./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 e19ca921 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-dev-e19ca92 [2021-12-21 23:59:54,980 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 23:59:54,986 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 23:59:55,056 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 23:59:55,056 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 23:59:55,059 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 23:59:55,060 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 23:59:55,065 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 23:59:55,065 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 23:59:55,066 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 23:59:55,067 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 23:59:55,068 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 23:59:55,068 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 23:59:55,071 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 23:59:55,072 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 23:59:55,072 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 23:59:55,075 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 23:59:55,079 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 23:59:55,080 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 23:59:55,082 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 23:59:55,092 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 23:59:55,093 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 23:59:55,093 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 23:59:55,094 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 23:59:55,095 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 23:59:55,095 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 23:59:55,096 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 23:59:55,096 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 23:59:55,096 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 23:59:55,097 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 23:59:55,097 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 23:59:55,098 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 23:59:55,098 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 23:59:55,099 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 23:59:55,099 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 23:59:55,099 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 23:59:55,100 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 23:59:55,100 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 23:59:55,101 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 23:59:55,102 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 23:59:55,102 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 23:59:55,103 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-21 23:59:55,118 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 23:59:55,120 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 23:59:55,120 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 23:59:55,120 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 23:59:55,121 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 23:59:55,121 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 23:59:55,121 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 23:59:55,122 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 23:59:55,122 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 23:59:55,122 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 23:59:55,123 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 23:59:55,123 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-21 23:59:55,123 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 23:59:55,123 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 23:59:55,123 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 23:59:55,123 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-21 23:59:55,123 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-21 23:59:55,124 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-21 23:59:55,124 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 23:59:55,124 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-21 23:59:55,124 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 23:59:55,124 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 23:59:55,124 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 23:59:55,124 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 23:59:55,124 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 23:59:55,125 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 23:59:55,125 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 23:59:55,126 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 23:59:55,126 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 23:59:55,126 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 23:59:55,126 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 23:59:55,126 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 60396cce4fa0936fb91e88a54a287214045469c9d9b3d447954681e0a5aabbc0 [2021-12-21 23:59:55,326 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 23:59:55,353 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 23:59:55,359 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 23:59:55,360 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 23:59:55,375 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 23:59:55,376 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2021-12-21 23:59:55,417 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be9ba9a5b/b6447aab616c42829933a3af82aec0b3/FLAG5e78ee9c6 [2021-12-21 23:59:55,859 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 23:59:55,859 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2021-12-21 23:59:55,866 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be9ba9a5b/b6447aab616c42829933a3af82aec0b3/FLAG5e78ee9c6 [2021-12-21 23:59:55,876 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be9ba9a5b/b6447aab616c42829933a3af82aec0b3 [2021-12-21 23:59:55,878 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 23:59:55,879 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 23:59:55,881 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 23:59:55,881 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 23:59:55,883 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 23:59:55,884 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 11:59:55" (1/1) ... [2021-12-21 23:59:55,885 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74ab4904 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:55, skipping insertion in model container [2021-12-21 23:59:55,885 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 11:59:55" (1/1) ... [2021-12-21 23:59:55,890 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 23:59:55,908 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 23:59:56,115 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 23:59:56,121 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 23:59:56,146 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 23:59:56,162 INFO L208 MainTranslator]: Completed translation [2021-12-21 23:59:56,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56 WrapperNode [2021-12-21 23:59:56,163 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 23:59:56,163 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 23:59:56,163 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 23:59:56,164 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 23:59:56,168 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,175 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,186 INFO L137 Inliner]: procedures = 117, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 29 [2021-12-21 23:59:56,186 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 23:59:56,187 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 23:59:56,187 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 23:59:56,187 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 23:59:56,191 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,191 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,193 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,194 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,196 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,198 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,199 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,200 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 23:59:56,201 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 23:59:56,201 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 23:59:56,201 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 23:59:56,202 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (1/1) ... [2021-12-21 23:59:56,206 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 23:59:56,217 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 23:59:56,237 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) [2021-12-21 23:59:56,246 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 [2021-12-21 23:59:56,265 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-21 23:59:56,265 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-21 23:59:56,265 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-21 23:59:56,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-21 23:59:56,265 INFO L130 BoogieDeclarations]: Found specification of procedure strlen_rec [2021-12-21 23:59:56,266 INFO L138 BoogieDeclarations]: Found implementation of procedure strlen_rec [2021-12-21 23:59:56,266 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 23:59:56,266 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 23:59:56,337 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 23:59:56,338 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 23:59:56,472 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 23:59:56,476 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 23:59:56,476 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-21 23:59:56,498 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 11:59:56 BoogieIcfgContainer [2021-12-21 23:59:56,499 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 23:59:56,500 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 23:59:56,500 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 23:59:56,502 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 23:59:56,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 11:59:55" (1/3) ... [2021-12-21 23:59:56,516 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30d5e3cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 11:59:56, skipping insertion in model container [2021-12-21 23:59:56,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 11:59:56" (2/3) ... [2021-12-21 23:59:56,516 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30d5e3cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 11:59:56, skipping insertion in model container [2021-12-21 23:59:56,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 11:59:56" (3/3) ... [2021-12-21 23:59:56,517 INFO L111 eAbstractionObserver]: Analyzing ICFG rec_strlen-alloca-1.i [2021-12-21 23:59:56,520 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 23:59:56,520 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 7 error locations. [2021-12-21 23:59:56,562 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 23:59:56,579 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 23:59:56,580 INFO L340 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2021-12-21 23:59:56,604 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) [2021-12-21 23:59:56,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-21 23:59:56,608 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:56,608 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-21 23:59:56,608 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:56,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:56,612 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2021-12-21 23:59:56,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:56,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539228380] [2021-12-21 23:59:56,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:56,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:56,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:56,770 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:56,770 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:56,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539228380] [2021-12-21 23:59:56,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539228380] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 23:59:56,772 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 23:59:56,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 23:59:56,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428545272] [2021-12-21 23:59:56,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 23:59:56,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 23:59:56,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:56,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 23:59:56,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-21 23:59:56,800 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) [2021-12-21 23:59:56,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:56,849 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-12-21 23:59:56,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 23:59:56,851 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 [2021-12-21 23:59:56,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:56,856 INFO L225 Difference]: With dead ends: 39 [2021-12-21 23:59:56,856 INFO L226 Difference]: Without dead ends: 35 [2021-12-21 23:59:56,858 INFO L932 BasicCegarLoop]: 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 [2021-12-21 23:59:56,862 INFO L933 BasicCegarLoop]: 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 [2021-12-21 23:59:56,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 71 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 23:59:56,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-12-21 23:59:56,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-12-21 23:59:56,952 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) [2021-12-21 23:59:56,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-12-21 23:59:56,954 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 6 [2021-12-21 23:59:56,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:56,954 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-12-21 23:59:56,955 INFO L471 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) [2021-12-21 23:59:56,955 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-12-21 23:59:56,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-21 23:59:56,955 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:56,956 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-21 23:59:56,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 23:59:56,956 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:56,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:56,959 INFO L85 PathProgramCache]: Analyzing trace with hash 889508820, now seen corresponding path program 1 times [2021-12-21 23:59:56,959 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:56,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358288925] [2021-12-21 23:59:56,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:56,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:56,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:57,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:57,014 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:57,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358288925] [2021-12-21 23:59:57,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358288925] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 23:59:57,015 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 23:59:57,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 23:59:57,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244487403] [2021-12-21 23:59:57,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 23:59:57,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 23:59:57,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:57,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 23:59:57,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 23:59:57,018 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) [2021-12-21 23:59:57,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:57,036 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2021-12-21 23:59:57,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 23:59:57,037 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 [2021-12-21 23:59:57,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:57,038 INFO L225 Difference]: With dead ends: 26 [2021-12-21 23:59:57,038 INFO L226 Difference]: Without dead ends: 26 [2021-12-21 23:59:57,039 INFO L932 BasicCegarLoop]: 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 [2021-12-21 23:59:57,043 INFO L933 BasicCegarLoop]: 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 [2021-12-21 23:59:57,043 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 32 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 23:59:57,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-12-21 23:59:57,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-12-21 23:59:57,048 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) [2021-12-21 23:59:57,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-12-21 23:59:57,049 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 6 [2021-12-21 23:59:57,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:57,050 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-12-21 23:59:57,051 INFO L471 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) [2021-12-21 23:59:57,051 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-12-21 23:59:57,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-21 23:59:57,051 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:57,052 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-21 23:59:57,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 23:59:57,055 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:57,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:57,055 INFO L85 PathProgramCache]: Analyzing trace with hash 889508821, now seen corresponding path program 1 times [2021-12-21 23:59:57,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:57,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096761739] [2021-12-21 23:59:57,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:57,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:57,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:57,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:57,104 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:57,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096761739] [2021-12-21 23:59:57,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2096761739] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 23:59:57,105 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 23:59:57,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 23:59:57,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048756755] [2021-12-21 23:59:57,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 23:59:57,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 23:59:57,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:57,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 23:59:57,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-21 23:59:57,107 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) [2021-12-21 23:59:57,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:57,131 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-12-21 23:59:57,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 23:59:57,131 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 [2021-12-21 23:59:57,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:57,132 INFO L225 Difference]: With dead ends: 25 [2021-12-21 23:59:57,132 INFO L226 Difference]: Without dead ends: 25 [2021-12-21 23:59:57,133 INFO L932 BasicCegarLoop]: 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 [2021-12-21 23:59:57,136 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 10 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 23:59:57,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 41 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 23:59:57,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-12-21 23:59:57,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-12-21 23:59:57,141 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) [2021-12-21 23:59:57,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-12-21 23:59:57,142 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 6 [2021-12-21 23:59:57,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:57,142 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-12-21 23:59:57,142 INFO L471 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) [2021-12-21 23:59:57,143 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-12-21 23:59:57,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-21 23:59:57,143 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:57,143 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-21 23:59:57,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-21 23:59:57,144 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:57,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:57,145 INFO L85 PathProgramCache]: Analyzing trace with hash 889568456, now seen corresponding path program 1 times [2021-12-21 23:59:57,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:57,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686197840] [2021-12-21 23:59:57,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:57,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:57,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:57,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:57,187 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:57,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686197840] [2021-12-21 23:59:57,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686197840] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 23:59:57,187 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 23:59:57,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 23:59:57,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204486349] [2021-12-21 23:59:57,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 23:59:57,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 23:59:57,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:57,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 23:59:57,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 23:59:57,189 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) [2021-12-21 23:59:57,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:57,222 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-12-21 23:59:57,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 23:59:57,222 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 [2021-12-21 23:59:57,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:57,223 INFO L225 Difference]: With dead ends: 34 [2021-12-21 23:59:57,223 INFO L226 Difference]: Without dead ends: 34 [2021-12-21 23:59:57,223 INFO L932 BasicCegarLoop]: 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 [2021-12-21 23:59:57,224 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 23 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 23:59:57,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 48 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 23:59:57,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-12-21 23:59:57,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2021-12-21 23:59:57,227 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) [2021-12-21 23:59:57,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-12-21 23:59:57,227 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 6 [2021-12-21 23:59:57,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:57,228 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-12-21 23:59:57,228 INFO L471 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) [2021-12-21 23:59:57,228 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-12-21 23:59:57,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-21 23:59:57,228 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:57,228 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 23:59:57,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-21 23:59:57,229 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting strlen_recErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:57,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:57,229 INFO L85 PathProgramCache]: Analyzing trace with hash -590943170, now seen corresponding path program 1 times [2021-12-21 23:59:57,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:57,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639988439] [2021-12-21 23:59:57,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:57,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:57,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:57,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:57,258 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:57,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639988439] [2021-12-21 23:59:57,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639988439] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 23:59:57,259 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 23:59:57,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 23:59:57,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033649683] [2021-12-21 23:59:57,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 23:59:57,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 23:59:57,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:57,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 23:59:57,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 23:59:57,261 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) [2021-12-21 23:59:57,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:57,290 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-12-21 23:59:57,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 23:59:57,291 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 [2021-12-21 23:59:57,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:57,292 INFO L225 Difference]: With dead ends: 26 [2021-12-21 23:59:57,292 INFO L226 Difference]: Without dead ends: 26 [2021-12-21 23:59:57,292 INFO L932 BasicCegarLoop]: 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 [2021-12-21 23:59:57,293 INFO L933 BasicCegarLoop]: 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 [2021-12-21 23:59:57,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 34 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 23:59:57,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-12-21 23:59:57,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-12-21 23:59:57,295 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) [2021-12-21 23:59:57,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-12-21 23:59:57,296 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 9 [2021-12-21 23:59:57,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:57,296 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-12-21 23:59:57,296 INFO L471 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) [2021-12-21 23:59:57,296 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-12-21 23:59:57,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-21 23:59:57,297 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:57,297 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 23:59:57,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-21 23:59:57,297 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:57,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:57,298 INFO L85 PathProgramCache]: Analyzing trace with hash -590943169, now seen corresponding path program 1 times [2021-12-21 23:59:57,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:57,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990006134] [2021-12-21 23:59:57,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:57,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:57,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:57,348 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:57,349 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:57,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990006134] [2021-12-21 23:59:57,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [990006134] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 23:59:57,349 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 23:59:57,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 23:59:57,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115764443] [2021-12-21 23:59:57,350 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 23:59:57,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 23:59:57,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:57,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 23:59:57,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-21 23:59:57,351 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) [2021-12-21 23:59:57,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:57,394 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2021-12-21 23:59:57,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 23:59:57,395 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 [2021-12-21 23:59:57,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:57,395 INFO L225 Difference]: With dead ends: 33 [2021-12-21 23:59:57,395 INFO L226 Difference]: Without dead ends: 33 [2021-12-21 23:59:57,396 INFO L932 BasicCegarLoop]: 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 [2021-12-21 23:59:57,396 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 28 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 23:59:57,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 60 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 23:59:57,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-12-21 23:59:57,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-12-21 23:59:57,399 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) [2021-12-21 23:59:57,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2021-12-21 23:59:57,399 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 9 [2021-12-21 23:59:57,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:57,400 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2021-12-21 23:59:57,400 INFO L471 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) [2021-12-21 23:59:57,400 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2021-12-21 23:59:57,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-21 23:59:57,400 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:57,401 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 23:59:57,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-21 23:59:57,401 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:57,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:57,401 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2021-12-21 23:59:57,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:57,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319314316] [2021-12-21 23:59:57,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:57,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:57,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:57,457 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:57,458 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:57,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319314316] [2021-12-21 23:59:57,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319314316] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 23:59:57,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348441250] [2021-12-21 23:59:57,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:57,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 23:59:57,459 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 23:59:57,476 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) [2021-12-21 23:59:57,477 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 23:59:57,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:57,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 23:59:57,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 23:59:57,564 INFO L387 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 [2021-12-21 23:59:57,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:57,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 23:59:57,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:57,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348441250] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 23:59:57,744 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 23:59:57,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-12-21 23:59:57,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399440807] [2021-12-21 23:59:57,744 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 23:59:57,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 23:59:57,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:57,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 23:59:57,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-12-21 23:59:57,746 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) [2021-12-21 23:59:57,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:57,838 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-12-21 23:59:57,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 23:59:57,839 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 [2021-12-21 23:59:57,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:57,839 INFO L225 Difference]: With dead ends: 45 [2021-12-21 23:59:57,839 INFO L226 Difference]: Without dead ends: 45 [2021-12-21 23:59:57,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-12-21 23:59:57,840 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 34 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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 [2021-12-21 23:59:57,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 84 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 23:59:57,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-21 23:59:57,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 30. [2021-12-21 23:59:57,843 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) [2021-12-21 23:59:57,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-12-21 23:59:57,843 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 10 [2021-12-21 23:59:57,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:57,844 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-12-21 23:59:57,844 INFO L471 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) [2021-12-21 23:59:57,844 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-12-21 23:59:57,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 23:59:57,844 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:57,844 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 23:59:57,908 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-21 23:59:58,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 23:59:58,058 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:58,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:58,059 INFO L85 PathProgramCache]: Analyzing trace with hash 182504998, now seen corresponding path program 1 times [2021-12-21 23:59:58,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:58,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146772392] [2021-12-21 23:59:58,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:58,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:58,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:58,131 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:58,132 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:58,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146772392] [2021-12-21 23:59:58,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146772392] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 23:59:58,132 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 23:59:58,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-21 23:59:58,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494311226] [2021-12-21 23:59:58,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 23:59:58,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 23:59:58,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:58,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 23:59:58,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-12-21 23:59:58,133 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) [2021-12-21 23:59:58,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:58,188 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2021-12-21 23:59:58,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-21 23:59:58,188 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 [2021-12-21 23:59:58,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:58,189 INFO L225 Difference]: With dead ends: 40 [2021-12-21 23:59:58,189 INFO L226 Difference]: Without dead ends: 40 [2021-12-21 23:59:58,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-12-21 23:59:58,190 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 23:59:58,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 96 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 23:59:58,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-12-21 23:59:58,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2021-12-21 23:59:58,204 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) [2021-12-21 23:59:58,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-12-21 23:59:58,207 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 13 [2021-12-21 23:59:58,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:58,208 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-12-21 23:59:58,208 INFO L471 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) [2021-12-21 23:59:58,208 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-12-21 23:59:58,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 23:59:58,209 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:58,209 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 23:59:58,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-21 23:59:58,210 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:58,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:58,210 INFO L85 PathProgramCache]: Analyzing trace with hash 883569576, now seen corresponding path program 1 times [2021-12-21 23:59:58,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:58,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586890613] [2021-12-21 23:59:58,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:58,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:58,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:58,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:58,395 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:58,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586890613] [2021-12-21 23:59:58,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [586890613] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 23:59:58,395 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 23:59:58,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-21 23:59:58,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710371649] [2021-12-21 23:59:58,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 23:59:58,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-21 23:59:58,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:58,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-21 23:59:58,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-21 23:59:58,397 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) [2021-12-21 23:59:58,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:58,496 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-12-21 23:59:58,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 23:59:58,497 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 [2021-12-21 23:59:58,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:58,499 INFO L225 Difference]: With dead ends: 51 [2021-12-21 23:59:58,499 INFO L226 Difference]: Without dead ends: 51 [2021-12-21 23:59:58,499 INFO L932 BasicCegarLoop]: 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 [2021-12-21 23:59:58,501 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 23:59:58,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 92 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 23:59:58,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-21 23:59:58,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 38. [2021-12-21 23:59:58,508 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) [2021-12-21 23:59:58,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-12-21 23:59:58,509 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 13 [2021-12-21 23:59:58,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:58,510 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-12-21 23:59:58,510 INFO L471 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) [2021-12-21 23:59:58,510 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-12-21 23:59:58,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-21 23:59:58,510 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:58,510 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 23:59:58,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-12-21 23:59:58,511 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:58,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:58,511 INFO L85 PathProgramCache]: Analyzing trace with hash 1361686065, now seen corresponding path program 1 times [2021-12-21 23:59:58,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:58,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449220502] [2021-12-21 23:59:58,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:58,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:58,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:58,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 23:59:58,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:58,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:58,550 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:58,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449220502] [2021-12-21 23:59:58,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449220502] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 23:59:58,550 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 23:59:58,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 23:59:58,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767006472] [2021-12-21 23:59:58,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 23:59:58,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 23:59:58,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:58,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 23:59:58,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 23:59:58,552 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) [2021-12-21 23:59:58,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:58,568 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2021-12-21 23:59:58,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 23:59:58,568 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 [2021-12-21 23:59:58,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:58,569 INFO L225 Difference]: With dead ends: 37 [2021-12-21 23:59:58,569 INFO L226 Difference]: Without dead ends: 20 [2021-12-21 23:59:58,569 INFO L932 BasicCegarLoop]: 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 [2021-12-21 23:59:58,570 INFO L933 BasicCegarLoop]: 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 [2021-12-21 23:59:58,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 41 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 23:59:58,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-12-21 23:59:58,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-12-21 23:59:58,572 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) [2021-12-21 23:59:58,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-12-21 23:59:58,572 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2021-12-21 23:59:58,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:58,572 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-12-21 23:59:58,573 INFO L471 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) [2021-12-21 23:59:58,573 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-12-21 23:59:58,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-21 23:59:58,573 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:58,574 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 23:59:58,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-12-21 23:59:58,574 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:58,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:58,574 INFO L85 PathProgramCache]: Analyzing trace with hash 312590597, now seen corresponding path program 1 times [2021-12-21 23:59:58,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:58,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695499299] [2021-12-21 23:59:58,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:58,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:58,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:58,676 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:58,677 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:58,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695499299] [2021-12-21 23:59:58,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695499299] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 23:59:58,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21565528] [2021-12-21 23:59:58,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:58,677 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 23:59:58,677 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 23:59:58,691 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) [2021-12-21 23:59:58,745 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 23:59:58,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:58,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-21 23:59:58,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 23:59:58,884 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:58,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 23:59:59,031 INFO L387 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 [2021-12-21 23:59:59,061 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:59,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21565528] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 23:59:59,062 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 23:59:59,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 20 [2021-12-21 23:59:59,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237243663] [2021-12-21 23:59:59,063 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 23:59:59,063 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-21 23:59:59,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 23:59:59,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-21 23:59:59,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-12-21 23:59:59,065 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) [2021-12-21 23:59:59,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 23:59:59,220 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-12-21 23:59:59,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 23:59:59,221 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 [2021-12-21 23:59:59,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 23:59:59,221 INFO L225 Difference]: With dead ends: 27 [2021-12-21 23:59:59,221 INFO L226 Difference]: Without dead ends: 27 [2021-12-21 23:59:59,223 INFO L932 BasicCegarLoop]: 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 [2021-12-21 23:59:59,224 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 42 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 23:59:59,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 57 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 23:59:59,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-12-21 23:59:59,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 22. [2021-12-21 23:59:59,227 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) [2021-12-21 23:59:59,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-12-21 23:59:59,228 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-12-21 23:59:59,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 23:59:59,228 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-12-21 23:59:59,228 INFO L471 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) [2021-12-21 23:59:59,228 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-12-21 23:59:59,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-21 23:59:59,229 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 23:59:59,229 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 23:59:59,256 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 23:59:59,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-21 23:59:59,449 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 23:59:59,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 23:59:59,449 INFO L85 PathProgramCache]: Analyzing trace with hash 2048380908, now seen corresponding path program 2 times [2021-12-21 23:59:59,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 23:59:59,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753962874] [2021-12-21 23:59:59,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 23:59:59,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 23:59:59,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 23:59:59,615 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 23:59:59,615 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 23:59:59,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753962874] [2021-12-21 23:59:59,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753962874] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 23:59:59,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657892559] [2021-12-21 23:59:59,616 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 23:59:59,616 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 23:59:59,616 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 23:59:59,617 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) [2021-12-21 23:59:59,618 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 23:59:59,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 23:59:59,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 23:59:59,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-21 23:59:59,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 23:59:59,695 INFO L387 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 [2021-12-22 00:00:00,025 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 00:00:00,026 INFO L387 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 [2021-12-22 00:00:00,154 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:00,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:00,522 INFO L387 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 [2021-12-22 00:00:00,526 INFO L387 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 [2021-12-22 00:00:00,533 INFO L387 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 [2021-12-22 00:00:00,564 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:00,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657892559] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:00,564 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:00,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 34 [2021-12-22 00:00:00,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892027171] [2021-12-22 00:00:00,565 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:00,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-22 00:00:00,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:00,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-22 00:00:00,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1016, Unknown=0, NotChecked=0, Total=1122 [2021-12-22 00:00:00,567 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) [2021-12-22 00:00:00,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:00,947 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-12-22 00:00:00,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-22 00:00:00,948 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 [2021-12-22 00:00:00,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:00,948 INFO L225 Difference]: With dead ends: 44 [2021-12-22 00:00:00,948 INFO L226 Difference]: Without dead ends: 35 [2021-12-22 00:00:00,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=202, Invalid=1868, Unknown=0, NotChecked=0, Total=2070 [2021-12-22 00:00:00,949 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 37 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:00,949 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 120 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 79 Invalid, 0 Unknown, 108 Unchecked, 0.0s Time] [2021-12-22 00:00:00,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-12-22 00:00:00,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2021-12-22 00:00:00,950 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) [2021-12-22 00:00:00,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-12-22 00:00:00,951 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 21 [2021-12-22 00:00:00,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:00,951 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-12-22 00:00:00,951 INFO L471 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) [2021-12-22 00:00:00,951 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-12-22 00:00:00,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-22 00:00:00,951 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:00,951 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:00,969 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-22 00:00:01,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:01,160 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:01,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:01,160 INFO L85 PathProgramCache]: Analyzing trace with hash 2083749168, now seen corresponding path program 3 times [2021-12-22 00:00:01,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:01,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593634563] [2021-12-22 00:00:01,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:01,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:01,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:01,355 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:01,355 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:01,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593634563] [2021-12-22 00:00:01,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593634563] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:01,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450838713] [2021-12-22 00:00:01,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 00:00:01,355 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:01,355 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:01,356 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) [2021-12-22 00:00:01,358 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-22 00:00:01,400 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-22 00:00:01,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:01,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-22 00:00:01,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:01,516 INFO L387 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 [2021-12-22 00:00:01,678 INFO L387 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 [2021-12-22 00:00:01,683 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:01,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:01,782 INFO L387 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 [2021-12-22 00:00:01,784 INFO L387 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 [2021-12-22 00:00:01,932 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:01,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450838713] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:01,932 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:01,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2021-12-22 00:00:01,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203271519] [2021-12-22 00:00:01,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:01,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-22 00:00:01,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:01,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-22 00:00:01,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=672, Unknown=0, NotChecked=0, Total=756 [2021-12-22 00:00:01,934 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) [2021-12-22 00:00:02,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:02,128 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2021-12-22 00:00:02,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-22 00:00:02,129 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 [2021-12-22 00:00:02,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:02,129 INFO L225 Difference]: With dead ends: 50 [2021-12-22 00:00:02,129 INFO L226 Difference]: Without dead ends: 37 [2021-12-22 00:00:02,130 INFO L932 BasicCegarLoop]: 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 [2021-12-22 00:00:02,130 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 50 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:02,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 114 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 190 Invalid, 0 Unknown, 50 Unchecked, 0.1s Time] [2021-12-22 00:00:02,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-22 00:00:02,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2021-12-22 00:00:02,131 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) [2021-12-22 00:00:02,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-12-22 00:00:02,132 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2021-12-22 00:00:02,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:02,132 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-12-22 00:00:02,132 INFO L471 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) [2021-12-22 00:00:02,132 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-12-22 00:00:02,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-22 00:00:02,132 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:02,132 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:02,149 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:02,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:02,339 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:02,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:02,340 INFO L85 PathProgramCache]: Analyzing trace with hash 1764143245, now seen corresponding path program 4 times [2021-12-22 00:00:02,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:02,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998628527] [2021-12-22 00:00:02,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:02,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:02,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:02,522 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:02,523 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:02,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998628527] [2021-12-22 00:00:02,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998628527] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:02,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685570974] [2021-12-22 00:00:02,523 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 00:00:02,524 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:02,524 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:02,529 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) [2021-12-22 00:00:02,563 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-22 00:00:02,585 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 00:00:02,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:02,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-22 00:00:02,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:02,601 INFO L387 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 [2021-12-22 00:00:02,722 INFO L387 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 [2021-12-22 00:00:02,968 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 00:00:02,968 INFO L387 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 [2021-12-22 00:00:03,082 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:03,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:03,577 INFO L387 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 [2021-12-22 00:00:03,587 INFO L387 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 [2021-12-22 00:00:04,371 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 15 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:04,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685570974] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:04,371 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:04,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 44 [2021-12-22 00:00:04,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555169144] [2021-12-22 00:00:04,372 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:04,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-22 00:00:04,372 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:04,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-22 00:00:04,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1795, Unknown=0, NotChecked=0, Total=1980 [2021-12-22 00:00:04,373 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) [2021-12-22 00:00:05,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:05,355 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-12-22 00:00:05,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-22 00:00:05,356 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 [2021-12-22 00:00:05,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:05,356 INFO L225 Difference]: With dead ends: 44 [2021-12-22 00:00:05,356 INFO L226 Difference]: Without dead ends: 44 [2021-12-22 00:00:05,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=363, Invalid=3177, Unknown=0, NotChecked=0, Total=3540 [2021-12-22 00:00:05,357 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 69 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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 [2021-12-22 00:00:05,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 203 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 513 Invalid, 0 Unknown, 53 Unchecked, 0.3s Time] [2021-12-22 00:00:05,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-12-22 00:00:05,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2021-12-22 00:00:05,359 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) [2021-12-22 00:00:05,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-12-22 00:00:05,359 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 33 [2021-12-22 00:00:05,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:05,359 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-12-22 00:00:05,359 INFO L471 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) [2021-12-22 00:00:05,359 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-12-22 00:00:05,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-22 00:00:05,360 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:05,360 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:05,380 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:05,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-22 00:00:05,571 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:05,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:05,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1125055195, now seen corresponding path program 5 times [2021-12-22 00:00:05,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:05,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797524558] [2021-12-22 00:00:05,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:05,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:05,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:05,766 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:05,766 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:05,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797524558] [2021-12-22 00:00:05,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797524558] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:05,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110093852] [2021-12-22 00:00:05,766 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 00:00:05,767 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:05,767 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:05,768 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) [2021-12-22 00:00:05,783 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-22 00:00:05,845 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-22 00:00:05,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:05,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 42 conjunts are in the unsatisfiable core [2021-12-22 00:00:05,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:05,860 INFO L387 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 [2021-12-22 00:00:06,310 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:06,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:06,671 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:06,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110093852] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:06,671 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:06,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2021-12-22 00:00:06,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587375166] [2021-12-22 00:00:06,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:06,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-22 00:00:06,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:06,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-22 00:00:06,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1276, Unknown=0, NotChecked=0, Total=1482 [2021-12-22 00:00:06,675 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) [2021-12-22 00:00:07,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:07,167 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2021-12-22 00:00:07,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-22 00:00:07,168 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 [2021-12-22 00:00:07,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:07,169 INFO L225 Difference]: With dead ends: 69 [2021-12-22 00:00:07,169 INFO L226 Difference]: Without dead ends: 49 [2021-12-22 00:00:07,170 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=326, Invalid=1930, Unknown=0, NotChecked=0, Total=2256 [2021-12-22 00:00:07,172 INFO L933 BasicCegarLoop]: 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, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:07,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 147 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 00:00:07,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-12-22 00:00:07,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-12-22 00:00:07,177 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) [2021-12-22 00:00:07,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-12-22 00:00:07,178 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2021-12-22 00:00:07,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:07,178 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-12-22 00:00:07,178 INFO L471 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) [2021-12-22 00:00:07,178 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-12-22 00:00:07,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-22 00:00:07,182 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:07,182 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:07,209 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:07,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-12-22 00:00:07,392 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:07,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:07,393 INFO L85 PathProgramCache]: Analyzing trace with hash 459737784, now seen corresponding path program 6 times [2021-12-22 00:00:07,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:07,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296912565] [2021-12-22 00:00:07,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:07,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:07,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:07,956 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:07,957 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:07,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296912565] [2021-12-22 00:00:07,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296912565] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:07,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393416809] [2021-12-22 00:00:07,959 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 00:00:07,959 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:07,959 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:07,963 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) [2021-12-22 00:00:07,964 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-22 00:00:08,047 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-22 00:00:08,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:08,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-22 00:00:08,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:08,327 INFO L387 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 [2021-12-22 00:00:08,617 INFO L387 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 [2021-12-22 00:00:08,623 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:08,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:08,751 INFO L387 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 [2021-12-22 00:00:08,753 INFO L387 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 [2021-12-22 00:00:08,958 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:08,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393416809] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:08,958 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:08,958 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2021-12-22 00:00:08,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729800142] [2021-12-22 00:00:08,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:08,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-22 00:00:08,959 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:08,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-22 00:00:08,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2021-12-22 00:00:08,960 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) [2021-12-22 00:00:09,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:09,507 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2021-12-22 00:00:09,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-22 00:00:09,508 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 [2021-12-22 00:00:09,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:09,509 INFO L225 Difference]: With dead ends: 74 [2021-12-22 00:00:09,509 INFO L226 Difference]: Without dead ends: 53 [2021-12-22 00:00:09,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=177, Invalid=2079, Unknown=0, NotChecked=0, Total=2256 [2021-12-22 00:00:09,510 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 54 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:09,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 270 Invalid, 676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 635 Invalid, 0 Unknown, 33 Unchecked, 0.3s Time] [2021-12-22 00:00:09,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-12-22 00:00:09,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2021-12-22 00:00:09,511 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) [2021-12-22 00:00:09,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-12-22 00:00:09,511 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 45 [2021-12-22 00:00:09,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:09,511 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-12-22 00:00:09,511 INFO L471 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) [2021-12-22 00:00:09,512 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-12-22 00:00:09,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-22 00:00:09,512 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:09,512 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:09,545 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:09,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:09,723 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:09,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:09,724 INFO L85 PathProgramCache]: Analyzing trace with hash -414587883, now seen corresponding path program 7 times [2021-12-22 00:00:09,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:09,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086965976] [2021-12-22 00:00:09,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:09,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:09,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:10,107 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:10,107 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:10,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086965976] [2021-12-22 00:00:10,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086965976] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:10,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137033479] [2021-12-22 00:00:10,108 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-22 00:00:10,108 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:10,108 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:10,109 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) [2021-12-22 00:00:10,113 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-22 00:00:10,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:10,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 57 conjunts are in the unsatisfiable core [2021-12-22 00:00:10,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:10,482 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:10,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:10,909 INFO L387 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 [2021-12-22 00:00:10,972 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:10,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137033479] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:10,972 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:10,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21, 21] total 43 [2021-12-22 00:00:10,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729315364] [2021-12-22 00:00:10,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:10,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-22 00:00:10,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:10,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-22 00:00:10,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1729, Unknown=0, NotChecked=0, Total=1892 [2021-12-22 00:00:10,974 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) [2021-12-22 00:00:11,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:11,662 INFO L93 Difference]: Finished difference Result 56 states and 57 transitions. [2021-12-22 00:00:11,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-22 00:00:11,663 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 [2021-12-22 00:00:11,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:11,663 INFO L225 Difference]: With dead ends: 56 [2021-12-22 00:00:11,663 INFO L226 Difference]: Without dead ends: 56 [2021-12-22 00:00:11,664 INFO L932 BasicCegarLoop]: 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 [2021-12-22 00:00:11,674 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 101 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:11,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 306 Invalid, 833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 820 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 00:00:11,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-12-22 00:00:11,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2021-12-22 00:00:11,675 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) [2021-12-22 00:00:11,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-12-22 00:00:11,676 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 49 [2021-12-22 00:00:11,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:11,687 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-12-22 00:00:11,687 INFO L471 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) [2021-12-22 00:00:11,687 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-12-22 00:00:11,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-22 00:00:11,688 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:11,688 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:11,708 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:11,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-22 00:00:11,889 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:11,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:11,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1462244612, now seen corresponding path program 8 times [2021-12-22 00:00:11,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:11,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782637911] [2021-12-22 00:00:11,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:11,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:11,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:12,242 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 17 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:12,242 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:12,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782637911] [2021-12-22 00:00:12,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782637911] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:12,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068150130] [2021-12-22 00:00:12,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 00:00:12,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:12,242 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:12,243 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) [2021-12-22 00:00:12,244 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-22 00:00:12,321 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 00:00:12,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:12,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 72 conjunts are in the unsatisfiable core [2021-12-22 00:00:12,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:12,473 INFO L387 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 [2021-12-22 00:00:13,983 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 00:00:13,984 INFO L387 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 [2021-12-22 00:00:14,252 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:14,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:15,522 INFO L387 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 [2021-12-22 00:00:15,528 INFO L387 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 [2021-12-22 00:00:15,532 INFO L387 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 [2021-12-22 00:00:15,662 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:15,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068150130] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:15,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:15,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 66 [2021-12-22 00:00:15,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220531814] [2021-12-22 00:00:15,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:15,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-12-22 00:00:15,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:15,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-12-22 00:00:15,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=4043, Unknown=0, NotChecked=0, Total=4290 [2021-12-22 00:00:15,666 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) [2021-12-22 00:00:17,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:17,647 INFO L93 Difference]: Finished difference Result 92 states and 93 transitions. [2021-12-22 00:00:17,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-12-22 00:00:17,648 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 [2021-12-22 00:00:17,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:17,661 INFO L225 Difference]: With dead ends: 92 [2021-12-22 00:00:17,661 INFO L226 Difference]: Without dead ends: 67 [2021-12-22 00:00:17,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=444, Invalid=6866, Unknown=0, NotChecked=0, Total=7310 [2021-12-22 00:00:17,663 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 67 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 667 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 578 SdHoareTripleChecker+Invalid, 919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 240 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:17,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 578 Invalid, 919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 667 Invalid, 0 Unknown, 240 Unchecked, 0.3s Time] [2021-12-22 00:00:17,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-12-22 00:00:17,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2021-12-22 00:00:17,664 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) [2021-12-22 00:00:17,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-12-22 00:00:17,664 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 53 [2021-12-22 00:00:17,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:17,665 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-12-22 00:00:17,665 INFO L471 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) [2021-12-22 00:00:17,665 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-12-22 00:00:17,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-22 00:00:17,665 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:17,665 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:17,687 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:17,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-22 00:00:17,879 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:17,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:17,880 INFO L85 PathProgramCache]: Analyzing trace with hash 329833536, now seen corresponding path program 9 times [2021-12-22 00:00:17,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:17,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9711730] [2021-12-22 00:00:17,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:17,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:17,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:18,532 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:18,533 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:18,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9711730] [2021-12-22 00:00:18,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9711730] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:18,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1856509177] [2021-12-22 00:00:18,533 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 00:00:18,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:18,533 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:18,534 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) [2021-12-22 00:00:18,562 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-22 00:00:18,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-22 00:00:18,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:18,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 80 conjunts are in the unsatisfiable core [2021-12-22 00:00:18,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:19,098 INFO L387 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 [2021-12-22 00:00:19,414 INFO L387 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 [2021-12-22 00:00:19,428 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:19,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:19,678 INFO L387 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 [2021-12-22 00:00:19,679 INFO L387 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 [2021-12-22 00:00:19,875 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:19,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1856509177] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:19,876 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:19,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 44 [2021-12-22 00:00:19,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094430753] [2021-12-22 00:00:19,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:19,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-22 00:00:19,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:19,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-22 00:00:19,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1772, Unknown=0, NotChecked=0, Total=1892 [2021-12-22 00:00:19,880 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) [2021-12-22 00:00:20,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:20,574 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2021-12-22 00:00:20,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-22 00:00:20,575 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 [2021-12-22 00:00:20,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:20,576 INFO L225 Difference]: With dead ends: 98 [2021-12-22 00:00:20,576 INFO L226 Difference]: Without dead ends: 69 [2021-12-22 00:00:20,576 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 100 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=213, Invalid=3327, Unknown=0, NotChecked=0, Total=3540 [2021-12-22 00:00:20,577 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 51 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 1314 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 518 SdHoareTripleChecker+Invalid, 1367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:20,577 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 518 Invalid, 1367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1314 Invalid, 0 Unknown, 44 Unchecked, 0.4s Time] [2021-12-22 00:00:20,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-22 00:00:20,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2021-12-22 00:00:20,578 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) [2021-12-22 00:00:20,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-12-22 00:00:20,579 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2021-12-22 00:00:20,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:20,579 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-12-22 00:00:20,579 INFO L471 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) [2021-12-22 00:00:20,579 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-12-22 00:00:20,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-12-22 00:00:20,580 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:20,580 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:20,611 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:20,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:20,787 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:20,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:20,788 INFO L85 PathProgramCache]: Analyzing trace with hash 644832157, now seen corresponding path program 10 times [2021-12-22 00:00:20,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:20,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897081693] [2021-12-22 00:00:20,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:20,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:20,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:21,219 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:21,219 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:21,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897081693] [2021-12-22 00:00:21,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897081693] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:21,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033511363] [2021-12-22 00:00:21,220 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 00:00:21,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:21,220 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:21,221 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) [2021-12-22 00:00:21,222 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-22 00:00:21,298 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 00:00:21,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:21,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 88 conjunts are in the unsatisfiable core [2021-12-22 00:00:21,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:21,335 INFO L387 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 [2021-12-22 00:00:21,958 INFO L387 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 [2021-12-22 00:00:22,783 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 00:00:22,784 INFO L387 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 [2021-12-22 00:00:22,970 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 72 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:22,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:24,889 INFO L387 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 [2021-12-22 00:00:24,893 INFO L387 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 [2021-12-22 00:00:25,969 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 91 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:25,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033511363] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:25,970 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:25,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 29, 29] total 81 [2021-12-22 00:00:25,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073196593] [2021-12-22 00:00:25,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:25,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-12-22 00:00:25,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:25,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-12-22 00:00:25,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=472, Invalid=6170, Unknown=0, NotChecked=0, Total=6642 [2021-12-22 00:00:25,972 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) [2021-12-22 00:00:28,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:28,004 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2021-12-22 00:00:28,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-22 00:00:28,005 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 [2021-12-22 00:00:28,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:28,005 INFO L225 Difference]: With dead ends: 76 [2021-12-22 00:00:28,005 INFO L226 Difference]: Without dead ends: 76 [2021-12-22 00:00:28,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=856, Invalid=10274, Unknown=0, NotChecked=0, Total=11130 [2021-12-22 00:00:28,008 INFO L933 BasicCegarLoop]: 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 [2021-12-22 00:00:28,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 590 Invalid, 1833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1702 Invalid, 0 Unknown, 96 Unchecked, 0.7s Time] [2021-12-22 00:00:28,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-22 00:00:28,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2021-12-22 00:00:28,009 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) [2021-12-22 00:00:28,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-12-22 00:00:28,009 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 65 [2021-12-22 00:00:28,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:28,009 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-12-22 00:00:28,010 INFO L471 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) [2021-12-22 00:00:28,010 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-12-22 00:00:28,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-12-22 00:00:28,010 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:28,010 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:28,031 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:28,210 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:28,211 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:28,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:28,211 INFO L85 PathProgramCache]: Analyzing trace with hash 851678699, now seen corresponding path program 11 times [2021-12-22 00:00:28,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:28,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949990801] [2021-12-22 00:00:28,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:28,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:28,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:28,713 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 132 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:28,714 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:28,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949990801] [2021-12-22 00:00:28,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949990801] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:28,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366944083] [2021-12-22 00:00:28,714 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 00:00:28,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:28,714 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:28,717 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) [2021-12-22 00:00:28,718 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-22 00:00:28,901 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-12-22 00:00:28,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:28,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 70 conjunts are in the unsatisfiable core [2021-12-22 00:00:28,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:28,920 INFO L387 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 [2021-12-22 00:00:30,242 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:30,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:30,875 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:30,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366944083] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:30,876 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:30,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 67 [2021-12-22 00:00:30,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177287726] [2021-12-22 00:00:30,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:30,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-12-22 00:00:30,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:30,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-12-22 00:00:30,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=3862, Unknown=0, NotChecked=0, Total=4422 [2021-12-22 00:00:30,878 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) [2021-12-22 00:00:31,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:31,530 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2021-12-22 00:00:31,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-22 00:00:31,531 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 [2021-12-22 00:00:31,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:31,531 INFO L225 Difference]: With dead ends: 117 [2021-12-22 00:00:31,531 INFO L226 Difference]: Without dead ends: 81 [2021-12-22 00:00:31,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2047 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=930, Invalid=6042, Unknown=0, NotChecked=0, Total=6972 [2021-12-22 00:00:31,532 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 93 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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 [2021-12-22 00:00:31,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 249 Invalid, 718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 00:00:31,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-12-22 00:00:31,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2021-12-22 00:00:31,534 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) [2021-12-22 00:00:31,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2021-12-22 00:00:31,534 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 73 [2021-12-22 00:00:31,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:31,534 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2021-12-22 00:00:31,534 INFO L471 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) [2021-12-22 00:00:31,535 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2021-12-22 00:00:31,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-12-22 00:00:31,535 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:31,535 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:31,554 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:31,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-12-22 00:00:31,743 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:31,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:31,744 INFO L85 PathProgramCache]: Analyzing trace with hash -228789816, now seen corresponding path program 12 times [2021-12-22 00:00:31,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:31,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987210869] [2021-12-22 00:00:31,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:31,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:31,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:32,357 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:32,357 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:32,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987210869] [2021-12-22 00:00:32,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987210869] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:32,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187583206] [2021-12-22 00:00:32,358 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 00:00:32,358 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:32,358 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:32,359 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) [2021-12-22 00:00:32,360 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-22 00:00:32,471 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-12-22 00:00:32,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:32,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 100 conjunts are in the unsatisfiable core [2021-12-22 00:00:32,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:32,834 INFO L387 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 [2021-12-22 00:00:33,056 INFO L387 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 [2021-12-22 00:00:33,062 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:33,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:33,218 INFO L387 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 [2021-12-22 00:00:33,220 INFO L387 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 [2021-12-22 00:00:33,481 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:33,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187583206] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:33,481 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:33,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 52 [2021-12-22 00:00:33,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761622772] [2021-12-22 00:00:33,482 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:33,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-12-22 00:00:33,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:33,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-12-22 00:00:33,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2514, Unknown=0, NotChecked=0, Total=2652 [2021-12-22 00:00:33,483 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) [2021-12-22 00:00:34,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:34,649 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2021-12-22 00:00:34,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-22 00:00:34,650 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 [2021-12-22 00:00:34,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:34,650 INFO L225 Difference]: With dead ends: 122 [2021-12-22 00:00:34,650 INFO L226 Difference]: Without dead ends: 85 [2021-12-22 00:00:34,651 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 129 SyntacticMatches, 6 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=249, Invalid=4863, Unknown=0, NotChecked=0, Total=5112 [2021-12-22 00:00:34,651 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 68 mSDsluCounter, 727 mSDsCounter, 0 mSdLazyCounter, 1938 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 757 SdHoareTripleChecker+Invalid, 2054 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:34,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 757 Invalid, 2054 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1938 Invalid, 0 Unknown, 105 Unchecked, 0.6s Time] [2021-12-22 00:00:34,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-12-22 00:00:34,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2021-12-22 00:00:34,652 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) [2021-12-22 00:00:34,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-12-22 00:00:34,653 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2021-12-22 00:00:34,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:34,653 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-12-22 00:00:34,653 INFO L471 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) [2021-12-22 00:00:34,653 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-12-22 00:00:34,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-12-22 00:00:34,654 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:34,654 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:34,672 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:34,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-22 00:00:34,863 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:34,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:34,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1274746661, now seen corresponding path program 13 times [2021-12-22 00:00:34,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:34,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684376259] [2021-12-22 00:00:34,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:34,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:34,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:35,456 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 91 proven. 224 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:35,456 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:35,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684376259] [2021-12-22 00:00:35,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684376259] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:35,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [646610909] [2021-12-22 00:00:35,457 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-22 00:00:35,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:35,457 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:35,458 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) [2021-12-22 00:00:35,459 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-22 00:00:35,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:35,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 93 conjunts are in the unsatisfiable core [2021-12-22 00:00:35,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:36,042 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:36,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:36,818 INFO L387 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 [2021-12-22 00:00:36,904 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:36,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [646610909] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:36,904 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:36,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 33, 33] total 67 [2021-12-22 00:00:36,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741947052] [2021-12-22 00:00:36,904 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:36,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-12-22 00:00:36,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:36,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-12-22 00:00:36,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=4225, Unknown=0, NotChecked=0, Total=4556 [2021-12-22 00:00:36,905 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) [2021-12-22 00:00:38,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:38,035 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2021-12-22 00:00:38,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-22 00:00:38,036 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 [2021-12-22 00:00:38,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:38,036 INFO L225 Difference]: With dead ends: 88 [2021-12-22 00:00:38,036 INFO L226 Difference]: Without dead ends: 88 [2021-12-22 00:00:38,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 123 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1383 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=640, Invalid=6842, Unknown=0, NotChecked=0, Total=7482 [2021-12-22 00:00:38,037 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 180 mSDsluCounter, 678 mSDsCounter, 0 mSdLazyCounter, 2015 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 713 SdHoareTripleChecker+Invalid, 2032 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2015 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:38,037 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 713 Invalid, 2032 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2015 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-22 00:00:38,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-12-22 00:00:38,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2021-12-22 00:00:38,038 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) [2021-12-22 00:00:38,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-12-22 00:00:38,039 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 81 [2021-12-22 00:00:38,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:38,039 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-12-22 00:00:38,039 INFO L471 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) [2021-12-22 00:00:38,039 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-12-22 00:00:38,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-12-22 00:00:38,040 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:38,040 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:38,079 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-12-22 00:00:38,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:38,247 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:38,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:38,248 INFO L85 PathProgramCache]: Analyzing trace with hash 479794700, now seen corresponding path program 14 times [2021-12-22 00:00:38,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:38,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583487621] [2021-12-22 00:00:38,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:38,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:38,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:38,828 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 29 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:38,828 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:38,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583487621] [2021-12-22 00:00:38,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583487621] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:38,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351977252] [2021-12-22 00:00:38,828 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 00:00:38,828 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:38,828 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:38,836 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) [2021-12-22 00:00:38,837 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-22 00:00:38,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 00:00:38,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:38,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 108 conjunts are in the unsatisfiable core [2021-12-22 00:00:38,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:39,248 INFO L387 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 [2021-12-22 00:00:41,428 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 00:00:41,429 INFO L387 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 [2021-12-22 00:00:41,691 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:41,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:43,929 INFO L387 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 [2021-12-22 00:00:43,932 INFO L387 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 [2021-12-22 00:00:43,935 INFO L387 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 [2021-12-22 00:00:44,049 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:44,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351977252] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:44,050 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:44,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37] total 98 [2021-12-22 00:00:44,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104279661] [2021-12-22 00:00:44,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:44,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-12-22 00:00:44,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:44,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-12-22 00:00:44,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=9051, Unknown=0, NotChecked=0, Total=9506 [2021-12-22 00:00:44,052 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) [2021-12-22 00:00:48,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:48,748 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2021-12-22 00:00:48,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-12-22 00:00:48,749 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 [2021-12-22 00:00:48,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:48,749 INFO L225 Difference]: With dead ends: 140 [2021-12-22 00:00:48,749 INFO L226 Difference]: Without dead ends: 99 [2021-12-22 00:00:48,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2154 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=792, Invalid=14958, Unknown=0, NotChecked=0, Total=15750 [2021-12-22 00:00:48,750 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 99 mSDsluCounter, 1210 mSDsCounter, 0 mSdLazyCounter, 1620 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 1246 SdHoareTripleChecker+Invalid, 2151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 514 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:48,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 1246 Invalid, 2151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1620 Invalid, 0 Unknown, 514 Unchecked, 0.7s Time] [2021-12-22 00:00:48,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-12-22 00:00:48,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 94. [2021-12-22 00:00:48,753 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) [2021-12-22 00:00:48,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-12-22 00:00:48,753 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 85 [2021-12-22 00:00:48,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:48,753 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-12-22 00:00:48,754 INFO L471 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) [2021-12-22 00:00:48,754 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-12-22 00:00:48,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-12-22 00:00:48,754 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:48,754 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:48,777 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:48,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:48,965 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:48,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:48,965 INFO L85 PathProgramCache]: Analyzing trace with hash -790148272, now seen corresponding path program 15 times [2021-12-22 00:00:48,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:48,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996569678] [2021-12-22 00:00:48,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:48,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:48,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:49,517 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:49,518 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:49,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996569678] [2021-12-22 00:00:49,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996569678] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:49,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566274622] [2021-12-22 00:00:49,518 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 00:00:49,518 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:49,518 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:49,519 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) [2021-12-22 00:00:49,521 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-22 00:00:49,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-12-22 00:00:49,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:49,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 120 conjunts are in the unsatisfiable core [2021-12-22 00:00:49,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:49,996 INFO L387 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 [2021-12-22 00:00:50,218 INFO L387 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 [2021-12-22 00:00:50,222 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:50,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:50,439 INFO L387 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 [2021-12-22 00:00:50,440 INFO L387 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 [2021-12-22 00:00:50,734 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:50,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1566274622] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:50,735 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:50,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 60 [2021-12-22 00:00:50,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27471830] [2021-12-22 00:00:50,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:50,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-12-22 00:00:50,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:50,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-12-22 00:00:50,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=3384, Unknown=0, NotChecked=0, Total=3540 [2021-12-22 00:00:50,736 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) [2021-12-22 00:00:51,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:00:51,991 INFO L93 Difference]: Finished difference Result 146 states and 147 transitions. [2021-12-22 00:00:51,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-12-22 00:00:51,991 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 [2021-12-22 00:00:51,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:00:51,992 INFO L225 Difference]: With dead ends: 146 [2021-12-22 00:00:51,992 INFO L226 Difference]: Without dead ends: 101 [2021-12-22 00:00:51,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 160 SyntacticMatches, 5 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=285, Invalid=6687, Unknown=0, NotChecked=0, Total=6972 [2021-12-22 00:00:51,993 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 73 mSDsluCounter, 1017 mSDsCounter, 0 mSdLazyCounter, 2818 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 1053 SdHoareTripleChecker+Invalid, 2893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 2818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-22 00:00:51,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 1053 Invalid, 2893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 2818 Invalid, 0 Unknown, 62 Unchecked, 0.7s Time] [2021-12-22 00:00:51,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-12-22 00:00:51,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 98. [2021-12-22 00:00:51,995 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) [2021-12-22 00:00:51,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-12-22 00:00:51,995 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 93 [2021-12-22 00:00:51,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:00:51,996 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-12-22 00:00:51,996 INFO L471 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) [2021-12-22 00:00:51,996 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-12-22 00:00:51,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-12-22 00:00:51,997 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:00:51,997 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:00:52,023 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-22 00:00:52,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-12-22 00:00:52,215 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:00:52,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:00:52,215 INFO L85 PathProgramCache]: Analyzing trace with hash 156309165, now seen corresponding path program 16 times [2021-12-22 00:00:52,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:00:52,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302486021] [2021-12-22 00:00:52,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:00:52,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:00:52,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:00:52,909 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 153 proven. 320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:52,909 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:00:52,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302486021] [2021-12-22 00:00:52,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302486021] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:00:52,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82204668] [2021-12-22 00:00:52,909 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 00:00:52,909 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:00:52,909 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:00:52,910 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) [2021-12-22 00:00:52,911 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-22 00:00:52,999 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 00:00:52,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:00:53,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 124 conjunts are in the unsatisfiable core [2021-12-22 00:00:53,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:00:53,013 INFO L387 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 [2021-12-22 00:00:53,629 INFO L387 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 [2021-12-22 00:00:55,206 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 00:00:55,206 INFO L387 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 [2021-12-22 00:00:55,482 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 200 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:55,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:00:57,504 INFO L387 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 [2021-12-22 00:00:57,506 INFO L387 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 [2021-12-22 00:00:59,601 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 231 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:00:59,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82204668] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:00:59,602 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:00:59,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 41, 41] total 117 [2021-12-22 00:00:59,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190849967] [2021-12-22 00:00:59,602 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:00:59,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2021-12-22 00:00:59,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:00:59,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2021-12-22 00:00:59,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=906, Invalid=12900, Unknown=0, NotChecked=0, Total=13806 [2021-12-22 00:00:59,604 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) [2021-12-22 00:01:03,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:01:03,350 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2021-12-22 00:01:03,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-12-22 00:01:03,351 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 [2021-12-22 00:01:03,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:01:03,351 INFO L225 Difference]: With dead ends: 108 [2021-12-22 00:01:03,351 INFO L226 Difference]: Without dead ends: 108 [2021-12-22 00:01:03,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3666 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=1528, Invalid=20822, Unknown=0, NotChecked=0, Total=22350 [2021-12-22 00:01:03,352 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 254 mSDsluCounter, 1137 mSDsCounter, 0 mSdLazyCounter, 3408 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s 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, 1.4s IncrementalHoareTripleChecker+Time [2021-12-22 00:01:03,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 1177 Invalid, 3569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 3408 Invalid, 0 Unknown, 120 Unchecked, 1.4s Time] [2021-12-22 00:01:03,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-12-22 00:01:03,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2021-12-22 00:01:03,354 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) [2021-12-22 00:01:03,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2021-12-22 00:01:03,354 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 97 [2021-12-22 00:01:03,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:01:03,354 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2021-12-22 00:01:03,355 INFO L471 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) [2021-12-22 00:01:03,355 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2021-12-22 00:01:03,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-12-22 00:01:03,355 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:01:03,355 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:01:03,377 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-12-22 00:01:03,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-22 00:01:03,571 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:01:03,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:01:03,572 INFO L85 PathProgramCache]: Analyzing trace with hash -436125445, now seen corresponding path program 17 times [2021-12-22 00:01:03,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:01:03,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144181555] [2021-12-22 00:01:03,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:01:03,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:01:03,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:01:04,625 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 292 proven. 277 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:01:04,626 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:01:04,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144181555] [2021-12-22 00:01:04,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144181555] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:01:04,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778458420] [2021-12-22 00:01:04,626 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 00:01:04,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:01:04,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:01:04,627 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) [2021-12-22 00:01:04,628 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-22 00:01:04,733 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-12-22 00:01:04,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:01:04,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 98 conjunts are in the unsatisfiable core [2021-12-22 00:01:04,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:01:04,755 INFO L387 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 [2021-12-22 00:01:06,531 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:01:06,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:01:07,535 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:01:07,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [778458420] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:01:07,535 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:01:07,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 96 [2021-12-22 00:01:07,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467955358] [2021-12-22 00:01:07,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:01:07,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-12-22 00:01:07,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:01:07,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-12-22 00:01:07,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1173, Invalid=7947, Unknown=0, NotChecked=0, Total=9120 [2021-12-22 00:01:07,537 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) [2021-12-22 00:01:08,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:01:08,206 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2021-12-22 00:01:08,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-12-22 00:01:08,206 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 [2021-12-22 00:01:08,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:01:08,211 INFO L225 Difference]: With dead ends: 165 [2021-12-22 00:01:08,211 INFO L226 Difference]: Without dead ends: 113 [2021-12-22 00:01:08,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3696 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1651, Invalid=10339, Unknown=0, NotChecked=0, Total=11990 [2021-12-22 00:01:08,212 INFO L933 BasicCegarLoop]: 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, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 00:01:08,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 323 Invalid, 944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 931 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 00:01:08,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-12-22 00:01:08,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 110. [2021-12-22 00:01:08,224 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) [2021-12-22 00:01:08,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2021-12-22 00:01:08,224 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 105 [2021-12-22 00:01:08,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:01:08,225 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2021-12-22 00:01:08,225 INFO L471 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) [2021-12-22 00:01:08,225 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2021-12-22 00:01:08,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-12-22 00:01:08,236 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:01:08,236 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:01:08,256 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-22 00:01:08,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-12-22 00:01:08,454 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:01:08,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:01:08,455 INFO L85 PathProgramCache]: Analyzing trace with hash 1420552408, now seen corresponding path program 18 times [2021-12-22 00:01:08,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:01:08,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757216482] [2021-12-22 00:01:08,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:01:08,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:01:08,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:01:09,293 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:01:09,293 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:01:09,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757216482] [2021-12-22 00:01:09,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757216482] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:01:09,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373380295] [2021-12-22 00:01:09,294 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 00:01:09,294 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:01:09,295 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:01:09,297 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) [2021-12-22 00:01:09,299 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-22 00:01:09,538 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-12-22 00:01:09,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 00:01:09,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 140 conjunts are in the unsatisfiable core [2021-12-22 00:01:09,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:01:10,160 INFO L387 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 [2021-12-22 00:01:10,448 INFO L387 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 [2021-12-22 00:01:10,455 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:01:10,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:01:10,644 INFO L387 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 [2021-12-22 00:01:10,649 INFO L387 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 [2021-12-22 00:01:10,998 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:01:10,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373380295] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:01:10,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:01:10,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 68 [2021-12-22 00:01:10,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595252207] [2021-12-22 00:01:10,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:01:10,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-12-22 00:01:10,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:01:10,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-12-22 00:01:10,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=4382, Unknown=0, NotChecked=0, Total=4556 [2021-12-22 00:01:11,000 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) [2021-12-22 00:01:12,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:01:12,928 INFO L93 Difference]: Finished difference Result 170 states and 171 transitions. [2021-12-22 00:01:12,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-12-22 00:01:12,928 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 [2021-12-22 00:01:12,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:01:12,929 INFO L225 Difference]: With dead ends: 170 [2021-12-22 00:01:12,929 INFO L226 Difference]: Without dead ends: 117 [2021-12-22 00:01:12,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 185 SyntacticMatches, 10 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=321, Invalid=8799, Unknown=0, NotChecked=0, Total=9120 [2021-12-22 00:01:12,929 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 87 mSDsluCounter, 1445 mSDsCounter, 0 mSdLazyCounter, 4056 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 1487 SdHoareTripleChecker+Invalid, 4145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 4056 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:01:12,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 1487 Invalid, 4145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 4056 Invalid, 0 Unknown, 73 Unchecked, 1.1s Time] [2021-12-22 00:01:12,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-12-22 00:01:12,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 114. [2021-12-22 00:01:12,931 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) [2021-12-22 00:01:12,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2021-12-22 00:01:12,931 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 109 [2021-12-22 00:01:12,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:01:12,931 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2021-12-22 00:01:12,932 INFO L471 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) [2021-12-22 00:01:12,932 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2021-12-22 00:01:12,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-12-22 00:01:12,932 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:01:12,932 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:01:12,957 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-12-22 00:01:13,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:01:13,151 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-22 00:01:13,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:01:13,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1680516555, now seen corresponding path program 19 times [2021-12-22 00:01:13,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:01:13,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321736976] [2021-12-22 00:01:13,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:01:13,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:01:13,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:01:14,378 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 231 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:01:14,378 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:01:14,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321736976] [2021-12-22 00:01:14,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321736976] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:01:14,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12325142] [2021-12-22 00:01:14,379 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-22 00:01:14,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:01:14,379 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:01:14,380 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) [2021-12-22 00:01:14,395 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-22 00:01:14,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:01:14,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 129 conjunts are in the unsatisfiable core [2021-12-22 00:01:14,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:01:15,531 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 276 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:01:15,532 INFO L328 TraceCheckSpWp]: Computing backward predicates...