/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:29:08,069 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:29:08,071 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:29:08,113 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:29:08,116 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:29:08,117 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:29:08,118 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:29:08,122 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:29:08,127 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:29:08,127 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:29:08,128 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:29:08,131 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:29:08,132 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:29:08,133 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:29:08,135 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:29:08,136 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:29:08,136 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:29:08,140 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:29:08,143 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:29:08,144 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:29:08,149 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:29:08,150 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:29:08,150 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:29:08,151 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:29:08,155 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 20:29:08,155 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 20:29:08,155 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 20:29:08,159 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 20:29:08,159 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 20:29:08,160 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 20:29:08,160 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 20:29:08,161 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 20:29:08,161 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 20:29:08,162 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 20:29:08,164 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 20:29:08,164 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 20:29:08,165 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 20:29:08,165 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 20:29:08,165 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:29:08,166 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:29:08,168 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:29:08,168 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 [2020-08-18 20:29:08,213 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:29:08,213 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:29:08,215 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:29:08,216 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:29:08,216 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:29:08,216 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:29:08,217 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:29:08,217 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:29:08,217 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:29:08,217 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:29:08,218 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:29:08,218 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:29:08,219 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:29:08,219 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:29:08,220 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:29:08,220 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:29:08,220 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:29:08,220 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:29:08,220 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:29:08,221 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:29:08,221 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:29:08,221 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:29:08,221 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:29:08,221 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:29:08,222 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:29:08,222 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:29:08,222 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:29:08,222 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:29:08,222 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:29:08,222 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=5;interpolation-heuristic=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:29:08,491 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:29:08,503 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:29:08,506 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:29:08,507 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:29:08,508 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:29:08,508 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 20:29:08,566 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/95bfc640c/1afa7d69eecb41b6944e504f7e91bec4/FLAG73ab66771 [2020-08-18 20:29:09,272 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:29:09,275 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 20:29:09,302 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/95bfc640c/1afa7d69eecb41b6944e504f7e91bec4/FLAG73ab66771 [2020-08-18 20:29:09,388 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/95bfc640c/1afa7d69eecb41b6944e504f7e91bec4 [2020-08-18 20:29:09,397 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:29:09,399 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:29:09,400 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:29:09,400 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:29:09,403 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:29:09,404 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:29:09" (1/1) ... [2020-08-18 20:29:09,407 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f8e2c60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:09, skipping insertion in model container [2020-08-18 20:29:09,407 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:29:09" (1/1) ... [2020-08-18 20:29:09,414 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:29:09,607 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:29:11,074 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:29:11,088 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:29:12,215 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:29:12,254 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:29:12,255 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12 WrapperNode [2020-08-18 20:29:12,255 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:29:12,256 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:29:12,256 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:29:12,256 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:29:12,272 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12" (1/1) ... [2020-08-18 20:29:12,274 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12" (1/1) ... [2020-08-18 20:29:12,326 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12" (1/1) ... [2020-08-18 20:29:12,327 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12" (1/1) ... [2020-08-18 20:29:12,404 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12" (1/1) ... [2020-08-18 20:29:12,456 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12" (1/1) ... [2020-08-18 20:29:12,473 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12" (1/1) ... [2020-08-18 20:29:12,494 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:29:12,494 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:29:12,495 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:29:12,495 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:29:12,496 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12" (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 [2020-08-18 20:29:12,563 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:29:12,563 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:29:12,563 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 20:29:12,564 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:29:12,564 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:29:12,564 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 20:29:12,565 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-18 20:29:12,565 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 20:29:12,565 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-18 20:29:12,565 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 20:29:12,566 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 20:29:12,566 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-18 20:29:12,566 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-18 20:29:12,566 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-18 20:29:12,566 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-18 20:29:12,567 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-18 20:29:12,567 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-18 20:29:12,567 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-18 20:29:12,567 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 20:29:12,568 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 20:29:12,568 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:29:12,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:29:12,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:29:16,041 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:29:16,041 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 20:29:16,056 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:29:16 BoogieIcfgContainer [2020-08-18 20:29:16,056 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:29:16,058 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:29:16,058 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:29:16,061 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:29:16,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:29:09" (1/3) ... [2020-08-18 20:29:16,062 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a2b52c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:29:16, skipping insertion in model container [2020-08-18 20:29:16,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:12" (2/3) ... [2020-08-18 20:29:16,063 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a2b52c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:29:16, skipping insertion in model container [2020-08-18 20:29:16,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:29:16" (3/3) ... [2020-08-18 20:29:16,064 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 20:29:16,074 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:29:16,085 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:29:16,098 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:29:16,131 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:29:16,131 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:29:16,131 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:29:16,131 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:29:16,131 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:29:16,131 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:29:16,133 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:29:16,133 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:29:16,170 INFO L276 IsEmpty]: Start isEmpty. Operand 1449 states. [2020-08-18 20:29:16,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-08-18 20:29:16,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:29:16,219 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:29:16,219 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:29:16,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:29:16,226 INFO L82 PathProgramCache]: Analyzing trace with hash -2033441387, now seen corresponding path program 1 times [2020-08-18 20:29:16,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:29:16,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795469610] [2020-08-18 20:29:16,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:29:17,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:29:18,920 WARN L193 SmtUtils]: Spent 764.00 ms on a formula simplification that was a NOOP. DAG size: 397 [2020-08-18 20:29:18,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:29:18,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:29:19,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:29:19,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795469610] [2020-08-18 20:29:19,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:29:19,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 20:29:19,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024780360] [2020-08-18 20:29:19,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:29:19,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:29:19,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:29:19,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:29:19,255 INFO L87 Difference]: Start difference. First operand 1449 states. Second operand 4 states. [2020-08-18 20:29:20,075 WARN L193 SmtUtils]: Spent 734.00 ms on a formula simplification that was a NOOP. DAG size: 398 [2020-08-18 20:29:29,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:29:29,854 INFO L93 Difference]: Finished difference Result 2488 states and 4423 transitions. [2020-08-18 20:29:29,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:29:29,857 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-08-18 20:29:29,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:29:29,899 INFO L225 Difference]: With dead ends: 2488 [2020-08-18 20:29:29,899 INFO L226 Difference]: Without dead ends: 2186 [2020-08-18 20:29:29,906 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 [2020-08-18 20:29:29,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2186 states. [2020-08-18 20:29:30,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2186 to 2184. [2020-08-18 20:29:30,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2184 states. [2020-08-18 20:29:30,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2184 states to 2184 states and 3563 transitions. [2020-08-18 20:29:30,083 INFO L78 Accepts]: Start accepts. Automaton has 2184 states and 3563 transitions. Word has length 496 [2020-08-18 20:29:30,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:29:30,085 INFO L479 AbstractCegarLoop]: Abstraction has 2184 states and 3563 transitions. [2020-08-18 20:29:30,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:29:30,086 INFO L276 IsEmpty]: Start isEmpty. Operand 2184 states and 3563 transitions. [2020-08-18 20:29:30,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-08-18 20:29:30,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:29:30,100 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:29:30,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:29:30,101 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:29:30,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:29:30,102 INFO L82 PathProgramCache]: Analyzing trace with hash 426855444, now seen corresponding path program 1 times [2020-08-18 20:29:30,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:29:30,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266156885] [2020-08-18 20:29:30,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:29:31,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:29:32,625 WARN L193 SmtUtils]: Spent 1.06 s on a formula simplification that was a NOOP. DAG size: 397 [2020-08-18 20:29:32,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:29:32,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:29:33,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:29:33,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266156885] [2020-08-18 20:29:33,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:29:33,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:29:33,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449773722] [2020-08-18 20:29:33,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:29:33,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:29:33,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:29:33,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:29:33,310 INFO L87 Difference]: Start difference. First operand 2184 states and 3563 transitions. Second operand 5 states. [2020-08-18 20:29:47,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:29:47,062 INFO L93 Difference]: Finished difference Result 6476 states and 10564 transitions. [2020-08-18 20:29:47,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:29:47,065 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 496 [2020-08-18 20:29:47,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:29:47,087 INFO L225 Difference]: With dead ends: 6476 [2020-08-18 20:29:47,087 INFO L226 Difference]: Without dead ends: 4309 [2020-08-18 20:29:47,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:29:47,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4309 states. [2020-08-18 20:29:47,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4309 to 4307. [2020-08-18 20:29:47,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4307 states. [2020-08-18 20:29:47,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4307 states to 4307 states and 7000 transitions. [2020-08-18 20:29:47,277 INFO L78 Accepts]: Start accepts. Automaton has 4307 states and 7000 transitions. Word has length 496 [2020-08-18 20:29:47,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:29:47,278 INFO L479 AbstractCegarLoop]: Abstraction has 4307 states and 7000 transitions. [2020-08-18 20:29:47,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:29:47,278 INFO L276 IsEmpty]: Start isEmpty. Operand 4307 states and 7000 transitions. [2020-08-18 20:29:47,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-08-18 20:29:47,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:29:47,295 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:29:47,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:29:47,297 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:29:47,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:29:47,298 INFO L82 PathProgramCache]: Analyzing trace with hash 589891249, now seen corresponding path program 1 times [2020-08-18 20:29:47,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:29:47,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678485426] [2020-08-18 20:29:47,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:29:47,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:29:48,643 WARN L193 SmtUtils]: Spent 753.00 ms on a formula simplification that was a NOOP. DAG size: 397 [2020-08-18 20:29:48,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:29:48,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:29:48,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:29:48,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [678485426] [2020-08-18 20:29:48,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:29:48,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 20:29:48,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792591137] [2020-08-18 20:29:48,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:29:48,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:29:48,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:29:48,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:29:48,953 INFO L87 Difference]: Start difference. First operand 4307 states and 7000 transitions. Second operand 4 states. [2020-08-18 20:30:06,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:30:06,181 INFO L93 Difference]: Finished difference Result 12605 states and 20441 transitions. [2020-08-18 20:30:06,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:30:06,181 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 498 [2020-08-18 20:30:06,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:30:06,221 INFO L225 Difference]: With dead ends: 12605 [2020-08-18 20:30:06,222 INFO L226 Difference]: Without dead ends: 8512 [2020-08-18 20:30:06,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:30:06,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8512 states. [2020-08-18 20:30:06,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8512 to 8510. [2020-08-18 20:30:06,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8510 states. [2020-08-18 20:30:06,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8510 states to 8510 states and 13785 transitions. [2020-08-18 20:30:06,545 INFO L78 Accepts]: Start accepts. Automaton has 8510 states and 13785 transitions. Word has length 498 [2020-08-18 20:30:06,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:30:06,546 INFO L479 AbstractCegarLoop]: Abstraction has 8510 states and 13785 transitions. [2020-08-18 20:30:06,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:30:06,546 INFO L276 IsEmpty]: Start isEmpty. Operand 8510 states and 13785 transitions. [2020-08-18 20:30:06,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-08-18 20:30:06,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:30:06,565 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:30:06,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:30:06,566 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:30:06,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:30:06,566 INFO L82 PathProgramCache]: Analyzing trace with hash -844140139, now seen corresponding path program 1 times [2020-08-18 20:30:06,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:30:06,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227189199] [2020-08-18 20:30:06,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:30:06,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat