/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/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:19:00,209 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:19:00,212 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:19:00,254 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:19:00,254 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:19:00,263 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:19:00,266 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:19:00,269 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:19:00,272 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:19:00,275 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:19:00,276 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:19:00,277 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:19:00,277 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:19:00,280 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:19:00,282 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:19:00,284 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:19:00,285 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:19:00,286 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:19:00,287 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:19:00,296 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:19:00,298 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:19:00,299 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:19:00,300 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:19:00,301 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:19:00,313 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 18:19:00,313 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 18:19:00,313 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 18:19:00,320 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 18:19:00,320 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 18:19:00,324 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 18:19:00,324 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 18:19:00,325 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 18:19:00,326 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 18:19:00,326 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 18:19:00,330 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 18:19:00,330 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 18:19:00,331 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 18:19:00,331 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 18:19:00,331 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:19:00,333 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:19:00,333 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:19:00,334 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 18:19:00,367 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:19:00,368 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:19:00,369 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:19:00,369 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:19:00,369 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:19:00,370 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:19:00,370 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:19:00,370 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:19:00,370 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:19:00,370 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:19:00,371 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:19:00,371 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:19:00,371 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:19:00,371 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:19:00,371 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:19:00,372 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:19:00,372 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:19:00,372 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:19:00,372 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:19:00,372 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:19:00,373 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:19:00,373 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:19:00,373 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:19:00,373 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:19:00,373 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:19:00,374 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:19:00,374 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:19:00,374 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:19:00,374 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:19:00,374 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:19:00,705 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:19:00,717 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:19:00,721 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:19:00,723 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:19:00,723 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:19:00,724 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-21 18:19:00,786 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e7335fd75/3468406806cd4c13bd5834a1083ff973/FLAG58b8ccdd4 [2020-08-21 18:19:01,415 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:19:01,416 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-21 18:19:01,435 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e7335fd75/3468406806cd4c13bd5834a1083ff973/FLAG58b8ccdd4 [2020-08-21 18:19:01,554 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e7335fd75/3468406806cd4c13bd5834a1083ff973 [2020-08-21 18:19:01,564 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:19:01,566 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:19:01,567 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:19:01,567 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:19:01,571 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:19:01,572 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:19:01" (1/1) ... [2020-08-21 18:19:01,575 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54e86706 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:01, skipping insertion in model container [2020-08-21 18:19:01,575 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:19:01" (1/1) ... [2020-08-21 18:19:01,583 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:19:01,705 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:19:02,823 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:19:02,836 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:19:03,271 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:19:03,300 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:19:03,300 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03 WrapperNode [2020-08-21 18:19:03,301 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:19:03,301 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:19:03,302 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:19:03,302 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:19:03,325 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03" (1/1) ... [2020-08-21 18:19:03,325 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03" (1/1) ... [2020-08-21 18:19:03,349 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03" (1/1) ... [2020-08-21 18:19:03,350 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03" (1/1) ... [2020-08-21 18:19:03,406 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03" (1/1) ... [2020-08-21 18:19:03,448 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03" (1/1) ... [2020-08-21 18:19:03,461 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03" (1/1) ... [2020-08-21 18:19:03,485 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:19:03,488 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:19:03,488 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:19:03,489 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:19:03,490 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 18:19:03,591 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:19:03,591 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:19:03,592 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 18:19:03,592 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:19:03,593 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:19:03,593 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 18:19:03,593 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-21 18:19:03,594 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 18:19:03,594 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-21 18:19:03,595 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 18:19:03,595 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 18:19:03,596 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-21 18:19:03,596 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-21 18:19:03,596 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-21 18:19:03,597 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-21 18:19:03,598 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-21 18:19:03,598 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-21 18:19:03,599 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 18:19:03,599 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 18:19:03,599 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:19:03,600 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:19:03,600 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:19:06,597 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:19:06,598 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 18:19:06,608 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:19:06 BoogieIcfgContainer [2020-08-21 18:19:06,609 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:19:06,610 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:19:06,610 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:19:06,613 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:19:06,614 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:19:01" (1/3) ... [2020-08-21 18:19:06,615 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2458cb43 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:19:06, skipping insertion in model container [2020-08-21 18:19:06,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:03" (2/3) ... [2020-08-21 18:19:06,615 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2458cb43 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:19:06, skipping insertion in model container [2020-08-21 18:19:06,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:19:06" (3/3) ... [2020-08-21 18:19:06,617 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-21 18:19:06,628 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:19:06,637 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:19:06,652 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:19:06,685 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:19:06,685 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:19:06,685 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:19:06,685 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:19:06,686 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:19:06,686 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:19:06,686 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:19:06,686 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:19:06,723 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states. [2020-08-21 18:19:06,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-08-21 18:19:06,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:19:06,752 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:19:06,753 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:19:06,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:19:06,759 INFO L82 PathProgramCache]: Analyzing trace with hash 578636414, now seen corresponding path program 1 times [2020-08-21 18:19:06,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:19:06,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [893207504] [2020-08-21 18:19:06,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:19:07,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:08,564 WARN L193 SmtUtils]: Spent 640.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-21 18:19:08,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:19:08,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:08,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:19:08,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [893207504] [2020-08-21 18:19:08,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:19:08,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:19:08,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428538846] [2020-08-21 18:19:08,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:19:08,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:19:08,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:19:08,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:19:08,818 INFO L87 Difference]: Start difference. First operand 796 states. Second operand 4 states. [2020-08-21 18:19:09,513 WARN L193 SmtUtils]: Spent 602.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-21 18:19:15,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:19:15,180 INFO L93 Difference]: Finished difference Result 1515 states and 2659 transitions. [2020-08-21 18:19:15,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:19:15,183 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-08-21 18:19:15,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:19:15,211 INFO L225 Difference]: With dead ends: 1515 [2020-08-21 18:19:15,211 INFO L226 Difference]: Without dead ends: 1299 [2020-08-21 18:19:15,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:19:15,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1299 states. [2020-08-21 18:19:15,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1299 to 1297. [2020-08-21 18:19:15,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1297 states. [2020-08-21 18:19:15,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1297 states to 1297 states and 2028 transitions. [2020-08-21 18:19:15,362 INFO L78 Accepts]: Start accepts. Automaton has 1297 states and 2028 transitions. Word has length 318 [2020-08-21 18:19:15,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:19:15,364 INFO L479 AbstractCegarLoop]: Abstraction has 1297 states and 2028 transitions. [2020-08-21 18:19:15,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:19:15,364 INFO L276 IsEmpty]: Start isEmpty. Operand 1297 states and 2028 transitions. [2020-08-21 18:19:15,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-08-21 18:19:15,377 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:19:15,377 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:19:15,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:19:15,378 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:19:15,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:19:15,379 INFO L82 PathProgramCache]: Analyzing trace with hash 1367796252, now seen corresponding path program 1 times [2020-08-21 18:19:15,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:19:15,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958680473] [2020-08-21 18:19:15,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:19:15,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:16,408 WARN L193 SmtUtils]: Spent 613.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-21 18:19:16,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:19:16,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:16,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:19:16,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958680473] [2020-08-21 18:19:16,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:19:16,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:19:16,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132005483] [2020-08-21 18:19:16,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:19:16,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:19:16,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:19:16,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:19:16,581 INFO L87 Difference]: Start difference. First operand 1297 states and 2028 transitions. Second operand 4 states. [2020-08-21 18:19:17,273 WARN L193 SmtUtils]: Spent 644.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-21 18:19:22,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:19:22,201 INFO L93 Difference]: Finished difference Result 2671 states and 4201 transitions. [2020-08-21 18:19:22,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:19:22,202 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-08-21 18:19:22,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:19:22,223 INFO L225 Difference]: With dead ends: 2671 [2020-08-21 18:19:22,224 INFO L226 Difference]: Without dead ends: 2289 [2020-08-21 18:19:22,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:19:22,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2289 states. [2020-08-21 18:19:22,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2289 to 2287. [2020-08-21 18:19:22,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2287 states. [2020-08-21 18:19:22,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3564 transitions. [2020-08-21 18:19:22,379 INFO L78 Accepts]: Start accepts. Automaton has 2287 states and 3564 transitions. Word has length 318 [2020-08-21 18:19:22,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:19:22,382 INFO L479 AbstractCegarLoop]: Abstraction has 2287 states and 3564 transitions. [2020-08-21 18:19:22,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:19:22,382 INFO L276 IsEmpty]: Start isEmpty. Operand 2287 states and 3564 transitions. [2020-08-21 18:19:22,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-08-21 18:19:22,405 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:19:22,405 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:19:22,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:19:22,406 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:19:22,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:19:22,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1797025293, now seen corresponding path program 1 times [2020-08-21 18:19:22,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:19:22,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1295953537] [2020-08-21 18:19:22,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:19:22,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:24,022 WARN L193 SmtUtils]: Spent 835.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-21 18:19:24,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:19:24,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:24,191 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:19:24,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1295953537] [2020-08-21 18:19:24,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:19:24,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:19:24,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364210758] [2020-08-21 18:19:24,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:19:24,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:19:24,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:19:24,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:19:24,195 INFO L87 Difference]: Start difference. First operand 2287 states and 3564 transitions. Second operand 4 states. [2020-08-21 18:19:25,051 WARN L193 SmtUtils]: Spent 811.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-21 18:19:29,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:19:29,548 INFO L93 Difference]: Finished difference Result 4943 states and 7762 transitions. [2020-08-21 18:19:29,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:19:29,549 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-08-21 18:19:29,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:19:29,571 INFO L225 Difference]: With dead ends: 4943 [2020-08-21 18:19:29,571 INFO L226 Difference]: Without dead ends: 4229 [2020-08-21 18:19:29,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:19:29,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4229 states. [2020-08-21 18:19:29,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4229 to 4227. [2020-08-21 18:19:29,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4227 states. [2020-08-21 18:19:29,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4227 states to 4227 states and 6568 transitions. [2020-08-21 18:19:29,699 INFO L78 Accepts]: Start accepts. Automaton has 4227 states and 6568 transitions. Word has length 318 [2020-08-21 18:19:29,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:19:29,700 INFO L479 AbstractCegarLoop]: Abstraction has 4227 states and 6568 transitions. [2020-08-21 18:19:29,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:19:29,700 INFO L276 IsEmpty]: Start isEmpty. Operand 4227 states and 6568 transitions. [2020-08-21 18:19:29,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-08-21 18:19:29,711 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:19:29,711 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:19:29,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:19:29,712 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:19:29,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:19:29,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1914723175, now seen corresponding path program 1 times [2020-08-21 18:19:29,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:19:29,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [863265729] [2020-08-21 18:19:29,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:19:29,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:30,843 WARN L193 SmtUtils]: Spent 742.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-21 18:19:30,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:19:30,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:31,176 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:19:31,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [863265729] [2020-08-21 18:19:31,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:19:31,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:19:31,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430807137] [2020-08-21 18:19:31,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:19:31,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:19:31,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:19:31,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:19:31,182 INFO L87 Difference]: Start difference. First operand 4227 states and 6568 transitions. Second operand 4 states. [2020-08-21 18:19:32,039 WARN L193 SmtUtils]: Spent 791.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-21 18:19:36,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:19:36,545 INFO L93 Difference]: Finished difference Result 9359 states and 14670 transitions. [2020-08-21 18:19:36,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:19:36,550 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-08-21 18:19:36,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:19:36,586 INFO L225 Difference]: With dead ends: 9359 [2020-08-21 18:19:36,586 INFO L226 Difference]: Without dead ends: 8029 [2020-08-21 18:19:36,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:19:36,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8029 states. [2020-08-21 18:19:36,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8029 to 8027. [2020-08-21 18:19:36,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8027 states. [2020-08-21 18:19:36,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8027 states to 8027 states and 12440 transitions. [2020-08-21 18:19:36,821 INFO L78 Accepts]: Start accepts. Automaton has 8027 states and 12440 transitions. Word has length 318 [2020-08-21 18:19:36,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:19:36,822 INFO L479 AbstractCegarLoop]: Abstraction has 8027 states and 12440 transitions. [2020-08-21 18:19:36,824 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:19:36,824 INFO L276 IsEmpty]: Start isEmpty. Operand 8027 states and 12440 transitions. [2020-08-21 18:19:36,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-08-21 18:19:36,841 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:19:36,841 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:19:36,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:19:36,843 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:19:36,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:19:36,843 INFO L82 PathProgramCache]: Analyzing trace with hash 769893352, now seen corresponding path program 1 times [2020-08-21 18:19:36,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:19:36,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497347429] [2020-08-21 18:19:36,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:19:37,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:38,063 WARN L193 SmtUtils]: Spent 699.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-21 18:19:38,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:19:38,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:38,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:19:38,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497347429] [2020-08-21 18:19:38,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:19:38,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:19:38,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144088916] [2020-08-21 18:19:38,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:19:38,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:19:38,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:19:38,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:19:38,237 INFO L87 Difference]: Start difference. First operand 8027 states and 12440 transitions. Second operand 5 states. [2020-08-21 18:19:46,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:19:46,395 INFO L93 Difference]: Finished difference Result 23754 states and 36777 transitions. [2020-08-21 18:19:46,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:19:46,396 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 318 [2020-08-21 18:19:46,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:19:46,455 INFO L225 Difference]: With dead ends: 23754 [2020-08-21 18:19:46,455 INFO L226 Difference]: Without dead ends: 15742 [2020-08-21 18:19:46,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:19:46,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15742 states. [2020-08-21 18:19:46,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15742 to 15740. [2020-08-21 18:19:46,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15740 states. [2020-08-21 18:19:46,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15740 states to 15740 states and 24254 transitions. [2020-08-21 18:19:46,951 INFO L78 Accepts]: Start accepts. Automaton has 15740 states and 24254 transitions. Word has length 318 [2020-08-21 18:19:46,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:19:46,951 INFO L479 AbstractCegarLoop]: Abstraction has 15740 states and 24254 transitions. [2020-08-21 18:19:46,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:19:46,952 INFO L276 IsEmpty]: Start isEmpty. Operand 15740 states and 24254 transitions. [2020-08-21 18:19:46,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-08-21 18:19:46,981 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:19:46,982 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:19:46,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:19:46,986 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:19:46,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:19:46,987 INFO L82 PathProgramCache]: Analyzing trace with hash -685152901, now seen corresponding path program 1 times [2020-08-21 18:19:46,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:19:46,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089644864] [2020-08-21 18:19:46,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:19:47,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:47,811 WARN L193 SmtUtils]: Spent 581.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-21 18:19:47,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:19:47,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:48,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:19:48,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089644864] [2020-08-21 18:19:48,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:19:48,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:19:48,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673801609] [2020-08-21 18:19:48,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:19:48,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:19:48,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:19:48,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:19:48,084 INFO L87 Difference]: Start difference. First operand 15740 states and 24254 transitions. Second operand 4 states. [2020-08-21 18:19:57,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:19:57,984 INFO L93 Difference]: Finished difference Result 46481 states and 71518 transitions. [2020-08-21 18:19:57,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:19:57,984 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 320 [2020-08-21 18:19:57,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:19:58,045 INFO L225 Difference]: With dead ends: 46481 [2020-08-21 18:19:58,045 INFO L226 Difference]: Without dead ends: 30870 [2020-08-21 18:19:58,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:19:58,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30870 states.