/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=HIGHLEXORDER --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.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:07:52,867 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:07:52,870 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:07:52,905 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 19:07:52,905 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:07:52,906 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:07:52,908 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:07:52,909 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:07:52,911 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:07:52,912 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:07:52,913 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:07:52,914 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:07:52,914 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:07:52,915 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:07:52,916 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:07:52,917 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:07:52,918 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:07:52,918 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:07:52,920 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:07:52,922 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:07:52,923 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:07:52,924 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:07:52,925 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:07:52,926 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:07:52,928 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 19:07:52,929 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 19:07:52,929 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 19:07:52,930 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 19:07:52,930 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 19:07:52,931 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 19:07:52,931 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 19:07:52,932 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 19:07:52,932 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 19:07:52,933 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 19:07:52,934 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 19:07:52,934 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 19:07:52,935 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 19:07:52,935 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 19:07:52,935 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:07:52,936 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:07:52,937 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:07:52,938 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 19:07:52,976 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:07:52,976 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:07:52,977 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:07:52,978 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:07:52,978 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:07:52,978 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:07:52,978 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:07:52,978 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:07:52,978 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:07:52,979 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:07:52,979 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:07:52,979 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:07:52,979 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:07:52,980 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:07:52,980 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:07:52,980 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:07:52,980 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:07:52,980 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:07:52,981 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:07:52,982 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:07:52,983 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:07:52,983 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:07:52,983 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:07:52,983 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:07:52,983 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:07:52,984 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:07:52,984 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:07:52,984 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:07:52,984 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:07:52,985 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=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 19:07:53,292 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:07:53,304 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:07:53,308 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:07:53,309 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:07:53,309 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:07:53,310 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 19:07:53,391 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dd1169f28/c2acc49e1f5b4744a8df95b40e23ef9b/FLAGa811c360c [2020-08-21 19:07:54,087 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:07:54,088 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 19:07:54,108 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dd1169f28/c2acc49e1f5b4744a8df95b40e23ef9b/FLAGa811c360c [2020-08-21 19:07:54,211 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dd1169f28/c2acc49e1f5b4744a8df95b40e23ef9b [2020-08-21 19:07:54,219 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:07:54,221 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:07:54,222 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:07:54,222 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:07:54,225 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:07:54,227 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:07:54" (1/1) ... [2020-08-21 19:07:54,229 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@701ef800 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:54, skipping insertion in model container [2020-08-21 19:07:54,230 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:07:54" (1/1) ... [2020-08-21 19:07:54,237 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:07:54,414 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:07:55,929 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:07:55,943 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:07:57,092 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:07:57,141 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:07:57,142 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57 WrapperNode [2020-08-21 19:07:57,143 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:07:57,144 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:07:57,144 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:07:57,144 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:07:57,165 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57" (1/1) ... [2020-08-21 19:07:57,167 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57" (1/1) ... [2020-08-21 19:07:57,243 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57" (1/1) ... [2020-08-21 19:07:57,244 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57" (1/1) ... [2020-08-21 19:07:57,317 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57" (1/1) ... [2020-08-21 19:07:57,351 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57" (1/1) ... [2020-08-21 19:07:57,367 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57" (1/1) ... [2020-08-21 19:07:57,390 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:07:57,391 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:07:57,391 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:07:57,391 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:07:57,392 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57" (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 19:07:57,479 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:07:57,479 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:07:57,480 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 19:07:57,480 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:07:57,481 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:07:57,481 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 19:07:57,481 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 19:07:57,481 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-21 19:07:57,482 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 19:07:57,483 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 19:07:57,483 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-21 19:07:57,483 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-21 19:07:57,484 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-21 19:07:57,484 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-21 19:07:57,484 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-21 19:07:57,485 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-21 19:07:57,485 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-21 19:07:57,486 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 19:07:57,486 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 19:07:57,487 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:07:57,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:07:57,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:08:01,946 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:08:01,947 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 19:08:01,958 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:08:01 BoogieIcfgContainer [2020-08-21 19:08:01,958 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:08:01,960 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:08:01,960 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:08:01,963 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:08:01,963 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:07:54" (1/3) ... [2020-08-21 19:08:01,964 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f860851 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:08:01, skipping insertion in model container [2020-08-21 19:08:01,964 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:07:57" (2/3) ... [2020-08-21 19:08:01,965 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f860851 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:08:01, skipping insertion in model container [2020-08-21 19:08:01,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:08:01" (3/3) ... [2020-08-21 19:08:01,967 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 19:08:01,977 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:08:01,986 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:08:02,001 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:08:02,031 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:08:02,031 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:08:02,031 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:08:02,031 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:08:02,031 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:08:02,032 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:08:02,032 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:08:02,032 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:08:02,076 INFO L276 IsEmpty]: Start isEmpty. Operand 1431 states. [2020-08-21 19:08:02,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-08-21 19:08:02,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:08:02,127 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] [2020-08-21 19:08:02,128 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:08:02,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:08:02,136 INFO L82 PathProgramCache]: Analyzing trace with hash -1961833088, now seen corresponding path program 1 times [2020-08-21 19:08:02,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:08:02,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27723098] [2020-08-21 19:08:02,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:08:04,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:08:05,826 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 403 [2020-08-21 19:08:05,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:08:05,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:08:06,186 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 19:08:06,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27723098] [2020-08-21 19:08:06,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:08:06,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:08:06,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763509832] [2020-08-21 19:08:06,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:08:06,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:08:06,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:08:06,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:08:06,210 INFO L87 Difference]: Start difference. First operand 1431 states. Second operand 5 states. [2020-08-21 19:08:24,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:08:24,135 INFO L93 Difference]: Finished difference Result 4236 states and 7632 transitions. [2020-08-21 19:08:24,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:08:24,138 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 487 [2020-08-21 19:08:24,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:08:24,178 INFO L225 Difference]: With dead ends: 4236 [2020-08-21 19:08:24,179 INFO L226 Difference]: Without dead ends: 2814 [2020-08-21 19:08:24,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:08:24,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2814 states. [2020-08-21 19:08:24,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2814 to 2812. [2020-08-21 19:08:24,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2812 states. [2020-08-21 19:08:24,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2812 states to 2812 states and 4639 transitions. [2020-08-21 19:08:24,404 INFO L78 Accepts]: Start accepts. Automaton has 2812 states and 4639 transitions. Word has length 487 [2020-08-21 19:08:24,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:08:24,406 INFO L479 AbstractCegarLoop]: Abstraction has 2812 states and 4639 transitions. [2020-08-21 19:08:24,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:08:24,406 INFO L276 IsEmpty]: Start isEmpty. Operand 2812 states and 4639 transitions. [2020-08-21 19:08:24,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-08-21 19:08:24,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:08:24,422 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] [2020-08-21 19:08:24,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:08:24,423 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:08:24,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:08:24,423 INFO L82 PathProgramCache]: Analyzing trace with hash 39211808, now seen corresponding path program 1 times [2020-08-21 19:08:24,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:08:24,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1356787816] [2020-08-21 19:08:24,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:08:24,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:08:26,469 WARN L193 SmtUtils]: Spent 1.55 s on a formula simplification that was a NOOP. DAG size: 403 [2020-08-21 19:08:26,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:08:26,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:08:26,766 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 19:08:26,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1356787816] [2020-08-21 19:08:26,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:08:26,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:08:26,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124024978] [2020-08-21 19:08:26,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:08:26,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:08:26,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:08:26,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:08:26,771 INFO L87 Difference]: Start difference. First operand 2812 states and 4639 transitions. Second operand 4 states. [2020-08-21 19:08:47,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:08:47,143 INFO L93 Difference]: Finished difference Result 8158 states and 13422 transitions. [2020-08-21 19:08:47,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:08:47,144 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 489 [2020-08-21 19:08:47,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:08:47,172 INFO L225 Difference]: With dead ends: 8158 [2020-08-21 19:08:47,172 INFO L226 Difference]: Without dead ends: 5560 [2020-08-21 19:08:47,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:08:47,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5560 states. [2020-08-21 19:08:47,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5560 to 5558. [2020-08-21 19:08:47,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5558 states. [2020-08-21 19:08:47,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5558 states to 5558 states and 9141 transitions. [2020-08-21 19:08:47,366 INFO L78 Accepts]: Start accepts. Automaton has 5558 states and 9141 transitions. Word has length 489 [2020-08-21 19:08:47,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:08:47,368 INFO L479 AbstractCegarLoop]: Abstraction has 5558 states and 9141 transitions. [2020-08-21 19:08:47,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:08:47,369 INFO L276 IsEmpty]: Start isEmpty. Operand 5558 states and 9141 transitions. [2020-08-21 19:08:47,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-08-21 19:08:47,384 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:08:47,386 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] [2020-08-21 19:08:47,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:08:47,389 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:08:47,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:08:47,390 INFO L82 PathProgramCache]: Analyzing trace with hash -960654715, now seen corresponding path program 1 times [2020-08-21 19:08:47,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:08:47,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1430048341] [2020-08-21 19:08:47,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:08:47,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:08:48,731 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 403 [2020-08-21 19:08:48,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:08:48,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:08:48,900 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 19:08:48,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1430048341] [2020-08-21 19:08:48,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:08:48,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:08:48,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002266183] [2020-08-21 19:08:48,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:08:48,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:08:48,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:08:48,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:08:48,903 INFO L87 Difference]: Start difference. First operand 5558 states and 9141 transitions. Second operand 4 states.