/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 --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.2 --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.3.1.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-25 04:38:08,949 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 04:38:08,953 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 04:38:08,979 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 04:38:08,980 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 04:38:08,981 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 04:38:08,982 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 04:38:08,984 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 04:38:08,986 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 04:38:08,987 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 04:38:08,988 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 04:38:08,990 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 04:38:08,990 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 04:38:08,991 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 04:38:08,992 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 04:38:08,994 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 04:38:08,994 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 04:38:08,996 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 04:38:08,997 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 04:38:08,999 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 04:38:09,001 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 04:38:09,002 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 04:38:09,004 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 04:38:09,004 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 04:38:09,007 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 04:38:09,007 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 04:38:09,008 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 04:38:09,008 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 04:38:09,009 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 04:38:09,010 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 04:38:09,010 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 04:38:09,011 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 04:38:09,012 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 04:38:09,013 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 04:38:09,014 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 04:38:09,014 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 04:38:09,015 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 04:38:09,015 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 04:38:09,015 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 04:38:09,016 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 04:38:09,017 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 04:38:09,018 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 [2020-09-25 04:38:09,055 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 04:38:09,056 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 04:38:09,057 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 04:38:09,057 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 04:38:09,058 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 04:38:09,058 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 04:38:09,058 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 04:38:09,058 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 04:38:09,058 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 04:38:09,059 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 04:38:09,059 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 04:38:09,059 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 04:38:09,059 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 04:38:09,059 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 04:38:09,060 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 04:38:09,063 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 04:38:09,063 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 04:38:09,063 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 04:38:09,064 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 04:38:09,064 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 04:38:09,064 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 04:38:09,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 04:38:09,064 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 04:38:09,065 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 04:38:09,065 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 04:38:09,065 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 04:38:09,065 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 04:38:09,065 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 04:38:09,066 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 04:38:09,067 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.rcfgbuilder: Size of a code block -> SingleStatement 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 -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; [2020-09-25 04:38:09,594 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 04:38:09,620 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 04:38:09,625 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 04:38:09,627 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 04:38:09,629 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 04:38:09,630 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-09-25 04:38:09,700 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/509f54f5d/c6e05481c8bb45bfa6e61c766e51a38e/FLAG2effa6778 [2020-09-25 04:38:10,362 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 04:38:10,363 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-09-25 04:38:10,388 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/509f54f5d/c6e05481c8bb45bfa6e61c766e51a38e/FLAG2effa6778 [2020-09-25 04:38:10,564 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/509f54f5d/c6e05481c8bb45bfa6e61c766e51a38e [2020-09-25 04:38:10,578 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 04:38:10,584 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 04:38:10,585 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 04:38:10,586 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 04:38:10,590 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 04:38:10,591 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 04:38:10" (1/1) ... [2020-09-25 04:38:10,596 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@658c4011 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:10, skipping insertion in model container [2020-09-25 04:38:10,596 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 04:38:10" (1/1) ... [2020-09-25 04:38:10,605 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 04:38:10,683 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 04:38:11,443 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 04:38:11,459 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 04:38:11,972 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 04:38:11,998 INFO L208 MainTranslator]: Completed translation [2020-09-25 04:38:11,999 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11 WrapperNode [2020-09-25 04:38:11,999 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 04:38:12,000 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 04:38:12,000 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 04:38:12,000 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 04:38:12,020 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11" (1/1) ... [2020-09-25 04:38:12,021 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11" (1/1) ... [2020-09-25 04:38:12,040 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11" (1/1) ... [2020-09-25 04:38:12,041 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11" (1/1) ... [2020-09-25 04:38:12,108 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11" (1/1) ... [2020-09-25 04:38:12,142 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11" (1/1) ... [2020-09-25 04:38:12,147 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11" (1/1) ... [2020-09-25 04:38:12,157 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 04:38:12,157 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 04:38:12,158 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 04:38:12,158 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 04:38:12,160 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11" (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 [2020-09-25 04:38:12,258 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 04:38:12,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 04:38:12,259 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-25 04:38:12,259 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 04:38:12,259 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 04:38:12,259 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-25 04:38:12,260 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-09-25 04:38:12,260 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-09-25 04:38:12,260 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-09-25 04:38:12,260 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-25 04:38:12,261 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-25 04:38:12,261 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-09-25 04:38:12,261 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-09-25 04:38:12,261 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-09-25 04:38:12,261 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-09-25 04:38:12,262 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-09-25 04:38:12,262 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-09-25 04:38:12,262 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-09-25 04:38:12,262 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 04:38:12,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 04:38:12,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 04:38:14,569 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 04:38:14,569 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-25 04:38:14,585 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 04:38:14 BoogieIcfgContainer [2020-09-25 04:38:14,585 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 04:38:14,587 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 04:38:14,587 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 04:38:14,591 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 04:38:14,591 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 04:38:10" (1/3) ... [2020-09-25 04:38:14,592 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c6bb504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 04:38:14, skipping insertion in model container [2020-09-25 04:38:14,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 04:38:11" (2/3) ... [2020-09-25 04:38:14,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c6bb504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 04:38:14, skipping insertion in model container [2020-09-25 04:38:14,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 04:38:14" (3/3) ... [2020-09-25 04:38:14,596 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-09-25 04:38:14,608 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 04:38:14,624 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 5 error locations. [2020-09-25 04:38:14,646 INFO L251 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2020-09-25 04:38:14,679 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 04:38:14,679 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 04:38:14,679 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 04:38:14,679 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 04:38:14,680 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 04:38:14,680 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 04:38:14,680 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 04:38:14,680 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 04:38:14,724 INFO L276 IsEmpty]: Start isEmpty. Operand 1233 states. [2020-09-25 04:38:14,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 457 [2020-09-25 04:38:14,765 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 04:38:14,767 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] [2020-09-25 04:38:14,767 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr4ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr3ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 04:38:14,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 04:38:14,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1303335379, now seen corresponding path program 1 times [2020-09-25 04:38:14,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 04:38:14,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821138554] [2020-09-25 04:38:14,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 04:38:15,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 04:38:15,540 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:15,925 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:16,268 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:16,582 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:16,776 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:17,137 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:17,571 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:20,330 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 04:38:20,330 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 463 [2020-09-25 04:38:20,330 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-09-25 04:38:20,330 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5041 [2020-09-25 04:38:20,335 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 04:38:20,335 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 04:38:20,336 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 04:38:20,336 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 207 [2020-09-25 04:38:20,337 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 207 [2020-09-25 04:38:20,337 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 6 [2020-09-25 04:38:21,039 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 196 [2020-09-25 04:38:21,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 04:38:21,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 04:38:21,080 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:21,135 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 04:38:21,136 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 74 [2020-09-25 04:38:21,136 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 04:38:21,136 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 68 [2020-09-25 04:38:21,137 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 04:38:21,137 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 04:38:21,138 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 04:38:21,138 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 04:38:21,138 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 04:38:21,139 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-09-25 04:38:21,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 04:38:21,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821138554] [2020-09-25 04:38:21,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 04:38:21,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-25 04:38:21,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511695564] [2020-09-25 04:38:21,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-25 04:38:21,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 04:38:21,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-25 04:38:21,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 04:38:21,822 INFO L87 Difference]: Start difference. First operand 1233 states. Second operand 4 states. [2020-09-25 04:38:26,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 04:38:26,627 INFO L93 Difference]: Finished difference Result 2019 states and 2601 transitions. [2020-09-25 04:38:26,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-25 04:38:26,633 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 456 [2020-09-25 04:38:26,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 04:38:26,667 INFO L225 Difference]: With dead ends: 2019 [2020-09-25 04:38:26,667 INFO L226 Difference]: Without dead ends: 1445 [2020-09-25 04:38:26,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 04:38:26,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1445 states. [2020-09-25 04:38:26,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1445 to 1438. [2020-09-25 04:38:26,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1438 states. [2020-09-25 04:38:26,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1438 states to 1438 states and 1723 transitions. [2020-09-25 04:38:26,832 INFO L78 Accepts]: Start accepts. Automaton has 1438 states and 1723 transitions. Word has length 456 [2020-09-25 04:38:26,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 04:38:26,835 INFO L479 AbstractCegarLoop]: Abstraction has 1438 states and 1723 transitions. [2020-09-25 04:38:26,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-25 04:38:26,836 INFO L276 IsEmpty]: Start isEmpty. Operand 1438 states and 1723 transitions. [2020-09-25 04:38:26,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 457 [2020-09-25 04:38:26,852 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 04:38:26,853 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] [2020-09-25 04:38:26,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 04:38:26,855 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr4ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr3ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 04:38:26,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 04:38:26,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1418962381, now seen corresponding path program 1 times [2020-09-25 04:38:26,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 04:38:26,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145780004] [2020-09-25 04:38:26,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 04:38:26,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 04:38:27,156 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:27,426 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:27,684 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:27,856 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:28,029 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:28,171 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:28,505 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:31,073 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:32,013 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 04:38:32,013 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 463 [2020-09-25 04:38:32,014 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 04:38:32,014 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5009 [2020-09-25 04:38:32,016 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 04:38:32,016 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 04:38:32,016 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 04:38:32,017 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 208 [2020-09-25 04:38:32,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 218 [2020-09-25 04:38:32,037 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 21 [2020-09-25 04:38:32,564 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 196 [2020-09-25 04:38:32,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 04:38:32,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 04:38:32,585 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:32,636 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 04:38:32,636 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 74 [2020-09-25 04:38:32,636 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 04:38:32,636 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 60 [2020-09-25 04:38:32,637 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 04:38:32,637 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 04:38:32,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 04:38:32,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 04:38:32,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 04:38:32,638 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 04:38:32,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 04:38:32,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145780004] [2020-09-25 04:38:32,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 04:38:32,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-25 04:38:32,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584584436] [2020-09-25 04:38:32,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-25 04:38:32,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 04:38:32,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-25 04:38:32,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 04:38:32,932 INFO L87 Difference]: Start difference. First operand 1438 states and 1723 transitions. Second operand 4 states. [2020-09-25 04:38:37,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 04:38:37,462 INFO L93 Difference]: Finished difference Result 2635 states and 3268 transitions. [2020-09-25 04:38:37,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-25 04:38:37,463 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 456 [2020-09-25 04:38:37,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 04:38:37,475 INFO L225 Difference]: With dead ends: 2635 [2020-09-25 04:38:37,475 INFO L226 Difference]: Without dead ends: 2144 [2020-09-25 04:38:37,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 04:38:37,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2144 states. [2020-09-25 04:38:37,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2144 to 2132. [2020-09-25 04:38:37,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2132 states. [2020-09-25 04:38:37,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2132 states to 2132 states and 2619 transitions. [2020-09-25 04:38:37,541 INFO L78 Accepts]: Start accepts. Automaton has 2132 states and 2619 transitions. Word has length 456 [2020-09-25 04:38:37,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 04:38:37,542 INFO L479 AbstractCegarLoop]: Abstraction has 2132 states and 2619 transitions. [2020-09-25 04:38:37,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-25 04:38:37,543 INFO L276 IsEmpty]: Start isEmpty. Operand 2132 states and 2619 transitions. [2020-09-25 04:38:37,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 457 [2020-09-25 04:38:37,554 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 04:38:37,555 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] [2020-09-25 04:38:37,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 04:38:37,555 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr4ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr3ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 04:38:37,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 04:38:37,556 INFO L82 PathProgramCache]: Analyzing trace with hash 496290573, now seen corresponding path program 1 times [2020-09-25 04:38:37,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 04:38:37,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2095546927] [2020-09-25 04:38:37,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 04:38:37,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 04:38:37,805 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:37,995 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:38,191 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:38,352 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:38,485 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:38,612 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:38,907 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:41,405 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:42,732 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 04:38:42,732 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 463 [2020-09-25 04:38:42,733 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 04:38:42,733 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5053 [2020-09-25 04:38:42,733 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 04:38:42,734 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 04:38:42,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-25 04:38:42,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 176 [2020-09-25 04:38:42,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 121 [2020-09-25 04:38:42,734 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 04:38:43,266 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification that was a NOOP. DAG size: 196 [2020-09-25 04:38:43,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 04:38:43,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 04:38:43,288 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:43,334 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 04:38:43,334 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 74 [2020-09-25 04:38:43,335 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 04:38:43,335 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 56 [2020-09-25 04:38:43,336 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 04:38:43,336 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 04:38:43,336 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 04:38:43,337 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 04:38:43,337 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 04:38:43,338 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 04:38:43,728 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 04:38:43,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2095546927] [2020-09-25 04:38:43,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 04:38:43,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-25 04:38:43,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939597571] [2020-09-25 04:38:43,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-25 04:38:43,731 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 04:38:43,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-25 04:38:43,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-25 04:38:43,732 INFO L87 Difference]: Start difference. First operand 2132 states and 2619 transitions. Second operand 5 states. [2020-09-25 04:38:50,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 04:38:50,405 INFO L93 Difference]: Finished difference Result 5887 states and 7288 transitions. [2020-09-25 04:38:50,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-25 04:38:50,406 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 456 [2020-09-25 04:38:50,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 04:38:50,424 INFO L225 Difference]: With dead ends: 5887 [2020-09-25 04:38:50,424 INFO L226 Difference]: Without dead ends: 3958 [2020-09-25 04:38:50,429 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-25 04:38:50,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3958 states. [2020-09-25 04:38:50,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3958 to 3827. [2020-09-25 04:38:50,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3827 states. [2020-09-25 04:38:50,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3827 states to 3827 states and 4733 transitions. [2020-09-25 04:38:50,551 INFO L78 Accepts]: Start accepts. Automaton has 3827 states and 4733 transitions. Word has length 456 [2020-09-25 04:38:50,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 04:38:50,552 INFO L479 AbstractCegarLoop]: Abstraction has 3827 states and 4733 transitions. [2020-09-25 04:38:50,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-25 04:38:50,552 INFO L276 IsEmpty]: Start isEmpty. Operand 3827 states and 4733 transitions. [2020-09-25 04:38:50,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 458 [2020-09-25 04:38:50,561 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 04:38:50,562 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] [2020-09-25 04:38:50,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-25 04:38:50,563 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr4ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr3ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 04:38:50,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 04:38:50,563 INFO L82 PathProgramCache]: Analyzing trace with hash 1610099519, now seen corresponding path program 1 times [2020-09-25 04:38:50,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 04:38:50,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856431161] [2020-09-25 04:38:50,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 04:38:50,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 04:38:50,705 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:50,838 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:50,999 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:51,188 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:51,307 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:51,425 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:51,715 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:53,716 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:55,637 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 04:38:55,637 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 464 [2020-09-25 04:38:55,637 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 04:38:55,637 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5001 [2020-09-25 04:38:55,638 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 04:38:55,638 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 04:38:55,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 04:38:55,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 187 [2020-09-25 04:38:55,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-09-25 04:38:55,639 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 04:38:56,060 WARN L193 SmtUtils]: Spent 319.00 ms on a formula simplification that was a NOOP. DAG size: 196 [2020-09-25 04:38:56,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 04:38:56,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 04:38:56,079 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 04:38:56,121 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 04:38:56,121 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 74 [2020-09-25 04:38:56,122 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 04:38:56,122 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 50 [2020-09-25 04:38:56,122 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 04:38:56,122 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 04:38:56,123 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 04:38:56,123 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 04:38:56,123 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 04:38:56,123 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 04:38:56,374 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 04:38:56,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856431161] [2020-09-25 04:38:56,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 04:38:56,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-25 04:38:56,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971056341] [2020-09-25 04:38:56,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-25 04:38:56,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 04:38:56,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-25 04:38:56,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 04:38:56,379 INFO L87 Difference]: Start difference. First operand 3827 states and 4733 transitions. Second operand 4 states.