/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/systemc/pc_sfifo_2.cil-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 06:05:01,540 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 06:05:01,542 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 06:05:01,555 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 06:05:01,555 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 06:05:01,556 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 06:05:01,557 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 06:05:01,559 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 06:05:01,561 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 06:05:01,562 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 06:05:01,563 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 06:05:01,564 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 06:05:01,564 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 06:05:01,565 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 06:05:01,566 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 06:05:01,567 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 06:05:01,567 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 06:05:01,568 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 06:05:01,570 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 06:05:01,572 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 06:05:01,574 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 06:05:01,575 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 06:05:01,576 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 06:05:01,577 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 06:05:01,579 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-24 06:05:01,579 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-24 06:05:01,579 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-24 06:05:01,580 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-24 06:05:01,581 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-24 06:05:01,582 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-24 06:05:01,582 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-24 06:05:01,584 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-24 06:05:01,586 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-24 06:05:01,586 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-24 06:05:01,587 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-24 06:05:01,587 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-24 06:05:01,588 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-24 06:05:01,588 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-24 06:05:01,588 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 06:05:01,592 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 06:05:01,593 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 06:05:01,594 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 06:05:01,616 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 06:05:01,616 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 06:05:01,617 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 06:05:01,617 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 06:05:01,618 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 06:05:01,618 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 06:05:01,618 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 06:05:01,618 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 06:05:01,618 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 06:05:01,618 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 06:05:01,619 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 06:05:01,619 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 06:05:01,619 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 06:05:01,619 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 06:05:01,620 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 06:05:01,620 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 06:05:01,620 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 06:05:01,621 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 06:05:01,621 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 06:05:01,621 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 06:05:01,621 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 06:05:01,621 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 06:05:01,622 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 06:05:01,622 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 06:05:01,622 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 06:05:01,622 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 06:05:01,622 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 06:05:01,623 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 06:05:01,623 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 06:05:01,623 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 06:05:01,623 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 06:05:01,623 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 06:05:01,624 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 06:05:01,624 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 06:05:01,624 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 06:05:01,624 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 06:05:01,624 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 06:05:01,625 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 06:05:01,911 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 06:05:01,926 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 06:05:01,930 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 06:05:01,931 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 06:05:01,932 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 06:05:01,932 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/systemc/pc_sfifo_2.cil-1.c [2019-11-24 06:05:01,989 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8411dd8cd/4545f738f80b42ff9bebdee9cc6f64e0/FLAGe894e7c29 [2019-11-24 06:05:02,437 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 06:05:02,438 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/systemc/pc_sfifo_2.cil-1.c [2019-11-24 06:05:02,446 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8411dd8cd/4545f738f80b42ff9bebdee9cc6f64e0/FLAGe894e7c29 [2019-11-24 06:05:02,814 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8411dd8cd/4545f738f80b42ff9bebdee9cc6f64e0 [2019-11-24 06:05:02,823 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 06:05:02,825 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 06:05:02,826 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 06:05:02,826 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 06:05:02,830 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 06:05:02,831 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:05:02" (1/1) ... [2019-11-24 06:05:02,834 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2db4663a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:02, skipping insertion in model container [2019-11-24 06:05:02,834 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:05:02" (1/1) ... [2019-11-24 06:05:02,840 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 06:05:02,880 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 06:05:03,089 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:05:03,098 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 06:05:03,144 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:05:03,244 INFO L208 MainTranslator]: Completed translation [2019-11-24 06:05:03,245 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03 WrapperNode [2019-11-24 06:05:03,245 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 06:05:03,249 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 06:05:03,249 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 06:05:03,249 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 06:05:03,258 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (1/1) ... [2019-11-24 06:05:03,265 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (1/1) ... [2019-11-24 06:05:03,295 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 06:05:03,296 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 06:05:03,296 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 06:05:03,296 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 06:05:03,304 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (1/1) ... [2019-11-24 06:05:03,304 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (1/1) ... [2019-11-24 06:05:03,307 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (1/1) ... [2019-11-24 06:05:03,307 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (1/1) ... [2019-11-24 06:05:03,313 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (1/1) ... [2019-11-24 06:05:03,320 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (1/1) ... [2019-11-24 06:05:03,323 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (1/1) ... [2019-11-24 06:05:03,326 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 06:05:03,327 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 06:05:03,327 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 06:05:03,327 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 06:05:03,328 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (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 06:05:03,390 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 06:05:03,390 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 06:05:04,290 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 06:05:04,291 INFO L284 CfgBuilder]: Removed 58 assume(true) statements. [2019-11-24 06:05:04,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:05:04 BoogieIcfgContainer [2019-11-24 06:05:04,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 06:05:04,294 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 06:05:04,294 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 06:05:04,297 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 06:05:04,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 06:05:02" (1/3) ... [2019-11-24 06:05:04,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f26b3a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:05:04, skipping insertion in model container [2019-11-24 06:05:04,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:05:03" (2/3) ... [2019-11-24 06:05:04,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f26b3a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:05:04, skipping insertion in model container [2019-11-24 06:05:04,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:05:04" (3/3) ... [2019-11-24 06:05:04,301 INFO L109 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1.c [2019-11-24 06:05:04,310 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 06:05:04,316 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2019-11-24 06:05:04,326 INFO L249 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2019-11-24 06:05:04,348 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 06:05:04,349 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 06:05:04,349 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 06:05:04,349 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 06:05:04,349 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 06:05:04,349 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 06:05:04,350 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 06:05:04,350 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 06:05:04,364 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2019-11-24 06:05:04,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-24 06:05:04,369 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:04,370 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:05:04,371 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:04,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:04,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1898821100, now seen corresponding path program 1 times [2019-11-24 06:05:04,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:04,385 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618515138] [2019-11-24 06:05:04,385 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:04,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:04,526 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 06:05:04,527 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618515138] [2019-11-24 06:05:04,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:05:04,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 06:05:04,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422045783] [2019-11-24 06:05:04,535 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:05:04,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:04,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:05:04,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:05:04,555 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 3 states. [2019-11-24 06:05:04,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:04,659 INFO L93 Difference]: Finished difference Result 119 states and 187 transitions. [2019-11-24 06:05:04,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:05:04,661 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-11-24 06:05:04,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:04,673 INFO L225 Difference]: With dead ends: 119 [2019-11-24 06:05:04,673 INFO L226 Difference]: Without dead ends: 73 [2019-11-24 06:05:04,677 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 06:05:04,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-11-24 06:05:04,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 66. [2019-11-24 06:05:04,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-24 06:05:04,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 96 transitions. [2019-11-24 06:05:04,729 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 96 transitions. Word has length 18 [2019-11-24 06:05:04,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:04,730 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 96 transitions. [2019-11-24 06:05:04,730 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:05:04,730 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 96 transitions. [2019-11-24 06:05:04,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-24 06:05:04,731 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:04,731 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:05:04,732 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:04,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:04,732 INFO L82 PathProgramCache]: Analyzing trace with hash -281150675, now seen corresponding path program 1 times [2019-11-24 06:05:04,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:04,733 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772088477] [2019-11-24 06:05:04,733 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:04,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:04,821 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 06:05:04,822 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772088477] [2019-11-24 06:05:04,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:05:04,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 06:05:04,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692480675] [2019-11-24 06:05:04,824 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:05:04,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:04,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:05:04,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:05:04,825 INFO L87 Difference]: Start difference. First operand 66 states and 96 transitions. Second operand 3 states. [2019-11-24 06:05:04,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:04,877 INFO L93 Difference]: Finished difference Result 180 states and 262 transitions. [2019-11-24 06:05:04,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:05:04,878 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-11-24 06:05:04,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:04,880 INFO L225 Difference]: With dead ends: 180 [2019-11-24 06:05:04,880 INFO L226 Difference]: Without dead ends: 119 [2019-11-24 06:05:04,881 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 06:05:04,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2019-11-24 06:05:04,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 105. [2019-11-24 06:05:04,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-11-24 06:05:04,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 149 transitions. [2019-11-24 06:05:04,897 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 149 transitions. Word has length 18 [2019-11-24 06:05:04,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:04,897 INFO L462 AbstractCegarLoop]: Abstraction has 105 states and 149 transitions. [2019-11-24 06:05:04,897 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:05:04,897 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 149 transitions. [2019-11-24 06:05:04,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-24 06:05:04,898 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:04,899 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 06:05:04,899 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:04,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:04,899 INFO L82 PathProgramCache]: Analyzing trace with hash -356690393, now seen corresponding path program 1 times [2019-11-24 06:05:04,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:04,900 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980877875] [2019-11-24 06:05:04,900 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:04,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:04,972 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 06:05:04,972 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980877875] [2019-11-24 06:05:04,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:05:04,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 06:05:04,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379293811] [2019-11-24 06:05:04,973 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:05:04,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:04,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:05:04,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:05:04,974 INFO L87 Difference]: Start difference. First operand 105 states and 149 transitions. Second operand 3 states. [2019-11-24 06:05:05,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:05,035 INFO L93 Difference]: Finished difference Result 215 states and 313 transitions. [2019-11-24 06:05:05,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:05:05,035 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-11-24 06:05:05,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:05,037 INFO L225 Difference]: With dead ends: 215 [2019-11-24 06:05:05,038 INFO L226 Difference]: Without dead ends: 135 [2019-11-24 06:05:05,042 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 06:05:05,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2019-11-24 06:05:05,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 132. [2019-11-24 06:05:05,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2019-11-24 06:05:05,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 188 transitions. [2019-11-24 06:05:05,061 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 188 transitions. Word has length 19 [2019-11-24 06:05:05,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:05,062 INFO L462 AbstractCegarLoop]: Abstraction has 132 states and 188 transitions. [2019-11-24 06:05:05,062 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:05:05,062 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 188 transitions. [2019-11-24 06:05:05,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-24 06:05:05,063 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:05,063 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:05:05,064 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:05,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:05,064 INFO L82 PathProgramCache]: Analyzing trace with hash -454140208, now seen corresponding path program 1 times [2019-11-24 06:05:05,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:05,065 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767450391] [2019-11-24 06:05:05,065 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:05,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:05,137 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:05:05,138 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767450391] [2019-11-24 06:05:05,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:05:05,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-24 06:05:05,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981815009] [2019-11-24 06:05:05,139 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-24 06:05:05,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:05,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-24 06:05:05,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-24 06:05:05,140 INFO L87 Difference]: Start difference. First operand 132 states and 188 transitions. Second operand 4 states. [2019-11-24 06:05:05,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:05,199 INFO L93 Difference]: Finished difference Result 395 states and 577 transitions. [2019-11-24 06:05:05,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-24 06:05:05,199 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 26 [2019-11-24 06:05:05,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:05,202 INFO L225 Difference]: With dead ends: 395 [2019-11-24 06:05:05,202 INFO L226 Difference]: Without dead ends: 270 [2019-11-24 06:05:05,203 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-24 06:05:05,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2019-11-24 06:05:05,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 177. [2019-11-24 06:05:05,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2019-11-24 06:05:05,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 258 transitions. [2019-11-24 06:05:05,222 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 258 transitions. Word has length 26 [2019-11-24 06:05:05,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:05,223 INFO L462 AbstractCegarLoop]: Abstraction has 177 states and 258 transitions. [2019-11-24 06:05:05,223 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-24 06:05:05,223 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 258 transitions. [2019-11-24 06:05:05,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-24 06:05:05,225 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:05,225 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] [2019-11-24 06:05:05,225 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:05,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:05,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1175961084, now seen corresponding path program 1 times [2019-11-24 06:05:05,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:05,226 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179878633] [2019-11-24 06:05:05,226 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:05,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:05,311 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 06:05:05,311 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179878633] [2019-11-24 06:05:05,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:05:05,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-24 06:05:05,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090461635] [2019-11-24 06:05:05,316 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-24 06:05:05,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:05,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-24 06:05:05,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-24 06:05:05,317 INFO L87 Difference]: Start difference. First operand 177 states and 258 transitions. Second operand 4 states. [2019-11-24 06:05:05,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:05,358 INFO L93 Difference]: Finished difference Result 216 states and 315 transitions. [2019-11-24 06:05:05,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-24 06:05:05,358 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 26 [2019-11-24 06:05:05,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:05,360 INFO L225 Difference]: With dead ends: 216 [2019-11-24 06:05:05,360 INFO L226 Difference]: Without dead ends: 214 [2019-11-24 06:05:05,361 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-24 06:05:05,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2019-11-24 06:05:05,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 175. [2019-11-24 06:05:05,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2019-11-24 06:05:05,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 255 transitions. [2019-11-24 06:05:05,386 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 255 transitions. Word has length 26 [2019-11-24 06:05:05,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:05,386 INFO L462 AbstractCegarLoop]: Abstraction has 175 states and 255 transitions. [2019-11-24 06:05:05,387 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-24 06:05:05,387 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 255 transitions. [2019-11-24 06:05:05,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-24 06:05:05,388 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:05,388 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] [2019-11-24 06:05:05,389 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:05,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:05,389 INFO L82 PathProgramCache]: Analyzing trace with hash -2095066805, now seen corresponding path program 1 times [2019-11-24 06:05:05,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:05,390 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740395225] [2019-11-24 06:05:05,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:05,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:05,501 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:05:05,502 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740395225] [2019-11-24 06:05:05,502 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187186554] [2019-11-24 06:05:05,502 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 06:05:05,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:05,591 INFO L255 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-24 06:05:05,595 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:05:05,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:05:05,657 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:05:05,673 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:05:05,674 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [315778342] [2019-11-24 06:05:05,709 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2019-11-24 06:05:05,710 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:05:05,740 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:05:05,753 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:05:05,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:05:05,999 WARN L192 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 100 [2019-11-24 06:05:06,178 WARN L192 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 138 [2019-11-24 06:05:06,413 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 06:05:06,794 WARN L192 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 46 [2019-11-24 06:05:06,983 WARN L192 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 48 [2019-11-24 06:05:07,169 WARN L192 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 52 [2019-11-24 06:05:07,366 WARN L192 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 52 [2019-11-24 06:05:07,616 WARN L192 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 58 [2019-11-24 06:05:07,903 WARN L192 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 64 [2019-11-24 06:05:08,147 WARN L192 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 66 [2019-11-24 06:05:08,871 WARN L192 SmtUtils]: Spent 672.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 91 [2019-11-24 06:05:09,521 WARN L192 SmtUtils]: Spent 409.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 74 [2019-11-24 06:05:10,006 WARN L192 SmtUtils]: Spent 426.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 78 [2019-11-24 06:05:10,475 WARN L192 SmtUtils]: Spent 377.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 77 [2019-11-24 06:05:11,140 WARN L192 SmtUtils]: Spent 385.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 83 [2019-11-24 06:05:11,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 06:05:11,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [3, 4, 3] total 20 [2019-11-24 06:05:11,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764425313] [2019-11-24 06:05:11,205 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-24 06:05:11,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:11,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-24 06:05:11,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2019-11-24 06:05:11,207 INFO L87 Difference]: Start difference. First operand 175 states and 255 transitions. Second operand 16 states. [2019-11-24 06:05:11,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:11,924 INFO L93 Difference]: Finished difference Result 313 states and 463 transitions. [2019-11-24 06:05:11,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-24 06:05:11,924 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 27 [2019-11-24 06:05:11,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:11,926 INFO L225 Difference]: With dead ends: 313 [2019-11-24 06:05:11,926 INFO L226 Difference]: Without dead ends: 145 [2019-11-24 06:05:11,928 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 52 SyntacticMatches, 12 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2019-11-24 06:05:11,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2019-11-24 06:05:11,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 139. [2019-11-24 06:05:11,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2019-11-24 06:05:11,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 197 transitions. [2019-11-24 06:05:11,963 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 197 transitions. Word has length 27 [2019-11-24 06:05:11,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:11,963 INFO L462 AbstractCegarLoop]: Abstraction has 139 states and 197 transitions. [2019-11-24 06:05:11,963 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-24 06:05:11,964 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 197 transitions. [2019-11-24 06:05:11,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-24 06:05:11,966 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:11,966 INFO L410 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1] [2019-11-24 06:05:12,171 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:05:12,171 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:12,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:12,172 INFO L82 PathProgramCache]: Analyzing trace with hash 2790896, now seen corresponding path program 1 times [2019-11-24 06:05:12,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:12,173 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044550503] [2019-11-24 06:05:12,173 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:12,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:12,216 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:05:12,217 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044550503] [2019-11-24 06:05:12,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:05:12,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:05:12,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083891125] [2019-11-24 06:05:12,218 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:05:12,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:12,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:05:12,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:05:12,218 INFO L87 Difference]: Start difference. First operand 139 states and 197 transitions. Second operand 3 states. [2019-11-24 06:05:12,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:12,238 INFO L93 Difference]: Finished difference Result 248 states and 359 transitions. [2019-11-24 06:05:12,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:05:12,238 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 39 [2019-11-24 06:05:12,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:12,239 INFO L225 Difference]: With dead ends: 248 [2019-11-24 06:05:12,239 INFO L226 Difference]: Without dead ends: 141 [2019-11-24 06:05:12,240 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 06:05:12,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2019-11-24 06:05:12,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 135. [2019-11-24 06:05:12,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-11-24 06:05:12,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 183 transitions. [2019-11-24 06:05:12,251 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 183 transitions. Word has length 39 [2019-11-24 06:05:12,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:12,251 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 183 transitions. [2019-11-24 06:05:12,251 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:05:12,251 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 183 transitions. [2019-11-24 06:05:12,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-24 06:05:12,253 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:12,253 INFO L410 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1] [2019-11-24 06:05:12,253 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:12,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:12,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1173813423, now seen corresponding path program 1 times [2019-11-24 06:05:12,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:12,254 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492144021] [2019-11-24 06:05:12,254 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:12,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:12,318 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:05:12,319 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492144021] [2019-11-24 06:05:12,319 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095414885] [2019-11-24 06:05:12,319 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 06:05:12,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:12,379 INFO L255 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-24 06:05:12,381 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:05:12,388 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:05:12,389 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:05:12,394 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:05:12,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-24 06:05:12,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 5 [2019-11-24 06:05:12,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954589922] [2019-11-24 06:05:12,396 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:05:12,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:12,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:05:12,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-24 06:05:12,397 INFO L87 Difference]: Start difference. First operand 135 states and 183 transitions. Second operand 3 states. [2019-11-24 06:05:12,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:12,429 INFO L93 Difference]: Finished difference Result 287 states and 397 transitions. [2019-11-24 06:05:12,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:05:12,430 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 39 [2019-11-24 06:05:12,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:12,431 INFO L225 Difference]: With dead ends: 287 [2019-11-24 06:05:12,431 INFO L226 Difference]: Without dead ends: 184 [2019-11-24 06:05:12,432 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-24 06:05:12,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2019-11-24 06:05:12,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 182. [2019-11-24 06:05:12,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2019-11-24 06:05:12,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 243 transitions. [2019-11-24 06:05:12,452 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 243 transitions. Word has length 39 [2019-11-24 06:05:12,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:12,452 INFO L462 AbstractCegarLoop]: Abstraction has 182 states and 243 transitions. [2019-11-24 06:05:12,452 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:05:12,452 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 243 transitions. [2019-11-24 06:05:12,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-24 06:05:12,454 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:12,454 INFO L410 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1] [2019-11-24 06:05:12,666 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:05:12,666 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:12,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:12,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1095468772, now seen corresponding path program 1 times [2019-11-24 06:05:12,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:12,668 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546946340] [2019-11-24 06:05:12,668 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:12,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:12,748 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:05:12,748 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546946340] [2019-11-24 06:05:12,749 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491728754] [2019-11-24 06:05:12,749 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 06:05:12,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:12,820 INFO L255 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-24 06:05:12,826 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:05:12,863 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:05:12,864 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:05:12,876 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:05:12,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-24 06:05:12,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 7 [2019-11-24 06:05:12,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875754434] [2019-11-24 06:05:12,877 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 06:05:12,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:12,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 06:05:12,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-24 06:05:12,885 INFO L87 Difference]: Start difference. First operand 182 states and 243 transitions. Second operand 5 states. [2019-11-24 06:05:12,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:12,943 INFO L93 Difference]: Finished difference Result 357 states and 482 transitions. [2019-11-24 06:05:12,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-24 06:05:12,944 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 40 [2019-11-24 06:05:12,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:12,945 INFO L225 Difference]: With dead ends: 357 [2019-11-24 06:05:12,945 INFO L226 Difference]: Without dead ends: 207 [2019-11-24 06:05:12,946 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-11-24 06:05:12,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2019-11-24 06:05:12,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 137. [2019-11-24 06:05:12,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2019-11-24 06:05:12,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 180 transitions. [2019-11-24 06:05:12,959 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 180 transitions. Word has length 40 [2019-11-24 06:05:12,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:12,959 INFO L462 AbstractCegarLoop]: Abstraction has 137 states and 180 transitions. [2019-11-24 06:05:12,959 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 06:05:12,960 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 180 transitions. [2019-11-24 06:05:12,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-24 06:05:12,963 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:12,963 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:05:13,167 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:05:13,167 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:13,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:13,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1536780824, now seen corresponding path program 1 times [2019-11-24 06:05:13,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:13,168 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526295514] [2019-11-24 06:05:13,168 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:13,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-24 06:05:13,277 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526295514] [2019-11-24 06:05:13,277 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602194771] [2019-11-24 06:05:13,277 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 06:05:13,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:13,348 INFO L255 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 06:05:13,353 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:05:13,364 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-11-24 06:05:13,365 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:05:13,377 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-11-24 06:05:13,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-24 06:05:13,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 5 [2019-11-24 06:05:13,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980449144] [2019-11-24 06:05:13,379 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-24 06:05:13,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:13,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-24 06:05:13,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-24 06:05:13,380 INFO L87 Difference]: Start difference. First operand 137 states and 180 transitions. Second operand 4 states. [2019-11-24 06:05:13,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:13,451 INFO L93 Difference]: Finished difference Result 360 states and 481 transitions. [2019-11-24 06:05:13,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 06:05:13,451 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 50 [2019-11-24 06:05:13,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:13,455 INFO L225 Difference]: With dead ends: 360 [2019-11-24 06:05:13,455 INFO L226 Difference]: Without dead ends: 264 [2019-11-24 06:05:13,456 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-24 06:05:13,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2019-11-24 06:05:13,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 163. [2019-11-24 06:05:13,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2019-11-24 06:05:13,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 214 transitions. [2019-11-24 06:05:13,470 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 214 transitions. Word has length 50 [2019-11-24 06:05:13,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:13,470 INFO L462 AbstractCegarLoop]: Abstraction has 163 states and 214 transitions. [2019-11-24 06:05:13,471 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-24 06:05:13,471 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 214 transitions. [2019-11-24 06:05:13,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-24 06:05:13,471 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:13,472 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:05:13,676 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:05:13,676 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:13,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:13,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1767021799, now seen corresponding path program 1 times [2019-11-24 06:05:13,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:13,677 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913829469] [2019-11-24 06:05:13,678 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:13,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:13,714 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-24 06:05:13,715 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913829469] [2019-11-24 06:05:13,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:05:13,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:05:13,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530092591] [2019-11-24 06:05:13,716 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:05:13,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:13,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:05:13,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:05:13,718 INFO L87 Difference]: Start difference. First operand 163 states and 214 transitions. Second operand 3 states. [2019-11-24 06:05:13,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:13,742 INFO L93 Difference]: Finished difference Result 286 states and 383 transitions. [2019-11-24 06:05:13,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:05:13,743 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 50 [2019-11-24 06:05:13,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:13,745 INFO L225 Difference]: With dead ends: 286 [2019-11-24 06:05:13,745 INFO L226 Difference]: Without dead ends: 164 [2019-11-24 06:05:13,747 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 06:05:13,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-11-24 06:05:13,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 113. [2019-11-24 06:05:13,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2019-11-24 06:05:13,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 137 transitions. [2019-11-24 06:05:13,771 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 137 transitions. Word has length 50 [2019-11-24 06:05:13,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:13,771 INFO L462 AbstractCegarLoop]: Abstraction has 113 states and 137 transitions. [2019-11-24 06:05:13,771 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:05:13,771 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 137 transitions. [2019-11-24 06:05:13,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-24 06:05:13,772 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:13,773 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:05:13,773 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:13,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:13,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1328574261, now seen corresponding path program 1 times [2019-11-24 06:05:13,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:13,775 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811269890] [2019-11-24 06:05:13,775 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:13,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:13,865 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 06:05:13,866 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811269890] [2019-11-24 06:05:13,866 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114907567] [2019-11-24 06:05:13,866 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 06:05:13,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:13,945 INFO L255 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-24 06:05:13,949 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:05:13,991 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 06:05:13,992 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:05:14,007 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 06:05:14,008 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1507874159] [2019-11-24 06:05:14,013 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2019-11-24 06:05:14,015 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:05:14,015 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:05:14,016 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:05:14,016 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:05:18,947 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 06:05:19,106 WARN L192 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 40 [2019-11-24 06:05:19,283 WARN L192 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 42 [2019-11-24 06:05:19,430 WARN L192 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 46 [2019-11-24 06:05:19,599 WARN L192 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 48 [2019-11-24 06:05:19,805 WARN L192 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 52 [2019-11-24 06:05:21,176 WARN L192 SmtUtils]: Spent 1.31 s on a formula simplification. DAG size of input: 164 DAG size of output: 106 [2019-11-24 06:05:22,401 WARN L192 SmtUtils]: Spent 1.14 s on a formula simplification. DAG size of input: 165 DAG size of output: 111 [2019-11-24 06:05:23,432 WARN L192 SmtUtils]: Spent 915.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 93 [2019-11-24 06:05:24,229 WARN L192 SmtUtils]: Spent 713.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 96 [2019-11-24 06:05:25,774 WARN L192 SmtUtils]: Spent 1.46 s on a formula simplification. DAG size of input: 168 DAG size of output: 126 [2019-11-24 06:05:26,765 WARN L192 SmtUtils]: Spent 895.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 93 [2019-11-24 06:05:27,924 WARN L192 SmtUtils]: Spent 1.07 s on a formula simplification. DAG size of input: 153 DAG size of output: 114 [2019-11-24 06:05:28,926 WARN L192 SmtUtils]: Spent 701.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 95 [2019-11-24 06:05:30,398 WARN L192 SmtUtils]: Spent 1.35 s on a formula simplification. DAG size of input: 159 DAG size of output: 118 [2019-11-24 06:05:31,500 WARN L192 SmtUtils]: Spent 608.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 82 [2019-11-24 06:05:32,369 WARN L192 SmtUtils]: Spent 675.00 ms on a formula simplification. DAG size of input: 220 DAG size of output: 73 [2019-11-24 06:05:32,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 06:05:32,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [3, 4, 3] total 22 [2019-11-24 06:05:32,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454475538] [2019-11-24 06:05:32,576 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-24 06:05:32,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:05:32,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-24 06:05:32,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2019-11-24 06:05:32,578 INFO L87 Difference]: Start difference. First operand 113 states and 137 transitions. Second operand 18 states. [2019-11-24 06:05:33,385 WARN L192 SmtUtils]: Spent 527.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 93 [2019-11-24 06:05:33,795 WARN L192 SmtUtils]: Spent 345.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 72 [2019-11-24 06:05:34,533 WARN L192 SmtUtils]: Spent 544.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 97 [2019-11-24 06:05:35,826 WARN L192 SmtUtils]: Spent 971.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 109 [2019-11-24 06:05:36,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:05:36,246 INFO L93 Difference]: Finished difference Result 208 states and 256 transitions. [2019-11-24 06:05:36,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-24 06:05:36,247 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2019-11-24 06:05:36,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:05:36,248 INFO L225 Difference]: With dead ends: 208 [2019-11-24 06:05:36,248 INFO L226 Difference]: Without dead ends: 128 [2019-11-24 06:05:36,249 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 124 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=117, Invalid=585, Unknown=0, NotChecked=0, Total=702 [2019-11-24 06:05:36,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2019-11-24 06:05:36,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 121. [2019-11-24 06:05:36,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-11-24 06:05:36,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 145 transitions. [2019-11-24 06:05:36,264 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 145 transitions. Word has length 51 [2019-11-24 06:05:36,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:05:36,266 INFO L462 AbstractCegarLoop]: Abstraction has 121 states and 145 transitions. [2019-11-24 06:05:36,266 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-24 06:05:36,266 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 145 transitions. [2019-11-24 06:05:36,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-24 06:05:36,267 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:05:36,267 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:05:36,478 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:05:36,479 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:05:36,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:05:36,480 INFO L82 PathProgramCache]: Analyzing trace with hash -570359403, now seen corresponding path program 1 times [2019-11-24 06:05:36,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:05:36,481 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609867611] [2019-11-24 06:05:36,481 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:05:36,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:36,539 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 06:05:36,539 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609867611] [2019-11-24 06:05:36,540 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320331076] [2019-11-24 06:05:36,540 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 06:05:36,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:05:36,601 INFO L255 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-24 06:05:36,603 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:05:36,655 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 06:05:36,656 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:05:36,666 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 06:05:36,667 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1776536313] [2019-11-24 06:05:36,669 INFO L159 IcfgInterpreter]: Started Sifa with 36 locations of interest [2019-11-24 06:05:36,670 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:05:36,670 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:05:36,670 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:05:36,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:05:43,420 WARN L192 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 228 [2019-11-24 06:05:44,198 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 06:05:44,563 WARN L192 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 46 [2019-11-24 06:05:44,747 WARN L192 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 48 [2019-11-24 06:05:45,472 WARN L192 SmtUtils]: Spent 681.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 101 [2019-11-24 06:05:47,726 WARN L192 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 217 DAG size of output: 119 [2019-11-24 06:05:49,336 WARN L192 SmtUtils]: Spent 1.51 s on a formula simplification. DAG size of input: 216 DAG size of output: 127 [2019-11-24 06:05:50,823 WARN L192 SmtUtils]: Spent 1.37 s on a formula simplification. DAG size of input: 218 DAG size of output: 114 [2019-11-24 06:05:51,650 WARN L192 SmtUtils]: Spent 721.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 96 [2019-11-24 06:05:53,376 WARN L192 SmtUtils]: Spent 1.62 s on a formula simplification. DAG size of input: 212 DAG size of output: 144 [2019-11-24 06:05:54,715 WARN L192 SmtUtils]: Spent 1.21 s on a formula simplification. DAG size of input: 211 DAG size of output: 111 [2019-11-24 06:05:56,280 WARN L192 SmtUtils]: Spent 1.45 s on a formula simplification. DAG size of input: 188 DAG size of output: 129 [2019-11-24 06:05:57,479 WARN L192 SmtUtils]: Spent 1.08 s on a formula simplification. DAG size of input: 188 DAG size of output: 110 [2019-11-24 06:05:58,397 WARN L192 SmtUtils]: Spent 782.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 95 [2019-11-24 06:05:59,918 WARN L192 SmtUtils]: Spent 1.38 s on a formula simplification. DAG size of input: 198 DAG size of output: 119 [2019-11-24 06:06:01,315 WARN L192 SmtUtils]: Spent 861.00 ms on a formula simplification. DAG size of input: 223 DAG size of output: 82 [2019-11-24 06:06:02,475 WARN L192 SmtUtils]: Spent 956.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 72 [2019-11-24 06:06:03,468 WARN L192 SmtUtils]: Spent 453.00 ms on a formula simplification. DAG size of input: 150 DAG size of output: 73 [2019-11-24 06:06:04,042 WARN L192 SmtUtils]: Spent 433.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 73 [2019-11-24 06:06:04,797 WARN L192 SmtUtils]: Spent 439.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 75 [2019-11-24 06:06:05,525 WARN L192 SmtUtils]: Spent 558.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 88 [2019-11-24 06:06:06,210 WARN L192 SmtUtils]: Spent 517.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 82 [2019-11-24 06:06:06,900 WARN L192 SmtUtils]: Spent 513.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 82 [2019-11-24 06:06:07,558 WARN L192 SmtUtils]: Spent 502.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 80 [2019-11-24 06:06:07,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 06:06:07,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [3, 4, 3] total 30 [2019-11-24 06:06:07,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074191505] [2019-11-24 06:06:07,715 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-24 06:06:07,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:06:07,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-24 06:06:07,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2019-11-24 06:06:07,717 INFO L87 Difference]: Start difference. First operand 121 states and 145 transitions. Second operand 26 states. [2019-11-24 06:06:08,053 WARN L192 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 53 [2019-11-24 06:06:08,708 WARN L192 SmtUtils]: Spent 488.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 83 [2019-11-24 06:06:09,130 WARN L192 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 67 [2019-11-24 06:06:09,788 WARN L192 SmtUtils]: Spent 450.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 94 [2019-11-24 06:06:11,293 WARN L192 SmtUtils]: Spent 1.14 s on a formula simplification. DAG size of input: 153 DAG size of output: 139 [2019-11-24 06:06:12,896 WARN L192 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 154 DAG size of output: 109 [2019-11-24 06:06:13,454 WARN L192 SmtUtils]: Spent 506.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 92 [2019-11-24 06:06:13,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:06:13,702 INFO L93 Difference]: Finished difference Result 240 states and 300 transitions. [2019-11-24 06:06:13,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-24 06:06:13,703 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 51 [2019-11-24 06:06:13,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:06:13,705 INFO L225 Difference]: With dead ends: 240 [2019-11-24 06:06:13,705 INFO L226 Difference]: Without dead ends: 152 [2019-11-24 06:06:13,706 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 115 SyntacticMatches, 11 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=174, Invalid=1232, Unknown=0, NotChecked=0, Total=1406 [2019-11-24 06:06:13,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2019-11-24 06:06:13,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 137. [2019-11-24 06:06:13,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2019-11-24 06:06:13,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 163 transitions. [2019-11-24 06:06:13,723 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 163 transitions. Word has length 51 [2019-11-24 06:06:13,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:06:13,723 INFO L462 AbstractCegarLoop]: Abstraction has 137 states and 163 transitions. [2019-11-24 06:06:13,723 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-24 06:06:13,723 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 163 transitions. [2019-11-24 06:06:13,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-24 06:06:13,724 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:06:13,724 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:06:13,927 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:06:13,928 INFO L410 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:06:13,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:06:13,928 INFO L82 PathProgramCache]: Analyzing trace with hash 2139029226, now seen corresponding path program 1 times [2019-11-24 06:06:13,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:06:13,929 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722409113] [2019-11-24 06:06:13,929 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:06:13,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:06:14,217 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 16 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:06:14,218 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722409113] [2019-11-24 06:06:14,218 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522629170] [2019-11-24 06:06:14,218 INFO L94 rtionOrderModulation]: Keeping assertion order 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 06:06:14,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:06:14,274 INFO L255 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-24 06:06:14,277 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:06:14,320 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:06:14,320 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:06:14,425 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:06:14,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-24 06:06:14,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 5] imperfect sequences [12] total 18 [2019-11-24 06:06:14,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631041073] [2019-11-24 06:06:14,426 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-24 06:06:14,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:06:14,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-24 06:06:14,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=231, Unknown=0, NotChecked=0, Total=342 [2019-11-24 06:06:14,427 INFO L87 Difference]: Start difference. First operand 137 states and 163 transitions. Second operand 9 states. [2019-11-24 06:06:14,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:06:14,552 INFO L93 Difference]: Finished difference Result 369 states and 453 transitions. [2019-11-24 06:06:14,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-24 06:06:14,552 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 51 [2019-11-24 06:06:14,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:06:14,554 INFO L225 Difference]: With dead ends: 369 [2019-11-24 06:06:14,554 INFO L226 Difference]: Without dead ends: 299 [2019-11-24 06:06:14,555 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2019-11-24 06:06:14,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2019-11-24 06:06:14,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 216. [2019-11-24 06:06:14,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2019-11-24 06:06:14,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 264 transitions. [2019-11-24 06:06:14,579 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 264 transitions. Word has length 51 [2019-11-24 06:06:14,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:06:14,579 INFO L462 AbstractCegarLoop]: Abstraction has 216 states and 264 transitions. [2019-11-24 06:06:14,579 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-24 06:06:14,579 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 264 transitions. [2019-11-24 06:06:14,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-24 06:06:14,580 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:06:14,580 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:06:14,783 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:06:14,783 INFO L410 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:06:14,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:06:14,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1618297602, now seen corresponding path program 1 times [2019-11-24 06:06:14,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:06:14,785 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629310816] [2019-11-24 06:06:14,786 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:06:14,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:06:14,879 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-24 06:06:14,881 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629310816] [2019-11-24 06:06:14,881 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18126526] [2019-11-24 06:06:14,882 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:06:14,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:06:14,972 INFO L255 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-24 06:06:14,978 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:06:15,096 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:06:15,097 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:06:15,201 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-24 06:06:15,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-24 06:06:15,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 7] total 14 [2019-11-24 06:06:15,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901867056] [2019-11-24 06:06:15,202 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 06:06:15,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:06:15,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 06:06:15,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2019-11-24 06:06:15,203 INFO L87 Difference]: Start difference. First operand 216 states and 264 transitions. Second operand 6 states. [2019-11-24 06:06:15,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:06:15,313 INFO L93 Difference]: Finished difference Result 453 states and 564 transitions. [2019-11-24 06:06:15,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-24 06:06:15,313 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2019-11-24 06:06:15,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:06:15,315 INFO L225 Difference]: With dead ends: 453 [2019-11-24 06:06:15,315 INFO L226 Difference]: Without dead ends: 307 [2019-11-24 06:06:15,318 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2019-11-24 06:06:15,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2019-11-24 06:06:15,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 206. [2019-11-24 06:06:15,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2019-11-24 06:06:15,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 248 transitions. [2019-11-24 06:06:15,344 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 248 transitions. Word has length 52 [2019-11-24 06:06:15,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:06:15,345 INFO L462 AbstractCegarLoop]: Abstraction has 206 states and 248 transitions. [2019-11-24 06:06:15,345 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 06:06:15,345 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 248 transitions. [2019-11-24 06:06:15,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-11-24 06:06:15,346 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:06:15,346 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:06:15,557 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:06:15,557 INFO L410 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:06:15,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:06:15,558 INFO L82 PathProgramCache]: Analyzing trace with hash 24598086, now seen corresponding path program 1 times [2019-11-24 06:06:15,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:06:15,559 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554114552] [2019-11-24 06:06:15,559 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:06:15,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:06:15,597 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-24 06:06:15,597 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554114552] [2019-11-24 06:06:15,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:06:15,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-24 06:06:15,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146641597] [2019-11-24 06:06:15,599 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 06:06:15,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:06:15,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 06:06:15,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-24 06:06:15,600 INFO L87 Difference]: Start difference. First operand 206 states and 248 transitions. Second operand 5 states. [2019-11-24 06:06:15,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:06:15,704 INFO L93 Difference]: Finished difference Result 370 states and 450 transitions. [2019-11-24 06:06:15,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-24 06:06:15,705 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 61 [2019-11-24 06:06:15,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:06:15,706 INFO L225 Difference]: With dead ends: 370 [2019-11-24 06:06:15,706 INFO L226 Difference]: Without dead ends: 236 [2019-11-24 06:06:15,707 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-24 06:06:15,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2019-11-24 06:06:15,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 217. [2019-11-24 06:06:15,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2019-11-24 06:06:15,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 258 transitions. [2019-11-24 06:06:15,747 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 258 transitions. Word has length 61 [2019-11-24 06:06:15,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:06:15,747 INFO L462 AbstractCegarLoop]: Abstraction has 217 states and 258 transitions. [2019-11-24 06:06:15,747 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 06:06:15,747 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 258 transitions. [2019-11-24 06:06:15,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-11-24 06:06:15,748 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:06:15,749 INFO L410 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1] [2019-11-24 06:06:15,749 INFO L410 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:06:15,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:06:15,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1067970812, now seen corresponding path program 1 times [2019-11-24 06:06:15,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:06:15,750 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411185723] [2019-11-24 06:06:15,750 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:06:15,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:06:15,838 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 29 proven. 19 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 06:06:15,839 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411185723] [2019-11-24 06:06:15,839 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172434641] [2019-11-24 06:06:15,839 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:06:15,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:06:15,947 INFO L255 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-24 06:06:15,956 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:06:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-24 06:06:16,042 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:06:16,077 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-24 06:06:16,078 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1972213653] [2019-11-24 06:06:16,084 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2019-11-24 06:06:16,084 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:06:16,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:06:16,086 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:06:16,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:06:23,528 WARN L192 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 183 [2019-11-24 06:06:23,901 WARN L192 SmtUtils]: Spent 371.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 183 [2019-11-24 06:06:24,053 WARN L192 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 165 [2019-11-24 06:06:24,315 WARN L192 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 157 [2019-11-24 06:06:24,425 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 157 [2019-11-24 06:06:24,629 WARN L192 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 229 DAG size of output: 184 [2019-11-24 06:06:25,142 WARN L192 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 189 [2019-11-24 06:06:25,435 WARN L192 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 189 [2019-11-24 06:06:25,587 WARN L192 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 169 [2019-11-24 06:06:26,971 WARN L192 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 235 DAG size of output: 179 [2019-11-24 06:06:27,077 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 235 DAG size of output: 179 [2019-11-24 06:06:27,478 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 244 DAG size of output: 178 [2019-11-24 06:06:27,581 WARN L192 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 244 DAG size of output: 178 [2019-11-24 06:06:27,897 WARN L192 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 253 DAG size of output: 183 [2019-11-24 06:06:28,028 WARN L192 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 253 DAG size of output: 183