./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-fpi/ms2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6c24879c Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/array-fpi/ms2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 125fe310e2ae1e5a109eb21d52d95bf156448ac6c5b2e6793bd0b6f80e48ce1d --- Real Ultimate output --- This is Ultimate 0.2.2-?-6c24879 [2022-07-11 23:23:05,861 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-11 23:23:05,863 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-11 23:23:05,879 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-11 23:23:05,880 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-11 23:23:05,880 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-11 23:23:05,881 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-11 23:23:05,882 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-11 23:23:05,883 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-11 23:23:05,884 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-11 23:23:05,884 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-11 23:23:05,885 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-11 23:23:05,885 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-11 23:23:05,886 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-11 23:23:05,886 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-11 23:23:05,887 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-11 23:23:05,888 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-11 23:23:05,888 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-11 23:23:05,889 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-11 23:23:05,891 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-11 23:23:05,891 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-11 23:23:05,892 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-11 23:23:05,893 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-11 23:23:05,894 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-11 23:23:05,894 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-11 23:23:05,896 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-11 23:23:05,896 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-11 23:23:05,897 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-11 23:23:05,897 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-11 23:23:05,898 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-11 23:23:05,898 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-11 23:23:05,899 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-11 23:23:05,899 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-11 23:23:05,900 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-11 23:23:05,900 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-11 23:23:05,901 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-11 23:23:05,901 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-11 23:23:05,901 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-11 23:23:05,902 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-11 23:23:05,902 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-11 23:23:05,902 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-11 23:23:05,903 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-11 23:23:05,903 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-11 23:23:05,915 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-11 23:23:05,916 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-11 23:23:05,916 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-11 23:23:05,916 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-11 23:23:05,917 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-11 23:23:05,917 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-11 23:23:05,917 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-11 23:23:05,917 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-11 23:23:05,917 INFO L138 SettingsManager]: * Use SBE=true [2022-07-11 23:23:05,918 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-11 23:23:05,918 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-11 23:23:05,918 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-11 23:23:05,918 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-11 23:23:05,918 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-11 23:23:05,918 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-11 23:23:05,918 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-11 23:23:05,918 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-11 23:23:05,919 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-11 23:23:05,919 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-11 23:23:05,919 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-11 23:23:05,919 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-11 23:23:05,919 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-11 23:23:05,919 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-11 23:23:05,919 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-11 23:23:05,920 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-11 23:23:05,920 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-11 23:23:05,920 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-11 23:23:05,920 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-11 23:23:05,920 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-11 23:23:05,920 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-11 23:23:05,920 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-11 23:23:05,921 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-11 23:23:05,921 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-11 23:23:05,921 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 125fe310e2ae1e5a109eb21d52d95bf156448ac6c5b2e6793bd0b6f80e48ce1d [2022-07-11 23:23:06,110 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-11 23:23:06,126 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-11 23:23:06,129 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-11 23:23:06,129 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-11 23:23:06,130 INFO L275 PluginConnector]: CDTParser initialized [2022-07-11 23:23:06,130 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/ms2.c [2022-07-11 23:23:06,176 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a97efd11b/9266680a992b464798b20352ea763195/FLAG4871bfa28 [2022-07-11 23:23:06,529 INFO L306 CDTParser]: Found 1 translation units. [2022-07-11 23:23:06,529 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ms2.c [2022-07-11 23:23:06,535 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a97efd11b/9266680a992b464798b20352ea763195/FLAG4871bfa28 [2022-07-11 23:23:06,548 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a97efd11b/9266680a992b464798b20352ea763195 [2022-07-11 23:23:06,550 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-11 23:23:06,551 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-11 23:23:06,553 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-11 23:23:06,553 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-11 23:23:06,555 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-11 23:23:06,555 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,556 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44ee73ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06, skipping insertion in model container [2022-07-11 23:23:06,556 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,561 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-11 23:23:06,571 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-11 23:23:06,691 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ms2.c[586,599] [2022-07-11 23:23:06,709 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-11 23:23:06,715 INFO L203 MainTranslator]: Completed pre-run [2022-07-11 23:23:06,727 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ms2.c[586,599] [2022-07-11 23:23:06,741 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-11 23:23:06,752 INFO L208 MainTranslator]: Completed translation [2022-07-11 23:23:06,752 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06 WrapperNode [2022-07-11 23:23:06,753 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-11 23:23:06,754 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-11 23:23:06,754 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-11 23:23:06,754 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-11 23:23:06,759 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,770 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,787 INFO L137 Inliner]: procedures = 17, calls = 25, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 70 [2022-07-11 23:23:06,787 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-11 23:23:06,788 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-11 23:23:06,788 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-11 23:23:06,788 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-11 23:23:06,794 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,794 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,797 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,797 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,809 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,812 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,818 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,822 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-11 23:23:06,823 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-11 23:23:06,823 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-11 23:23:06,823 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-11 23:23:06,824 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (1/1) ... [2022-07-11 23:23:06,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-11 23:23:06,836 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-11 23:23:06,847 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-11 23:23:06,849 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-11 23:23:06,872 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-11 23:23:06,872 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-11 23:23:06,872 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-11 23:23:06,873 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-07-11 23:23:06,873 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-11 23:23:06,873 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-11 23:23:06,873 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-11 23:23:06,873 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-07-11 23:23:06,873 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-11 23:23:06,922 INFO L234 CfgBuilder]: Building ICFG [2022-07-11 23:23:06,924 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-11 23:23:07,070 INFO L275 CfgBuilder]: Performing block encoding [2022-07-11 23:23:07,074 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-11 23:23:07,074 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-07-11 23:23:07,076 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.07 11:23:07 BoogieIcfgContainer [2022-07-11 23:23:07,078 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-11 23:23:07,080 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-11 23:23:07,080 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-11 23:23:07,082 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-11 23:23:07,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.07 11:23:06" (1/3) ... [2022-07-11 23:23:07,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3173362a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.07 11:23:07, skipping insertion in model container [2022-07-11 23:23:07,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.07 11:23:06" (2/3) ... [2022-07-11 23:23:07,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3173362a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.07 11:23:07, skipping insertion in model container [2022-07-11 23:23:07,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.07 11:23:07" (3/3) ... [2022-07-11 23:23:07,085 INFO L111 eAbstractionObserver]: Analyzing ICFG ms2.c [2022-07-11 23:23:07,094 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-11 23:23:07,094 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-11 23:23:07,124 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-11 23:23:07,129 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@151694f9, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@4cf018b [2022-07-11 23:23:07,129 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-07-11 23:23:07,141 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-11 23:23:07,146 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:23:07,153 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:23:07,154 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:23:07,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:23:07,158 INFO L85 PathProgramCache]: Analyzing trace with hash 356661439, now seen corresponding path program 1 times [2022-07-11 23:23:07,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:23:07,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142598775] [2022-07-11 23:23:07,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:23:07,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:23:07,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:23:07,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:07,259 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:23:07,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142598775] [2022-07-11 23:23:07,260 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142598775] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-11 23:23:07,260 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-11 23:23:07,260 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-11 23:23:07,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757616503] [2022-07-11 23:23:07,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-11 23:23:07,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-11 23:23:07,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-11 23:23:07,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-11 23:23:07,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-11 23:23:07,289 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-11 23:23:07,299 INFO L93 Difference]: Finished difference Result 34 states and 46 transitions. [2022-07-11 23:23:07,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-11 23:23:07,301 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-07-11 23:23:07,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-11 23:23:07,306 INFO L225 Difference]: With dead ends: 34 [2022-07-11 23:23:07,306 INFO L226 Difference]: Without dead ends: 15 [2022-07-11 23:23:07,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-11 23:23:07,315 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-11 23:23:07,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-11 23:23:07,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-07-11 23:23:07,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-07-11 23:23:07,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2022-07-11 23:23:07,340 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2022-07-11 23:23:07,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-11 23:23:07,341 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2022-07-11 23:23:07,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,342 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2022-07-11 23:23:07,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-11 23:23:07,343 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:23:07,343 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:23:07,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-11 23:23:07,343 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:23:07,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:23:07,346 INFO L85 PathProgramCache]: Analyzing trace with hash -452685187, now seen corresponding path program 1 times [2022-07-11 23:23:07,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:23:07,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315697009] [2022-07-11 23:23:07,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:23:07,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:23:07,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:23:07,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:07,442 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:23:07,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315697009] [2022-07-11 23:23:07,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315697009] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-11 23:23:07,442 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-11 23:23:07,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-11 23:23:07,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064059097] [2022-07-11 23:23:07,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-11 23:23:07,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-11 23:23:07,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-11 23:23:07,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-11 23:23:07,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-11 23:23:07,446 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-11 23:23:07,488 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2022-07-11 23:23:07,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-11 23:23:07,489 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-07-11 23:23:07,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-11 23:23:07,501 INFO L225 Difference]: With dead ends: 28 [2022-07-11 23:23:07,501 INFO L226 Difference]: Without dead ends: 20 [2022-07-11 23:23:07,502 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-11 23:23:07,502 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 19 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-11 23:23:07,503 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 11 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-11 23:23:07,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-07-11 23:23:07,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2022-07-11 23:23:07,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2022-07-11 23:23:07,507 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 11 [2022-07-11 23:23:07,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-11 23:23:07,507 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2022-07-11 23:23:07,507 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,507 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2022-07-11 23:23:07,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-07-11 23:23:07,508 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:23:07,508 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:23:07,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-11 23:23:07,508 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:23:07,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:23:07,509 INFO L85 PathProgramCache]: Analyzing trace with hash 623611495, now seen corresponding path program 1 times [2022-07-11 23:23:07,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:23:07,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655525503] [2022-07-11 23:23:07,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:23:07,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:23:07,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:23:07,579 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-11 23:23:07,579 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:23:07,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655525503] [2022-07-11 23:23:07,580 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655525503] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-11 23:23:07,580 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-11 23:23:07,580 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-11 23:23:07,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128237380] [2022-07-11 23:23:07,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-11 23:23:07,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-11 23:23:07,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-11 23:23:07,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-11 23:23:07,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-07-11 23:23:07,582 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-11 23:23:07,610 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-07-11 23:23:07,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-11 23:23:07,610 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-07-11 23:23:07,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-11 23:23:07,611 INFO L225 Difference]: With dead ends: 25 [2022-07-11 23:23:07,611 INFO L226 Difference]: Without dead ends: 21 [2022-07-11 23:23:07,611 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-07-11 23:23:07,612 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 11 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-11 23:23:07,612 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 25 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-11 23:23:07,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-07-11 23:23:07,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-07-11 23:23:07,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-07-11 23:23:07,615 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 16 [2022-07-11 23:23:07,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-11 23:23:07,616 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-07-11 23:23:07,616 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,616 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-07-11 23:23:07,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-07-11 23:23:07,617 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:23:07,617 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:23:07,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-07-11 23:23:07,617 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:23:07,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:23:07,618 INFO L85 PathProgramCache]: Analyzing trace with hash -422196611, now seen corresponding path program 1 times [2022-07-11 23:23:07,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:23:07,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215231529] [2022-07-11 23:23:07,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:23:07,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:23:07,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:23:07,700 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:07,700 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:23:07,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215231529] [2022-07-11 23:23:07,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215231529] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-11 23:23:07,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974742342] [2022-07-11 23:23:07,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:23:07,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:23:07,701 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-11 23:23:07,703 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-11 23:23:07,704 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-11 23:23:07,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:23:07,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-11 23:23:07,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-11 23:23:07,808 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:07,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-11 23:23:07,841 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:07,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974742342] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-11 23:23:07,841 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-11 23:23:07,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2022-07-11 23:23:07,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444614769] [2022-07-11 23:23:07,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-11 23:23:07,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-07-11 23:23:07,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-11 23:23:07,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-07-11 23:23:07,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-07-11 23:23:07,843 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-11 23:23:07,920 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2022-07-11 23:23:07,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-11 23:23:07,921 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-07-11 23:23:07,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-11 23:23:07,921 INFO L225 Difference]: With dead ends: 39 [2022-07-11 23:23:07,921 INFO L226 Difference]: Without dead ends: 25 [2022-07-11 23:23:07,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2022-07-11 23:23:07,923 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 24 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-11 23:23:07,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 22 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-11 23:23:07,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-07-11 23:23:07,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2022-07-11 23:23:07,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-07-11 23:23:07,932 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2022-07-11 23:23:07,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-11 23:23:07,932 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-07-11 23:23:07,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:07,932 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-07-11 23:23:07,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-07-11 23:23:07,934 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:23:07,934 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:23:07,951 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-11 23:23:08,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:23:08,148 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:23:08,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:23:08,148 INFO L85 PathProgramCache]: Analyzing trace with hash 692240447, now seen corresponding path program 2 times [2022-07-11 23:23:08,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:23:08,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993872864] [2022-07-11 23:23:08,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:23:08,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:23:08,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:23:08,587 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:08,587 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:23:08,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993872864] [2022-07-11 23:23:08,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993872864] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-11 23:23:08,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048460751] [2022-07-11 23:23:08,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-11 23:23:08,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:23:08,589 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-11 23:23:08,590 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-11 23:23:08,594 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-11 23:23:08,637 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-11 23:23:08,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-11 23:23:08,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 23 conjunts are in the unsatisfiable core [2022-07-11 23:23:08,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-11 23:23:08,796 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-07-11 23:23:09,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:23:09,003 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2022-07-11 23:23:09,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:23:09,696 INFO L356 Elim1Store]: treesize reduction 18, result has 5.3 percent of original size [2022-07-11 23:23:09,696 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 44 [2022-07-11 23:23:11,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:23:11,904 INFO L356 Elim1Store]: treesize reduction 16, result has 15.8 percent of original size [2022-07-11 23:23:11,904 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 13 [2022-07-11 23:23:11,932 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:11,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-11 23:23:16,041 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 98 [2022-07-11 23:23:16,144 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:16,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048460751] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-11 23:23:16,145 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-11 23:23:16,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 12] total 33 [2022-07-11 23:23:16,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818653185] [2022-07-11 23:23:16,146 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-11 23:23:16,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-07-11 23:23:16,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-11 23:23:16,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-07-11 23:23:16,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=880, Unknown=4, NotChecked=0, Total=1056 [2022-07-11 23:23:16,149 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 33 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:16,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-11 23:23:16,529 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2022-07-11 23:23:16,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-11 23:23:16,530 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 33 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-07-11 23:23:16,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-11 23:23:16,532 INFO L225 Difference]: With dead ends: 39 [2022-07-11 23:23:16,532 INFO L226 Difference]: Without dead ends: 35 [2022-07-11 23:23:16,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=306, Invalid=1496, Unknown=4, NotChecked=0, Total=1806 [2022-07-11 23:23:16,536 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-11 23:23:16,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 58 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 69 Invalid, 0 Unknown, 47 Unchecked, 0.0s Time] [2022-07-11 23:23:16,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-07-11 23:23:16,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 25. [2022-07-11 23:23:16,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:16,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-07-11 23:23:16,547 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 21 [2022-07-11 23:23:16,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-11 23:23:16,547 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-07-11 23:23:16,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 33 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:16,548 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-07-11 23:23:16,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-11 23:23:16,549 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:23:16,549 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:23:16,568 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-11 23:23:16,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:23:16,755 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:23:16,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:23:16,756 INFO L85 PathProgramCache]: Analyzing trace with hash -981578845, now seen corresponding path program 3 times [2022-07-11 23:23:16,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:23:16,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224200639] [2022-07-11 23:23:16,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:23:16,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:23:16,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:23:16,785 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-11 23:23:16,800 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:23:16,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224200639] [2022-07-11 23:23:16,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224200639] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-11 23:23:16,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363865171] [2022-07-11 23:23:16,801 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-11 23:23:16,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:23:16,801 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-11 23:23:16,802 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-11 23:23:16,803 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-11 23:23:16,851 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-11 23:23:16,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-11 23:23:16,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-11 23:23:16,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-11 23:23:16,910 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:16,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-11 23:23:16,948 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:16,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363865171] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-11 23:23:16,949 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-11 23:23:16,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 9, 9] total 14 [2022-07-11 23:23:16,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305304569] [2022-07-11 23:23:16,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-11 23:23:16,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-07-11 23:23:16,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-11 23:23:16,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-07-11 23:23:16,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2022-07-11 23:23:16,951 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:17,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-11 23:23:17,085 INFO L93 Difference]: Finished difference Result 47 states and 54 transitions. [2022-07-11 23:23:17,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-07-11 23:23:17,086 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-07-11 23:23:17,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-11 23:23:17,087 INFO L225 Difference]: With dead ends: 47 [2022-07-11 23:23:17,088 INFO L226 Difference]: Without dead ends: 30 [2022-07-11 23:23:17,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2022-07-11 23:23:17,092 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 50 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-11 23:23:17,092 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 26 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-11 23:23:17,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-07-11 23:23:17,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2022-07-11 23:23:17,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:17,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-07-11 23:23:17,098 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2022-07-11 23:23:17,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-11 23:23:17,098 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-07-11 23:23:17,098 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:23:17,098 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-07-11 23:23:17,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-07-11 23:23:17,099 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:23:17,099 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:23:17,116 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-11 23:23:17,299 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:23:17,300 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:23:17,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:23:17,300 INFO L85 PathProgramCache]: Analyzing trace with hash -1384678109, now seen corresponding path program 4 times [2022-07-11 23:23:17,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:23:17,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623187396] [2022-07-11 23:23:17,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:23:17,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:23:17,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:23:17,769 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:17,769 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:23:17,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623187396] [2022-07-11 23:23:17,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623187396] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-11 23:23:17,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361136918] [2022-07-11 23:23:17,769 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-11 23:23:17,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:23:17,769 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-11 23:23:17,771 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-11 23:23:17,772 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-11 23:23:17,810 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-11 23:23:17,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-11 23:23:17,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 34 conjunts are in the unsatisfiable core [2022-07-11 23:23:17,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-11 23:23:17,851 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-07-11 23:23:17,908 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-07-11 23:23:17,908 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2022-07-11 23:23:18,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:23:18,017 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-07-11 23:23:18,017 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2022-07-11 23:23:18,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:23:18,105 INFO L356 Elim1Store]: treesize reduction 40, result has 2.4 percent of original size [2022-07-11 23:23:18,105 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 51 [2022-07-11 23:23:18,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:23:18,194 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-07-11 23:23:18,195 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 40 [2022-07-11 23:23:18,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:23:18,280 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-07-11 23:23:18,280 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 47 treesize of output 15 [2022-07-11 23:23:18,305 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:23:18,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-11 23:24:00,054 WARN L233 SmtUtils]: Spent 32.00s on a formula simplification. DAG size of input: 56 DAG size of output: 43 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-11 23:24:09,382 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-07-11 23:24:09,382 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 914 treesize of output 890 [2022-07-11 23:24:09,948 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:24:09,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361136918] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-11 23:24:09,948 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-11 23:24:09,948 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14, 14] total 40 [2022-07-11 23:24:09,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77734134] [2022-07-11 23:24:09,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-11 23:24:09,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-07-11 23:24:09,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-11 23:24:09,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-07-11 23:24:09,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1368, Unknown=8, NotChecked=0, Total=1560 [2022-07-11 23:24:09,950 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 40 states, 40 states have (on average 1.675) internal successors, (67), 40 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:24:10,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-11 23:24:10,848 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2022-07-11 23:24:10,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-07-11 23:24:10,848 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 40 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-07-11 23:24:10,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-11 23:24:10,849 INFO L225 Difference]: With dead ends: 36 [2022-07-11 23:24:10,849 INFO L226 Difference]: Without dead ends: 32 [2022-07-11 23:24:10,850 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 52.1s TimeCoverageRelationStatistics Valid=379, Invalid=2475, Unknown=8, NotChecked=0, Total=2862 [2022-07-11 23:24:10,850 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 33 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 111 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-11 23:24:10,851 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 103 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 292 Invalid, 0 Unknown, 111 Unchecked, 0.2s Time] [2022-07-11 23:24:10,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-07-11 23:24:10,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2022-07-11 23:24:10,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:24:10,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-07-11 23:24:10,854 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2022-07-11 23:24:10,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-11 23:24:10,854 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-07-11 23:24:10,855 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 40 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:24:10,855 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-07-11 23:24:10,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-11 23:24:10,855 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:24:10,855 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:24:10,874 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-11 23:24:11,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:24:11,072 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:24:11,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:24:11,072 INFO L85 PathProgramCache]: Analyzing trace with hash -483356095, now seen corresponding path program 5 times [2022-07-11 23:24:11,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:24:11,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392576697] [2022-07-11 23:24:11,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:24:11,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:24:11,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:24:11,151 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 15 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:24:11,151 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:24:11,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392576697] [2022-07-11 23:24:11,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392576697] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-11 23:24:11,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431924919] [2022-07-11 23:24:11,152 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-11 23:24:11,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:24:11,152 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-11 23:24:11,153 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-11 23:24:11,153 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-11 23:24:11,208 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2022-07-11 23:24:11,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-11 23:24:11,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 10 conjunts are in the unsatisfiable core [2022-07-11 23:24:11,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-11 23:24:11,292 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 22 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:24:11,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-11 23:24:11,326 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 17 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:24:11,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431924919] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-11 23:24:11,327 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-11 23:24:11,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-07-11 23:24:11,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716309027] [2022-07-11 23:24:11,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-11 23:24:11,328 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-07-11 23:24:11,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-11 23:24:11,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-07-11 23:24:11,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2022-07-11 23:24:11,329 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 17 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:24:11,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-11 23:24:11,457 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2022-07-11 23:24:11,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-07-11 23:24:11,458 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 17 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-07-11 23:24:11,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-11 23:24:11,459 INFO L225 Difference]: With dead ends: 53 [2022-07-11 23:24:11,459 INFO L226 Difference]: Without dead ends: 35 [2022-07-11 23:24:11,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=117, Invalid=303, Unknown=0, NotChecked=0, Total=420 [2022-07-11 23:24:11,460 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 39 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-11 23:24:11,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 37 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-11 23:24:11,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-07-11 23:24:11,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2022-07-11 23:24:11,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:24:11,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-07-11 23:24:11,468 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 29 [2022-07-11 23:24:11,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-11 23:24:11,469 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-07-11 23:24:11,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 17 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:24:11,470 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-07-11 23:24:11,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-11 23:24:11,470 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:24:11,470 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:24:11,486 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-07-11 23:24:11,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:24:11,673 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:24:11,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:24:11,673 INFO L85 PathProgramCache]: Analyzing trace with hash -1023492733, now seen corresponding path program 6 times [2022-07-11 23:24:11,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:24:11,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957751368] [2022-07-11 23:24:11,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:24:11,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:24:11,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:24:12,213 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:24:12,214 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:24:12,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957751368] [2022-07-11 23:24:12,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957751368] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-11 23:24:12,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025247276] [2022-07-11 23:24:12,214 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-11 23:24:12,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:24:12,215 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-11 23:24:12,216 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-11 23:24:12,217 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-11 23:24:12,281 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-07-11 23:24:12,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-11 23:24:12,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 52 conjunts are in the unsatisfiable core [2022-07-11 23:24:12,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-11 23:24:12,294 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-11 23:24:12,315 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-07-11 23:24:12,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:12,375 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-07-11 23:24:12,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:12,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:12,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:12,470 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 43 [2022-07-11 23:24:12,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:12,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:12,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:12,837 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 75 [2022-07-11 23:24:13,136 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-11 23:24:13,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,140 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 87 [2022-07-11 23:24:13,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,474 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-11 23:24:13,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,476 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 102 treesize of output 85 [2022-07-11 23:24:13,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,840 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-11 23:24:13,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:13,842 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 108 treesize of output 83 [2022-07-11 23:24:14,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:14,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:14,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:24:14,022 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 34 [2022-07-11 23:24:14,081 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:24:14,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-11 23:24:34,666 INFO L356 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-07-11 23:24:34,667 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 6488 treesize of output 6404 [2022-07-11 23:27:03,742 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:27:03,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025247276] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-11 23:27:03,743 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-11 23:27:03,743 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 23, 21] total 55 [2022-07-11 23:27:03,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064679967] [2022-07-11 23:27:03,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-11 23:27:03,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-07-11 23:27:03,743 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-11 23:27:03,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-07-11 23:27:03,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=2487, Unknown=5, NotChecked=0, Total=2970 [2022-07-11 23:27:03,745 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 55 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 55 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:27:05,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-11 23:27:05,033 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2022-07-11 23:27:05,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-07-11 23:27:05,034 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 55 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-07-11 23:27:05,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-11 23:27:05,034 INFO L225 Difference]: With dead ends: 74 [2022-07-11 23:27:05,034 INFO L226 Difference]: Without dead ends: 69 [2022-07-11 23:27:05,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 22 SyntacticMatches, 5 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1759 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=849, Invalid=4402, Unknown=5, NotChecked=0, Total=5256 [2022-07-11 23:27:05,036 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 9 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 187 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-11 23:27:05,036 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 91 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 160 Invalid, 0 Unknown, 187 Unchecked, 0.1s Time] [2022-07-11 23:27:05,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-07-11 23:27:05,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 53. [2022-07-11 23:27:05,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 52 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:27:05,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2022-07-11 23:27:05,044 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 31 [2022-07-11 23:27:05,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-11 23:27:05,044 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2022-07-11 23:27:05,044 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 55 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-11 23:27:05,044 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2022-07-11 23:27:05,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-07-11 23:27:05,045 INFO L187 NwaCegarLoop]: Found error trace [2022-07-11 23:27:05,045 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-11 23:27:05,060 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-07-11 23:27:05,245 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:27:05,245 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-11 23:27:05,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-11 23:27:05,246 INFO L85 PathProgramCache]: Analyzing trace with hash -880704545, now seen corresponding path program 7 times [2022-07-11 23:27:05,246 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-11 23:27:05,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399033360] [2022-07-11 23:27:05,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-11 23:27:05,246 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-11 23:27:05,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:27:06,281 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:27:06,282 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-11 23:27:06,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399033360] [2022-07-11 23:27:06,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [399033360] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-11 23:27:06,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862288079] [2022-07-11 23:27:06,282 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-11 23:27:06,282 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-11 23:27:06,282 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-11 23:27:06,284 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-11 23:27:06,285 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-11 23:27:06,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-11 23:27:06,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 58 conjunts are in the unsatisfiable core [2022-07-11 23:27:06,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-11 23:27:06,346 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-11 23:27:06,372 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-07-11 23:27:06,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,473 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2022-07-11 23:27:06,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,605 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 48 [2022-07-11 23:27:06,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,747 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 58 [2022-07-11 23:27:06,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:06,927 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 68 [2022-07-11 23:27:07,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,081 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-11 23:27:07,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,084 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 84 treesize of output 75 [2022-07-11 23:27:07,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,250 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-11 23:27:07,251 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 72 [2022-07-11 23:27:07,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,446 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-11 23:27:07,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,447 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 72 [2022-07-11 23:27:07,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,622 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-11 23:27:07,623 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 67 [2022-07-11 23:27:07,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-11 23:27:07,752 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 23 [2022-07-11 23:27:07,796 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-11 23:27:07,797 INFO L328 TraceCheckSpWp]: Computing backward predicates...