/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.2 -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 23:42:50,604 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 23:42:50,608 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 23:42:50,650 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 23:42:50,650 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 23:42:50,660 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 23:42:50,661 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 23:42:50,664 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 23:42:50,667 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 23:42:50,670 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 23:42:50,671 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 23:42:50,673 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 23:42:50,673 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 23:42:50,676 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 23:42:50,679 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 23:42:50,680 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 23:42:50,682 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 23:42:50,683 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 23:42:50,685 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 23:42:50,692 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 23:42:50,694 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 23:42:50,696 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 23:42:50,697 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 23:42:50,697 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 23:42:50,711 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 23:42:50,711 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 23:42:50,711 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 23:42:50,712 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 23:42:50,713 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 23:42:50,717 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 23:42:50,717 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 23:42:50,722 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 23:42:50,723 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 23:42:50,724 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 23:42:50,728 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 23:42:50,728 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 23:42:50,729 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 23:42:50,729 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 23:42:50,729 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 23:42:50,733 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 23:42:50,734 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 23:42:50,735 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 23:42:50,775 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 23:42:50,775 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 23:42:50,777 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 23:42:50,777 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 23:42:50,778 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 23:42:50,778 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 23:42:50,778 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 23:42:50,778 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 23:42:50,778 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 23:42:50,779 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 23:42:50,780 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 23:42:50,780 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 23:42:50,780 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 23:42:50,781 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 23:42:50,781 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 23:42:50,781 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 23:42:50,781 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 23:42:50,782 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 23:42:50,782 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 23:42:50,782 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 23:42:50,782 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 23:42:50,782 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 23:42:50,782 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 23:42:50,783 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 23:42:50,783 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 23:42:50,783 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 23:42:50,783 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 23:42:50,783 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 23:42:50,784 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 23:42:50,784 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=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; [2020-08-18 23:42:51,072 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 23:42:51,085 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 23:42:51,089 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 23:42:51,091 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 23:42:51,091 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 23:42:51,092 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 23:42:51,153 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a579042be/db15c6b7663140068133c4279840a648/FLAG858f132e8 [2020-08-18 23:42:51,883 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 23:42:51,884 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 23:42:51,918 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a579042be/db15c6b7663140068133c4279840a648/FLAG858f132e8 [2020-08-18 23:42:52,040 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a579042be/db15c6b7663140068133c4279840a648 [2020-08-18 23:42:52,049 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 23:42:52,050 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 23:42:52,051 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 23:42:52,052 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 23:42:52,055 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 23:42:52,056 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:42:52" (1/1) ... [2020-08-18 23:42:52,059 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d77a43a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:52, skipping insertion in model container [2020-08-18 23:42:52,060 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:42:52" (1/1) ... [2020-08-18 23:42:52,067 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 23:42:52,260 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 23:42:53,717 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:42:53,731 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 23:42:55,199 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:42:55,239 INFO L208 MainTranslator]: Completed translation [2020-08-18 23:42:55,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55 WrapperNode [2020-08-18 23:42:55,240 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 23:42:55,241 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 23:42:55,241 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 23:42:55,241 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 23:42:55,257 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55" (1/1) ... [2020-08-18 23:42:55,259 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55" (1/1) ... [2020-08-18 23:42:55,340 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55" (1/1) ... [2020-08-18 23:42:55,341 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55" (1/1) ... [2020-08-18 23:42:55,421 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55" (1/1) ... [2020-08-18 23:42:55,462 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55" (1/1) ... [2020-08-18 23:42:55,490 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55" (1/1) ... [2020-08-18 23:42:55,524 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 23:42:55,525 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 23:42:55,525 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 23:42:55,525 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 23:42:55,527 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55" (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 23:42:55,615 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 23:42:55,615 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 23:42:55,616 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 23:42:55,616 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 23:42:55,617 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 23:42:55,617 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 23:42:55,617 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-18 23:42:55,617 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 23:42:55,617 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-18 23:42:55,618 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 23:42:55,618 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 23:42:55,619 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-18 23:42:55,619 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-18 23:42:55,619 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-18 23:42:55,619 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-18 23:42:55,620 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-18 23:42:55,620 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-18 23:42:55,621 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-18 23:42:55,621 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 23:42:55,621 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 23:42:55,621 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 23:42:55,622 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 23:42:55,622 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 23:42:59,828 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 23:42:59,828 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 23:42:59,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:42:59 BoogieIcfgContainer [2020-08-18 23:42:59,845 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 23:42:59,847 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 23:42:59,847 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 23:42:59,850 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 23:42:59,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 11:42:52" (1/3) ... [2020-08-18 23:42:59,851 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@796a1097 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:42:59, skipping insertion in model container [2020-08-18 23:42:59,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:42:55" (2/3) ... [2020-08-18 23:42:59,852 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@796a1097 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:42:59, skipping insertion in model container [2020-08-18 23:42:59,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:42:59" (3/3) ... [2020-08-18 23:42:59,854 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 23:42:59,864 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 23:42:59,874 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 23:42:59,889 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 23:42:59,916 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 23:42:59,917 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 23:42:59,917 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 23:42:59,917 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 23:42:59,917 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 23:42:59,917 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 23:42:59,917 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 23:42:59,917 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 23:42:59,960 INFO L276 IsEmpty]: Start isEmpty. Operand 1449 states. [2020-08-18 23:43:00,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-08-18 23:43:00,009 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:43:00,010 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 23:43:00,011 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:43:00,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:43:00,017 INFO L82 PathProgramCache]: Analyzing trace with hash -2033441387, now seen corresponding path program 1 times [2020-08-18 23:43:00,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:43:00,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621547506] [2020-08-18 23:43:00,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:43:01,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:43:02,556 WARN L193 SmtUtils]: Spent 769.00 ms on a formula simplification that was a NOOP. DAG size: 397 [2020-08-18 23:43:02,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:43:02,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:43:02,838 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 23:43:02,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621547506] [2020-08-18 23:43:02,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:43:02,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 23:43:02,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017840397] [2020-08-18 23:43:02,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 23:43:02,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:43:02,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 23:43:02,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:43:02,866 INFO L87 Difference]: Start difference. First operand 1449 states. Second operand 4 states. [2020-08-18 23:43:03,680 WARN L193 SmtUtils]: Spent 720.00 ms on a formula simplification that was a NOOP. DAG size: 398 [2020-08-18 23:43:14,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:43:14,155 INFO L93 Difference]: Finished difference Result 2488 states and 4423 transitions. [2020-08-18 23:43:14,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 23:43:14,157 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-08-18 23:43:14,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:43:14,210 INFO L225 Difference]: With dead ends: 2488 [2020-08-18 23:43:14,210 INFO L226 Difference]: Without dead ends: 2186 [2020-08-18 23:43:14,222 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 23:43:14,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2186 states. [2020-08-18 23:43:14,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2186 to 2184. [2020-08-18 23:43:14,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2184 states. [2020-08-18 23:43:14,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2184 states to 2184 states and 3563 transitions. [2020-08-18 23:43:14,408 INFO L78 Accepts]: Start accepts. Automaton has 2184 states and 3563 transitions. Word has length 496 [2020-08-18 23:43:14,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:43:14,410 INFO L479 AbstractCegarLoop]: Abstraction has 2184 states and 3563 transitions. [2020-08-18 23:43:14,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 23:43:14,410 INFO L276 IsEmpty]: Start isEmpty. Operand 2184 states and 3563 transitions. [2020-08-18 23:43:14,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-08-18 23:43:14,425 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:43:14,426 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 23:43:14,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 23:43:14,427 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:43:14,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:43:14,427 INFO L82 PathProgramCache]: Analyzing trace with hash 426855444, now seen corresponding path program 1 times [2020-08-18 23:43:14,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:43:14,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283152577] [2020-08-18 23:43:14,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:43:15,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:43:16,904 WARN L193 SmtUtils]: Spent 1.06 s on a formula simplification that was a NOOP. DAG size: 397 [2020-08-18 23:43:16,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:43:16,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:43:17,581 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 23:43:17,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283152577] [2020-08-18 23:43:17,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:43:17,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 23:43:17,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647842279] [2020-08-18 23:43:17,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 23:43:17,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:43:17,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 23:43:17,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 23:43:17,588 INFO L87 Difference]: Start difference. First operand 2184 states and 3563 transitions. Second operand 5 states. [2020-08-18 23:43:32,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:43:32,689 INFO L93 Difference]: Finished difference Result 6476 states and 10564 transitions. [2020-08-18 23:43:32,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 23:43:32,689 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 496 [2020-08-18 23:43:32,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:43:32,715 INFO L225 Difference]: With dead ends: 6476 [2020-08-18 23:43:32,716 INFO L226 Difference]: Without dead ends: 4309 [2020-08-18 23:43:32,723 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 23:43:32,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4309 states. [2020-08-18 23:43:32,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4309 to 4307. [2020-08-18 23:43:32,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4307 states. [2020-08-18 23:43:32,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4307 states to 4307 states and 7000 transitions. [2020-08-18 23:43:32,899 INFO L78 Accepts]: Start accepts. Automaton has 4307 states and 7000 transitions. Word has length 496 [2020-08-18 23:43:32,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:43:32,900 INFO L479 AbstractCegarLoop]: Abstraction has 4307 states and 7000 transitions. [2020-08-18 23:43:32,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 23:43:32,901 INFO L276 IsEmpty]: Start isEmpty. Operand 4307 states and 7000 transitions. [2020-08-18 23:43:32,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-08-18 23:43:32,931 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:43:32,932 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 23:43:32,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 23:43:32,933 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:43:32,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:43:32,934 INFO L82 PathProgramCache]: Analyzing trace with hash 589891249, now seen corresponding path program 1 times [2020-08-18 23:43:32,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:43:32,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483405874] [2020-08-18 23:43:32,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:43:33,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:43:34,229 WARN L193 SmtUtils]: Spent 682.00 ms on a formula simplification that was a NOOP. DAG size: 397 [2020-08-18 23:43:34,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:43:34,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:43:34,567 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 23:43:34,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483405874] [2020-08-18 23:43:34,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:43:34,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 23:43:34,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207066588] [2020-08-18 23:43:34,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 23:43:34,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:43:34,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 23:43:34,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:43:34,570 INFO L87 Difference]: Start difference. First operand 4307 states and 7000 transitions. Second operand 4 states.