./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) 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/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 60396cce4fa0936fb91e88a54a287214045469c9d9b3d447954681e0a5aabbc0 --- Real Ultimate output --- This is Ultimate 0.2.2-?-6c24879 [2022-07-12 18:26:32,776 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-12 18:26:32,778 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-12 18:26:32,829 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-12 18:26:32,830 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-12 18:26:32,831 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-12 18:26:32,833 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-12 18:26:32,836 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-12 18:26:32,838 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-12 18:26:32,842 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-12 18:26:32,844 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-12 18:26:32,846 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-12 18:26:32,846 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-12 18:26:32,848 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-12 18:26:32,849 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-12 18:26:32,853 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-12 18:26:32,854 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-12 18:26:32,856 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-12 18:26:32,857 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-12 18:26:32,863 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-12 18:26:32,866 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-12 18:26:32,867 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-12 18:26:32,868 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-12 18:26:32,869 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-12 18:26:32,870 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-12 18:26:32,873 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-12 18:26:32,874 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-12 18:26:32,874 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-12 18:26:32,875 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-12 18:26:32,876 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-12 18:26:32,877 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-12 18:26:32,877 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-12 18:26:32,879 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-12 18:26:32,879 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-12 18:26:32,880 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-12 18:26:32,881 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-12 18:26:32,881 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-12 18:26:32,881 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-12 18:26:32,882 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-12 18:26:32,882 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-12 18:26:32,883 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-12 18:26:32,884 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-12 18:26:32,886 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2022-07-12 18:26:32,915 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-12 18:26:32,916 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-12 18:26:32,916 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-12 18:26:32,916 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-12 18:26:32,917 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-12 18:26:32,917 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-12 18:26:32,918 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-12 18:26:32,918 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-12 18:26:32,918 INFO L138 SettingsManager]: * Use SBE=true [2022-07-12 18:26:32,919 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-12 18:26:32,919 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-12 18:26:32,920 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-12 18:26:32,920 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-12 18:26:32,920 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-12 18:26:32,920 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-12 18:26:32,920 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-12 18:26:32,920 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-12 18:26:32,921 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-07-12 18:26:32,921 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-12 18:26:32,922 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-12 18:26:32,922 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-12 18:26:32,922 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-12 18:26:32,923 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-12 18:26:32,923 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-12 18:26:32,923 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-12 18:26:32,923 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-12 18:26:32,924 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-12 18:26:32,924 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-12 18:26:32,924 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-12 18:26:32,924 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-12 18:26:32,924 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 60396cce4fa0936fb91e88a54a287214045469c9d9b3d447954681e0a5aabbc0 [2022-07-12 18:26:33,192 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-12 18:26:33,210 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-12 18:26:33,213 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-12 18:26:33,214 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-12 18:26:33,214 INFO L275 PluginConnector]: CDTParser initialized [2022-07-12 18:26:33,215 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2022-07-12 18:26:33,285 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0902e038f/c42d9354694f4c4db72aa66e95b51944/FLAGfb64bc815 [2022-07-12 18:26:33,791 INFO L306 CDTParser]: Found 1 translation units. [2022-07-12 18:26:33,791 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2022-07-12 18:26:33,807 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0902e038f/c42d9354694f4c4db72aa66e95b51944/FLAGfb64bc815 [2022-07-12 18:26:34,305 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0902e038f/c42d9354694f4c4db72aa66e95b51944 [2022-07-12 18:26:34,308 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-12 18:26:34,309 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-12 18:26:34,311 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-12 18:26:34,312 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-12 18:26:34,321 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-12 18:26:34,321 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,322 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@178ea35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34, skipping insertion in model container [2022-07-12 18:26:34,323 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,341 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-12 18:26:34,379 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-12 18:26:34,590 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-12 18:26:34,597 INFO L203 MainTranslator]: Completed pre-run [2022-07-12 18:26:34,628 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-12 18:26:34,648 INFO L208 MainTranslator]: Completed translation [2022-07-12 18:26:34,649 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34 WrapperNode [2022-07-12 18:26:34,649 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-12 18:26:34,650 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-12 18:26:34,650 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-12 18:26:34,650 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-12 18:26:34,657 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,667 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,686 INFO L137 Inliner]: procedures = 117, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 29 [2022-07-12 18:26:34,687 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-12 18:26:34,688 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-12 18:26:34,689 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-12 18:26:34,689 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-12 18:26:34,695 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,696 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,709 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,710 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,713 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,717 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,718 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,719 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-12 18:26:34,720 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-12 18:26:34,720 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-12 18:26:34,720 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-12 18:26:34,721 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (1/1) ... [2022-07-12 18:26:34,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-12 18:26:34,742 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:34,752 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) [2022-07-12 18:26:34,759 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 [2022-07-12 18:26:34,793 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-07-12 18:26:34,793 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-07-12 18:26:34,794 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-12 18:26:34,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-12 18:26:34,795 INFO L130 BoogieDeclarations]: Found specification of procedure strlen_rec [2022-07-12 18:26:34,795 INFO L138 BoogieDeclarations]: Found implementation of procedure strlen_rec [2022-07-12 18:26:34,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-12 18:26:34,795 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-12 18:26:34,870 INFO L234 CfgBuilder]: Building ICFG [2022-07-12 18:26:34,872 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-12 18:26:34,990 INFO L275 CfgBuilder]: Performing block encoding [2022-07-12 18:26:34,995 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-12 18:26:34,995 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-07-12 18:26:34,997 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.07 06:26:34 BoogieIcfgContainer [2022-07-12 18:26:34,997 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-12 18:26:34,999 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-12 18:26:34,999 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-12 18:26:35,013 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-12 18:26:35,014 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.07 06:26:34" (1/3) ... [2022-07-12 18:26:35,015 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51bcb358 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.07 06:26:35, skipping insertion in model container [2022-07-12 18:26:35,015 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:26:34" (2/3) ... [2022-07-12 18:26:35,015 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51bcb358 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.07 06:26:35, skipping insertion in model container [2022-07-12 18:26:35,015 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.07 06:26:34" (3/3) ... [2022-07-12 18:26:35,016 INFO L111 eAbstractionObserver]: Analyzing ICFG rec_strlen-alloca-1.i [2022-07-12 18:26:35,041 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-12 18:26:35,041 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 7 error locations. [2022-07-12 18:26:35,105 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 18:26:35,112 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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@f1fd71e, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@6ab65b05 [2022-07-12 18:26:35,113 INFO L358 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2022-07-12 18:26:35,139 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-12 18:26:35,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-12 18:26:35,158 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:35,158 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-12 18:26:35,159 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:35,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:35,165 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2022-07-12 18:26:35,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:35,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93794965] [2022-07-12 18:26:35,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:35,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:35,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:35,377 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:35,378 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:35,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93794965] [2022-07-12 18:26:35,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93794965] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 18:26:35,379 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 18:26:35,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-12 18:26:35,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118509148] [2022-07-12 18:26:35,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 18:26:35,386 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-12 18:26:35,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:35,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-12 18:26:35,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-12 18:26:35,417 INFO L87 Difference]: Start difference. First operand has 28 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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) [2022-07-12 18:26:35,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:35,485 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2022-07-12 18:26:35,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-12 18:26:35,487 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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 6 [2022-07-12 18:26:35,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:35,497 INFO L225 Difference]: With dead ends: 39 [2022-07-12 18:26:35,498 INFO L226 Difference]: Without dead ends: 35 [2022-07-12 18:26:35,501 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 [2022-07-12 18:26:35,505 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 9 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:35,506 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 71 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-12 18:26:35,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-07-12 18:26:35,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2022-07-12 18:26:35,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.5) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-12 18:26:35,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-07-12 18:26:35,535 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 6 [2022-07-12 18:26:35,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:35,535 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-07-12 18:26:35,535 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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) [2022-07-12 18:26:35,536 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-07-12 18:26:35,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-12 18:26:35,536 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:35,537 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-12 18:26:35,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-12 18:26:35,537 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:35,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:35,538 INFO L85 PathProgramCache]: Analyzing trace with hash 889508820, now seen corresponding path program 1 times [2022-07-12 18:26:35,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:35,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256816020] [2022-07-12 18:26:35,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:35,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:35,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:35,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:35,567 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:35,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256816020] [2022-07-12 18:26:35,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256816020] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 18:26:35,568 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 18:26:35,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-12 18:26:35,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852142004] [2022-07-12 18:26:35,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 18:26:35,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 18:26:35,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:35,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 18:26:35,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 18:26:35,571 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-12 18:26:35,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:35,589 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2022-07-12 18:26:35,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 18:26:35,589 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2022-07-12 18:26:35,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:35,590 INFO L225 Difference]: With dead ends: 26 [2022-07-12 18:26:35,590 INFO L226 Difference]: Without dead ends: 26 [2022-07-12 18:26:35,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 18:26:35,592 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 7 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:35,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 32 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-12 18:26:35,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-07-12 18:26:35,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-07-12 18:26:35,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 22 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-12 18:26:35,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-07-12 18:26:35,597 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 6 [2022-07-12 18:26:35,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:35,597 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-07-12 18:26:35,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-12 18:26:35,598 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-07-12 18:26:35,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-12 18:26:35,598 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:35,598 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-12 18:26:35,599 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-12 18:26:35,599 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:35,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:35,600 INFO L85 PathProgramCache]: Analyzing trace with hash 889508821, now seen corresponding path program 1 times [2022-07-12 18:26:35,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:35,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322524478] [2022-07-12 18:26:35,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:35,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:35,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:35,643 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:35,644 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:35,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322524478] [2022-07-12 18:26:35,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322524478] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 18:26:35,644 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 18:26:35,645 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 18:26:35,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437257783] [2022-07-12 18:26:35,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 18:26:35,645 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-12 18:26:35,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:35,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-12 18:26:35,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-12 18:26:35,647 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 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) [2022-07-12 18:26:35,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:35,665 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-07-12 18:26:35,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-12 18:26:35,666 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 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 6 [2022-07-12 18:26:35,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:35,667 INFO L225 Difference]: With dead ends: 25 [2022-07-12 18:26:35,667 INFO L226 Difference]: Without dead ends: 25 [2022-07-12 18:26:35,667 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-12 18:26:35,668 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 10 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:35,669 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 40 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-12 18:26:35,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-07-12 18:26:35,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-07-12 18:26:35,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 21 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-12 18:26:35,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-07-12 18:26:35,673 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 6 [2022-07-12 18:26:35,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:35,673 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-07-12 18:26:35,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 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) [2022-07-12 18:26:35,673 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-07-12 18:26:35,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-12 18:26:35,674 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:35,674 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-12 18:26:35,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-07-12 18:26:35,675 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:35,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:35,675 INFO L85 PathProgramCache]: Analyzing trace with hash 889568456, now seen corresponding path program 1 times [2022-07-12 18:26:35,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:35,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973856398] [2022-07-12 18:26:35,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:35,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:35,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:35,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:35,716 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:35,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973856398] [2022-07-12 18:26:35,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973856398] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 18:26:35,717 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 18:26:35,717 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 18:26:35,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889415958] [2022-07-12 18:26:35,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 18:26:35,718 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-12 18:26:35,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:35,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-12 18:26:35,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-12 18:26:35,738 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 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) [2022-07-12 18:26:35,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:35,773 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-07-12 18:26:35,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-12 18:26:35,774 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 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 6 [2022-07-12 18:26:35,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:35,775 INFO L225 Difference]: With dead ends: 34 [2022-07-12 18:26:35,775 INFO L226 Difference]: Without dead ends: 34 [2022-07-12 18:26:35,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-07-12 18:26:35,777 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 23 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:35,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 47 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-12 18:26:35,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-07-12 18:26:35,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2022-07-12 18:26:35,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.35) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-12 18:26:35,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2022-07-12 18:26:35,782 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 6 [2022-07-12 18:26:35,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:35,782 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2022-07-12 18:26:35,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 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) [2022-07-12 18:26:35,783 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2022-07-12 18:26:35,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-07-12 18:26:35,783 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:35,783 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:35,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-07-12 18:26:35,784 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting strlen_recErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:35,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:35,784 INFO L85 PathProgramCache]: Analyzing trace with hash -590943170, now seen corresponding path program 1 times [2022-07-12 18:26:35,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:35,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042603554] [2022-07-12 18:26:35,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:35,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:35,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:35,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:35,822 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:35,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042603554] [2022-07-12 18:26:35,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2042603554] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 18:26:35,823 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 18:26:35,823 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-12 18:26:35,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749159803] [2022-07-12 18:26:35,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 18:26:35,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-12 18:26:35,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:35,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-12 18:26:35,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-12 18:26:35,825 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 5 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:35,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:35,861 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2022-07-12 18:26:35,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-12 18:26:35,861 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-07-12 18:26:35,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:35,862 INFO L225 Difference]: With dead ends: 26 [2022-07-12 18:26:35,862 INFO L226 Difference]: Without dead ends: 26 [2022-07-12 18:26:35,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-07-12 18:26:35,864 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 19 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:35,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 34 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-12 18:26:35,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-07-12 18:26:35,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-07-12 18:26:35,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.3) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-12 18:26:35,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2022-07-12 18:26:35,867 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 9 [2022-07-12 18:26:35,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:35,868 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2022-07-12 18:26:35,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:35,868 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2022-07-12 18:26:35,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-07-12 18:26:35,868 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:35,869 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:35,869 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-07-12 18:26:35,869 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:35,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:35,870 INFO L85 PathProgramCache]: Analyzing trace with hash -590943169, now seen corresponding path program 1 times [2022-07-12 18:26:35,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:35,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720451894] [2022-07-12 18:26:35,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:35,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:35,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:35,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:35,931 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:35,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720451894] [2022-07-12 18:26:35,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720451894] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 18:26:35,932 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 18:26:35,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-12 18:26:35,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278863575] [2022-07-12 18:26:35,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 18:26:35,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-12 18:26:35,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:35,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-12 18:26:35,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-07-12 18:26:35,934 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:35,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:35,987 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2022-07-12 18:26:35,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-12 18:26:35,987 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-07-12 18:26:35,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:35,988 INFO L225 Difference]: With dead ends: 33 [2022-07-12 18:26:35,988 INFO L226 Difference]: Without dead ends: 33 [2022-07-12 18:26:35,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-07-12 18:26:35,990 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 28 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:35,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 59 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-12 18:26:35,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-07-12 18:26:35,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-07-12 18:26:36,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.28) internal successors, (32), 27 states have internal predecessors, (32), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-12 18:26:36,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2022-07-12 18:26:36,002 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 9 [2022-07-12 18:26:36,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:36,002 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2022-07-12 18:26:36,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:36,002 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2022-07-12 18:26:36,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-12 18:26:36,003 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:36,003 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:36,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-07-12 18:26:36,004 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:36,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:36,004 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2022-07-12 18:26:36,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:36,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226883429] [2022-07-12 18:26:36,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:36,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:36,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:36,103 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:36,103 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:36,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226883429] [2022-07-12 18:26:36,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226883429] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:36,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298383923] [2022-07-12 18:26:36,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:36,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:36,104 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:36,106 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) [2022-07-12 18:26:36,115 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-12 18:26:36,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:36,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 12 conjunts are in the unsatisfiable core [2022-07-12 18:26:36,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:36,271 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:26:36,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:36,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:36,557 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:36,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298383923] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:36,558 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:36,558 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2022-07-12 18:26:36,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234017720] [2022-07-12 18:26:36,566 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:36,567 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 18:26:36,567 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:36,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 18:26:36,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2022-07-12 18:26:36,570 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 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) [2022-07-12 18:26:36,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:36,720 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2022-07-12 18:26:36,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-12 18:26:36,721 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 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 10 [2022-07-12 18:26:36,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:36,724 INFO L225 Difference]: With dead ends: 45 [2022-07-12 18:26:36,724 INFO L226 Difference]: Without dead ends: 45 [2022-07-12 18:26:36,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2022-07-12 18:26:36,731 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 34 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:36,733 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 84 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-12 18:26:36,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-07-12 18:26:36,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 30. [2022-07-12 18:26:36,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-12 18:26:36,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-07-12 18:26:36,740 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 10 [2022-07-12 18:26:36,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:36,741 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-07-12 18:26:36,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 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) [2022-07-12 18:26:36,741 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-07-12 18:26:36,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-12 18:26:36,742 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:36,742 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:36,771 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:36,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:36,968 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:36,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:36,969 INFO L85 PathProgramCache]: Analyzing trace with hash 182504998, now seen corresponding path program 1 times [2022-07-12 18:26:36,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:36,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563008573] [2022-07-12 18:26:36,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:36,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:36,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:37,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:37,091 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:37,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563008573] [2022-07-12 18:26:37,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563008573] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 18:26:37,091 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 18:26:37,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-07-12 18:26:37,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479671989] [2022-07-12 18:26:37,092 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 18:26:37,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-12 18:26:37,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:37,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-12 18:26:37,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-07-12 18:26:37,101 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:37,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:37,196 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2022-07-12 18:26:37,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-12 18:26:37,196 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-07-12 18:26:37,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:37,198 INFO L225 Difference]: With dead ends: 40 [2022-07-12 18:26:37,198 INFO L226 Difference]: Without dead ends: 40 [2022-07-12 18:26:37,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2022-07-12 18:26:37,199 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:37,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 93 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-12 18:26:37,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-07-12 18:26:37,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2022-07-12 18:26:37,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 30 states have internal predecessors, (33), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-07-12 18:26:37,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2022-07-12 18:26:37,216 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 13 [2022-07-12 18:26:37,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:37,217 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2022-07-12 18:26:37,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:37,217 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2022-07-12 18:26:37,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-12 18:26:37,218 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:37,218 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:37,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-07-12 18:26:37,219 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:37,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:37,220 INFO L85 PathProgramCache]: Analyzing trace with hash 883569576, now seen corresponding path program 1 times [2022-07-12 18:26:37,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:37,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178501862] [2022-07-12 18:26:37,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:37,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:37,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:37,362 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:37,362 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:37,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178501862] [2022-07-12 18:26:37,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178501862] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 18:26:37,363 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 18:26:37,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-07-12 18:26:37,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545791177] [2022-07-12 18:26:37,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 18:26:37,364 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-12 18:26:37,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:37,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-12 18:26:37,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-07-12 18:26:37,365 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:37,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:37,497 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2022-07-12 18:26:37,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 18:26:37,498 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-07-12 18:26:37,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:37,501 INFO L225 Difference]: With dead ends: 51 [2022-07-12 18:26:37,501 INFO L226 Difference]: Without dead ends: 51 [2022-07-12 18:26:37,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-07-12 18:26:37,503 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:37,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 88 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-12 18:26:37,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-07-12 18:26:37,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 38. [2022-07-12 18:26:37,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.206896551724138) internal successors, (35), 31 states have internal predecessors, (35), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-07-12 18:26:37,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2022-07-12 18:26:37,520 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 13 [2022-07-12 18:26:37,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:37,521 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2022-07-12 18:26:37,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:37,521 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2022-07-12 18:26:37,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-07-12 18:26:37,522 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:37,522 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:37,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-07-12 18:26:37,523 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:37,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:37,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1361686065, now seen corresponding path program 1 times [2022-07-12 18:26:37,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:37,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436735633] [2022-07-12 18:26:37,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:37,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:37,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:37,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-07-12 18:26:37,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:37,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:37,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:37,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436735633] [2022-07-12 18:26:37,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436735633] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 18:26:37,611 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 18:26:37,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 18:26:37,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841165918] [2022-07-12 18:26:37,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 18:26:37,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-12 18:26:37,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:37,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-12 18:26:37,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-12 18:26:37,613 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-12 18:26:37,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:37,626 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2022-07-12 18:26:37,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-12 18:26:37,627 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-07-12 18:26:37,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:37,628 INFO L225 Difference]: With dead ends: 37 [2022-07-12 18:26:37,628 INFO L226 Difference]: Without dead ends: 20 [2022-07-12 18:26:37,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-12 18:26:37,629 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 5 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:37,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 41 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-12 18:26:37,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-07-12 18:26:37,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2022-07-12 18:26:37,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:37,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-07-12 18:26:37,631 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2022-07-12 18:26:37,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:37,631 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-07-12 18:26:37,631 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-12 18:26:37,631 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-07-12 18:26:37,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-12 18:26:37,632 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:37,632 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:37,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-07-12 18:26:37,632 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:37,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:37,633 INFO L85 PathProgramCache]: Analyzing trace with hash 312590597, now seen corresponding path program 1 times [2022-07-12 18:26:37,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:37,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663242857] [2022-07-12 18:26:37,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:37,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:37,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:37,746 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:37,746 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:37,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663242857] [2022-07-12 18:26:37,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663242857] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:37,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178088677] [2022-07-12 18:26:37,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:37,747 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:37,747 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:37,749 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) [2022-07-12 18:26:37,750 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-12 18:26:37,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:37,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 21 conjunts are in the unsatisfiable core [2022-07-12 18:26:37,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:37,912 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:37,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:38,050 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 5 treesize of output 3 [2022-07-12 18:26:38,070 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:38,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178088677] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:38,071 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:38,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 20 [2022-07-12 18:26:38,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255456524] [2022-07-12 18:26:38,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:38,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-07-12 18:26:38,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:38,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-07-12 18:26:38,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2022-07-12 18:26:38,073 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 21 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:38,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:38,204 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-07-12 18:26:38,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-12 18:26:38,205 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-07-12 18:26:38,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:38,205 INFO L225 Difference]: With dead ends: 27 [2022-07-12 18:26:38,205 INFO L226 Difference]: Without dead ends: 27 [2022-07-12 18:26:38,206 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2022-07-12 18:26:38,206 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 42 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:38,206 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 55 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-12 18:26:38,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-07-12 18:26:38,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 22. [2022-07-12 18:26:38,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:38,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-07-12 18:26:38,208 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2022-07-12 18:26:38,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:38,208 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-07-12 18:26:38,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:38,208 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-07-12 18:26:38,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-07-12 18:26:38,209 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:38,209 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:38,228 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:38,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-07-12 18:26:38,420 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:38,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:38,420 INFO L85 PathProgramCache]: Analyzing trace with hash 2048380908, now seen corresponding path program 2 times [2022-07-12 18:26:38,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:38,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940387500] [2022-07-12 18:26:38,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:38,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:38,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:38,658 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:38,659 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:38,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940387500] [2022-07-12 18:26:38,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940387500] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:38,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625833891] [2022-07-12 18:26:38,659 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-12 18:26:38,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:38,660 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:38,664 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) [2022-07-12 18:26:38,665 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-12 18:26:38,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-12 18:26:38,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:26:38,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 36 conjunts are in the unsatisfiable core [2022-07-12 18:26:38,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:38,766 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 14 treesize of output 10 [2022-07-12 18:26:39,036 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:26:39,037 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 18 treesize of output 18 [2022-07-12 18:26:39,174 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:39,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:39,592 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 15 treesize of output 13 [2022-07-12 18:26:39,600 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 16 treesize of output 12 [2022-07-12 18:26:39,608 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 26 treesize of output 22 [2022-07-12 18:26:39,637 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:39,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625833891] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:39,638 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:39,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 34 [2022-07-12 18:26:39,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347248779] [2022-07-12 18:26:39,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:39,640 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-07-12 18:26:39,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:39,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-07-12 18:26:39,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1016, Unknown=0, NotChecked=0, Total=1122 [2022-07-12 18:26:39,641 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 26 states have internal predecessors, (42), 9 states have call successors, (9), 9 states have call predecessors, (9), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:40,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:40,070 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2022-07-12 18:26:40,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-07-12 18:26:40,071 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 26 states have internal predecessors, (42), 9 states have call successors, (9), 9 states have call predecessors, (9), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-07-12 18:26:40,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:40,072 INFO L225 Difference]: With dead ends: 44 [2022-07-12 18:26:40,072 INFO L226 Difference]: Without dead ends: 35 [2022-07-12 18:26:40,072 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=202, Invalid=1868, Unknown=0, NotChecked=0, Total=2070 [2022-07-12 18:26:40,073 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 37 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:40,073 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 106 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 87 Invalid, 0 Unknown, 114 Unchecked, 0.1s Time] [2022-07-12 18:26:40,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-07-12 18:26:40,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2022-07-12 18:26:40,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:40,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-07-12 18:26:40,076 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 21 [2022-07-12 18:26:40,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:40,076 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-07-12 18:26:40,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 26 states have internal predecessors, (42), 9 states have call successors, (9), 9 states have call predecessors, (9), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:40,076 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-07-12 18:26:40,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-12 18:26:40,077 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:40,077 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:40,095 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:40,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:40,284 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:40,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:40,284 INFO L85 PathProgramCache]: Analyzing trace with hash 2083749168, now seen corresponding path program 3 times [2022-07-12 18:26:40,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:40,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706873053] [2022-07-12 18:26:40,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:40,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:40,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:40,488 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:40,488 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:40,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706873053] [2022-07-12 18:26:40,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706873053] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:40,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984034840] [2022-07-12 18:26:40,489 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-12 18:26:40,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:40,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:40,492 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) [2022-07-12 18:26:40,492 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-12 18:26:40,550 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-12 18:26:40,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:26:40,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 40 conjunts are in the unsatisfiable core [2022-07-12 18:26:40,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:40,664 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 14 treesize of output 10 [2022-07-12 18:26:40,801 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 15 treesize of output 7 [2022-07-12 18:26:40,803 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:40,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:40,885 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 15 treesize of output 13 [2022-07-12 18:26:40,887 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 26 treesize of output 22 [2022-07-12 18:26:41,015 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:41,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984034840] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:41,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:41,016 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2022-07-12 18:26:41,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727628871] [2022-07-12 18:26:41,018 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:41,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-07-12 18:26:41,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:41,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-07-12 18:26:41,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=672, Unknown=0, NotChecked=0, Total=756 [2022-07-12 18:26:41,020 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 28 states, 25 states have (on average 1.92) internal successors, (48), 23 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:41,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:41,272 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2022-07-12 18:26:41,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-07-12 18:26:41,273 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 1.92) internal successors, (48), 23 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-07-12 18:26:41,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:41,274 INFO L225 Difference]: With dead ends: 50 [2022-07-12 18:26:41,274 INFO L226 Difference]: Without dead ends: 37 [2022-07-12 18:26:41,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=1119, Unknown=0, NotChecked=0, Total=1260 [2022-07-12 18:26:41,275 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:41,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 108 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 195 Invalid, 0 Unknown, 51 Unchecked, 0.1s Time] [2022-07-12 18:26:41,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-07-12 18:26:41,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2022-07-12 18:26:41,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:41,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2022-07-12 18:26:41,277 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2022-07-12 18:26:41,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:41,278 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2022-07-12 18:26:41,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 1.92) internal successors, (48), 23 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:41,278 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2022-07-12 18:26:41,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-07-12 18:26:41,278 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:41,278 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:41,300 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:41,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:41,487 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:41,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:41,488 INFO L85 PathProgramCache]: Analyzing trace with hash 1764143245, now seen corresponding path program 4 times [2022-07-12 18:26:41,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:41,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083786722] [2022-07-12 18:26:41,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:41,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:41,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:41,709 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:41,709 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:41,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083786722] [2022-07-12 18:26:41,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083786722] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:41,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384082558] [2022-07-12 18:26:41,710 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-12 18:26:41,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:41,710 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:41,711 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) [2022-07-12 18:26:41,744 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-12 18:26:41,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-12 18:26:41,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:26:41,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 52 conjunts are in the unsatisfiable core [2022-07-12 18:26:41,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:41,802 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:26:41,898 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 16 treesize of output 12 [2022-07-12 18:26:42,198 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:26:42,198 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 19 treesize of output 19 [2022-07-12 18:26:42,342 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:42,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:42,853 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 15 treesize of output 13 [2022-07-12 18:26:42,856 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 26 treesize of output 22 [2022-07-12 18:26:43,308 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 15 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:43,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384082558] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:43,308 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:43,308 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 44 [2022-07-12 18:26:43,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374732416] [2022-07-12 18:26:43,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:43,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-07-12 18:26:43,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:43,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-07-12 18:26:43,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1795, Unknown=0, NotChecked=0, Total=1980 [2022-07-12 18:26:43,311 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 45 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 33 states have internal predecessors, (77), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:44,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:44,207 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2022-07-12 18:26:44,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-12 18:26:44,211 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 33 states have internal predecessors, (77), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-07-12 18:26:44,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:44,212 INFO L225 Difference]: With dead ends: 44 [2022-07-12 18:26:44,212 INFO L226 Difference]: Without dead ends: 44 [2022-07-12 18:26:44,213 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=363, Invalid=3177, Unknown=0, NotChecked=0, Total=3540 [2022-07-12 18:26:44,214 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 69 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:44,214 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 203 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 513 Invalid, 0 Unknown, 53 Unchecked, 0.3s Time] [2022-07-12 18:26:44,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-07-12 18:26:44,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-07-12 18:26:44,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:44,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-07-12 18:26:44,216 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 33 [2022-07-12 18:26:44,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:44,217 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-07-12 18:26:44,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 33 states have internal predecessors, (77), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:44,217 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-07-12 18:26:44,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-07-12 18:26:44,218 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:44,218 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:44,243 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:44,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-07-12 18:26:44,442 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:44,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:44,442 INFO L85 PathProgramCache]: Analyzing trace with hash 1125055195, now seen corresponding path program 5 times [2022-07-12 18:26:44,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:44,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703174889] [2022-07-12 18:26:44,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:44,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:44,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:44,641 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:44,641 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:44,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703174889] [2022-07-12 18:26:44,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703174889] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:44,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [565903890] [2022-07-12 18:26:44,642 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-12 18:26:44,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:44,642 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:44,643 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) [2022-07-12 18:26:44,645 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-12 18:26:44,719 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2022-07-12 18:26:44,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:26:44,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 42 conjunts are in the unsatisfiable core [2022-07-12 18:26:44,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:44,729 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:26:45,130 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:45,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:45,371 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:45,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [565903890] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:45,371 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:45,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2022-07-12 18:26:45,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881883346] [2022-07-12 18:26:45,372 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:45,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-07-12 18:26:45,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:45,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-07-12 18:26:45,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1276, Unknown=0, NotChecked=0, Total=1482 [2022-07-12 18:26:45,373 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 28 states have internal predecessors, (82), 13 states have call successors, (13), 12 states have call predecessors, (13), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:45,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:45,708 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2022-07-12 18:26:45,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-07-12 18:26:45,708 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 28 states have internal predecessors, (82), 13 states have call successors, (13), 12 states have call predecessors, (13), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-07-12 18:26:45,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:45,708 INFO L225 Difference]: With dead ends: 69 [2022-07-12 18:26:45,709 INFO L226 Difference]: Without dead ends: 49 [2022-07-12 18:26:45,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=326, Invalid=1930, Unknown=0, NotChecked=0, Total=2256 [2022-07-12 18:26:45,710 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 59 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:45,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 147 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-12 18:26:45,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-07-12 18:26:45,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2022-07-12 18:26:45,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:45,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2022-07-12 18:26:45,713 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2022-07-12 18:26:45,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:45,713 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2022-07-12 18:26:45,713 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 28 states have internal predecessors, (82), 13 states have call successors, (13), 12 states have call predecessors, (13), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:45,713 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2022-07-12 18:26:45,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-07-12 18:26:45,714 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:45,714 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:45,731 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:45,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-07-12 18:26:45,920 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:45,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:45,920 INFO L85 PathProgramCache]: Analyzing trace with hash 459737784, now seen corresponding path program 6 times [2022-07-12 18:26:45,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:45,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150368231] [2022-07-12 18:26:45,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:45,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:45,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:46,175 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:46,175 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:46,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150368231] [2022-07-12 18:26:46,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150368231] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:46,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359873054] [2022-07-12 18:26:46,176 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-12 18:26:46,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:46,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:46,177 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) [2022-07-12 18:26:46,178 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-12 18:26:46,239 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-07-12 18:26:46,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:26:46,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 60 conjunts are in the unsatisfiable core [2022-07-12 18:26:46,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:46,381 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 14 treesize of output 10 [2022-07-12 18:26:46,546 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 15 treesize of output 7 [2022-07-12 18:26:46,548 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:46,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:46,642 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 15 treesize of output 13 [2022-07-12 18:26:46,643 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 26 treesize of output 22 [2022-07-12 18:26:46,788 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:46,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359873054] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:46,788 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:46,788 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2022-07-12 18:26:46,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136127822] [2022-07-12 18:26:46,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:46,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-07-12 18:26:46,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:46,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-07-12 18:26:46,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2022-07-12 18:26:46,790 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 36 states, 33 states have (on average 2.121212121212121) internal successors, (70), 29 states have internal predecessors, (70), 10 states have call successors, (10), 8 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:47,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:47,265 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2022-07-12 18:26:47,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-07-12 18:26:47,266 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.121212121212121) internal successors, (70), 29 states have internal predecessors, (70), 10 states have call successors, (10), 8 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2022-07-12 18:26:47,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:47,266 INFO L225 Difference]: With dead ends: 74 [2022-07-12 18:26:47,266 INFO L226 Difference]: Without dead ends: 53 [2022-07-12 18:26:47,267 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=177, Invalid=2079, Unknown=0, NotChecked=0, Total=2256 [2022-07-12 18:26:47,268 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 54 mSDsluCounter, 243 mSDsCounter, 0 mSdLazyCounter, 644 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 644 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:47,268 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 261 Invalid, 685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 644 Invalid, 0 Unknown, 33 Unchecked, 0.3s Time] [2022-07-12 18:26:47,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-07-12 18:26:47,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2022-07-12 18:26:47,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:47,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2022-07-12 18:26:47,270 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 45 [2022-07-12 18:26:47,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:47,270 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2022-07-12 18:26:47,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.121212121212121) internal successors, (70), 29 states have internal predecessors, (70), 10 states have call successors, (10), 8 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:47,271 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2022-07-12 18:26:47,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-07-12 18:26:47,271 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:47,272 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:47,289 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:47,479 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:47,480 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:47,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:47,480 INFO L85 PathProgramCache]: Analyzing trace with hash -414587883, now seen corresponding path program 7 times [2022-07-12 18:26:47,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:47,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460576999] [2022-07-12 18:26:47,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:47,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:47,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:47,748 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:47,748 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:47,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460576999] [2022-07-12 18:26:47,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460576999] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:47,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906700122] [2022-07-12 18:26:47,748 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-12 18:26:47,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:47,748 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:47,749 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:26:47,750 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-07-12 18:26:47,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:47,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 57 conjunts are in the unsatisfiable core [2022-07-12 18:26:47,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:48,057 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:48,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:48,481 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 5 treesize of output 3 [2022-07-12 18:26:48,522 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:48,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906700122] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:48,523 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:48,523 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21, 21] total 43 [2022-07-12 18:26:48,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570910752] [2022-07-12 18:26:48,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:48,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-07-12 18:26:48,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:48,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-07-12 18:26:48,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1729, Unknown=0, NotChecked=0, Total=1892 [2022-07-12 18:26:48,525 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 44 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 31 states have internal predecessors, (87), 14 states have call successors, (14), 13 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:49,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:49,071 INFO L93 Difference]: Finished difference Result 56 states and 57 transitions. [2022-07-12 18:26:49,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-12 18:26:49,071 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 31 states have internal predecessors, (87), 14 states have call successors, (14), 13 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2022-07-12 18:26:49,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:49,072 INFO L225 Difference]: With dead ends: 56 [2022-07-12 18:26:49,072 INFO L226 Difference]: Without dead ends: 56 [2022-07-12 18:26:49,073 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=290, Invalid=2680, Unknown=0, NotChecked=0, Total=2970 [2022-07-12 18:26:49,073 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 101 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 823 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:49,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 303 Invalid, 836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 823 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-12 18:26:49,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-07-12 18:26:49,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2022-07-12 18:26:49,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 7 states have call successors, (7), 7 states have call predecessors, (7), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:49,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-07-12 18:26:49,076 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 49 [2022-07-12 18:26:49,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:49,076 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-07-12 18:26:49,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 31 states have internal predecessors, (87), 14 states have call successors, (14), 13 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:49,076 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-07-12 18:26:49,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-07-12 18:26:49,077 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:49,077 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:49,103 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:49,287 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-07-12 18:26:49,288 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:49,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:49,288 INFO L85 PathProgramCache]: Analyzing trace with hash -1462244612, now seen corresponding path program 8 times [2022-07-12 18:26:49,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:49,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404443645] [2022-07-12 18:26:49,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:49,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:49,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:49,605 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 17 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:49,605 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:49,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404443645] [2022-07-12 18:26:49,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404443645] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:49,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1824627881] [2022-07-12 18:26:49,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-12 18:26:49,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:49,605 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:49,608 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:26:49,615 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-07-12 18:26:49,679 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-12 18:26:49,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:26:49,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 72 conjunts are in the unsatisfiable core [2022-07-12 18:26:49,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:49,814 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 14 treesize of output 10 [2022-07-12 18:26:50,679 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:26:50,679 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 18 treesize of output 18 [2022-07-12 18:26:50,889 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:50,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:51,950 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 15 treesize of output 13 [2022-07-12 18:26:51,956 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 26 treesize of output 22 [2022-07-12 18:26:51,960 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 35 treesize of output 27 [2022-07-12 18:26:52,003 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:52,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1824627881] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:52,003 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:52,003 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 66 [2022-07-12 18:26:52,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374109050] [2022-07-12 18:26:52,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:52,004 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-07-12 18:26:52,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:52,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-07-12 18:26:52,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=4043, Unknown=0, NotChecked=0, Total=4290 [2022-07-12 18:26:52,006 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 66 states, 61 states have (on average 1.8032786885245902) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 21 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:53,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:53,242 INFO L93 Difference]: Finished difference Result 92 states and 93 transitions. [2022-07-12 18:26:53,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-07-12 18:26:53,243 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 61 states have (on average 1.8032786885245902) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 21 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2022-07-12 18:26:53,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:53,243 INFO L225 Difference]: With dead ends: 92 [2022-07-12 18:26:53,243 INFO L226 Difference]: Without dead ends: 67 [2022-07-12 18:26:53,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=444, Invalid=6866, Unknown=0, NotChecked=0, Total=7310 [2022-07-12 18:26:53,245 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 67 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 680 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 505 SdHoareTripleChecker+Invalid, 967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 275 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:53,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 505 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 680 Invalid, 0 Unknown, 275 Unchecked, 0.3s Time] [2022-07-12 18:26:53,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-07-12 18:26:53,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2022-07-12 18:26:53,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 8 states have call successors, (8), 8 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:53,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-07-12 18:26:53,247 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 53 [2022-07-12 18:26:53,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:53,247 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-07-12 18:26:53,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 61 states have (on average 1.8032786885245902) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 21 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:53,248 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-07-12 18:26:53,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-07-12 18:26:53,248 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:53,249 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:53,269 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:53,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-07-12 18:26:53,463 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:53,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:53,464 INFO L85 PathProgramCache]: Analyzing trace with hash 329833536, now seen corresponding path program 9 times [2022-07-12 18:26:53,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:53,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870499043] [2022-07-12 18:26:53,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:53,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:53,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:53,854 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:53,854 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:53,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870499043] [2022-07-12 18:26:53,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870499043] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:53,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190387645] [2022-07-12 18:26:53,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-12 18:26:53,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:53,855 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:53,856 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:26:53,857 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-07-12 18:26:53,935 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-07-12 18:26:53,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:26:53,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 80 conjunts are in the unsatisfiable core [2022-07-12 18:26:53,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:54,160 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 14 treesize of output 10 [2022-07-12 18:26:54,352 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 15 treesize of output 7 [2022-07-12 18:26:54,354 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:54,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:54,509 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 15 treesize of output 13 [2022-07-12 18:26:54,511 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 26 treesize of output 22 [2022-07-12 18:26:54,693 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:54,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190387645] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:54,693 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:54,693 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 44 [2022-07-12 18:26:54,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758303922] [2022-07-12 18:26:54,694 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:54,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-07-12 18:26:54,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:54,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-07-12 18:26:54,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1772, Unknown=0, NotChecked=0, Total=1892 [2022-07-12 18:26:54,695 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 44 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 35 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:55,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:26:55,525 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2022-07-12 18:26:55,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-07-12 18:26:55,526 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 35 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2022-07-12 18:26:55,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:26:55,526 INFO L225 Difference]: With dead ends: 98 [2022-07-12 18:26:55,526 INFO L226 Difference]: Without dead ends: 69 [2022-07-12 18:26:55,527 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 100 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=213, Invalid=3327, Unknown=0, NotChecked=0, Total=3540 [2022-07-12 18:26:55,528 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 51 mSDsluCounter, 478 mSDsCounter, 0 mSdLazyCounter, 1330 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 502 SdHoareTripleChecker+Invalid, 1383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-12 18:26:55,528 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 502 Invalid, 1383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1330 Invalid, 0 Unknown, 44 Unchecked, 0.5s Time] [2022-07-12 18:26:55,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-07-12 18:26:55,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2022-07-12 18:26:55,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 8 states have call successors, (8), 8 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:55,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2022-07-12 18:26:55,531 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2022-07-12 18:26:55,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:26:55,531 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2022-07-12 18:26:55,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 35 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:26:55,531 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2022-07-12 18:26:55,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-07-12 18:26:55,532 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:26:55,532 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:26:55,554 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-07-12 18:26:55,747 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:55,747 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:26:55,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:26:55,748 INFO L85 PathProgramCache]: Analyzing trace with hash 644832157, now seen corresponding path program 10 times [2022-07-12 18:26:55,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:26:55,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961161268] [2022-07-12 18:26:55,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:26:55,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:26:55,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:26:56,129 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:56,130 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:26:56,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961161268] [2022-07-12 18:26:56,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961161268] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:26:56,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045524241] [2022-07-12 18:26:56,130 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-12 18:26:56,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:26:56,130 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:26:56,131 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:26:56,132 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-07-12 18:26:56,201 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-12 18:26:56,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:26:56,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 88 conjunts are in the unsatisfiable core [2022-07-12 18:26:56,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:26:56,213 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:26:56,558 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 16 treesize of output 12 [2022-07-12 18:26:57,270 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:26:57,272 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 19 treesize of output 19 [2022-07-12 18:26:57,470 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 72 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:57,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:26:58,608 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 15 treesize of output 13 [2022-07-12 18:26:58,610 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 26 treesize of output 22 [2022-07-12 18:26:59,617 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 91 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:26:59,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045524241] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:26:59,617 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:26:59,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 29, 29] total 81 [2022-07-12 18:26:59,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488030947] [2022-07-12 18:26:59,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:26:59,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-07-12 18:26:59,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:26:59,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-07-12 18:26:59,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=472, Invalid=6170, Unknown=0, NotChecked=0, Total=6642 [2022-07-12 18:26:59,620 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 82 states, 77 states have (on average 2.142857142857143) internal successors, (165), 58 states have internal predecessors, (165), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:01,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:01,663 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2022-07-12 18:27:01,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-07-12 18:27:01,664 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 77 states have (on average 2.142857142857143) internal successors, (165), 58 states have internal predecessors, (165), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2022-07-12 18:27:01,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:01,664 INFO L225 Difference]: With dead ends: 76 [2022-07-12 18:27:01,664 INFO L226 Difference]: Without dead ends: 76 [2022-07-12 18:27:01,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=856, Invalid=10274, Unknown=0, NotChecked=0, Total=11130 [2022-07-12 18:27:01,667 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 186 mSDsluCounter, 562 mSDsCounter, 0 mSdLazyCounter, 1702 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 1833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:01,667 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 590 Invalid, 1833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1702 Invalid, 0 Unknown, 96 Unchecked, 0.7s Time] [2022-07-12 18:27:01,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-07-12 18:27:01,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2022-07-12 18:27:01,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:01,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2022-07-12 18:27:01,669 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 65 [2022-07-12 18:27:01,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:01,670 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2022-07-12 18:27:01,670 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 77 states have (on average 2.142857142857143) internal successors, (165), 58 states have internal predecessors, (165), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:01,670 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2022-07-12 18:27:01,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-07-12 18:27:01,671 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:01,671 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:01,689 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-07-12 18:27:01,883 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:01,883 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:01,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:01,884 INFO L85 PathProgramCache]: Analyzing trace with hash 851678699, now seen corresponding path program 11 times [2022-07-12 18:27:01,884 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:01,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774750623] [2022-07-12 18:27:01,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:01,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:01,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:02,294 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 132 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:02,294 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:02,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774750623] [2022-07-12 18:27:02,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774750623] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:02,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324611841] [2022-07-12 18:27:02,294 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-12 18:27:02,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:02,294 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:02,295 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:02,296 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-07-12 18:27:02,405 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2022-07-12 18:27:02,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:27:02,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 70 conjunts are in the unsatisfiable core [2022-07-12 18:27:02,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:02,417 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:27:03,232 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:03,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:03,717 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:03,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324611841] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:03,718 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:03,718 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 67 [2022-07-12 18:27:03,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278395177] [2022-07-12 18:27:03,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:03,719 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-07-12 18:27:03,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:03,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-07-12 18:27:03,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=3862, Unknown=0, NotChecked=0, Total=4422 [2022-07-12 18:27:03,721 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 48 states have internal predecessors, (154), 21 states have call successors, (21), 20 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:04,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:04,315 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2022-07-12 18:27:04,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-07-12 18:27:04,315 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 48 states have internal predecessors, (154), 21 states have call successors, (21), 20 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2022-07-12 18:27:04,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:04,316 INFO L225 Difference]: With dead ends: 117 [2022-07-12 18:27:04,316 INFO L226 Difference]: Without dead ends: 81 [2022-07-12 18:27:04,317 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2047 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=930, Invalid=6042, Unknown=0, NotChecked=0, Total=6972 [2022-07-12 18:27:04,318 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 93 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:04,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 249 Invalid, 718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-12 18:27:04,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-07-12 18:27:04,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2022-07-12 18:27:04,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:04,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2022-07-12 18:27:04,320 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 73 [2022-07-12 18:27:04,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:04,320 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2022-07-12 18:27:04,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 48 states have internal predecessors, (154), 21 states have call successors, (21), 20 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:04,321 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2022-07-12 18:27:04,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-07-12 18:27:04,321 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:04,321 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:04,340 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-07-12 18:27:04,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-07-12 18:27:04,531 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:04,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:04,532 INFO L85 PathProgramCache]: Analyzing trace with hash -228789816, now seen corresponding path program 12 times [2022-07-12 18:27:04,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:04,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056022222] [2022-07-12 18:27:04,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:04,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:04,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:05,156 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:05,156 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:05,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056022222] [2022-07-12 18:27:05,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056022222] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:05,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083557077] [2022-07-12 18:27:05,157 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-12 18:27:05,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:05,157 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:05,158 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:05,159 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-07-12 18:27:05,265 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-07-12 18:27:05,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:27:05,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 100 conjunts are in the unsatisfiable core [2022-07-12 18:27:05,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:05,574 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 14 treesize of output 10 [2022-07-12 18:27:05,793 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 15 treesize of output 7 [2022-07-12 18:27:05,795 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:05,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:05,927 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 15 treesize of output 13 [2022-07-12 18:27:05,931 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 26 treesize of output 22 [2022-07-12 18:27:06,152 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:06,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2083557077] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:06,152 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:06,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 52 [2022-07-12 18:27:06,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063196899] [2022-07-12 18:27:06,152 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:06,153 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-07-12 18:27:06,153 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:06,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-07-12 18:27:06,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2514, Unknown=0, NotChecked=0, Total=2652 [2022-07-12 18:27:06,154 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 52 states, 49 states have (on average 2.326530612244898) internal successors, (114), 41 states have internal predecessors, (114), 14 states have call successors, (14), 12 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:07,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:07,243 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2022-07-12 18:27:07,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-07-12 18:27:07,243 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 49 states have (on average 2.326530612244898) internal successors, (114), 41 states have internal predecessors, (114), 14 states have call successors, (14), 12 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2022-07-12 18:27:07,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:07,244 INFO L225 Difference]: With dead ends: 122 [2022-07-12 18:27:07,244 INFO L226 Difference]: Without dead ends: 85 [2022-07-12 18:27:07,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 129 SyntacticMatches, 6 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=249, Invalid=4863, Unknown=0, NotChecked=0, Total=5112 [2022-07-12 18:27:07,245 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 68 mSDsluCounter, 709 mSDsCounter, 0 mSdLazyCounter, 1956 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 739 SdHoareTripleChecker+Invalid, 2072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1956 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:07,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 739 Invalid, 2072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1956 Invalid, 0 Unknown, 105 Unchecked, 0.6s Time] [2022-07-12 18:27:07,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-07-12 18:27:07,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2022-07-12 18:27:07,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:07,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2022-07-12 18:27:07,248 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2022-07-12 18:27:07,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:07,248 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2022-07-12 18:27:07,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 49 states have (on average 2.326530612244898) internal successors, (114), 41 states have internal predecessors, (114), 14 states have call successors, (14), 12 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:07,248 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2022-07-12 18:27:07,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-07-12 18:27:07,249 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:07,249 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:07,268 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-07-12 18:27:07,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-07-12 18:27:07,459 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:07,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:07,460 INFO L85 PathProgramCache]: Analyzing trace with hash 1274746661, now seen corresponding path program 13 times [2022-07-12 18:27:07,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:07,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342547991] [2022-07-12 18:27:07,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:07,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:07,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:07,961 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 91 proven. 224 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:07,961 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:07,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342547991] [2022-07-12 18:27:07,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342547991] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:07,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794568787] [2022-07-12 18:27:07,962 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-12 18:27:07,962 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:07,962 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:07,963 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:07,963 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-07-12 18:27:08,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:08,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 93 conjunts are in the unsatisfiable core [2022-07-12 18:27:08,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:08,497 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:08,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:09,313 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 5 treesize of output 3 [2022-07-12 18:27:09,380 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:09,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794568787] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:09,381 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:09,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 33, 33] total 67 [2022-07-12 18:27:09,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859650324] [2022-07-12 18:27:09,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:09,382 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-07-12 18:27:09,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:09,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-07-12 18:27:09,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=4225, Unknown=0, NotChecked=0, Total=4556 [2022-07-12 18:27:09,384 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 68 states, 65 states have (on average 2.2) internal successors, (143), 47 states have internal predecessors, (143), 22 states have call successors, (22), 21 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:10,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:10,618 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2022-07-12 18:27:10,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-07-12 18:27:10,619 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 65 states have (on average 2.2) internal successors, (143), 47 states have internal predecessors, (143), 22 states have call successors, (22), 21 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2022-07-12 18:27:10,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:10,620 INFO L225 Difference]: With dead ends: 88 [2022-07-12 18:27:10,620 INFO L226 Difference]: Without dead ends: 88 [2022-07-12 18:27:10,620 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 123 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1383 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=640, Invalid=6842, Unknown=0, NotChecked=0, Total=7482 [2022-07-12 18:27:10,624 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 180 mSDsluCounter, 675 mSDsCounter, 0 mSdLazyCounter, 2018 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 710 SdHoareTripleChecker+Invalid, 2035 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2018 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:10,624 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 710 Invalid, 2035 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2018 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-07-12 18:27:10,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-07-12 18:27:10,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2022-07-12 18:27:10,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 11 states have call successors, (11), 11 states have call predecessors, (11), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:10,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2022-07-12 18:27:10,626 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 81 [2022-07-12 18:27:10,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:10,627 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2022-07-12 18:27:10,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 65 states have (on average 2.2) internal successors, (143), 47 states have internal predecessors, (143), 22 states have call successors, (22), 21 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:10,627 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2022-07-12 18:27:10,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-07-12 18:27:10,628 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:10,628 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:10,646 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-07-12 18:27:10,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:10,835 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:10,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:10,836 INFO L85 PathProgramCache]: Analyzing trace with hash 479794700, now seen corresponding path program 14 times [2022-07-12 18:27:10,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:10,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257738641] [2022-07-12 18:27:10,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:10,836 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:10,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:11,398 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 29 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:11,398 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:11,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257738641] [2022-07-12 18:27:11,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [257738641] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:11,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894590845] [2022-07-12 18:27:11,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-12 18:27:11,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:11,399 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:11,401 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:11,402 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-07-12 18:27:11,492 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-12 18:27:11,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:27:11,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 108 conjunts are in the unsatisfiable core [2022-07-12 18:27:11,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:11,802 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 14 treesize of output 10 [2022-07-12 18:27:13,433 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:27:13,433 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 18 treesize of output 18 [2022-07-12 18:27:13,670 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:13,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:15,755 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 15 treesize of output 13 [2022-07-12 18:27:15,759 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 26 treesize of output 22 [2022-07-12 18:27:15,763 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 35 treesize of output 27 [2022-07-12 18:27:15,827 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:15,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894590845] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:15,828 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:15,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37] total 98 [2022-07-12 18:27:15,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198090282] [2022-07-12 18:27:15,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:15,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2022-07-12 18:27:15,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:15,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2022-07-12 18:27:15,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=9051, Unknown=0, NotChecked=0, Total=9506 [2022-07-12 18:27:15,830 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 98 states, 93 states have (on average 1.913978494623656) internal successors, (178), 66 states have internal predecessors, (178), 33 states have call successors, (33), 33 states have call predecessors, (33), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:18,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:18,847 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2022-07-12 18:27:18,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-07-12 18:27:18,848 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 93 states have (on average 1.913978494623656) internal successors, (178), 66 states have internal predecessors, (178), 33 states have call successors, (33), 33 states have call predecessors, (33), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2022-07-12 18:27:18,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:18,848 INFO L225 Difference]: With dead ends: 140 [2022-07-12 18:27:18,848 INFO L226 Difference]: Without dead ends: 99 [2022-07-12 18:27:18,850 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2153 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=792, Invalid=14958, Unknown=0, NotChecked=0, Total=15750 [2022-07-12 18:27:18,850 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 99 mSDsluCounter, 1086 mSDsCounter, 0 mSdLazyCounter, 1634 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 1122 SdHoareTripleChecker+Invalid, 2243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 592 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:18,850 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 1122 Invalid, 2243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1634 Invalid, 0 Unknown, 592 Unchecked, 0.6s Time] [2022-07-12 18:27:18,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-07-12 18:27:18,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 94. [2022-07-12 18:27:18,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:18,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2022-07-12 18:27:18,853 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 85 [2022-07-12 18:27:18,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:18,853 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2022-07-12 18:27:18,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 93 states have (on average 1.913978494623656) internal successors, (178), 66 states have internal predecessors, (178), 33 states have call successors, (33), 33 states have call predecessors, (33), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:18,854 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2022-07-12 18:27:18,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-07-12 18:27:18,854 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:18,854 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:18,874 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-07-12 18:27:19,059 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:19,059 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:19,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:19,060 INFO L85 PathProgramCache]: Analyzing trace with hash -790148272, now seen corresponding path program 15 times [2022-07-12 18:27:19,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:19,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273619360] [2022-07-12 18:27:19,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:19,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:19,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:19,891 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:19,891 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:19,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273619360] [2022-07-12 18:27:19,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273619360] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:19,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217292617] [2022-07-12 18:27:19,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-12 18:27:19,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:19,892 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:19,893 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:19,893 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-07-12 18:27:20,053 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-07-12 18:27:20,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:27:20,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 120 conjunts are in the unsatisfiable core [2022-07-12 18:27:20,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:20,488 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 14 treesize of output 10 [2022-07-12 18:27:20,735 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 15 treesize of output 7 [2022-07-12 18:27:20,737 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:20,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:20,906 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 15 treesize of output 13 [2022-07-12 18:27:20,908 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 26 treesize of output 22 [2022-07-12 18:27:21,149 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:21,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217292617] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:21,149 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:21,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 60 [2022-07-12 18:27:21,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146532344] [2022-07-12 18:27:21,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:21,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-07-12 18:27:21,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:21,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-07-12 18:27:21,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=3384, Unknown=0, NotChecked=0, Total=3540 [2022-07-12 18:27:21,150 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 60 states, 57 states have (on average 2.3859649122807016) internal successors, (136), 47 states have internal predecessors, (136), 16 states have call successors, (16), 14 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:22,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:22,735 INFO L93 Difference]: Finished difference Result 146 states and 147 transitions. [2022-07-12 18:27:22,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-07-12 18:27:22,735 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 57 states have (on average 2.3859649122807016) internal successors, (136), 47 states have internal predecessors, (136), 16 states have call successors, (16), 14 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2022-07-12 18:27:22,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:22,736 INFO L225 Difference]: With dead ends: 146 [2022-07-12 18:27:22,736 INFO L226 Difference]: Without dead ends: 101 [2022-07-12 18:27:22,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 160 SyntacticMatches, 5 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=285, Invalid=6687, Unknown=0, NotChecked=0, Total=6972 [2022-07-12 18:27:22,737 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 73 mSDsluCounter, 996 mSDsCounter, 0 mSdLazyCounter, 2838 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 1032 SdHoareTripleChecker+Invalid, 2914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 2838 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:22,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 1032 Invalid, 2914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 2838 Invalid, 0 Unknown, 63 Unchecked, 0.9s Time] [2022-07-12 18:27:22,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-07-12 18:27:22,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 98. [2022-07-12 18:27:22,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 states have internal predecessors, (87), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:22,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2022-07-12 18:27:22,740 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 93 [2022-07-12 18:27:22,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:22,740 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2022-07-12 18:27:22,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 57 states have (on average 2.3859649122807016) internal successors, (136), 47 states have internal predecessors, (136), 16 states have call successors, (16), 14 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:22,741 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2022-07-12 18:27:22,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-07-12 18:27:22,742 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:22,742 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:22,766 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-07-12 18:27:22,963 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-07-12 18:27:22,963 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:22,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:22,964 INFO L85 PathProgramCache]: Analyzing trace with hash 156309165, now seen corresponding path program 16 times [2022-07-12 18:27:22,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:22,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707381749] [2022-07-12 18:27:22,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:22,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:22,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:23,696 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 153 proven. 320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:23,696 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:23,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707381749] [2022-07-12 18:27:23,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707381749] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:23,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556205038] [2022-07-12 18:27:23,697 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-12 18:27:23,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:23,697 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:23,698 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:23,699 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-07-12 18:27:23,807 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-12 18:27:23,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:27:23,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 124 conjunts are in the unsatisfiable core [2022-07-12 18:27:23,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:23,818 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:27:24,433 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 16 treesize of output 12 [2022-07-12 18:27:25,892 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:27:25,893 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 19 treesize of output 19 [2022-07-12 18:27:26,156 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 200 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:26,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:28,320 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 15 treesize of output 13 [2022-07-12 18:27:28,322 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 26 treesize of output 22 [2022-07-12 18:27:30,091 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 231 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:30,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1556205038] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:30,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:30,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 41, 41] total 117 [2022-07-12 18:27:30,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186727928] [2022-07-12 18:27:30,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:30,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-07-12 18:27:30,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:30,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-07-12 18:27:30,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=906, Invalid=12900, Unknown=0, NotChecked=0, Total=13806 [2022-07-12 18:27:30,094 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 118 states, 113 states have (on average 2.2035398230088497) internal successors, (249), 82 states have internal predecessors, (249), 36 states have call successors, (36), 36 states have call predecessors, (36), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:33,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:33,584 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2022-07-12 18:27:33,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-07-12 18:27:33,585 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 113 states have (on average 2.2035398230088497) internal successors, (249), 82 states have internal predecessors, (249), 36 states have call successors, (36), 36 states have call predecessors, (36), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2022-07-12 18:27:33,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:33,585 INFO L225 Difference]: With dead ends: 108 [2022-07-12 18:27:33,585 INFO L226 Difference]: Without dead ends: 108 [2022-07-12 18:27:33,586 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3666 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1528, Invalid=20822, Unknown=0, NotChecked=0, Total=22350 [2022-07-12 18:27:33,587 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 254 mSDsluCounter, 1137 mSDsCounter, 0 mSdLazyCounter, 3408 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 1177 SdHoareTripleChecker+Invalid, 3569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 3408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 120 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:33,587 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 1177 Invalid, 3569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 3408 Invalid, 0 Unknown, 120 Unchecked, 1.3s Time] [2022-07-12 18:27:33,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-07-12 18:27:33,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2022-07-12 18:27:33,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 14 states have call successors, (14), 14 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:33,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2022-07-12 18:27:33,589 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 97 [2022-07-12 18:27:33,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:33,590 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2022-07-12 18:27:33,590 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 113 states have (on average 2.2035398230088497) internal successors, (249), 82 states have internal predecessors, (249), 36 states have call successors, (36), 36 states have call predecessors, (36), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:33,590 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2022-07-12 18:27:33,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-07-12 18:27:33,591 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:33,591 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:33,615 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-07-12 18:27:33,814 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-07-12 18:27:33,815 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:33,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:33,815 INFO L85 PathProgramCache]: Analyzing trace with hash -436125445, now seen corresponding path program 17 times [2022-07-12 18:27:33,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:33,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029480445] [2022-07-12 18:27:33,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:33,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:33,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:34,573 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 292 proven. 277 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:34,573 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:34,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029480445] [2022-07-12 18:27:34,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029480445] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:34,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064992067] [2022-07-12 18:27:34,573 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-12 18:27:34,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:34,574 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:34,574 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:34,575 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-07-12 18:27:34,703 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2022-07-12 18:27:34,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:27:34,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 98 conjunts are in the unsatisfiable core [2022-07-12 18:27:34,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:34,714 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:27:36,247 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:36,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:37,088 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:37,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064992067] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:37,089 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:37,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 96 [2022-07-12 18:27:37,089 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820719024] [2022-07-12 18:27:37,089 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:37,089 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-07-12 18:27:37,089 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:37,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-07-12 18:27:37,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1173, Invalid=7947, Unknown=0, NotChecked=0, Total=9120 [2022-07-12 18:27:37,091 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 96 states, 95 states have (on average 2.3789473684210525) internal successors, (226), 69 states have internal predecessors, (226), 29 states have call successors, (29), 28 states have call predecessors, (29), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:37,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:37,763 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2022-07-12 18:27:37,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-07-12 18:27:37,763 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 2.3789473684210525) internal successors, (226), 69 states have internal predecessors, (226), 29 states have call successors, (29), 28 states have call predecessors, (29), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 105 [2022-07-12 18:27:37,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:37,764 INFO L225 Difference]: With dead ends: 165 [2022-07-12 18:27:37,764 INFO L226 Difference]: Without dead ends: 113 [2022-07-12 18:27:37,765 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3696 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1651, Invalid=10339, Unknown=0, NotChecked=0, Total=11990 [2022-07-12 18:27:37,766 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 102 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 931 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 944 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 931 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:37,766 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 323 Invalid, 944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 931 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-07-12 18:27:37,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-07-12 18:27:37,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 110. [2022-07-12 18:27:37,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 14 states have call successors, (14), 14 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:37,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2022-07-12 18:27:37,769 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 105 [2022-07-12 18:27:37,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:37,769 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2022-07-12 18:27:37,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 95 states have (on average 2.3789473684210525) internal successors, (226), 69 states have internal predecessors, (226), 29 states have call successors, (29), 28 states have call predecessors, (29), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:37,769 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2022-07-12 18:27:37,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-07-12 18:27:37,770 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:37,770 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:37,787 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-07-12 18:27:37,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-07-12 18:27:37,975 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:37,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:37,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1420552408, now seen corresponding path program 18 times [2022-07-12 18:27:37,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:37,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882029954] [2022-07-12 18:27:37,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:37,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:38,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:38,962 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:38,963 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:38,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882029954] [2022-07-12 18:27:38,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1882029954] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:38,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499289834] [2022-07-12 18:27:38,963 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-12 18:27:38,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:38,964 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:38,965 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:38,966 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-07-12 18:27:39,202 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2022-07-12 18:27:39,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:27:39,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 140 conjunts are in the unsatisfiable core [2022-07-12 18:27:39,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:39,746 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 14 treesize of output 10 [2022-07-12 18:27:40,017 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 15 treesize of output 7 [2022-07-12 18:27:40,019 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:40,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:40,204 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 15 treesize of output 13 [2022-07-12 18:27:40,207 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 26 treesize of output 22 [2022-07-12 18:27:40,659 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:40,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499289834] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:40,659 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:40,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 68 [2022-07-12 18:27:40,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856454564] [2022-07-12 18:27:40,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:40,660 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-07-12 18:27:40,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:40,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-07-12 18:27:40,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=4382, Unknown=0, NotChecked=0, Total=4556 [2022-07-12 18:27:40,661 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand has 68 states, 65 states have (on average 2.4307692307692306) internal successors, (158), 53 states have internal predecessors, (158), 18 states have call successors, (18), 16 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:42,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:42,807 INFO L93 Difference]: Finished difference Result 170 states and 171 transitions. [2022-07-12 18:27:42,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-07-12 18:27:42,807 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 65 states have (on average 2.4307692307692306) internal successors, (158), 53 states have internal predecessors, (158), 18 states have call successors, (18), 16 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2022-07-12 18:27:42,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:42,808 INFO L225 Difference]: With dead ends: 170 [2022-07-12 18:27:42,808 INFO L226 Difference]: Without dead ends: 117 [2022-07-12 18:27:42,809 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 185 SyntacticMatches, 10 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=321, Invalid=8799, Unknown=0, NotChecked=0, Total=9120 [2022-07-12 18:27:42,809 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 87 mSDsluCounter, 1420 mSDsCounter, 0 mSdLazyCounter, 4080 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 1462 SdHoareTripleChecker+Invalid, 4170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 4080 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 74 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:42,809 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 1462 Invalid, 4170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 4080 Invalid, 0 Unknown, 74 Unchecked, 1.2s Time] [2022-07-12 18:27:42,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-07-12 18:27:42,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 114. [2022-07-12 18:27:42,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 14 states have call successors, (14), 14 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:42,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2022-07-12 18:27:42,812 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 109 [2022-07-12 18:27:42,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:42,812 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2022-07-12 18:27:42,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 65 states have (on average 2.4307692307692306) internal successors, (158), 53 states have internal predecessors, (158), 18 states have call successors, (18), 16 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:42,812 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2022-07-12 18:27:42,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-07-12 18:27:42,813 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:42,813 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:42,830 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-07-12 18:27:43,013 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:43,013 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:43,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:43,014 INFO L85 PathProgramCache]: Analyzing trace with hash -1680516555, now seen corresponding path program 19 times [2022-07-12 18:27:43,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:43,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774055692] [2022-07-12 18:27:43,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:43,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:43,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:43,919 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 231 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:43,919 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:43,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774055692] [2022-07-12 18:27:43,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774055692] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:43,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682926613] [2022-07-12 18:27:43,920 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-12 18:27:43,920 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:43,920 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:43,925 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:43,926 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-07-12 18:27:44,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:44,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 129 conjunts are in the unsatisfiable core [2022-07-12 18:27:44,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:44,707 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 276 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:44,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:46,005 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 5 treesize of output 3 [2022-07-12 18:27:46,091 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 276 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:46,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1682926613] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:46,091 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:46,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 45] total 92 [2022-07-12 18:27:46,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006155706] [2022-07-12 18:27:46,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:46,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-07-12 18:27:46,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:46,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-07-12 18:27:46,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=659, Invalid=7897, Unknown=0, NotChecked=0, Total=8556 [2022-07-12 18:27:46,094 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand has 93 states, 89 states have (on average 2.235955056179775) internal successors, (199), 64 states have internal predecessors, (199), 30 states have call successors, (30), 29 states have call predecessors, (30), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:47,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:47,642 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2022-07-12 18:27:47,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-07-12 18:27:47,643 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 89 states have (on average 2.235955056179775) internal successors, (199), 64 states have internal predecessors, (199), 30 states have call successors, (30), 29 states have call predecessors, (30), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2022-07-12 18:27:47,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:47,644 INFO L225 Difference]: With dead ends: 120 [2022-07-12 18:27:47,644 INFO L226 Difference]: Without dead ends: 120 [2022-07-12 18:27:47,645 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3096 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=961, Invalid=10595, Unknown=0, NotChecked=0, Total=11556 [2022-07-12 18:27:47,645 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 211 mSDsluCounter, 1132 mSDsCounter, 0 mSdLazyCounter, 3397 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1179 SdHoareTripleChecker+Invalid, 3420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 3397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:47,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 1179 Invalid, 3420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 3397 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-07-12 18:27:47,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-07-12 18:27:47,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2022-07-12 18:27:47,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 states have internal predecessors, (104), 15 states have call successors, (15), 15 states have call predecessors, (15), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:47,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2022-07-12 18:27:47,648 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 113 [2022-07-12 18:27:47,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:47,649 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2022-07-12 18:27:47,649 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 89 states have (on average 2.235955056179775) internal successors, (199), 64 states have internal predecessors, (199), 30 states have call successors, (30), 29 states have call predecessors, (30), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:47,649 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2022-07-12 18:27:47,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-07-12 18:27:47,650 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:47,650 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:47,670 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-07-12 18:27:47,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-07-12 18:27:47,863 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:47,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:47,864 INFO L85 PathProgramCache]: Analyzing trace with hash -1602531044, now seen corresponding path program 20 times [2022-07-12 18:27:47,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:47,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391676870] [2022-07-12 18:27:47,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:47,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:47,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:27:48,845 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 41 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:48,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:27:48,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391676870] [2022-07-12 18:27:48,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391676870] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:27:48,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469040061] [2022-07-12 18:27:48,846 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-12 18:27:48,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:48,846 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:27:48,847 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:27:48,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-07-12 18:27:48,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-12 18:27:48,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:27:48,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 144 conjunts are in the unsatisfiable core [2022-07-12 18:27:48,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:27:49,497 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 14 treesize of output 10 [2022-07-12 18:27:52,110 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:27:52,110 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 18 treesize of output 18 [2022-07-12 18:27:52,423 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 276 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:52,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:27:55,710 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 15 treesize of output 13 [2022-07-12 18:27:55,713 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 26 treesize of output 22 [2022-07-12 18:27:55,715 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 35 treesize of output 27 [2022-07-12 18:27:55,817 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 276 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:27:55,817 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [469040061] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:27:55,817 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:27:55,817 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 49, 49] total 130 [2022-07-12 18:27:55,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107040912] [2022-07-12 18:27:55,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:27:55,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2022-07-12 18:27:55,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:27:55,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2022-07-12 18:27:55,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=727, Invalid=16043, Unknown=0, NotChecked=0, Total=16770 [2022-07-12 18:27:55,820 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand has 130 states, 125 states have (on average 1.968) internal successors, (246), 86 states have internal predecessors, (246), 45 states have call successors, (45), 45 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:59,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:27:59,588 INFO L93 Difference]: Finished difference Result 188 states and 189 transitions. [2022-07-12 18:27:59,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-07-12 18:27:59,589 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 125 states have (on average 1.968) internal successors, (246), 86 states have internal predecessors, (246), 45 states have call successors, (45), 45 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2022-07-12 18:27:59,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:27:59,590 INFO L225 Difference]: With dead ends: 188 [2022-07-12 18:27:59,590 INFO L226 Difference]: Without dead ends: 131 [2022-07-12 18:27:59,592 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 175 SyntacticMatches, 3 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3750 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=1230, Invalid=25830, Unknown=0, NotChecked=0, Total=27060 [2022-07-12 18:27:59,592 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 108 mSDsluCounter, 2124 mSDsCounter, 0 mSdLazyCounter, 2651 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 2172 SdHoareTripleChecker+Invalid, 4394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 2651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1724 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-07-12 18:27:59,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 2172 Invalid, 4394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 2651 Invalid, 0 Unknown, 1724 Unchecked, 0.9s Time] [2022-07-12 18:27:59,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-07-12 18:27:59,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 126. [2022-07-12 18:27:59,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 109 states have (on average 1.018348623853211) internal successors, (111), 109 states have internal predecessors, (111), 16 states have call successors, (16), 16 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:59,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2022-07-12 18:27:59,596 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 117 [2022-07-12 18:27:59,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:27:59,596 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2022-07-12 18:27:59,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 125 states have (on average 1.968) internal successors, (246), 86 states have internal predecessors, (246), 45 states have call successors, (45), 45 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:27:59,597 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2022-07-12 18:27:59,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-07-12 18:27:59,597 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:27:59,598 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:27:59,619 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-07-12 18:27:59,811 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:27:59,811 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:27:59,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:27:59,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1357985184, now seen corresponding path program 21 times [2022-07-12 18:27:59,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:27:59,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954749069] [2022-07-12 18:27:59,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:27:59,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:27:59,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:28:00,993 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 44 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:00,993 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:28:00,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954749069] [2022-07-12 18:28:00,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [954749069] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:28:00,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036525034] [2022-07-12 18:28:00,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-12 18:28:00,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:28:00,994 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:28:00,994 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:28:00,995 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-07-12 18:28:01,390 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-07-12 18:28:01,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:28:01,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 160 conjunts are in the unsatisfiable core [2022-07-12 18:28:01,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:28:02,080 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 14 treesize of output 10 [2022-07-12 18:28:02,380 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 15 treesize of output 7 [2022-07-12 18:28:02,382 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 44 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:02,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:28:02,579 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 15 treesize of output 13 [2022-07-12 18:28:02,581 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 26 treesize of output 22 [2022-07-12 18:28:03,081 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 44 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:03,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036525034] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:28:03,081 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:28:03,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2022-07-12 18:28:03,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459101863] [2022-07-12 18:28:03,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:28:03,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-07-12 18:28:03,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:28:03,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-07-12 18:28:03,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=5508, Unknown=0, NotChecked=0, Total=5700 [2022-07-12 18:28:03,083 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand has 76 states, 73 states have (on average 2.4657534246575343) internal successors, (180), 59 states have internal predecessors, (180), 20 states have call successors, (20), 18 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:05,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:28:05,731 INFO L93 Difference]: Finished difference Result 194 states and 195 transitions. [2022-07-12 18:28:05,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-07-12 18:28:05,731 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 73 states have (on average 2.4657534246575343) internal successors, (180), 59 states have internal predecessors, (180), 20 states have call successors, (20), 18 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 125 [2022-07-12 18:28:05,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:28:05,732 INFO L225 Difference]: With dead ends: 194 [2022-07-12 18:28:05,732 INFO L226 Difference]: Without dead ends: 133 [2022-07-12 18:28:05,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 215 SyntacticMatches, 10 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=357, Invalid=11199, Unknown=0, NotChecked=0, Total=11556 [2022-07-12 18:28:05,734 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 95 mSDsluCounter, 1753 mSDsCounter, 0 mSdLazyCounter, 5067 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 1801 SdHoareTripleChecker+Invalid, 5179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 5067 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 95 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-07-12 18:28:05,734 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 1801 Invalid, 5179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 5067 Invalid, 0 Unknown, 95 Unchecked, 1.5s Time] [2022-07-12 18:28:05,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-07-12 18:28:05,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 130. [2022-07-12 18:28:05,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 113 states have (on average 1.0176991150442478) internal successors, (115), 113 states have internal predecessors, (115), 16 states have call successors, (16), 16 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:05,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2022-07-12 18:28:05,737 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 125 [2022-07-12 18:28:05,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:28:05,737 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2022-07-12 18:28:05,737 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 73 states have (on average 2.4657534246575343) internal successors, (180), 59 states have internal predecessors, (180), 20 states have call successors, (20), 18 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:05,737 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2022-07-12 18:28:05,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-07-12 18:28:05,738 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:28:05,738 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:28:05,757 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-07-12 18:28:05,943 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:28:05,944 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:28:05,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:28:05,944 INFO L85 PathProgramCache]: Analyzing trace with hash -856956483, now seen corresponding path program 22 times [2022-07-12 18:28:05,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:28:05,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825333708] [2022-07-12 18:28:05,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:28:05,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:28:05,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:28:07,002 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 325 proven. 560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:07,003 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:28:07,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825333708] [2022-07-12 18:28:07,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825333708] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:28:07,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227989124] [2022-07-12 18:28:07,003 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-12 18:28:07,003 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:28:07,003 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:28:07,005 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:28:07,005 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-07-12 18:28:07,130 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-12 18:28:07,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:28:07,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 160 conjunts are in the unsatisfiable core [2022-07-12 18:28:07,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:28:07,140 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:28:08,094 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 16 treesize of output 12 [2022-07-12 18:28:10,364 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:28:10,364 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 19 treesize of output 19 [2022-07-12 18:28:10,702 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 392 proven. 493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:10,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:28:14,113 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 15 treesize of output 13 [2022-07-12 18:28:14,116 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 26 treesize of output 22 [2022-07-12 18:28:16,798 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 435 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:16,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227989124] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:28:16,799 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:28:16,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 53, 53] total 153 [2022-07-12 18:28:16,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330648725] [2022-07-12 18:28:16,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:28:16,799 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2022-07-12 18:28:16,799 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:28:16,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2022-07-12 18:28:16,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1484, Invalid=22078, Unknown=0, NotChecked=0, Total=23562 [2022-07-12 18:28:16,804 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 154 states, 149 states have (on average 2.2348993288590604) internal successors, (333), 106 states have internal predecessors, (333), 48 states have call successors, (48), 48 states have call predecessors, (48), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:22,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:28:22,074 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2022-07-12 18:28:22,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-07-12 18:28:22,074 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 149 states have (on average 2.2348993288590604) internal successors, (333), 106 states have internal predecessors, (333), 48 states have call successors, (48), 48 states have call predecessors, (48), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 129 [2022-07-12 18:28:22,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:28:22,075 INFO L225 Difference]: With dead ends: 140 [2022-07-12 18:28:22,075 INFO L226 Difference]: Without dead ends: 140 [2022-07-12 18:28:22,076 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6358 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=2392, Invalid=35050, Unknown=0, NotChecked=0, Total=37442 [2022-07-12 18:28:22,077 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 368 mSDsluCounter, 1836 mSDsCounter, 0 mSdLazyCounter, 5475 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 1888 SdHoareTripleChecker+Invalid, 5665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 5475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 141 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-07-12 18:28:22,077 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [368 Valid, 1888 Invalid, 5665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 5475 Invalid, 0 Unknown, 141 Unchecked, 2.0s Time] [2022-07-12 18:28:22,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-07-12 18:28:22,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 138. [2022-07-12 18:28:22,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 18 states have call successors, (18), 18 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:22,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2022-07-12 18:28:22,086 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 129 [2022-07-12 18:28:22,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:28:22,088 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2022-07-12 18:28:22,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 149 states have (on average 2.2348993288590604) internal successors, (333), 106 states have internal predecessors, (333), 48 states have call successors, (48), 48 states have call predecessors, (48), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:22,089 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2022-07-12 18:28:22,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-07-12 18:28:22,090 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:28:22,090 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:28:22,107 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-07-12 18:28:22,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:28:22,291 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:28:22,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:28:22,291 INFO L85 PathProgramCache]: Analyzing trace with hash -135791605, now seen corresponding path program 23 times [2022-07-12 18:28:22,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:28:22,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502344190] [2022-07-12 18:28:22,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:28:22,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:28:22,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:28:23,272 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 516 proven. 497 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:23,272 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:28:23,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502344190] [2022-07-12 18:28:23,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502344190] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:28:23,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680784562] [2022-07-12 18:28:23,273 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-12 18:28:23,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:28:23,273 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:28:23,274 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:28:23,274 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-07-12 18:28:23,485 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2022-07-12 18:28:23,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:28:23,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 126 conjunts are in the unsatisfiable core [2022-07-12 18:28:23,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:28:23,500 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:28:25,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 578 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:25,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:28:27,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 578 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:27,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680784562] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:28:27,142 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:28:27,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 124 [2022-07-12 18:28:27,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933741071] [2022-07-12 18:28:27,142 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:28:27,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-07-12 18:28:27,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:28:27,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-07-12 18:28:27,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1937, Invalid=13315, Unknown=0, NotChecked=0, Total=15252 [2022-07-12 18:28:27,145 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand has 124 states, 123 states have (on average 2.4227642276422765) internal successors, (298), 89 states have internal predecessors, (298), 37 states have call successors, (37), 36 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:27,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:28:27,908 INFO L93 Difference]: Finished difference Result 213 states and 214 transitions. [2022-07-12 18:28:27,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-07-12 18:28:27,908 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 123 states have (on average 2.4227642276422765) internal successors, (298), 89 states have internal predecessors, (298), 37 states have call successors, (37), 36 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2022-07-12 18:28:27,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:28:27,909 INFO L225 Difference]: With dead ends: 213 [2022-07-12 18:28:27,909 INFO L226 Difference]: Without dead ends: 145 [2022-07-12 18:28:27,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 203 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6336 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2729, Invalid=17293, Unknown=0, NotChecked=0, Total=20022 [2022-07-12 18:28:27,910 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 228 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 806 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-12 18:28:27,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 289 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 806 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-12 18:28:27,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2022-07-12 18:28:27,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 142. [2022-07-12 18:28:27,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 18 states have call successors, (18), 18 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:27,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2022-07-12 18:28:27,914 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 137 [2022-07-12 18:28:27,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:28:27,914 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2022-07-12 18:28:27,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 123 states have (on average 2.4227642276422765) internal successors, (298), 89 states have internal predecessors, (298), 37 states have call successors, (37), 36 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:27,914 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2022-07-12 18:28:27,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-07-12 18:28:27,923 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:28:27,923 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:28:27,943 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-07-12 18:28:28,135 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:28:28,136 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:28:28,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:28:28,136 INFO L85 PathProgramCache]: Analyzing trace with hash -1653346328, now seen corresponding path program 24 times [2022-07-12 18:28:28,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:28:28,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592176039] [2022-07-12 18:28:28,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:28:28,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:28:28,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:28:29,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 50 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:29,516 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:28:29,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592176039] [2022-07-12 18:28:29,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592176039] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:28:29,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326411303] [2022-07-12 18:28:29,516 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-12 18:28:29,516 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:28:29,516 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:28:29,517 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:28:29,520 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-07-12 18:28:30,078 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2022-07-12 18:28:30,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:28:30,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 178 conjunts are in the unsatisfiable core [2022-07-12 18:28:30,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:28:30,917 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 14 treesize of output 10 [2022-07-12 18:28:31,239 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 15 treesize of output 7 [2022-07-12 18:28:31,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 50 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:31,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:28:31,464 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 15 treesize of output 13 [2022-07-12 18:28:31,467 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 26 treesize of output 22 [2022-07-12 18:28:32,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 50 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:32,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1326411303] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:28:32,127 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:28:32,127 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 84 [2022-07-12 18:28:32,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116989335] [2022-07-12 18:28:32,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:28:32,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-07-12 18:28:32,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:28:32,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-07-12 18:28:32,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=6762, Unknown=0, NotChecked=0, Total=6972 [2022-07-12 18:28:32,128 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 84 states, 81 states have (on average 2.493827160493827) internal successors, (202), 65 states have internal predecessors, (202), 22 states have call successors, (22), 20 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:35,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:28:35,550 INFO L93 Difference]: Finished difference Result 218 states and 219 transitions. [2022-07-12 18:28:35,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-07-12 18:28:35,551 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 81 states have (on average 2.493827160493827) internal successors, (202), 65 states have internal predecessors, (202), 22 states have call successors, (22), 20 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 141 [2022-07-12 18:28:35,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:28:35,552 INFO L225 Difference]: With dead ends: 218 [2022-07-12 18:28:35,552 INFO L226 Difference]: Without dead ends: 149 [2022-07-12 18:28:35,552 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 242 SyntacticMatches, 13 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1535 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=393, Invalid=13887, Unknown=0, NotChecked=0, Total=14280 [2022-07-12 18:28:35,553 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 104 mSDsluCounter, 2288 mSDsCounter, 0 mSdLazyCounter, 6658 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 2342 SdHoareTripleChecker+Invalid, 6755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 6658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 78 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-07-12 18:28:35,553 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 2342 Invalid, 6755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 6658 Invalid, 0 Unknown, 78 Unchecked, 2.0s Time] [2022-07-12 18:28:35,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-07-12 18:28:35,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 146. [2022-07-12 18:28:35,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 18 states have call successors, (18), 18 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:35,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2022-07-12 18:28:35,556 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 141 [2022-07-12 18:28:35,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:28:35,556 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2022-07-12 18:28:35,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 81 states have (on average 2.493827160493827) internal successors, (202), 65 states have internal predecessors, (202), 22 states have call successors, (22), 20 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:35,557 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2022-07-12 18:28:35,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-07-12 18:28:35,557 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:28:35,558 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:28:35,576 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-07-12 18:28:35,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-07-12 18:28:35,760 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:28:35,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:28:35,760 INFO L85 PathProgramCache]: Analyzing trace with hash -235360955, now seen corresponding path program 25 times [2022-07-12 18:28:35,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:28:35,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387076628] [2022-07-12 18:28:35,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:28:35,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:28:35,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:28:37,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 435 proven. 704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:37,128 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:28:37,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387076628] [2022-07-12 18:28:37,128 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387076628] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:28:37,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604403437] [2022-07-12 18:28:37,129 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-12 18:28:37,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:28:37,129 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:28:37,130 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:28:37,130 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-07-12 18:28:37,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:28:37,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 165 conjunts are in the unsatisfiable core [2022-07-12 18:28:37,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:28:38,248 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 496 proven. 643 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:38,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:28:40,259 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 5 treesize of output 3 [2022-07-12 18:28:40,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 496 proven. 643 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:40,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604403437] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:28:40,356 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:28:40,357 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 57, 57] total 116 [2022-07-12 18:28:40,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912511504] [2022-07-12 18:28:40,357 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:28:40,357 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2022-07-12 18:28:40,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:28:40,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2022-07-12 18:28:40,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=12555, Unknown=0, NotChecked=0, Total=13572 [2022-07-12 18:28:40,359 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand has 117 states, 113 states have (on average 2.256637168141593) internal successors, (255), 80 states have internal predecessors, (255), 38 states have call successors, (38), 37 states have call predecessors, (38), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:42,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:28:42,806 INFO L93 Difference]: Finished difference Result 152 states and 153 transitions. [2022-07-12 18:28:42,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-07-12 18:28:42,806 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 113 states have (on average 2.256637168141593) internal successors, (255), 80 states have internal predecessors, (255), 38 states have call successors, (38), 37 states have call predecessors, (38), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2022-07-12 18:28:42,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:28:42,807 INFO L225 Difference]: With dead ends: 152 [2022-07-12 18:28:42,807 INFO L226 Difference]: Without dead ends: 152 [2022-07-12 18:28:42,808 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 227 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5030 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1475, Invalid=16885, Unknown=0, NotChecked=0, Total=18360 [2022-07-12 18:28:42,808 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 316 mSDsluCounter, 1849 mSDsCounter, 0 mSdLazyCounter, 5541 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 1908 SdHoareTripleChecker+Invalid, 5567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 5541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-07-12 18:28:42,808 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [316 Valid, 1908 Invalid, 5567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 5541 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-07-12 18:28:42,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-07-12 18:28:42,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2022-07-12 18:28:42,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 130 states have internal predecessors, (132), 19 states have call successors, (19), 19 states have call predecessors, (19), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:42,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2022-07-12 18:28:42,812 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 145 [2022-07-12 18:28:42,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:28:42,813 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2022-07-12 18:28:42,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 113 states have (on average 2.256637168141593) internal successors, (255), 80 states have internal predecessors, (255), 38 states have call successors, (38), 37 states have call predecessors, (38), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:28:42,814 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2022-07-12 18:28:42,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-07-12 18:28:42,814 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:28:42,814 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:28:42,832 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-07-12 18:28:43,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-07-12 18:28:43,019 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:28:43,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:28:43,020 INFO L85 PathProgramCache]: Analyzing trace with hash -1080124372, now seen corresponding path program 26 times [2022-07-12 18:28:43,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:28:43,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773343463] [2022-07-12 18:28:43,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:28:43,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:28:43,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:28:44,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 53 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:44,592 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:28:44,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773343463] [2022-07-12 18:28:44,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773343463] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:28:44,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803671553] [2022-07-12 18:28:44,592 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-12 18:28:44,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:28:44,592 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:28:44,595 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:28:44,596 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-07-12 18:28:44,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-12 18:28:44,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:28:44,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 595 conjuncts, 180 conjunts are in the unsatisfiable core [2022-07-12 18:28:44,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:28:45,562 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 14 treesize of output 10 [2022-07-12 18:28:49,621 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:28:49,621 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 18 treesize of output 18 [2022-07-12 18:28:50,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 496 proven. 713 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:50,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:28:54,968 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 15 treesize of output 13 [2022-07-12 18:28:54,971 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 16 treesize of output 12 [2022-07-12 18:28:54,974 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 26 treesize of output 22 [2022-07-12 18:28:55,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 496 proven. 713 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:28:55,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803671553] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:28:55,075 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:28:55,075 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 61, 61] total 162 [2022-07-12 18:28:55,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025879557] [2022-07-12 18:28:55,075 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:28:55,076 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 162 states [2022-07-12 18:28:55,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:28:55,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2022-07-12 18:28:55,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1063, Invalid=25019, Unknown=0, NotChecked=0, Total=26082 [2022-07-12 18:28:55,078 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand has 162 states, 157 states have (on average 2.0) internal successors, (314), 106 states have internal predecessors, (314), 57 states have call successors, (57), 57 states have call predecessors, (57), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:04,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:29:04,562 INFO L93 Difference]: Finished difference Result 236 states and 237 transitions. [2022-07-12 18:29:04,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-07-12 18:29:04,563 INFO L78 Accepts]: Start accepts. Automaton has has 162 states, 157 states have (on average 2.0) internal successors, (314), 106 states have internal predecessors, (314), 57 states have call successors, (57), 57 states have call predecessors, (57), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 149 [2022-07-12 18:29:04,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:29:04,564 INFO L225 Difference]: With dead ends: 236 [2022-07-12 18:29:04,564 INFO L226 Difference]: Without dead ends: 163 [2022-07-12 18:29:04,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 227 SyntacticMatches, 3 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5910 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=1776, Invalid=40454, Unknown=0, NotChecked=0, Total=42230 [2022-07-12 18:29:04,567 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 146 mSDsluCounter, 3050 mSDsCounter, 0 mSdLazyCounter, 4459 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 3110 SdHoareTripleChecker+Invalid, 6584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 4459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2102 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-07-12 18:29:04,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 3110 Invalid, 6584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 4459 Invalid, 0 Unknown, 2102 Unchecked, 1.5s Time] [2022-07-12 18:29:04,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-07-12 18:29:04,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 158. [2022-07-12 18:29:04,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 137 states have (on average 1.0145985401459854) internal successors, (139), 137 states have internal predecessors, (139), 20 states have call successors, (20), 20 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:04,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2022-07-12 18:29:04,570 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 149 [2022-07-12 18:29:04,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:29:04,571 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2022-07-12 18:29:04,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 162 states, 157 states have (on average 2.0) internal successors, (314), 106 states have internal predecessors, (314), 57 states have call successors, (57), 57 states have call predecessors, (57), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:04,571 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2022-07-12 18:29:04,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-07-12 18:29:04,572 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:29:04,572 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:29:04,591 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-07-12 18:29:04,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-07-12 18:29:04,783 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:29:04,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:29:04,784 INFO L85 PathProgramCache]: Analyzing trace with hash 1765759344, now seen corresponding path program 27 times [2022-07-12 18:29:04,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:29:04,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055224270] [2022-07-12 18:29:04,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:29:04,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:29:04,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:29:06,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 56 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:06,499 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:29:06,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055224270] [2022-07-12 18:29:06,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055224270] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:29:06,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241932883] [2022-07-12 18:29:06,500 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-12 18:29:06,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:29:06,500 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:29:06,501 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:29:06,502 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-07-12 18:29:07,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-07-12 18:29:07,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:29:07,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 200 conjunts are in the unsatisfiable core [2022-07-12 18:29:07,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:29:08,258 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 14 treesize of output 10 [2022-07-12 18:29:08,636 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 15 treesize of output 7 [2022-07-12 18:29:08,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 56 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:08,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:29:08,907 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 15 treesize of output 13 [2022-07-12 18:29:08,908 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 26 treesize of output 22 [2022-07-12 18:29:09,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 56 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:09,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241932883] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:29:09,661 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:29:09,661 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 92 [2022-07-12 18:29:09,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140609116] [2022-07-12 18:29:09,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:29:09,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-07-12 18:29:09,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:29:09,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-07-12 18:29:09,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=8144, Unknown=0, NotChecked=0, Total=8372 [2022-07-12 18:29:09,662 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand has 92 states, 89 states have (on average 2.5168539325842696) internal successors, (224), 71 states have internal predecessors, (224), 24 states have call successors, (24), 22 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:13,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:29:13,949 INFO L93 Difference]: Finished difference Result 242 states and 243 transitions. [2022-07-12 18:29:13,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-07-12 18:29:13,950 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 89 states have (on average 2.5168539325842696) internal successors, (224), 71 states have internal predecessors, (224), 24 states have call successors, (24), 22 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 157 [2022-07-12 18:29:13,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:29:13,950 INFO L225 Difference]: With dead ends: 242 [2022-07-12 18:29:13,950 INFO L226 Difference]: Without dead ends: 165 [2022-07-12 18:29:13,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 272 SyntacticMatches, 13 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1790 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=429, Invalid=16863, Unknown=0, NotChecked=0, Total=17292 [2022-07-12 18:29:13,951 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 110 mSDsluCounter, 2728 mSDsCounter, 0 mSdLazyCounter, 7974 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 2788 SdHoareTripleChecker+Invalid, 8082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 7974 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-07-12 18:29:13,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 2788 Invalid, 8082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 7974 Invalid, 0 Unknown, 88 Unchecked, 2.5s Time] [2022-07-12 18:29:13,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2022-07-12 18:29:13,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 162. [2022-07-12 18:29:13,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 141 states have (on average 1.0141843971631206) internal successors, (143), 141 states have internal predecessors, (143), 20 states have call successors, (20), 20 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:13,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2022-07-12 18:29:13,954 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 157 [2022-07-12 18:29:13,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:29:13,955 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2022-07-12 18:29:13,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 89 states have (on average 2.5168539325842696) internal successors, (224), 71 states have internal predecessors, (224), 24 states have call successors, (24), 22 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:13,955 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2022-07-12 18:29:13,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-07-12 18:29:13,956 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:29:13,956 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:29:13,983 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-07-12 18:29:14,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:29:14,174 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:29:14,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:29:14,175 INFO L85 PathProgramCache]: Analyzing trace with hash -329270067, now seen corresponding path program 28 times [2022-07-12 18:29:14,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:29:14,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557202088] [2022-07-12 18:29:14,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:29:14,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:29:14,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:29:15,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 561 proven. 864 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:15,750 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:29:15,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557202088] [2022-07-12 18:29:15,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557202088] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:29:15,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1916515619] [2022-07-12 18:29:15,751 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-12 18:29:15,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:29:15,751 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:29:15,756 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:29:15,757 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-07-12 18:29:15,911 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-12 18:29:15,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:29:15,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 196 conjunts are in the unsatisfiable core [2022-07-12 18:29:15,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:29:15,924 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:29:17,306 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 16 treesize of output 12 [2022-07-12 18:29:20,798 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-12 18:29:20,798 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 19 treesize of output 19 [2022-07-12 18:29:21,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 648 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:21,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:29:26,401 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 15 treesize of output 13 [2022-07-12 18:29:26,403 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 26 treesize of output 22 [2022-07-12 18:29:30,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 703 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:30,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1916515619] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:29:30,374 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:29:30,374 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 65, 65] total 189 [2022-07-12 18:29:30,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936160705] [2022-07-12 18:29:30,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:29:30,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2022-07-12 18:29:30,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:29:30,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2022-07-12 18:29:30,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2206, Invalid=33704, Unknown=0, NotChecked=0, Total=35910 [2022-07-12 18:29:30,377 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand has 190 states, 185 states have (on average 2.254054054054054) internal successors, (417), 130 states have internal predecessors, (417), 60 states have call successors, (60), 60 states have call predecessors, (60), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:38,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:29:38,499 INFO L93 Difference]: Finished difference Result 172 states and 173 transitions. [2022-07-12 18:29:38,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-07-12 18:29:38,499 INFO L78 Accepts]: Start accepts. Automaton has has 190 states, 185 states have (on average 2.254054054054054) internal successors, (417), 130 states have internal predecessors, (417), 60 states have call successors, (60), 60 states have call predecessors, (60), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 161 [2022-07-12 18:29:38,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:29:38,504 INFO L225 Difference]: With dead ends: 172 [2022-07-12 18:29:38,504 INFO L226 Difference]: Without dead ends: 172 [2022-07-12 18:29:38,506 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9786 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=3448, Invalid=52958, Unknown=0, NotChecked=0, Total=56406 [2022-07-12 18:29:38,507 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 682 mSDsluCounter, 2878 mSDsCounter, 0 mSdLazyCounter, 8550 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 682 SdHoareTripleChecker+Valid, 2942 SdHoareTripleChecker+Invalid, 8800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 8550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 199 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-07-12 18:29:38,507 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [682 Valid, 2942 Invalid, 8800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 8550 Invalid, 0 Unknown, 199 Unchecked, 3.2s Time] [2022-07-12 18:29:38,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-07-12 18:29:38,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 170. [2022-07-12 18:29:38,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 147 states have (on average 1.0136054421768708) internal successors, (149), 147 states have internal predecessors, (149), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:38,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2022-07-12 18:29:38,510 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 161 [2022-07-12 18:29:38,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:29:38,511 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2022-07-12 18:29:38,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 190 states, 185 states have (on average 2.254054054054054) internal successors, (417), 130 states have internal predecessors, (417), 60 states have call successors, (60), 60 states have call predecessors, (60), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:38,511 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2022-07-12 18:29:38,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2022-07-12 18:29:38,512 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:29:38,512 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:29:38,535 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-07-12 18:29:38,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-07-12 18:29:38,727 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:29:38,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:29:38,728 INFO L85 PathProgramCache]: Analyzing trace with hash -1013463269, now seen corresponding path program 29 times [2022-07-12 18:29:38,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:29:38,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117293946] [2022-07-12 18:29:38,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:29:38,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:29:38,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:29:40,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1585 backedges. 804 proven. 781 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:40,127 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:29:40,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117293946] [2022-07-12 18:29:40,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1117293946] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:29:40,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507545570] [2022-07-12 18:29:40,127 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-12 18:29:40,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:29:40,127 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:29:40,128 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:29:40,129 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-07-12 18:29:40,460 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2022-07-12 18:29:40,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:29:40,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 154 conjunts are in the unsatisfiable core [2022-07-12 18:29:40,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:29:40,475 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2022-07-12 18:29:44,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1585 backedges. 882 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:44,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:29:46,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1585 backedges. 882 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:46,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [507545570] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:29:46,034 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:29:46,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65, 65] total 152 [2022-07-12 18:29:46,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510859552] [2022-07-12 18:29:46,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:29:46,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2022-07-12 18:29:46,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:29:46,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2022-07-12 18:29:46,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2893, Invalid=20059, Unknown=0, NotChecked=0, Total=22952 [2022-07-12 18:29:46,037 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand has 152 states, 151 states have (on average 2.4503311258278146) internal successors, (370), 109 states have internal predecessors, (370), 45 states have call successors, (45), 44 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:47,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:29:47,193 INFO L93 Difference]: Finished difference Result 261 states and 262 transitions. [2022-07-12 18:29:47,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-07-12 18:29:47,194 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 151 states have (on average 2.4503311258278146) internal successors, (370), 109 states have internal predecessors, (370), 45 states have call successors, (45), 44 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 169 [2022-07-12 18:29:47,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:29:47,194 INFO L225 Difference]: With dead ends: 261 [2022-07-12 18:29:47,194 INFO L226 Difference]: Without dead ends: 177 [2022-07-12 18:29:47,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 251 SyntacticMatches, 1 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9680 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=4079, Invalid=26023, Unknown=0, NotChecked=0, Total=30102 [2022-07-12 18:29:47,196 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 168 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 1209 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 1222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-12 18:29:47,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 434 Invalid, 1222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1209 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-07-12 18:29:47,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2022-07-12 18:29:47,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 174. [2022-07-12 18:29:47,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 151 states have (on average 1.0132450331125828) internal successors, (153), 151 states have internal predecessors, (153), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:47,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2022-07-12 18:29:47,199 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 169 [2022-07-12 18:29:47,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:29:47,199 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2022-07-12 18:29:47,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 151 states have (on average 2.4503311258278146) internal successors, (370), 109 states have internal predecessors, (370), 45 states have call successors, (45), 44 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:47,200 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2022-07-12 18:29:47,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-07-12 18:29:47,201 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:29:47,201 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:29:47,219 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-07-12 18:29:47,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-07-12 18:29:47,403 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:29:47,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:29:47,404 INFO L85 PathProgramCache]: Analyzing trace with hash -405469448, now seen corresponding path program 30 times [2022-07-12 18:29:47,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:29:47,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165641837] [2022-07-12 18:29:47,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:29:47,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:29:47,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:29:49,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1662 backedges. 62 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:49,525 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:29:49,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165641837] [2022-07-12 18:29:49,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165641837] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:29:49,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272172835] [2022-07-12 18:29:49,526 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-12 18:29:49,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:29:49,526 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:29:49,527 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:29:49,528 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-07-12 18:29:50,394 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2022-07-12 18:29:50,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:29:50,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 220 conjunts are in the unsatisfiable core [2022-07-12 18:29:50,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:29:51,697 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 14 treesize of output 10 [2022-07-12 18:29:52,191 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 15 treesize of output 7 [2022-07-12 18:29:52,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1662 backedges. 62 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:52,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:29:52,493 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 15 treesize of output 13 [2022-07-12 18:29:52,495 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 26 treesize of output 22 [2022-07-12 18:29:53,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1662 backedges. 62 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:29:53,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272172835] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:29:53,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:29:53,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 100 [2022-07-12 18:29:53,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543702226] [2022-07-12 18:29:53,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:29:53,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-07-12 18:29:53,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:29:53,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-07-12 18:29:53,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=9654, Unknown=0, NotChecked=0, Total=9900 [2022-07-12 18:29:53,347 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand has 100 states, 97 states have (on average 2.536082474226804) internal successors, (246), 77 states have internal predecessors, (246), 26 states have call successors, (26), 24 states have call predecessors, (26), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:58,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:29:58,679 INFO L93 Difference]: Finished difference Result 266 states and 267 transitions. [2022-07-12 18:29:58,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-07-12 18:29:58,680 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 97 states have (on average 2.536082474226804) internal successors, (246), 77 states have internal predecessors, (246), 26 states have call successors, (26), 24 states have call predecessors, (26), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 173 [2022-07-12 18:29:58,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:29:58,680 INFO L225 Difference]: With dead ends: 266 [2022-07-12 18:29:58,680 INFO L226 Difference]: Without dead ends: 181 [2022-07-12 18:29:58,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 302 SyntacticMatches, 13 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2065 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=465, Invalid=20127, Unknown=0, NotChecked=0, Total=20592 [2022-07-12 18:29:58,681 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 134 mSDsluCounter, 3410 mSDsCounter, 0 mSdLazyCounter, 9939 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 3476 SdHoareTripleChecker+Invalid, 10085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 9939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 122 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-07-12 18:29:58,682 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 3476 Invalid, 10085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 9939 Invalid, 0 Unknown, 122 Unchecked, 3.2s Time] [2022-07-12 18:29:58,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-07-12 18:29:58,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 178. [2022-07-12 18:29:58,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 155 states have (on average 1.0129032258064516) internal successors, (157), 155 states have internal predecessors, (157), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:58,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2022-07-12 18:29:58,684 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 173 [2022-07-12 18:29:58,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:29:58,685 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2022-07-12 18:29:58,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 97 states have (on average 2.536082474226804) internal successors, (246), 77 states have internal predecessors, (246), 26 states have call successors, (26), 24 states have call predecessors, (26), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:29:58,685 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2022-07-12 18:29:58,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2022-07-12 18:29:58,686 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:29:58,686 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:29:58,709 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-07-12 18:29:58,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-07-12 18:29:58,899 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:29:58,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:29:58,900 INFO L85 PathProgramCache]: Analyzing trace with hash 696586325, now seen corresponding path program 31 times [2022-07-12 18:29:58,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:29:58,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922998947] [2022-07-12 18:29:58,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:29:58,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:29:58,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:30:00,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 703 proven. 1040 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:30:00,781 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:30:00,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922998947] [2022-07-12 18:30:00,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922998947] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:30:00,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465239041] [2022-07-12 18:30:00,781 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-12 18:30:00,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:30:00,781 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:30:00,782 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:30:00,783 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-07-12 18:30:00,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:30:00,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 201 conjunts are in the unsatisfiable core [2022-07-12 18:30:00,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:30:02,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 780 proven. 963 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:30:02,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 18:30:05,894 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 5 treesize of output 3 [2022-07-12 18:30:06,051 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 780 proven. 963 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:30:06,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465239041] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 18:30:06,051 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 18:30:06,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 69, 69] total 139 [2022-07-12 18:30:06,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294753281] [2022-07-12 18:30:06,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 18:30:06,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2022-07-12 18:30:06,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 18:30:06,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2022-07-12 18:30:06,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1219, Invalid=18241, Unknown=0, NotChecked=0, Total=19460 [2022-07-12 18:30:06,056 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand has 140 states, 137 states have (on average 2.27007299270073) internal successors, (311), 95 states have internal predecessors, (311), 46 states have call successors, (46), 45 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:30:10,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 18:30:10,910 INFO L93 Difference]: Finished difference Result 184 states and 185 transitions. [2022-07-12 18:30:10,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-07-12 18:30:10,910 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 137 states have (on average 2.27007299270073) internal successors, (311), 95 states have internal predecessors, (311), 46 states have call successors, (46), 45 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 177 [2022-07-12 18:30:10,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 18:30:10,911 INFO L225 Difference]: With dead ends: 184 [2022-07-12 18:30:10,911 INFO L226 Difference]: Without dead ends: 184 [2022-07-12 18:30:10,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 279 SyntacticMatches, 2 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6609 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=2554, Invalid=30752, Unknown=0, NotChecked=0, Total=33306 [2022-07-12 18:30:10,913 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 517 mSDsluCounter, 2788 mSDsCounter, 0 mSdLazyCounter, 8365 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 517 SdHoareTripleChecker+Valid, 2859 SdHoareTripleChecker+Invalid, 8394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 8365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-07-12 18:30:10,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [517 Valid, 2859 Invalid, 8394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 8365 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-07-12 18:30:10,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-07-12 18:30:10,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 182. [2022-07-12 18:30:10,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 158 states have (on average 1.0126582278481013) internal successors, (160), 158 states have internal predecessors, (160), 23 states have call successors, (23), 23 states have call predecessors, (23), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:30:10,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2022-07-12 18:30:10,917 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 177 [2022-07-12 18:30:10,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 18:30:10,917 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2022-07-12 18:30:10,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 137 states have (on average 2.27007299270073) internal successors, (311), 95 states have internal predecessors, (311), 46 states have call successors, (46), 45 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 18:30:10,917 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2022-07-12 18:30:10,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2022-07-12 18:30:10,918 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 18:30:10,918 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 18:30:10,936 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-07-12 18:30:11,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:30:11,123 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-12 18:30:11,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 18:30:11,124 INFO L85 PathProgramCache]: Analyzing trace with hash -987564228, now seen corresponding path program 32 times [2022-07-12 18:30:11,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 18:30:11,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326539182] [2022-07-12 18:30:11,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 18:30:11,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 18:30:11,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 18:30:13,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1829 backedges. 65 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 18:30:13,345 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 18:30:13,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326539182] [2022-07-12 18:30:13,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326539182] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 18:30:13,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465468656] [2022-07-12 18:30:13,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-12 18:30:13,346 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 18:30:13,346 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 18:30:13,348 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 18:30:13,348 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-07-12 18:30:13,526 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-12 18:30:13,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-12 18:30:13,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 719 conjuncts, 216 conjunts are in the unsatisfiable core [2022-07-12 18:30:13,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 18:30:14,775 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 14 treesize of output 10