/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:19:30,379 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:19:30,383 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:19:30,406 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:19:30,406 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:19:30,407 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:19:30,409 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:19:30,410 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:19:30,412 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:19:30,413 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:19:30,413 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:19:30,414 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:19:30,415 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:19:30,416 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:19:30,417 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:19:30,418 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:19:30,419 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:19:30,419 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:19:30,421 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:19:30,423 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:19:30,424 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:19:30,425 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:19:30,426 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:19:30,427 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:19:30,429 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 18:19:30,430 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 18:19:30,430 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 18:19:30,431 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 18:19:30,431 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 18:19:30,432 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 18:19:30,432 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 18:19:30,433 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 18:19:30,433 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 18:19:30,434 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 18:19:30,435 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 18:19:30,435 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 18:19:30,436 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 18:19:30,436 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 18:19:30,436 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:19:30,437 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:19:30,438 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:19:30,439 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 18:19:30,461 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:19:30,462 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:19:30,463 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:19:30,463 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:19:30,463 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:19:30,463 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:19:30,464 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:19:30,464 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:19:30,464 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:19:30,464 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:19:30,464 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:19:30,465 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:19:30,465 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:19:30,465 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:19:30,465 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:19:30,465 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:19:30,465 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:19:30,466 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:19:30,466 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:19:30,466 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:19:30,466 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:19:30,466 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:19:30,467 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:19:30,467 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:19:30,467 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:19:30,467 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:19:30,467 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:19:30,468 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:19:30,468 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:19:30,468 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:19:30,772 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:19:30,789 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:19:30,792 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:19:30,793 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:19:30,794 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:19:30,794 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-21 18:19:30,852 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/99e7b535b/0c5dd32b12204058baab6e1c2072342d/FLAG20c66779e [2020-08-21 18:19:31,533 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:19:31,534 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-21 18:19:31,558 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/99e7b535b/0c5dd32b12204058baab6e1c2072342d/FLAG20c66779e [2020-08-21 18:19:31,689 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/99e7b535b/0c5dd32b12204058baab6e1c2072342d [2020-08-21 18:19:31,699 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:19:31,701 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:19:31,704 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:19:31,704 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:19:31,708 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:19:31,708 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:19:31" (1/1) ... [2020-08-21 18:19:31,711 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bbd1661 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:31, skipping insertion in model container [2020-08-21 18:19:31,711 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:19:31" (1/1) ... [2020-08-21 18:19:31,719 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:19:31,912 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:19:33,491 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:19:33,516 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:19:34,905 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:19:34,929 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:19:34,929 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34 WrapperNode [2020-08-21 18:19:34,929 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:19:34,930 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:19:34,930 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:19:34,930 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:19:34,944 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34" (1/1) ... [2020-08-21 18:19:34,944 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34" (1/1) ... [2020-08-21 18:19:34,987 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34" (1/1) ... [2020-08-21 18:19:34,988 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34" (1/1) ... [2020-08-21 18:19:35,064 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34" (1/1) ... [2020-08-21 18:19:35,108 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34" (1/1) ... [2020-08-21 18:19:35,129 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34" (1/1) ... [2020-08-21 18:19:35,151 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:19:35,151 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:19:35,152 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:19:35,152 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:19:35,153 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:19:35,240 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:19:35,240 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:19:35,240 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 18:19:35,241 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:19:35,241 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:19:35,241 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 18:19:35,242 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 18:19:35,242 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-21 18:19:35,242 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 18:19:35,243 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 18:19:35,244 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-21 18:19:35,244 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-21 18:19:35,244 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-21 18:19:35,244 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-21 18:19:35,244 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-21 18:19:35,245 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-21 18:19:35,245 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-21 18:19:35,245 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 18:19:35,246 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 18:19:35,246 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:19:35,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:19:35,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:19:39,729 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:19:39,729 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 18:19:39,739 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:19:39 BoogieIcfgContainer [2020-08-21 18:19:39,740 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:19:39,741 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:19:39,741 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:19:39,744 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:19:39,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:19:31" (1/3) ... [2020-08-21 18:19:39,745 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@380f2db5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:19:39, skipping insertion in model container [2020-08-21 18:19:39,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:34" (2/3) ... [2020-08-21 18:19:39,745 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@380f2db5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:19:39, skipping insertion in model container [2020-08-21 18:19:39,746 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:19:39" (3/3) ... [2020-08-21 18:19:39,747 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-21 18:19:39,757 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:19:39,766 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-21 18:19:39,779 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-21 18:19:39,808 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:19:39,808 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:19:39,808 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:19:39,808 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:19:39,809 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:19:39,809 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:19:39,809 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:19:39,809 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:19:39,850 INFO L276 IsEmpty]: Start isEmpty. Operand 1484 states. [2020-08-21 18:19:39,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-08-21 18:19:39,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:19:39,889 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] [2020-08-21 18:19:39,889 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:19:39,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:19:39,896 INFO L82 PathProgramCache]: Analyzing trace with hash -1064488228, now seen corresponding path program 1 times [2020-08-21 18:19:39,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:19:39,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244422553] [2020-08-21 18:19:39,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:19:41,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:43,693 WARN L193 SmtUtils]: Spent 1.31 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-21 18:19:43,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:19:43,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:19:44,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:19:44,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244422553] [2020-08-21 18:19:44,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:19:44,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:19:44,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120684938] [2020-08-21 18:19:44,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:19:44,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:19:44,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:19:44,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:19:44,304 INFO L87 Difference]: Start difference. First operand 1484 states. Second operand 5 states. [2020-08-21 18:20:00,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:20:00,483 INFO L93 Difference]: Finished difference Result 4394 states and 7936 transitions. [2020-08-21 18:20:00,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:20:00,486 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 484 [2020-08-21 18:20:00,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:20:00,532 INFO L225 Difference]: With dead ends: 4394 [2020-08-21 18:20:00,532 INFO L226 Difference]: Without dead ends: 2919 [2020-08-21 18:20:00,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:20:00,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2919 states. [2020-08-21 18:20:00,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2919 to 2865. [2020-08-21 18:20:00,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2865 states. [2020-08-21 18:20:00,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2865 states to 2865 states and 4721 transitions. [2020-08-21 18:20:00,755 INFO L78 Accepts]: Start accepts. Automaton has 2865 states and 4721 transitions. Word has length 484 [2020-08-21 18:20:00,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:20:00,757 INFO L479 AbstractCegarLoop]: Abstraction has 2865 states and 4721 transitions. [2020-08-21 18:20:00,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:20:00,757 INFO L276 IsEmpty]: Start isEmpty. Operand 2865 states and 4721 transitions. [2020-08-21 18:20:00,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-08-21 18:20:00,770 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:20:00,770 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] [2020-08-21 18:20:00,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:20:00,771 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:20:00,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:20:00,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1721765960, now seen corresponding path program 1 times [2020-08-21 18:20:00,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:20:00,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133872214] [2020-08-21 18:20:00,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:20:01,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:20:02,858 WARN L193 SmtUtils]: Spent 1.49 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-21 18:20:02,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:20:02,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:20:03,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:20:03,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133872214] [2020-08-21 18:20:03,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:20:03,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:20:03,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615030771] [2020-08-21 18:20:03,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:20:03,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:20:03,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:20:03,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:20:03,210 INFO L87 Difference]: Start difference. First operand 2865 states and 4721 transitions. Second operand 4 states. [2020-08-21 18:20:22,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:20:22,970 INFO L93 Difference]: Finished difference Result 8316 states and 13666 transitions. [2020-08-21 18:20:22,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:20:22,971 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 486 [2020-08-21 18:20:22,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:20:23,000 INFO L225 Difference]: With dead ends: 8316 [2020-08-21 18:20:23,000 INFO L226 Difference]: Without dead ends: 5665 [2020-08-21 18:20:23,007 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 18:20:23,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5665 states. [2020-08-21 18:20:23,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5665 to 5613. [2020-08-21 18:20:23,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5613 states. [2020-08-21 18:20:23,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5613 states to 5613 states and 9225 transitions. [2020-08-21 18:20:23,210 INFO L78 Accepts]: Start accepts. Automaton has 5613 states and 9225 transitions. Word has length 486 [2020-08-21 18:20:23,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:20:23,212 INFO L479 AbstractCegarLoop]: Abstraction has 5613 states and 9225 transitions. [2020-08-21 18:20:23,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:20:23,212 INFO L276 IsEmpty]: Start isEmpty. Operand 5613 states and 9225 transitions. [2020-08-21 18:20:23,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-08-21 18:20:23,236 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:20:23,238 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 18:20:23,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:20:23,242 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:20:23,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:20:23,244 INFO L82 PathProgramCache]: Analyzing trace with hash 326918239, now seen corresponding path program 1 times [2020-08-21 18:20:23,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:20:23,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799031774] [2020-08-21 18:20:23,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:20:23,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:20:24,533 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-21 18:20:24,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:20:24,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:20:24,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:20:24,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799031774] [2020-08-21 18:20:24,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:20:24,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:20:24,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369030203] [2020-08-21 18:20:24,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:20:24,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:20:24,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:20:24,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:20:24,766 INFO L87 Difference]: Start difference. First operand 5613 states and 9225 transitions. Second operand 4 states.