/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/list-simple/sll2n_remove_all_reverse.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 04:12:59,645 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 04:12:59,647 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 04:12:59,664 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 04:12:59,665 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 04:12:59,667 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 04:12:59,668 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 04:12:59,678 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 04:12:59,680 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 04:12:59,681 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 04:12:59,683 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 04:12:59,685 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 04:12:59,686 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 04:12:59,688 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 04:12:59,690 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 04:12:59,691 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 04:12:59,692 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 04:12:59,695 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 04:12:59,696 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 04:12:59,701 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 04:12:59,705 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 04:12:59,708 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 04:12:59,710 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 04:12:59,711 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 04:12:59,714 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 04:12:59,723 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 04:12:59,724 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 04:12:59,725 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 04:12:59,726 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 04:12:59,757 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 04:12:59,757 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 04:12:59,758 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 04:12:59,758 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 04:12:59,758 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 04:12:59,759 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 04:12:59,759 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 04:12:59,759 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 04:12:59,759 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 04:12:59,759 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 04:12:59,760 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 04:12:59,762 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 04:12:59,762 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 04:12:59,762 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 04:12:59,762 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 04:12:59,763 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 04:12:59,763 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 04:12:59,763 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 04:12:59,764 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 04:12:59,764 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 04:12:59,764 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 04:12:59,764 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 04:12:59,764 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 04:12:59,765 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 04:12:59,765 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 04:12:59,765 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 04:12:59,765 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 04:12:59,765 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 04:12:59,766 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 04:12:59,766 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 04:12:59,766 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 04:12:59,766 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 04:12:59,766 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 04:12:59,767 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 04:12:59,767 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 04:12:59,767 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 04:12:59,767 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 04:12:59,767 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 04:13:00,062 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 04:13:00,087 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 04:13:00,090 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 04:13:00,092 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 04:13:00,092 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 04:13:00,093 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-simple/sll2n_remove_all_reverse.i [2019-11-24 04:13:00,161 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b1c13577/8ac263b5d63248ceb741c32ff7c26df0/FLAG062a67063 [2019-11-24 04:13:00,747 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 04:13:00,748 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-simple/sll2n_remove_all_reverse.i [2019-11-24 04:13:00,764 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b1c13577/8ac263b5d63248ceb741c32ff7c26df0/FLAG062a67063 [2019-11-24 04:13:01,043 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b1c13577/8ac263b5d63248ceb741c32ff7c26df0 [2019-11-24 04:13:01,051 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 04:13:01,052 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 04:13:01,053 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 04:13:01,053 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 04:13:01,057 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 04:13:01,058 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,060 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73d9ee48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01, skipping insertion in model container [2019-11-24 04:13:01,061 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,068 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 04:13:01,109 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 04:13:01,585 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:13:01,595 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 04:13:01,648 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:13:01,702 INFO L208 MainTranslator]: Completed translation [2019-11-24 04:13:01,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01 WrapperNode [2019-11-24 04:13:01,703 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 04:13:01,704 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 04:13:01,704 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 04:13:01,704 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 04:13:01,713 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,742 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,767 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 04:13:01,768 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 04:13:01,768 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 04:13:01,768 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 04:13:01,775 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,776 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,779 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,780 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,789 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,794 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,796 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (1/1) ... [2019-11-24 04:13:01,800 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 04:13:01,800 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 04:13:01,800 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 04:13:01,800 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 04:13:01,801 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (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 04:13:01,870 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-24 04:13:01,871 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-24 04:13:01,871 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-24 04:13:01,871 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-11-24 04:13:01,871 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-11-24 04:13:01,871 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-24 04:13:01,871 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2019-11-24 04:13:01,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 04:13:01,872 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 04:13:02,343 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 04:13:02,344 INFO L284 CfgBuilder]: Removed 15 assume(true) statements. [2019-11-24 04:13:02,345 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:13:02 BoogieIcfgContainer [2019-11-24 04:13:02,345 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 04:13:02,347 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 04:13:02,347 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 04:13:02,350 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 04:13:02,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 04:13:01" (1/3) ... [2019-11-24 04:13:02,351 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a17c67e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:13:02, skipping insertion in model container [2019-11-24 04:13:02,351 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:13:01" (2/3) ... [2019-11-24 04:13:02,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a17c67e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:13:02, skipping insertion in model container [2019-11-24 04:13:02,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:13:02" (3/3) ... [2019-11-24 04:13:02,354 INFO L109 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2019-11-24 04:13:02,363 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 04:13:02,371 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 04:13:02,382 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 04:13:02,400 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 04:13:02,400 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 04:13:02,400 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 04:13:02,400 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 04:13:02,401 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 04:13:02,401 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 04:13:02,401 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 04:13:02,401 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 04:13:02,414 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2019-11-24 04:13:02,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-11-24 04:13:02,419 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:13:02,420 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2019-11-24 04:13:02,421 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:13:02,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:13:02,425 INFO L82 PathProgramCache]: Analyzing trace with hash 100476556, now seen corresponding path program 1 times [2019-11-24 04:13:02,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:13:02,433 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742836904] [2019-11-24 04:13:02,433 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:13:02,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:02,648 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 04:13:02,649 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742836904] [2019-11-24 04:13:02,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:13:02,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-24 04:13:02,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184905080] [2019-11-24 04:13:02,658 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 04:13:02,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:13:02,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 04:13:02,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-24 04:13:02,677 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 5 states. [2019-11-24 04:13:02,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:13:02,849 INFO L93 Difference]: Finished difference Result 38 states and 54 transitions. [2019-11-24 04:13:02,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 04:13:02,852 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2019-11-24 04:13:02,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:13:02,865 INFO L225 Difference]: With dead ends: 38 [2019-11-24 04:13:02,865 INFO L226 Difference]: Without dead ends: 14 [2019-11-24 04:13:02,873 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-24 04:13:02,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-24 04:13:02,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2019-11-24 04:13:02,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-24 04:13:02,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2019-11-24 04:13:02,914 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 5 [2019-11-24 04:13:02,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:13:02,914 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2019-11-24 04:13:02,915 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 04:13:02,915 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2019-11-24 04:13:02,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2019-11-24 04:13:02,915 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:13:02,916 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:13:02,916 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:13:02,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:13:02,917 INFO L82 PathProgramCache]: Analyzing trace with hash -51133806, now seen corresponding path program 1 times [2019-11-24 04:13:02,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:13:02,917 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315413371] [2019-11-24 04:13:02,918 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:13:02,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:03,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:13:03,058 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315413371] [2019-11-24 04:13:03,058 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363418002] [2019-11-24 04:13:03,059 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 04:13:03,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:03,145 INFO L255 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:13:03,150 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:13:03,176 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:13:03,177 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:13:03,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:13:03,202 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569245681] [2019-11-24 04:13:03,243 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2019-11-24 04:13:03,244 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:13:03,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:13:03,268 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:13:03,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:13:03,657 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:04,107 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:04,339 WARN L192 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 208 [2019-11-24 04:13:05,168 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:05,643 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:05,775 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:06,428 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:07,017 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:13:08,338 WARN L192 SmtUtils]: Spent 1.29 s on a formula simplification. DAG size of input: 138 DAG size of output: 107 [2019-11-24 04:13:08,998 WARN L192 SmtUtils]: Spent 624.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 95 [2019-11-24 04:13:09,732 WARN L192 SmtUtils]: Spent 693.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 109 [2019-11-24 04:13:09,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:13:09,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 7 [2019-11-24 04:13:09,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842371230] [2019-11-24 04:13:09,740 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 04:13:09,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:13:09,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 04:13:09,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-11-24 04:13:09,741 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand 5 states. [2019-11-24 04:13:09,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:13:09,902 INFO L93 Difference]: Finished difference Result 21 states and 26 transitions. [2019-11-24 04:13:09,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 04:13:09,903 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 7 [2019-11-24 04:13:09,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:13:09,905 INFO L225 Difference]: With dead ends: 21 [2019-11-24 04:13:09,905 INFO L226 Difference]: Without dead ends: 18 [2019-11-24 04:13:09,906 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-11-24 04:13:09,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-24 04:13:09,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 14. [2019-11-24 04:13:09,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-24 04:13:09,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2019-11-24 04:13:09,913 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2019-11-24 04:13:09,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:13:09,913 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2019-11-24 04:13:09,913 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 04:13:09,913 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2019-11-24 04:13:09,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-24 04:13:09,914 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:13:09,914 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:13:10,119 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:13:10,121 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:13:10,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:13:10,121 INFO L82 PathProgramCache]: Analyzing trace with hash 44976227, now seen corresponding path program 1 times [2019-11-24 04:13:10,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:13:10,122 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809840322] [2019-11-24 04:13:10,123 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:13:10,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:10,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:13:10,182 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809840322] [2019-11-24 04:13:10,182 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474220422] [2019-11-24 04:13:10,182 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 04:13:10,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:10,260 INFO L255 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:13:10,262 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:13:10,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:13:10,273 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:13:10,286 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:13:10,286 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1711336008] [2019-11-24 04:13:10,290 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-11-24 04:13:10,290 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:13:10,290 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:13:10,291 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:13:10,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:13:10,408 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:10,683 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:11,231 WARN L192 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 205 [2019-11-24 04:13:11,304 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:11,856 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:11,944 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:12,504 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:13,124 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:13,142 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:13,154 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:13,179 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:13:14,322 WARN L192 SmtUtils]: Spent 1.12 s on a formula simplification. DAG size of input: 138 DAG size of output: 107 [2019-11-24 04:13:14,925 WARN L192 SmtUtils]: Spent 574.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 88 [2019-11-24 04:13:15,662 WARN L192 SmtUtils]: Spent 700.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 109 [2019-11-24 04:13:16,504 WARN L192 SmtUtils]: Spent 796.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 134 [2019-11-24 04:13:16,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:13:16,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3, 3] total 8 [2019-11-24 04:13:16,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847183179] [2019-11-24 04:13:16,507 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 04:13:16,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:13:16,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 04:13:16,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-24 04:13:16,508 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand 6 states. [2019-11-24 04:13:16,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:13:16,654 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2019-11-24 04:13:16,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-24 04:13:16,655 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-11-24 04:13:16,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:13:16,656 INFO L225 Difference]: With dead ends: 27 [2019-11-24 04:13:16,656 INFO L226 Difference]: Without dead ends: 18 [2019-11-24 04:13:16,657 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-24 04:13:16,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-24 04:13:16,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 15. [2019-11-24 04:13:16,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-24 04:13:16,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2019-11-24 04:13:16,663 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 10 [2019-11-24 04:13:16,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:13:16,663 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2019-11-24 04:13:16,663 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 04:13:16,663 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2019-11-24 04:13:16,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-24 04:13:16,664 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:13:16,664 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:13:16,867 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:13:16,868 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:13:16,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:13:16,868 INFO L82 PathProgramCache]: Analyzing trace with hash 328249287, now seen corresponding path program 1 times [2019-11-24 04:13:16,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:13:16,869 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768961384] [2019-11-24 04:13:16,869 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:13:16,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:16,939 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:13:16,940 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768961384] [2019-11-24 04:13:16,940 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200790830] [2019-11-24 04:13:16,940 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 04:13:17,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:17,001 INFO L255 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:13:17,003 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:13:17,020 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:13:17,021 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:13:17,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:13:17,039 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2132013089] [2019-11-24 04:13:17,040 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-24 04:13:17,041 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:13:17,041 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:13:17,041 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:13:17,041 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:13:17,155 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:17,426 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:17,916 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:18,229 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:18,362 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:18,742 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:19,229 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:19,244 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:19,261 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:19,276 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:19,289 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:19,302 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:19,493 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:13:20,559 WARN L192 SmtUtils]: Spent 1.04 s on a formula simplification. DAG size of input: 138 DAG size of output: 107 [2019-11-24 04:13:21,152 WARN L192 SmtUtils]: Spent 566.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 95 [2019-11-24 04:13:21,814 WARN L192 SmtUtils]: Spent 625.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 109 [2019-11-24 04:13:22,653 WARN L192 SmtUtils]: Spent 790.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 134 [2019-11-24 04:13:23,484 WARN L192 SmtUtils]: Spent 777.00 ms on a formula simplification. DAG size of input: 184 DAG size of output: 129 [2019-11-24 04:13:24,368 WARN L192 SmtUtils]: Spent 814.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 138 [2019-11-24 04:13:24,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:13:24,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2019-11-24 04:13:24,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311037329] [2019-11-24 04:13:24,379 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-24 04:13:24,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:13:24,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-24 04:13:24,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-11-24 04:13:24,380 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 8 states. [2019-11-24 04:13:24,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:13:24,561 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2019-11-24 04:13:24,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-24 04:13:24,562 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2019-11-24 04:13:24,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:13:24,563 INFO L225 Difference]: With dead ends: 29 [2019-11-24 04:13:24,563 INFO L226 Difference]: Without dead ends: 20 [2019-11-24 04:13:24,563 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-11-24 04:13:24,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-24 04:13:24,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2019-11-24 04:13:24,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-24 04:13:24,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2019-11-24 04:13:24,568 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 13 [2019-11-24 04:13:24,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:13:24,569 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2019-11-24 04:13:24,569 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-24 04:13:24,569 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2019-11-24 04:13:24,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-24 04:13:24,570 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:13:24,570 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:13:24,773 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:13:24,773 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:13:24,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:13:24,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1425215650, now seen corresponding path program 1 times [2019-11-24 04:13:24,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:13:24,774 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016401839] [2019-11-24 04:13:24,774 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:13:24,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:24,804 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:13:24,804 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016401839] [2019-11-24 04:13:24,805 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913388951] [2019-11-24 04:13:24,805 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:13:24,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:24,860 INFO L255 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:13:24,861 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:13:24,866 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:13:24,866 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:13:24,877 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:13:24,877 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1445283622] [2019-11-24 04:13:24,879 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-24 04:13:24,879 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:13:24,879 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:13:24,880 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:13:24,880 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:13:24,967 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:25,185 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:25,582 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:25,891 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:26,003 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:26,149 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:26,918 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:26,947 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:26,969 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:26,995 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,016 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,138 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,164 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,191 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,212 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,232 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,255 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,280 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,303 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,321 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,343 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,359 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,375 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:27,665 WARN L192 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2019-11-24 04:13:28,376 WARN L192 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 184 DAG size of output: 180 [2019-11-24 04:13:30,079 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:13:31,628 WARN L192 SmtUtils]: Spent 1.49 s on a formula simplification. DAG size of input: 138 DAG size of output: 107 [2019-11-24 04:13:32,189 WARN L192 SmtUtils]: Spent 528.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 88 [2019-11-24 04:13:32,352 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 04:13:32,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:13:32,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2019-11-24 04:13:32,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593823749] [2019-11-24 04:13:32,354 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 04:13:32,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:13:32,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 04:13:32,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2019-11-24 04:13:32,354 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 5 states. [2019-11-24 04:13:32,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:13:32,392 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2019-11-24 04:13:32,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-24 04:13:32,393 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2019-11-24 04:13:32,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:13:32,394 INFO L225 Difference]: With dead ends: 32 [2019-11-24 04:13:32,394 INFO L226 Difference]: Without dead ends: 19 [2019-11-24 04:13:32,395 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2019-11-24 04:13:32,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-24 04:13:32,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-24 04:13:32,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-24 04:13:32,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2019-11-24 04:13:32,400 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2019-11-24 04:13:32,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:13:32,400 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2019-11-24 04:13:32,400 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 04:13:32,401 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2019-11-24 04:13:32,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-24 04:13:32,401 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:13:32,401 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:13:32,604 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:13:32,604 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:13:32,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:13:32,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1790106920, now seen corresponding path program 2 times [2019-11-24 04:13:32,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:13:32,605 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636290056] [2019-11-24 04:13:32,605 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:13:32,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:32,668 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:13:32,668 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636290056] [2019-11-24 04:13:32,668 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315315639] [2019-11-24 04:13:32,669 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:13:32,729 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-24 04:13:32,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-24 04:13:32,730 INFO L255 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-24 04:13:32,732 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:13:32,734 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-24 04:13:32,734 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:13:32,745 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-24 04:13:32,746 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [750112950] [2019-11-24 04:13:32,748 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-24 04:13:32,748 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:13:32,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:13:32,748 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:13:32,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:13:32,832 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:33,083 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:33,442 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:33,793 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:33,868 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:34,222 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:34,782 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:34,812 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:34,918 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:34,939 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:34,965 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:34,984 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,004 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,033 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,053 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,076 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,094 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,111 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,134 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,154 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,174 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,195 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,211 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:35,572 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2019-11-24 04:13:36,505 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:13:37,572 WARN L192 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 138 DAG size of output: 107 [2019-11-24 04:13:38,118 WARN L192 SmtUtils]: Spent 510.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 88 [2019-11-24 04:13:38,274 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 04:13:38,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:13:38,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2019-11-24 04:13:38,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406310280] [2019-11-24 04:13:38,275 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 04:13:38,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:13:38,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 04:13:38,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2019-11-24 04:13:38,276 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 6 states. [2019-11-24 04:13:38,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:13:38,346 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2019-11-24 04:13:38,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-24 04:13:38,348 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-11-24 04:13:38,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:13:38,349 INFO L225 Difference]: With dead ends: 27 [2019-11-24 04:13:38,349 INFO L226 Difference]: Without dead ends: 24 [2019-11-24 04:13:38,350 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2019-11-24 04:13:38,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-24 04:13:38,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-24 04:13:38,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-24 04:13:38,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2019-11-24 04:13:38,356 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 17 [2019-11-24 04:13:38,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:13:38,356 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2019-11-24 04:13:38,356 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 04:13:38,356 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2019-11-24 04:13:38,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-24 04:13:38,357 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:13:38,357 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:13:38,560 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:13:38,561 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:13:38,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:13:38,562 INFO L82 PathProgramCache]: Analyzing trace with hash 1420107277, now seen corresponding path program 1 times [2019-11-24 04:13:38,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:13:38,562 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080122771] [2019-11-24 04:13:38,562 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:13:38,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:38,645 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 04:13:38,646 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080122771] [2019-11-24 04:13:38,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:13:38,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-24 04:13:38,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682523257] [2019-11-24 04:13:38,646 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 04:13:38,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:13:38,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 04:13:38,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-24 04:13:38,648 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 5 states. [2019-11-24 04:13:38,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:13:38,745 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2019-11-24 04:13:38,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 04:13:38,745 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2019-11-24 04:13:38,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:13:38,746 INFO L225 Difference]: With dead ends: 33 [2019-11-24 04:13:38,746 INFO L226 Difference]: Without dead ends: 24 [2019-11-24 04:13:38,747 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-24 04:13:38,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-24 04:13:38,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-24 04:13:38,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-24 04:13:38,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2019-11-24 04:13:38,757 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 20 [2019-11-24 04:13:38,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:13:38,757 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2019-11-24 04:13:38,757 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 04:13:38,757 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2019-11-24 04:13:38,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-24 04:13:38,758 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:13:38,758 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2019-11-24 04:13:38,759 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:13:38,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:13:38,759 INFO L82 PathProgramCache]: Analyzing trace with hash 1459290589, now seen corresponding path program 3 times [2019-11-24 04:13:38,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:13:38,759 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752630336] [2019-11-24 04:13:38,759 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:13:38,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:39,151 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:13:39,152 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752630336] [2019-11-24 04:13:39,152 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779069047] [2019-11-24 04:13:39,152 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:13:39,305 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-24 04:13:39,306 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-24 04:13:39,310 INFO L255 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 108 conjunts are in the unsatisfiable core [2019-11-24 04:13:39,314 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:13:39,858 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:13:39,858 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:13:40,368 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-24 04:13:40,369 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1612675778] [2019-11-24 04:13:40,370 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-24 04:13:40,370 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:13:40,371 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:13:40,371 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:13:40,371 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:13:40,460 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:40,827 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:41,204 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:41,577 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:41,647 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,123 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,686 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,713 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,747 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,777 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,808 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,828 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,856 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,887 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:42,924 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:43,014 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:43,031 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:43,047 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:43,065 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:43,081 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:43,096 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:43,115 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:43,127 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:13:43,525 WARN L192 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 108 [2019-11-24 04:13:44,138 WARN L192 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 254 [2019-11-24 04:13:44,355 WARN L192 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 254 [2019-11-24 04:13:44,819 WARN L192 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 370 DAG size of output: 368 [2019-11-24 04:13:45,630 WARN L192 SmtUtils]: Spent 488.00 ms on a formula simplification. DAG size of input: 369 DAG size of output: 368 [2019-11-24 04:13:47,569 WARN L192 SmtUtils]: Spent 1.83 s on a formula simplification. DAG size of input: 654 DAG size of output: 654 [2019-11-24 04:13:49,953 WARN L192 SmtUtils]: Spent 1.84 s on a formula simplification. DAG size of input: 655 DAG size of output: 654 [2019-11-24 04:13:51,496 WARN L192 SmtUtils]: Spent 423.00 ms on a formula simplification. DAG size of input: 655 DAG size of output: 71 [2019-11-24 04:13:52,223 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:13:53,491 WARN L192 SmtUtils]: Spent 1.08 s on a formula simplification. DAG size of input: 138 DAG size of output: 107 [2019-11-24 04:13:54,167 WARN L192 SmtUtils]: Spent 534.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 96 [2019-11-24 04:13:54,470 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 04:13:54,471 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:13:54,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 11] total 31 [2019-11-24 04:13:54,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935259029] [2019-11-24 04:13:54,472 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-24 04:13:54,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:13:54,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-24 04:13:54,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1326, Unknown=0, NotChecked=0, Total=1482 [2019-11-24 04:13:54,473 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 31 states. [2019-11-24 04:13:55,363 WARN L192 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 63 [2019-11-24 04:13:55,672 WARN L192 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 53 [2019-11-24 04:13:56,164 WARN L192 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 67 [2019-11-24 04:13:56,392 WARN L192 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 52 [2019-11-24 04:13:56,585 WARN L192 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 60 [2019-11-24 04:13:56,946 WARN L192 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 71 [2019-11-24 04:13:57,151 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 47 [2019-11-24 04:13:57,424 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2019-11-24 04:13:57,586 WARN L192 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 47 [2019-11-24 04:13:58,141 WARN L192 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 54 [2019-11-24 04:13:58,356 WARN L192 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 58 [2019-11-24 04:13:58,506 WARN L192 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 51 [2019-11-24 04:13:58,673 WARN L192 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 49 [2019-11-24 04:13:58,844 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 53 [2019-11-24 04:13:58,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:13:58,976 INFO L93 Difference]: Finished difference Result 75 states and 89 transitions. [2019-11-24 04:13:58,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-24 04:13:58,977 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 23 [2019-11-24 04:13:58,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:13:58,978 INFO L225 Difference]: With dead ends: 75 [2019-11-24 04:13:58,978 INFO L226 Difference]: Without dead ends: 37 [2019-11-24 04:13:58,982 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 821 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=911, Invalid=3781, Unknown=0, NotChecked=0, Total=4692 [2019-11-24 04:13:58,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-24 04:13:58,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2019-11-24 04:13:58,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-24 04:13:58,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2019-11-24 04:13:58,990 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 23 [2019-11-24 04:13:58,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:13:58,990 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2019-11-24 04:13:58,991 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-24 04:13:58,991 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2019-11-24 04:13:58,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-24 04:13:58,991 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:13:58,991 INFO L410 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2019-11-24 04:13:59,195 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:13:59,195 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:13:59,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:13:59,196 INFO L82 PathProgramCache]: Analyzing trace with hash 1321268947, now seen corresponding path program 4 times [2019-11-24 04:13:59,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:13:59,197 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303856368] [2019-11-24 04:13:59,197 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:13:59,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:13:59,774 WARN L192 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 41 [2019-11-24 04:14:00,064 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-24 04:14:00,064 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303856368] [2019-11-24 04:14:00,064 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175679326] [2019-11-24 04:14:00,064 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:14:00,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:14:00,165 INFO L255 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 80 conjunts are in the unsatisfiable core [2019-11-24 04:14:00,168 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:14:01,280 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-24 04:14:01,280 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:14:03,099 WARN L192 SmtUtils]: Spent 669.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2019-11-24 04:14:03,511 WARN L192 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2019-11-24 04:14:03,792 WARN L192 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 98