/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/ssh-simplified/s3_clnt_2.cil-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 06:01:13,643 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 06:01:13,646 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 06:01:13,664 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 06:01:13,665 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 06:01:13,666 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 06:01:13,668 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 06:01:13,678 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 06:01:13,682 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 06:01:13,685 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 06:01:13,687 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 06:01:13,688 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 06:01:13,689 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 06:01:13,690 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 06:01:13,692 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 06:01:13,694 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 06:01:13,695 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 06:01:13,696 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 06:01:13,697 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 06:01:13,702 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 06:01:13,706 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 06:01:13,711 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 06:01:13,712 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 06:01:13,712 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 06:01:13,715 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-24 06:01:13,715 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-24 06:01:13,715 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-24 06:01:13,717 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-24 06:01:13,718 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-24 06:01:13,719 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-24 06:01:13,720 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-24 06:01:13,721 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-24 06:01:13,722 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-24 06:01:13,723 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-24 06:01:13,725 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-24 06:01:13,725 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-24 06:01:13,725 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-24 06:01:13,726 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-24 06:01:13,726 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 06:01:13,726 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 06:01:13,728 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 06:01:13,729 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 06:01:13,762 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 06:01:13,763 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 06:01:13,764 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 06:01:13,764 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 06:01:13,764 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 06:01:13,764 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 06:01:13,764 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 06:01:13,765 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 06:01:13,769 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 06:01:13,770 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 06:01:13,770 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 06:01:13,770 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 06:01:13,770 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 06:01:13,771 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 06:01:13,771 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 06:01:13,771 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 06:01:13,772 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 06:01:13,772 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 06:01:13,772 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 06:01:13,772 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 06:01:13,772 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 06:01:13,773 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 06:01:13,773 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 06:01:13,773 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 06:01:13,773 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 06:01:13,774 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 06:01:13,774 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 06:01:13,774 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 06:01:13,774 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 06:01:13,774 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 06:01:13,775 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 06:01:13,775 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 06:01:13,775 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 06:01:13,775 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 06:01:13,776 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 06:01:13,776 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 06:01:13,776 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 06:01:13,776 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 06:01:14,078 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 06:01:14,092 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 06:01:14,095 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 06:01:14,097 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 06:01:14,097 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 06:01:14,098 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ssh-simplified/s3_clnt_2.cil-2.c [2019-11-24 06:01:14,171 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a0f76e18/632bfbd4402c425084db11c3163f3436/FLAGe9b70c40f [2019-11-24 06:01:14,737 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 06:01:14,738 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ssh-simplified/s3_clnt_2.cil-2.c [2019-11-24 06:01:14,757 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a0f76e18/632bfbd4402c425084db11c3163f3436/FLAGe9b70c40f [2019-11-24 06:01:15,022 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a0f76e18/632bfbd4402c425084db11c3163f3436 [2019-11-24 06:01:15,032 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 06:01:15,034 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 06:01:15,035 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 06:01:15,035 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 06:01:15,038 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 06:01:15,039 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,041 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a614c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15, skipping insertion in model container [2019-11-24 06:01:15,041 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,047 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 06:01:15,104 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 06:01:15,365 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:01:15,369 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 06:01:15,511 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:01:15,526 INFO L208 MainTranslator]: Completed translation [2019-11-24 06:01:15,526 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15 WrapperNode [2019-11-24 06:01:15,526 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 06:01:15,527 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 06:01:15,527 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 06:01:15,527 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 06:01:15,536 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,546 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,589 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 06:01:15,589 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 06:01:15,589 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 06:01:15,590 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 06:01:15,598 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,598 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,601 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,602 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,609 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,617 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,620 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (1/1) ... [2019-11-24 06:01:15,626 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 06:01:15,627 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 06:01:15,627 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 06:01:15,627 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 06:01:15,628 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (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 06:01:15,711 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 06:01:15,712 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 06:01:15,837 WARN L735 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2019-11-24 06:01:16,497 INFO L688 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##85: assume !false; [2019-11-24 06:01:16,498 INFO L688 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##84: assume false; [2019-11-24 06:01:16,873 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 06:01:16,873 INFO L284 CfgBuilder]: Removed 7 assume(true) statements. [2019-11-24 06:01:16,874 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:01:16 BoogieIcfgContainer [2019-11-24 06:01:16,875 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 06:01:16,876 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 06:01:16,876 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 06:01:16,879 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 06:01:16,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 06:01:15" (1/3) ... [2019-11-24 06:01:16,880 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32381ad7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:01:16, skipping insertion in model container [2019-11-24 06:01:16,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:15" (2/3) ... [2019-11-24 06:01:16,881 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32381ad7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:01:16, skipping insertion in model container [2019-11-24 06:01:16,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:01:16" (3/3) ... [2019-11-24 06:01:16,882 INFO L109 eAbstractionObserver]: Analyzing ICFG s3_clnt_2.cil-2.c [2019-11-24 06:01:16,892 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 06:01:16,900 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 06:01:16,910 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 06:01:16,934 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 06:01:16,934 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 06:01:16,935 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 06:01:16,935 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 06:01:16,935 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 06:01:16,935 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 06:01:16,935 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 06:01:16,935 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 06:01:16,952 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states. [2019-11-24 06:01:16,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-24 06:01:16,958 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:01:16,959 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:01:16,960 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:01:16,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:01:16,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1021676193, now seen corresponding path program 1 times [2019-11-24 06:01:16,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:01:16,974 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118129058] [2019-11-24 06:01:16,975 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:01:17,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:01:17,181 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 06:01:17,183 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118129058] [2019-11-24 06:01:17,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:01:17,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 06:01:17,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579792619] [2019-11-24 06:01:17,193 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:01:17,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:01:17,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:01:17,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:01:17,208 INFO L87 Difference]: Start difference. First operand 85 states. Second operand 3 states. [2019-11-24 06:01:17,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:01:17,437 INFO L93 Difference]: Finished difference Result 171 states and 295 transitions. [2019-11-24 06:01:17,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:01:17,439 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-11-24 06:01:17,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:01:17,452 INFO L225 Difference]: With dead ends: 171 [2019-11-24 06:01:17,453 INFO L226 Difference]: Without dead ends: 84 [2019-11-24 06:01:17,457 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 06:01:17,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-24 06:01:17,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-11-24 06:01:17,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-24 06:01:17,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 121 transitions. [2019-11-24 06:01:17,503 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 121 transitions. Word has length 19 [2019-11-24 06:01:17,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:01:17,503 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 121 transitions. [2019-11-24 06:01:17,504 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:01:17,504 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 121 transitions. [2019-11-24 06:01:17,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-24 06:01:17,505 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:01:17,505 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, 1, 1, 1] [2019-11-24 06:01:17,506 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:01:17,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:01:17,506 INFO L82 PathProgramCache]: Analyzing trace with hash -399271212, now seen corresponding path program 1 times [2019-11-24 06:01:17,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:01:17,507 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289413898] [2019-11-24 06:01:17,507 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:01:17,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:01:17,573 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 06:01:17,574 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289413898] [2019-11-24 06:01:17,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:01:17,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:01:17,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906509364] [2019-11-24 06:01:17,578 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:01:17,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:01:17,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:01:17,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:01:17,580 INFO L87 Difference]: Start difference. First operand 84 states and 121 transitions. Second operand 3 states. [2019-11-24 06:01:17,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:01:17,766 INFO L93 Difference]: Finished difference Result 180 states and 263 transitions. [2019-11-24 06:01:17,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:01:17,766 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2019-11-24 06:01:17,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:01:17,768 INFO L225 Difference]: With dead ends: 180 [2019-11-24 06:01:17,768 INFO L226 Difference]: Without dead ends: 99 [2019-11-24 06:01:17,770 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 06:01:17,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-11-24 06:01:17,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2019-11-24 06:01:17,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-11-24 06:01:17,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 137 transitions. [2019-11-24 06:01:17,781 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 137 transitions. Word has length 28 [2019-11-24 06:01:17,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:01:17,781 INFO L462 AbstractCegarLoop]: Abstraction has 97 states and 137 transitions. [2019-11-24 06:01:17,781 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:01:17,781 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 137 transitions. [2019-11-24 06:01:17,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-24 06:01:17,783 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:01:17,783 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:01:17,783 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:01:17,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:01:17,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1642759980, now seen corresponding path program 1 times [2019-11-24 06:01:17,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:01:17,784 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364280972] [2019-11-24 06:01:17,785 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:01:17,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:01:17,876 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:01:17,877 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364280972] [2019-11-24 06:01:17,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:01:17,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:01:17,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166423920] [2019-11-24 06:01:17,879 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:01:17,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:01:17,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:01:17,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:01:17,880 INFO L87 Difference]: Start difference. First operand 97 states and 137 transitions. Second operand 3 states. [2019-11-24 06:01:18,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:01:18,042 INFO L93 Difference]: Finished difference Result 208 states and 299 transitions. [2019-11-24 06:01:18,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:01:18,043 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 39 [2019-11-24 06:01:18,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:01:18,045 INFO L225 Difference]: With dead ends: 208 [2019-11-24 06:01:18,045 INFO L226 Difference]: Without dead ends: 114 [2019-11-24 06:01:18,046 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 06:01:18,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-11-24 06:01:18,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2019-11-24 06:01:18,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-11-24 06:01:18,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 155 transitions. [2019-11-24 06:01:18,058 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 155 transitions. Word has length 39 [2019-11-24 06:01:18,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:01:18,060 INFO L462 AbstractCegarLoop]: Abstraction has 112 states and 155 transitions. [2019-11-24 06:01:18,060 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:01:18,061 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 155 transitions. [2019-11-24 06:01:18,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-24 06:01:18,063 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:01:18,064 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:01:18,064 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:01:18,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:01:18,065 INFO L82 PathProgramCache]: Analyzing trace with hash 468908958, now seen corresponding path program 1 times [2019-11-24 06:01:18,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:01:18,066 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562137213] [2019-11-24 06:01:18,067 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:01:18,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:01:18,220 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:01:18,221 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562137213] [2019-11-24 06:01:18,222 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612782316] [2019-11-24 06:01:18,222 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 06:01:18,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:01:18,330 INFO L255 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-24 06:01:18,336 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:01:18,430 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-24 06:01:18,431 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:01:18,466 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-24 06:01:18,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-24 06:01:18,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 9 [2019-11-24 06:01:18,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347899220] [2019-11-24 06:01:18,468 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 06:01:18,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:01:18,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 06:01:18,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-24 06:01:18,469 INFO L87 Difference]: Start difference. First operand 112 states and 155 transitions. Second operand 6 states. [2019-11-24 06:01:18,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:01:18,844 INFO L93 Difference]: Finished difference Result 315 states and 470 transitions. [2019-11-24 06:01:18,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 06:01:18,845 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2019-11-24 06:01:18,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:01:18,848 INFO L225 Difference]: With dead ends: 315 [2019-11-24 06:01:18,848 INFO L226 Difference]: Without dead ends: 205 [2019-11-24 06:01:18,851 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-24 06:01:18,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2019-11-24 06:01:18,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 187. [2019-11-24 06:01:18,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2019-11-24 06:01:18,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 256 transitions. [2019-11-24 06:01:18,882 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 256 transitions. Word has length 52 [2019-11-24 06:01:18,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:01:18,882 INFO L462 AbstractCegarLoop]: Abstraction has 187 states and 256 transitions. [2019-11-24 06:01:18,883 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 06:01:18,886 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 256 transitions. [2019-11-24 06:01:18,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-11-24 06:01:18,888 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:01:18,889 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:01:19,101 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:01:19,102 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:01:19,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:01:19,103 INFO L82 PathProgramCache]: Analyzing trace with hash -897590247, now seen corresponding path program 1 times [2019-11-24 06:01:19,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:01:19,104 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395388477] [2019-11-24 06:01:19,104 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:01:19,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:01:19,189 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-24 06:01:19,190 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395388477] [2019-11-24 06:01:19,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:01:19,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:01:19,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653707865] [2019-11-24 06:01:19,192 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:01:19,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:01:19,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:01:19,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:01:19,194 INFO L87 Difference]: Start difference. First operand 187 states and 256 transitions. Second operand 3 states. [2019-11-24 06:01:19,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:01:19,321 INFO L93 Difference]: Finished difference Result 392 states and 545 transitions. [2019-11-24 06:01:19,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:01:19,322 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 68 [2019-11-24 06:01:19,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:01:19,326 INFO L225 Difference]: With dead ends: 392 [2019-11-24 06:01:19,326 INFO L226 Difference]: Without dead ends: 208 [2019-11-24 06:01:19,329 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 06:01:19,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2019-11-24 06:01:19,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 206. [2019-11-24 06:01:19,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2019-11-24 06:01:19,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 278 transitions. [2019-11-24 06:01:19,353 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 278 transitions. Word has length 68 [2019-11-24 06:01:19,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:01:19,354 INFO L462 AbstractCegarLoop]: Abstraction has 206 states and 278 transitions. [2019-11-24 06:01:19,354 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:01:19,354 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 278 transitions. [2019-11-24 06:01:19,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-11-24 06:01:19,360 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:01:19,361 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:01:19,361 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:01:19,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:01:19,361 INFO L82 PathProgramCache]: Analyzing trace with hash 1429698848, now seen corresponding path program 1 times [2019-11-24 06:01:19,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:01:19,362 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070071349] [2019-11-24 06:01:19,362 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:01:19,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:01:19,501 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-24 06:01:19,501 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070071349] [2019-11-24 06:01:19,502 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557731754] [2019-11-24 06:01:19,503 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:01:19,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:01:19,593 INFO L255 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-24 06:01:19,604 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:01:19,633 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2019-11-24 06:01:19,633 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:01:19,692 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2019-11-24 06:01:19,693 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1375991636] [2019-11-24 06:01:19,729 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2019-11-24 06:01:19,730 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:01:19,736 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:01:19,743 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:01:19,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:01:20,076 WARN L192 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 201 [2019-11-24 06:01:20,177 WARN L192 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 201 [2019-11-24 06:01:20,397 WARN L192 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2019-11-24 06:01:20,641 WARN L192 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 235 DAG size of output: 235 [2019-11-24 06:01:21,015 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2019-11-24 06:01:21,125 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2019-11-24 06:01:21,243 WARN L192 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2019-11-24 06:01:21,419 WARN L192 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 244 DAG size of output: 244 [2019-11-24 06:01:21,568 WARN L192 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 244 DAG size of output: 244 [2019-11-24 06:01:21,769 WARN L192 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 244 [2019-11-24 06:01:22,065 WARN L192 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 255 [2019-11-24 06:01:22,406 WARN L192 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 256 DAG size of output: 256 [2019-11-24 06:01:22,573 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 260 [2019-11-24 06:01:22,773 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 257 [2019-11-24 06:01:22,916 WARN L192 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 260 [2019-11-24 06:01:23,044 WARN L192 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 260 [2019-11-24 06:01:23,201 WARN L192 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 260 [2019-11-24 06:01:23,307 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 260 [2019-11-24 06:01:24,257 WARN L192 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 272 [2019-11-24 06:01:24,433 WARN L192 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 287 [2019-11-24 06:01:25,201 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 277 [2019-11-24 06:01:25,305 WARN L192 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2019-11-24 06:01:26,246 WARN L192 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 269 [2019-11-24 06:01:26,353 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 269 [2019-11-24 06:01:26,747 WARN L192 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 269 [2019-11-24 06:01:26,871 WARN L192 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 315 [2019-11-24 06:01:26,981 WARN L192 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 315 [2019-11-24 06:01:27,093 WARN L192 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 315 [2019-11-24 06:01:27,208 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 315 [2019-11-24 06:01:27,332 WARN L192 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 315 [2019-11-24 06:01:27,443 WARN L192 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 315 [2019-11-24 06:01:27,611 WARN L192 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 321 DAG size of output: 321 [2019-11-24 06:01:27,767 WARN L192 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 321 DAG size of output: 321 [2019-11-24 06:01:27,889 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 321 [2019-11-24 06:01:28,131 WARN L192 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 276 DAG size of output: 276 [2019-11-24 06:01:28,397 WARN L192 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 276 DAG size of output: 276 [2019-11-24 06:01:28,612 WARN L192 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 276 [2019-11-24 06:01:28,725 WARN L192 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 276 DAG size of output: 276 [2019-11-24 06:01:29,124 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 276 DAG size of output: 276 [2019-11-24 06:01:29,227 WARN L192 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 276 [2019-11-24 06:01:29,723 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 06:01:34,148 WARN L192 SmtUtils]: Spent 4.32 s on a formula simplification. DAG size of input: 319 DAG size of output: 231 [2019-11-24 06:01:38,482 WARN L192 SmtUtils]: Spent 4.26 s on a formula simplification. DAG size of input: 274 DAG size of output: 241 [2019-11-24 06:01:39,163 WARN L192 SmtUtils]: Spent 630.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 150 [2019-11-24 06:01:39,905 WARN L192 SmtUtils]: Spent 679.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 156 [2019-11-24 06:01:40,677 WARN L192 SmtUtils]: Spent 674.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 157 [2019-11-24 06:01:41,519 WARN L192 SmtUtils]: Spent 703.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 159 [2019-11-24 06:01:45,548 WARN L192 SmtUtils]: Spent 3.91 s on a formula simplification. DAG size of input: 313 DAG size of output: 230 [2019-11-24 06:01:49,559 WARN L192 SmtUtils]: Spent 3.86 s on a formula simplification. DAG size of input: 314 DAG size of output: 231 [2019-11-24 06:01:53,320 WARN L192 SmtUtils]: Spent 3.62 s on a formula simplification. DAG size of input: 277 DAG size of output: 227 [2019-11-24 06:01:55,499 WARN L192 SmtUtils]: Spent 1.38 s on a formula simplification. DAG size of input: 288 DAG size of output: 178 [2019-11-24 06:01:56,966 WARN L192 SmtUtils]: Spent 1.32 s on a formula simplification. DAG size of input: 277 DAG size of output: 179 [2019-11-24 06:02:01,267 WARN L192 SmtUtils]: Spent 3.47 s on a formula simplification. DAG size of input: 289 DAG size of output: 218 [2019-11-24 06:02:03,061 WARN L192 SmtUtils]: Spent 1.43 s on a formula simplification. DAG size of input: 292 DAG size of output: 178 [2019-11-24 06:02:04,685 WARN L192 SmtUtils]: Spent 1.45 s on a formula simplification. DAG size of input: 283 DAG size of output: 180 [2019-11-24 06:02:10,245 WARN L192 SmtUtils]: Spent 4.48 s on a formula simplification. DAG size of input: 293 DAG size of output: 213 [2019-11-24 06:02:11,752 WARN L192 SmtUtils]: Spent 1.10 s on a formula simplification. DAG size of input: 255 DAG size of output: 171 [2019-11-24 06:02:13,054 WARN L192 SmtUtils]: Spent 1.12 s on a formula simplification. DAG size of input: 257 DAG size of output: 173 [2019-11-24 06:02:14,365 WARN L192 SmtUtils]: Spent 1.14 s on a formula simplification. DAG size of input: 263 DAG size of output: 179 [2019-11-24 06:02:20,097 WARN L192 SmtUtils]: Spent 4.45 s on a formula simplification. DAG size of input: 297 DAG size of output: 209 [2019-11-24 06:02:22,048 WARN L192 SmtUtils]: Spent 1.41 s on a formula simplification. DAG size of input: 300 DAG size of output: 184 [2019-11-24 06:02:23,787 WARN L192 SmtUtils]: Spent 1.50 s on a formula simplification. DAG size of input: 298 DAG size of output: 187 [2019-11-24 06:02:25,248 WARN L192 SmtUtils]: Spent 1.25 s on a formula simplification. DAG size of input: 241 DAG size of output: 181 [2019-11-24 06:02:30,430 WARN L192 SmtUtils]: Spent 3.53 s on a formula simplification. DAG size of input: 301 DAG size of output: 205 [2019-11-24 06:02:32,561 WARN L192 SmtUtils]: Spent 1.47 s on a formula simplification. DAG size of input: 304 DAG size of output: 186 [2019-11-24 06:02:34,348 WARN L192 SmtUtils]: Spent 1.51 s on a formula simplification. DAG size of input: 299 DAG size of output: 189 [2019-11-24 06:02:34,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 06:02:34,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [5, 4, 3] total 33 [2019-11-24 06:02:34,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419965848] [2019-11-24 06:02:34,352 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-24 06:02:34,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:34,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-24 06:02:34,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=872, Unknown=0, NotChecked=0, Total=1122 [2019-11-24 06:02:34,354 INFO L87 Difference]: Start difference. First operand 206 states and 278 transitions. Second operand 27 states. [2019-11-24 06:02:37,896 WARN L192 SmtUtils]: Spent 2.45 s on a formula simplification. DAG size of input: 260 DAG size of output: 225 [2019-11-24 06:02:41,827 WARN L192 SmtUtils]: Spent 1.60 s on a formula simplification. DAG size of input: 265 DAG size of output: 184 [2019-11-24 06:02:44,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:44,304 INFO L93 Difference]: Finished difference Result 517 states and 686 transitions. [2019-11-24 06:02:44,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-24 06:02:44,305 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 86 [2019-11-24 06:02:44,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:44,308 INFO L225 Difference]: With dead ends: 517 [2019-11-24 06:02:44,308 INFO L226 Difference]: Without dead ends: 314 [2019-11-24 06:02:44,310 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 196 SyntacticMatches, 33 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1018 ImplicationChecksByTransitivity, 68.8s TimeCoverageRelationStatistics Valid=271, Invalid=989, Unknown=0, NotChecked=0, Total=1260 [2019-11-24 06:02:44,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2019-11-24 06:02:44,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 289. [2019-11-24 06:02:44,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2019-11-24 06:02:44,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 365 transitions. [2019-11-24 06:02:44,330 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 365 transitions. Word has length 86 [2019-11-24 06:02:44,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:44,330 INFO L462 AbstractCegarLoop]: Abstraction has 289 states and 365 transitions. [2019-11-24 06:02:44,331 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-24 06:02:44,331 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 365 transitions. [2019-11-24 06:02:44,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-11-24 06:02:44,332 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:44,333 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:44,538 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:02:44,538 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:44,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:44,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1930219691, now seen corresponding path program 1 times [2019-11-24 06:02:44,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:44,539 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128348806] [2019-11-24 06:02:44,539 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:44,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:44,632 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 118 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:02:44,632 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128348806] [2019-11-24 06:02:44,633 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701272041] [2019-11-24 06:02:44,633 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:02:44,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:44,706 INFO L255 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-24 06:02:44,709 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:02:44,748 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 118 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:02:44,748 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:02:44,810 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2019-11-24 06:02:44,811 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1558400917] [2019-11-24 06:02:44,813 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2019-11-24 06:02:44,813 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:02:44,814 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:02:44,814 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:02:44,814 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:02:45,553 WARN L192 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 246 [2019-11-24 06:02:45,703 WARN L192 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 246 [2019-11-24 06:02:45,816 WARN L192 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 245 [2019-11-24 06:02:46,312 WARN L192 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 272 [2019-11-24 06:02:46,489 WARN L192 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 259 DAG size of output: 251 [2019-11-24 06:02:46,649 WARN L192 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 259 DAG size of output: 251 [2019-11-24 06:02:46,814 WARN L192 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 250 [2019-11-24 06:02:47,102 WARN L192 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 261 [2019-11-24 06:02:47,292 WARN L192 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 261 [2019-11-24 06:02:47,427 WARN L192 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 261 [2019-11-24 06:02:47,543 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 261 [2019-11-24 06:02:47,652 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 261 [2019-11-24 06:02:47,763 WARN L192 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 261