/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=1.0 --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_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 02:23:39,620 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 02:23:39,623 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 02:23:39,649 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 02:23:39,649 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 02:23:39,651 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 02:23:39,652 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 02:23:39,654 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 02:23:39,655 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 02:23:39,656 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 02:23:39,657 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 02:23:39,658 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 02:23:39,658 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 02:23:39,659 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 02:23:39,660 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 02:23:39,662 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 02:23:39,662 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 02:23:39,663 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 02:23:39,665 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 02:23:39,667 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 02:23:39,669 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 02:23:39,670 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 02:23:39,671 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 02:23:39,672 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 02:23:39,675 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 02:23:39,677 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 02:23:39,677 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 02:23:39,678 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 02:23:39,679 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 02:23:39,680 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 02:23:39,680 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 02:23:39,681 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 02:23:39,682 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 02:23:39,682 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 02:23:39,683 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 02:23:39,684 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 02:23:39,684 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 02:23:39,685 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 02:23:39,685 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 02:23:39,686 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 02:23:39,686 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 02:23:39,687 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 [2020-08-22 02:23:39,710 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 02:23:39,710 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 02:23:39,711 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 02:23:39,712 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 02:23:39,712 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 02:23:39,712 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 02:23:39,712 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 02:23:39,712 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 02:23:39,713 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 02:23:39,713 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 02:23:39,713 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 02:23:39,713 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 02:23:39,713 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 02:23:39,714 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 02:23:39,714 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 02:23:39,714 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 02:23:39,714 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 02:23:39,714 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 02:23:39,715 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 02:23:39,715 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 02:23:39,715 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 02:23:39,715 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 02:23:39,715 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 02:23:39,715 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 02:23:39,716 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 02:23:39,716 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 02:23:39,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 02:23:39,716 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 02:23:39,716 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 02:23:39,717 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=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; [2020-08-22 02:23:40,036 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 02:23:40,048 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 02:23:40,051 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 02:23:40,053 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 02:23:40,053 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 02:23:40,054 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 02:23:40,114 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5c0363e04/6a446b44b43b4fbfb436514c5b6ad0bb/FLAG492d8e3f2 [2020-08-22 02:23:40,848 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 02:23:40,851 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 02:23:40,889 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5c0363e04/6a446b44b43b4fbfb436514c5b6ad0bb/FLAG492d8e3f2 [2020-08-22 02:23:40,982 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5c0363e04/6a446b44b43b4fbfb436514c5b6ad0bb [2020-08-22 02:23:40,992 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 02:23:40,995 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 02:23:40,996 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 02:23:40,997 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 02:23:41,001 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 02:23:41,002 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 02:23:40" (1/1) ... [2020-08-22 02:23:41,007 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b40a169 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:41, skipping insertion in model container [2020-08-22 02:23:41,007 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 02:23:40" (1/1) ... [2020-08-22 02:23:41,018 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 02:23:41,209 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 02:23:42,773 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 02:23:42,786 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 02:23:44,141 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 02:23:44,182 INFO L208 MainTranslator]: Completed translation [2020-08-22 02:23:44,183 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44 WrapperNode [2020-08-22 02:23:44,183 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 02:23:44,184 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 02:23:44,184 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 02:23:44,184 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 02:23:44,203 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44" (1/1) ... [2020-08-22 02:23:44,203 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44" (1/1) ... [2020-08-22 02:23:44,265 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44" (1/1) ... [2020-08-22 02:23:44,265 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44" (1/1) ... [2020-08-22 02:23:44,348 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44" (1/1) ... [2020-08-22 02:23:44,386 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44" (1/1) ... [2020-08-22 02:23:44,400 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44" (1/1) ... [2020-08-22 02:23:44,420 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 02:23:44,421 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 02:23:44,421 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 02:23:44,421 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 02:23:44,422 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44" (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 [2020-08-22 02:23:44,489 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 02:23:44,490 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 02:23:44,490 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 02:23:44,490 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 02:23:44,490 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 02:23:44,491 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 02:23:44,491 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-22 02:23:44,491 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-22 02:23:44,491 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 02:23:44,492 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 02:23:44,492 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-22 02:23:44,492 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-22 02:23:44,492 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-22 02:23:44,492 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-22 02:23:44,493 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-22 02:23:44,493 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-22 02:23:44,493 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-22 02:23:44,493 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-22 02:23:44,493 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-22 02:23:44,494 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 02:23:44,494 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 02:23:44,494 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 02:23:48,457 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 02:23:48,457 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 02:23:48,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 02:23:48 BoogieIcfgContainer [2020-08-22 02:23:48,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 02:23:48,482 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 02:23:48,482 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 02:23:48,486 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 02:23:48,486 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 02:23:40" (1/3) ... [2020-08-22 02:23:48,487 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b45d3d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 02:23:48, skipping insertion in model container [2020-08-22 02:23:48,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:23:44" (2/3) ... [2020-08-22 02:23:48,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b45d3d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 02:23:48, skipping insertion in model container [2020-08-22 02:23:48,488 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 02:23:48" (3/3) ... [2020-08-22 02:23:48,492 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 02:23:48,504 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 02:23:48,515 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-22 02:23:48,529 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-22 02:23:48,563 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 02:23:48,564 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 02:23:48,564 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 02:23:48,564 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 02:23:48,564 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 02:23:48,564 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 02:23:48,564 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 02:23:48,564 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 02:23:48,611 INFO L276 IsEmpty]: Start isEmpty. Operand 1371 states. [2020-08-22 02:23:48,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2020-08-22 02:23:48,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:23:48,660 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] [2020-08-22 02:23:48,661 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:23:48,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:23:48,668 INFO L82 PathProgramCache]: Analyzing trace with hash -856462850, now seen corresponding path program 1 times [2020-08-22 02:23:48,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:23:48,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852858159] [2020-08-22 02:23:48,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:23:50,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:23:52,501 WARN L193 SmtUtils]: Spent 1.23 s on a formula simplification that was a NOOP. DAG size: 391 [2020-08-22 02:23:52,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:23:52,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:23:52,963 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:23:52,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852858159] [2020-08-22 02:23:52,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:23:52,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 02:23:52,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672290765] [2020-08-22 02:23:52,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 02:23:52,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:23:52,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 02:23:52,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 02:23:52,987 INFO L87 Difference]: Start difference. First operand 1371 states. Second operand 5 states. [2020-08-22 02:24:10,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:24:10,195 INFO L93 Difference]: Finished difference Result 4059 states and 7350 transitions. [2020-08-22 02:24:10,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 02:24:10,201 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 464 [2020-08-22 02:24:10,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:24:10,263 INFO L225 Difference]: With dead ends: 4059 [2020-08-22 02:24:10,264 INFO L226 Difference]: Without dead ends: 2697 [2020-08-22 02:24:10,284 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 [2020-08-22 02:24:10,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2697 states. [2020-08-22 02:24:10,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2697 to 2647. [2020-08-22 02:24:10,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2647 states. [2020-08-22 02:24:10,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 4347 transitions. [2020-08-22 02:24:10,573 INFO L78 Accepts]: Start accepts. Automaton has 2647 states and 4347 transitions. Word has length 464 [2020-08-22 02:24:10,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:24:10,578 INFO L479 AbstractCegarLoop]: Abstraction has 2647 states and 4347 transitions. [2020-08-22 02:24:10,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 02:24:10,578 INFO L276 IsEmpty]: Start isEmpty. Operand 2647 states and 4347 transitions. [2020-08-22 02:24:10,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 467 [2020-08-22 02:24:10,593 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:24:10,593 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] [2020-08-22 02:24:10,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 02:24:10,594 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:24:10,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:24:10,595 INFO L82 PathProgramCache]: Analyzing trace with hash -1286826198, now seen corresponding path program 1 times [2020-08-22 02:24:10,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:24:10,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [578217642] [2020-08-22 02:24:10,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:24:10,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:24:12,373 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 391 [2020-08-22 02:24:12,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:24:12,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:24:12,900 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:24:12,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [578217642] [2020-08-22 02:24:12,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:24:12,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 02:24:12,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290464672] [2020-08-22 02:24:12,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 02:24:12,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:24:12,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 02:24:12,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 02:24:12,907 INFO L87 Difference]: Start difference. First operand 2647 states and 4347 transitions. Second operand 4 states. [2020-08-22 02:24:30,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:24:30,899 INFO L93 Difference]: Finished difference Result 7670 states and 12560 transitions. [2020-08-22 02:24:30,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 02:24:30,899 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 466 [2020-08-22 02:24:30,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:24:30,927 INFO L225 Difference]: With dead ends: 7670 [2020-08-22 02:24:30,928 INFO L226 Difference]: Without dead ends: 5237 [2020-08-22 02:24:30,934 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 [2020-08-22 02:24:30,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5237 states. [2020-08-22 02:24:31,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5237 to 5189. [2020-08-22 02:24:31,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5189 states. [2020-08-22 02:24:31,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5189 states to 5189 states and 8497 transitions. [2020-08-22 02:24:31,129 INFO L78 Accepts]: Start accepts. Automaton has 5189 states and 8497 transitions. Word has length 466 [2020-08-22 02:24:31,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:24:31,130 INFO L479 AbstractCegarLoop]: Abstraction has 5189 states and 8497 transitions. [2020-08-22 02:24:31,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 02:24:31,130 INFO L276 IsEmpty]: Start isEmpty. Operand 5189 states and 8497 transitions. [2020-08-22 02:24:31,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-22 02:24:31,148 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:24:31,148 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] [2020-08-22 02:24:31,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 02:24:31,149 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:24:31,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:24:31,149 INFO L82 PathProgramCache]: Analyzing trace with hash -244647039, now seen corresponding path program 1 times [2020-08-22 02:24:31,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:24:31,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846817424] [2020-08-22 02:24:31,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:24:31,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:24:32,080 WARN L193 SmtUtils]: Spent 737.00 ms on a formula simplification that was a NOOP. DAG size: 391 [2020-08-22 02:24:32,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:24:32,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:24:32,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:24:32,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846817424] [2020-08-22 02:24:32,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:24:32,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 02:24:32,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334481314] [2020-08-22 02:24:32,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 02:24:32,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:24:32,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 02:24:32,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 02:24:32,303 INFO L87 Difference]: Start difference. First operand 5189 states and 8497 transitions. Second operand 4 states.