/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:58:43,317 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:58:43,320 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:58:43,357 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:58:43,358 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:58:43,367 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:58:43,370 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:58:43,373 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:58:43,375 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:58:43,378 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:58:43,379 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:58:43,380 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:58:43,380 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:58:43,383 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:58:43,385 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:58:43,386 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:58:43,387 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:58:43,388 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:58:43,390 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:58:43,398 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:58:43,400 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:58:43,401 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:58:43,401 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:58:43,402 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:58:43,414 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 06:58:43,415 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 06:58:43,415 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 06:58:43,416 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 06:58:43,421 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 06:58:43,422 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-19 06:58:43,422 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-19 06:58:43,423 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-19 06:58:43,424 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-19 06:58:43,426 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-19 06:58:43,427 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-19 06:58:43,427 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-19 06:58:43,431 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-19 06:58:43,432 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-19 06:58:43,432 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:58:43,432 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:58:43,433 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:58:43,434 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 [2020-08-19 06:58:43,470 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:58:43,471 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:58:43,472 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:58:43,472 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:58:43,473 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:58:43,473 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:58:43,473 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:58:43,473 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:58:43,474 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:58:43,474 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:58:43,475 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:58:43,475 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:58:43,475 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:58:43,476 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:58:43,476 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:58:43,476 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:58:43,476 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:58:43,476 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:58:43,476 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:58:43,477 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:58:43,477 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:58:43,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:58:43,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:58:43,478 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:58:43,478 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:58:43,478 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:58:43,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:58:43,478 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:58:43,479 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:58:43,479 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; [2020-08-19 06:58:43,816 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:58:43,826 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:58:43,829 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:58:43,831 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:58:43,831 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:58:43,832 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-08-19 06:58:43,890 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/56ba8b0a9/9d208c9a791d4e4a84bf7405fda952bf/FLAG45ef54183 [2020-08-19 06:58:44,590 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:58:44,591 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-08-19 06:58:44,618 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/56ba8b0a9/9d208c9a791d4e4a84bf7405fda952bf/FLAG45ef54183 [2020-08-19 06:58:44,686 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/56ba8b0a9/9d208c9a791d4e4a84bf7405fda952bf [2020-08-19 06:58:44,697 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:58:44,699 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:58:44,703 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:58:44,703 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:58:44,707 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:58:44,708 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:58:44" (1/1) ... [2020-08-19 06:58:44,712 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39d6c161 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:44, skipping insertion in model container [2020-08-19 06:58:44,713 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:58:44" (1/1) ... [2020-08-19 06:58:44,722 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:58:44,907 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:58:46,567 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:58:46,583 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:58:47,538 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:58:47,579 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:58:47,581 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47 WrapperNode [2020-08-19 06:58:47,581 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:58:47,582 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:58:47,582 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:58:47,582 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:58:47,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47" (1/1) ... [2020-08-19 06:58:47,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47" (1/1) ... [2020-08-19 06:58:47,663 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47" (1/1) ... [2020-08-19 06:58:47,664 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47" (1/1) ... [2020-08-19 06:58:47,732 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47" (1/1) ... [2020-08-19 06:58:47,776 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47" (1/1) ... [2020-08-19 06:58:47,789 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47" (1/1) ... [2020-08-19 06:58:47,817 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:58:47,817 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:58:47,817 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:58:47,818 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:58:47,819 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47" (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 [2020-08-19 06:58:47,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:58:47,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:58:47,900 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 06:58:47,900 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:58:47,900 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:58:47,901 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-19 06:58:47,901 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-19 06:58:47,901 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-19 06:58:47,901 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-19 06:58:47,902 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 06:58:47,902 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 06:58:47,903 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-19 06:58:47,903 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-19 06:58:47,903 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-19 06:58:47,903 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-19 06:58:47,904 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-19 06:58:47,904 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-19 06:58:47,905 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-19 06:58:47,905 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-19 06:58:47,905 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-19 06:58:47,906 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:58:47,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:58:47,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:58:51,786 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:58:51,787 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-19 06:58:51,854 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:58:51 BoogieIcfgContainer [2020-08-19 06:58:51,854 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:58:51,857 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:58:51,858 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:58:51,861 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:58:51,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:58:44" (1/3) ... [2020-08-19 06:58:51,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62b09074 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:58:51, skipping insertion in model container [2020-08-19 06:58:51,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:47" (2/3) ... [2020-08-19 06:58:51,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62b09074 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:58:51, skipping insertion in model container [2020-08-19 06:58:51,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:58:51" (3/3) ... [2020-08-19 06:58:51,864 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-08-19 06:58:51,875 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:58:51,884 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-19 06:58:51,898 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-19 06:58:51,932 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:58:51,932 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:58:51,932 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:58:51,933 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:58:51,933 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:58:51,933 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:58:51,933 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:58:51,933 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:58:51,976 INFO L276 IsEmpty]: Start isEmpty. Operand 1393 states. [2020-08-19 06:58:52,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-08-19 06:58:52,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:58:52,023 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] [2020-08-19 06:58:52,023 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:58:52,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:58:52,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1447603851, now seen corresponding path program 1 times [2020-08-19 06:58:52,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:58:52,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373616145] [2020-08-19 06:58:52,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:58:53,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:58:55,510 WARN L193 SmtUtils]: Spent 980.00 ms on a formula simplification that was a NOOP. DAG size: 385 [2020-08-19 06:58:55,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:58:55,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:58:56,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:58:56,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373616145] [2020-08-19 06:58:56,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:58:56,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:58:56,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109207995] [2020-08-19 06:58:56,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:58:56,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:58:56,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:58:56,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:58:56,390 INFO L87 Difference]: Start difference. First operand 1393 states. Second operand 5 states. [2020-08-19 06:59:12,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:59:12,766 INFO L93 Difference]: Finished difference Result 4125 states and 7467 transitions. [2020-08-19 06:59:12,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:59:12,768 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 473 [2020-08-19 06:59:12,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:59:12,814 INFO L225 Difference]: With dead ends: 4125 [2020-08-19 06:59:12,814 INFO L226 Difference]: Without dead ends: 2741 [2020-08-19 06:59:12,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:59:12,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2741 states. [2020-08-19 06:59:13,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2741 to 2688. [2020-08-19 06:59:13,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2688 states. [2020-08-19 06:59:13,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2688 states to 2688 states and 4398 transitions. [2020-08-19 06:59:13,045 INFO L78 Accepts]: Start accepts. Automaton has 2688 states and 4398 transitions. Word has length 473 [2020-08-19 06:59:13,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:59:13,046 INFO L479 AbstractCegarLoop]: Abstraction has 2688 states and 4398 transitions. [2020-08-19 06:59:13,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:59:13,046 INFO L276 IsEmpty]: Start isEmpty. Operand 2688 states and 4398 transitions. [2020-08-19 06:59:13,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-08-19 06:59:13,066 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:59:13,067 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] [2020-08-19 06:59:13,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:59:13,068 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:59:13,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:59:13,069 INFO L82 PathProgramCache]: Analyzing trace with hash -369254340, now seen corresponding path program 1 times [2020-08-19 06:59:13,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:59:13,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219378346] [2020-08-19 06:59:13,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:59:13,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:59:14,655 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 385 [2020-08-19 06:59:14,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:59:14,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:59:15,316 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:59:15,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219378346] [2020-08-19 06:59:15,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:59:15,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 06:59:15,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70314209] [2020-08-19 06:59:15,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:59:15,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:59:15,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:59:15,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:59:15,320 INFO L87 Difference]: Start difference. First operand 2688 states and 4398 transitions. Second operand 4 states. [2020-08-19 06:59:32,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:59:32,658 INFO L93 Difference]: Finished difference Result 7793 states and 12713 transitions. [2020-08-19 06:59:32,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 06:59:32,664 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 475 [2020-08-19 06:59:32,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:59:32,701 INFO L225 Difference]: With dead ends: 7793 [2020-08-19 06:59:32,701 INFO L226 Difference]: Without dead ends: 5319 [2020-08-19 06:59:32,708 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 [2020-08-19 06:59:32,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5319 states. [2020-08-19 06:59:32,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5319 to 5268. [2020-08-19 06:59:32,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5268 states. [2020-08-19 06:59:32,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5268 states to 5268 states and 8596 transitions. [2020-08-19 06:59:32,906 INFO L78 Accepts]: Start accepts. Automaton has 5268 states and 8596 transitions. Word has length 475 [2020-08-19 06:59:32,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:59:32,910 INFO L479 AbstractCegarLoop]: Abstraction has 5268 states and 8596 transitions. [2020-08-19 06:59:32,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 06:59:32,911 INFO L276 IsEmpty]: Start isEmpty. Operand 5268 states and 8596 transitions. [2020-08-19 06:59:32,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-08-19 06:59:32,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:59:32,932 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:59:32,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:59:32,933 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:59:32,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:59:32,933 INFO L82 PathProgramCache]: Analyzing trace with hash -567190772, now seen corresponding path program 1 times [2020-08-19 06:59:32,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:59:32,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590696659] [2020-08-19 06:59:32,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:59:33,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:59:33,890 WARN L193 SmtUtils]: Spent 722.00 ms on a formula simplification that was a NOOP. DAG size: 385 [2020-08-19 06:59:33,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:59:33,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:59:34,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:59:34,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590696659] [2020-08-19 06:59:34,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:59:34,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 06:59:34,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021643539] [2020-08-19 06:59:34,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:59:34,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:59:34,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:59:34,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:59:34,160 INFO L87 Difference]: Start difference. First operand 5268 states and 8596 transitions. Second operand 4 states.