04:56:05,539 WARN L192 SmtUtils]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 731 [2019-11-24 04:56:08,071 WARN L192 SmtUtils]: Spent 1.97 s on a formula simplification that was a NOOP. DAG size: 1142