/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=SMALLEST --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 15:54:38,243 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:54:38,245 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:54:38,269 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:54:38,269 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:54:38,270 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:54:38,271 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:54:38,273 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:54:38,275 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:54:38,276 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:54:38,277 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:54:38,278 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:54:38,278 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:54:38,279 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:54:38,280 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:54:38,281 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:54:38,282 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:54:38,283 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:54:38,284 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:54:38,286 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:54:38,288 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:54:38,289 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:54:38,290 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:54:38,290 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:54:38,293 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 15:54:38,293 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 15:54:38,294 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 15:54:38,294 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 15:54:38,295 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 15:54:38,296 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 15:54:38,296 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 15:54:38,297 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 15:54:38,298 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 15:54:38,299 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 15:54:38,300 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 15:54:38,300 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 15:54:38,300 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 15:54:38,301 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 15:54:38,301 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:54:38,302 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:54:38,302 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:54:38,305 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 15:54:38,348 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:54:38,352 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:54:38,353 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:54:38,353 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:54:38,353 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:54:38,354 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:54:38,354 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:54:38,354 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:54:38,354 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:54:38,354 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:54:38,355 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:54:38,355 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:54:38,355 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:54:38,356 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:54:38,356 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:54:38,356 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:54:38,356 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:54:38,356 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:54:38,357 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:54:38,357 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:54:38,357 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:54:38,357 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:54:38,358 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:54:38,358 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:54:38,358 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:54:38,358 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:54:38,358 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:54:38,359 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:54:38,359 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:54:38,359 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=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:54:38,678 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:54:38,696 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:54:38,699 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:54:38,701 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:54:38,702 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:54:38,703 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 15:54:38,770 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cb1ee6816/5832d9045f2e4e95b026d87163e2e0d5/FLAG12a1f07cd [2020-08-21 15:54:39,448 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:54:39,448 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 15:54:39,474 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cb1ee6816/5832d9045f2e4e95b026d87163e2e0d5/FLAG12a1f07cd [2020-08-21 15:54:39,628 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cb1ee6816/5832d9045f2e4e95b026d87163e2e0d5 [2020-08-21 15:54:39,636 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:54:39,637 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:54:39,638 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:54:39,638 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:54:39,642 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:54:39,643 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:54:39" (1/1) ... [2020-08-21 15:54:39,645 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b07a84a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:39, skipping insertion in model container [2020-08-21 15:54:39,645 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:54:39" (1/1) ... [2020-08-21 15:54:39,656 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:54:39,839 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:54:41,577 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:54:41,594 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:54:42,643 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:54:42,667 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:54:42,667 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42 WrapperNode [2020-08-21 15:54:42,668 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:54:42,668 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:54:42,668 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:54:42,669 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:54:42,682 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42" (1/1) ... [2020-08-21 15:54:42,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42" (1/1) ... [2020-08-21 15:54:42,727 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42" (1/1) ... [2020-08-21 15:54:42,728 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42" (1/1) ... [2020-08-21 15:54:42,806 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42" (1/1) ... [2020-08-21 15:54:42,876 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42" (1/1) ... [2020-08-21 15:54:42,900 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42" (1/1) ... [2020-08-21 15:54:42,926 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:54:42,928 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:54:42,928 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:54:42,928 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:54:42,930 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42" (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 15:54:43,040 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:54:43,041 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:54:43,041 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 15:54:43,041 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:54:43,042 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:54:43,042 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 15:54:43,042 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 15:54:43,042 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-21 15:54:43,043 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 15:54:43,043 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 15:54:43,043 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-21 15:54:43,043 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-21 15:54:43,044 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-21 15:54:43,044 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-21 15:54:43,044 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-21 15:54:43,045 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-21 15:54:43,045 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-21 15:54:43,045 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 15:54:43,045 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 15:54:43,046 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:54:43,046 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:54:43,046 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:54:47,575 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:54:47,576 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 15:54:47,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:54:47 BoogieIcfgContainer [2020-08-21 15:54:47,587 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:54:47,588 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:54:47,588 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:54:47,591 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:54:47,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:54:39" (1/3) ... [2020-08-21 15:54:47,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6523d007 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:54:47, skipping insertion in model container [2020-08-21 15:54:47,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:54:42" (2/3) ... [2020-08-21 15:54:47,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6523d007 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:54:47, skipping insertion in model container [2020-08-21 15:54:47,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:54:47" (3/3) ... [2020-08-21 15:54:47,595 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 15:54:47,605 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:54:47,616 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:54:47,631 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:54:47,660 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:54:47,660 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:54:47,660 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:54:47,660 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:54:47,661 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:54:47,661 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:54:47,661 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:54:47,661 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:54:47,699 INFO L276 IsEmpty]: Start isEmpty. Operand 1431 states. [2020-08-21 15:54:47,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-08-21 15:54:47,736 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:54:47,737 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 15:54:47,738 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:54:47,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:54:47,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1961833088, now seen corresponding path program 1 times [2020-08-21 15:54:47,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:54:47,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118059055] [2020-08-21 15:54:47,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:54:49,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:54:51,000 WARN L193 SmtUtils]: Spent 801.00 ms on a formula simplification that was a NOOP. DAG size: 403 [2020-08-21 15:54:51,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:54:51,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:54:51,362 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 15:54:51,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118059055] [2020-08-21 15:54:51,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:54:51,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:54:51,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051118823] [2020-08-21 15:54:51,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:54:51,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:54:51,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:54:51,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:54:51,384 INFO L87 Difference]: Start difference. First operand 1431 states. Second operand 5 states. [2020-08-21 15:55:06,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:55:06,599 INFO L93 Difference]: Finished difference Result 4236 states and 7632 transitions. [2020-08-21 15:55:06,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:55:06,601 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 487 [2020-08-21 15:55:06,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:55:06,640 INFO L225 Difference]: With dead ends: 4236 [2020-08-21 15:55:06,640 INFO L226 Difference]: Without dead ends: 2814 [2020-08-21 15:55:06,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:55:06,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2814 states. [2020-08-21 15:55:06,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2814 to 2812. [2020-08-21 15:55:06,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2812 states. [2020-08-21 15:55:06,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2812 states to 2812 states and 4639 transitions. [2020-08-21 15:55:06,852 INFO L78 Accepts]: Start accepts. Automaton has 2812 states and 4639 transitions. Word has length 487 [2020-08-21 15:55:06,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:55:06,854 INFO L479 AbstractCegarLoop]: Abstraction has 2812 states and 4639 transitions. [2020-08-21 15:55:06,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:55:06,854 INFO L276 IsEmpty]: Start isEmpty. Operand 2812 states and 4639 transitions. [2020-08-21 15:55:06,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-08-21 15:55:06,869 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:55:06,870 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 15:55:06,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:55:06,871 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:55:06,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:55:06,871 INFO L82 PathProgramCache]: Analyzing trace with hash 39211808, now seen corresponding path program 1 times [2020-08-21 15:55:06,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:55:06,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682963921] [2020-08-21 15:55:06,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:55:07,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:55:08,741 WARN L193 SmtUtils]: Spent 1.03 s on a formula simplification that was a NOOP. DAG size: 403 [2020-08-21 15:55:08,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:55:08,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:55:09,405 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 15:55:09,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682963921] [2020-08-21 15:55:09,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:55:09,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:55:09,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464233945] [2020-08-21 15:55:09,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:55:09,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:55:09,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:55:09,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:55:09,410 INFO L87 Difference]: Start difference. First operand 2812 states and 4639 transitions. Second operand 4 states. [2020-08-21 15:55:27,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:55:27,114 INFO L93 Difference]: Finished difference Result 8158 states and 13422 transitions. [2020-08-21 15:55:27,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:55:27,117 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 489 [2020-08-21 15:55:27,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:55:27,147 INFO L225 Difference]: With dead ends: 8158 [2020-08-21 15:55:27,147 INFO L226 Difference]: Without dead ends: 5560 [2020-08-21 15:55:27,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:55:27,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5560 states. [2020-08-21 15:55:27,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5560 to 5558. [2020-08-21 15:55:27,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5558 states. [2020-08-21 15:55:27,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5558 states to 5558 states and 9141 transitions. [2020-08-21 15:55:27,361 INFO L78 Accepts]: Start accepts. Automaton has 5558 states and 9141 transitions. Word has length 489 [2020-08-21 15:55:27,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:55:27,363 INFO L479 AbstractCegarLoop]: Abstraction has 5558 states and 9141 transitions. [2020-08-21 15:55:27,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:55:27,364 INFO L276 IsEmpty]: Start isEmpty. Operand 5558 states and 9141 transitions. [2020-08-21 15:55:27,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-08-21 15:55:27,380 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:55:27,382 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 15:55:27,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:55:27,386 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:55:27,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:55:27,387 INFO L82 PathProgramCache]: Analyzing trace with hash -960654715, now seen corresponding path program 1 times [2020-08-21 15:55:27,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:55:27,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386876099] [2020-08-21 15:55:27,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:55:27,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:55:28,433 WARN L193 SmtUtils]: Spent 834.00 ms on a formula simplification that was a NOOP. DAG size: 403 [2020-08-21 15:55:28,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:55:28,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:55:28,601 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 15:55:28,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386876099] [2020-08-21 15:55:28,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:55:28,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:55:28,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729166178] [2020-08-21 15:55:28,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:55:28,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:55:28,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:55:28,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:55:28,604 INFO L87 Difference]: Start difference. First operand 5558 states and 9141 transitions. Second operand 4 states.