./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 ff03de63 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-ff03de6 [2021-12-21 18:01:20,809 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 18:01:20,811 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 18:01:20,846 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 18:01:20,847 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 18:01:20,849 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 18:01:20,850 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 18:01:20,852 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 18:01:20,853 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 18:01:20,856 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 18:01:20,857 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 18:01:20,858 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 18:01:20,858 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 18:01:20,860 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 18:01:20,861 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 18:01:20,863 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 18:01:20,864 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 18:01:20,864 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 18:01:20,866 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 18:01:20,870 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 18:01:20,871 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 18:01:20,871 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 18:01:20,873 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 18:01:20,873 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 18:01:20,878 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 18:01:20,878 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 18:01:20,878 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 18:01:20,879 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 18:01:20,880 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 18:01:20,880 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 18:01:20,880 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 18:01:20,881 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 18:01:20,882 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 18:01:20,883 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 18:01:20,884 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 18:01:20,884 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 18:01:20,884 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 18:01:20,884 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 18:01:20,885 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 18:01:20,886 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 18:01:20,886 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 18:01:20,887 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-21 18:01:20,911 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 18:01:20,911 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 18:01:20,911 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 18:01:20,912 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 18:01:20,912 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 18:01:20,912 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 18:01:20,913 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 18:01:20,913 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 18:01:20,913 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 18:01:20,913 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 18:01:20,914 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 18:01:20,914 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-21 18:01:20,914 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 18:01:20,914 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 18:01:20,914 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 18:01:20,915 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-21 18:01:20,915 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-21 18:01:20,915 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-21 18:01:20,915 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 18:01:20,915 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-21 18:01:20,915 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 18:01:20,915 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 18:01:20,916 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 18:01:20,916 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 18:01:20,916 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 18:01:20,916 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 18:01:20,916 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 18:01:20,916 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 18:01:20,916 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 18:01:20,916 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 18:01:20,917 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 18:01:20,917 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 60396cce4fa0936fb91e88a54a287214045469c9d9b3d447954681e0a5aabbc0 [2021-12-21 18:01:21,120 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 18:01:21,139 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 18:01:21,141 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 18:01:21,142 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 18:01:21,142 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 18:01:21,143 INFO L432 ainManager$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 18:01:21,200 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d6beb3161/23e1631bb7744d23841727401ae5a7ae/FLAG7388e120b [2021-12-21 18:01:21,562 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 18:01:21,563 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2021-12-21 18:01:21,576 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d6beb3161/23e1631bb7744d23841727401ae5a7ae/FLAG7388e120b [2021-12-21 18:01:21,944 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d6beb3161/23e1631bb7744d23841727401ae5a7ae [2021-12-21 18:01:21,946 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 18:01:21,947 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 18:01:21,952 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 18:01:21,952 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 18:01:21,954 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 18:01:21,955 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 06:01:21" (1/1) ... [2021-12-21 18:01:21,955 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bfed7b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:21, skipping insertion in model container [2021-12-21 18:01:21,957 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 06:01:21" (1/1) ... [2021-12-21 18:01:21,961 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 18:01:22,000 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 18:01:22,195 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 18:01:22,200 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 18:01:22,237 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 18:01:22,256 INFO L208 MainTranslator]: Completed translation [2021-12-21 18:01:22,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22 WrapperNode [2021-12-21 18:01:22,257 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 18:01:22,258 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 18:01:22,258 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 18:01:22,259 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 18:01:22,264 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,284 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,301 INFO L137 Inliner]: procedures = 117, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 29 [2021-12-21 18:01:22,301 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 18:01:22,303 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 18:01:22,303 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 18:01:22,303 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 18:01:22,309 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,309 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,313 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,314 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,317 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,320 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,321 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 18:01:22,331 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 18:01:22,331 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 18:01:22,331 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 18:01:22,332 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (1/1) ... [2021-12-21 18:01:22,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 18:01:22,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:22,359 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 18:01:22,454 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 18:01:22,478 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-21 18:01:22,479 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-21 18:01:22,479 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-21 18:01:22,480 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-21 18:01:22,480 INFO L130 BoogieDeclarations]: Found specification of procedure strlen_rec [2021-12-21 18:01:22,480 INFO L138 BoogieDeclarations]: Found implementation of procedure strlen_rec [2021-12-21 18:01:22,480 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 18:01:22,480 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 18:01:22,609 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 18:01:22,610 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 18:01:22,811 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 18:01:22,831 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 18:01:22,831 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-21 18:01:22,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 06:01:22 BoogieIcfgContainer [2021-12-21 18:01:22,833 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 18:01:22,834 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 18:01:22,834 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 18:01:22,836 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 18:01:22,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 06:01:21" (1/3) ... [2021-12-21 18:01:22,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68d3d458 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 06:01:22, skipping insertion in model container [2021-12-21 18:01:22,837 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:01:22" (2/3) ... [2021-12-21 18:01:22,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68d3d458 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 06:01:22, skipping insertion in model container [2021-12-21 18:01:22,837 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 06:01:22" (3/3) ... [2021-12-21 18:01:22,838 INFO L111 eAbstractionObserver]: Analyzing ICFG rec_strlen-alloca-1.i [2021-12-21 18:01:22,842 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 18:01:22,842 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 7 error locations. [2021-12-21 18:01:22,900 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 18:01:22,904 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 18:01:22,908 INFO L340 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2021-12-21 18:01:22,925 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 18:01:22,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-21 18:01:22,938 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:22,938 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-21 18:01:22,939 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 18:01:22,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:22,945 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2021-12-21 18:01:22,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:22,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262415582] [2021-12-21 18:01:22,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:22,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:23,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:23,116 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 18:01:23,117 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:23,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262415582] [2021-12-21 18:01:23,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262415582] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:01:23,118 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:01:23,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 18:01:23,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192394404] [2021-12-21 18:01:23,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:01:23,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 18:01:23,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:23,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 18:01:23,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-21 18:01:23,146 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 18:01:23,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:23,192 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-12-21 18:01:23,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 18:01:23,195 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 18:01:23,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:23,203 INFO L225 Difference]: With dead ends: 39 [2021-12-21 18:01:23,203 INFO L226 Difference]: Without dead ends: 35 [2021-12-21 18:01:23,206 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 18:01:23,208 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 18:01:23,209 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 18:01:23,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-12-21 18:01:23,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-12-21 18:01:23,242 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 18:01:23,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-12-21 18:01:23,245 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 6 [2021-12-21 18:01:23,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:23,245 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-12-21 18:01:23,246 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 18:01:23,246 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-12-21 18:01:23,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-21 18:01:23,246 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:23,246 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-21 18:01:23,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 18:01:23,247 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 18:01:23,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:23,249 INFO L85 PathProgramCache]: Analyzing trace with hash 889508820, now seen corresponding path program 1 times [2021-12-21 18:01:23,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:23,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187649505] [2021-12-21 18:01:23,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:23,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:23,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:23,302 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 18:01:23,303 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:23,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187649505] [2021-12-21 18:01:23,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187649505] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:01:23,304 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:01:23,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 18:01:23,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962938090] [2021-12-21 18:01:23,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:01:23,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 18:01:23,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:23,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 18:01:23,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:01:23,307 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 18:01:23,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:23,324 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2021-12-21 18:01:23,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 18:01:23,325 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 18:01:23,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:23,327 INFO L225 Difference]: With dead ends: 26 [2021-12-21 18:01:23,327 INFO L226 Difference]: Without dead ends: 26 [2021-12-21 18:01:23,327 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 18:01:23,331 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 18:01:23,331 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 18:01:23,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-12-21 18:01:23,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-12-21 18:01:23,336 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 18:01:23,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-12-21 18:01:23,338 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 6 [2021-12-21 18:01:23,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:23,339 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-12-21 18:01:23,339 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 18:01:23,339 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-12-21 18:01:23,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-21 18:01:23,340 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:23,340 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-21 18:01:23,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 18:01:23,343 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 18:01:23,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:23,343 INFO L85 PathProgramCache]: Analyzing trace with hash 889508821, now seen corresponding path program 1 times [2021-12-21 18:01:23,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:23,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254442723] [2021-12-21 18:01:23,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:23,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:23,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:23,405 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 18:01:23,409 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:23,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254442723] [2021-12-21 18:01:23,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254442723] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:01:23,410 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:01:23,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 18:01:23,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573518541] [2021-12-21 18:01:23,410 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:01:23,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 18:01:23,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:23,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 18:01:23,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-21 18:01:23,412 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 18:01:23,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:23,437 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-12-21 18:01:23,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 18:01:23,437 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 18:01:23,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:23,438 INFO L225 Difference]: With dead ends: 25 [2021-12-21 18:01:23,438 INFO L226 Difference]: Without dead ends: 25 [2021-12-21 18:01:23,439 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 18:01:23,443 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 18:01:23,444 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 18:01:23,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-12-21 18:01:23,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-12-21 18:01:23,449 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 18:01:23,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-12-21 18:01:23,450 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 6 [2021-12-21 18:01:23,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:23,451 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-12-21 18:01:23,451 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 18:01:23,451 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-12-21 18:01:23,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-21 18:01:23,451 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:23,451 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-21 18:01:23,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-21 18:01:23,452 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 18:01:23,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:23,453 INFO L85 PathProgramCache]: Analyzing trace with hash 889568456, now seen corresponding path program 1 times [2021-12-21 18:01:23,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:23,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546881769] [2021-12-21 18:01:23,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:23,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:23,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:23,508 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 18:01:23,509 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:23,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546881769] [2021-12-21 18:01:23,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546881769] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:01:23,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:01:23,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 18:01:23,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554299315] [2021-12-21 18:01:23,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:01:23,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 18:01:23,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:23,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 18:01:23,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 18:01:23,511 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 18:01:23,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:23,548 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-12-21 18:01:23,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 18:01:23,549 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 18:01:23,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:23,550 INFO L225 Difference]: With dead ends: 34 [2021-12-21 18:01:23,550 INFO L226 Difference]: Without dead ends: 34 [2021-12-21 18:01:23,550 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 18:01:23,555 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 18:01:23,556 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 18:01:23,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-12-21 18:01:23,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2021-12-21 18:01:23,561 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 18:01:23,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-12-21 18:01:23,561 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 6 [2021-12-21 18:01:23,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:23,562 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-12-21 18:01:23,562 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 18:01:23,562 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-12-21 18:01:23,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-21 18:01:23,562 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:23,563 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:23,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-21 18:01:23,563 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 18:01:23,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:23,564 INFO L85 PathProgramCache]: Analyzing trace with hash -590943170, now seen corresponding path program 1 times [2021-12-21 18:01:23,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:23,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531025096] [2021-12-21 18:01:23,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:23,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:23,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:23,616 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 18:01:23,616 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:23,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531025096] [2021-12-21 18:01:23,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531025096] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:01:23,617 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:01:23,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 18:01:23,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396815087] [2021-12-21 18:01:23,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:01:23,617 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 18:01:23,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:23,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 18:01:23,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 18:01:23,618 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 18:01:23,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:23,662 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-12-21 18:01:23,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 18:01:23,663 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 18:01:23,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:23,664 INFO L225 Difference]: With dead ends: 26 [2021-12-21 18:01:23,664 INFO L226 Difference]: Without dead ends: 26 [2021-12-21 18:01:23,664 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 18:01:23,665 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 18:01:23,665 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 18:01:23,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-12-21 18:01:23,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-12-21 18:01:23,667 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 18:01:23,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-12-21 18:01:23,668 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 9 [2021-12-21 18:01:23,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:23,668 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-12-21 18:01:23,669 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 18:01:23,669 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-12-21 18:01:23,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-21 18:01:23,669 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:23,669 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:23,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-21 18:01:23,670 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 18:01:23,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:23,670 INFO L85 PathProgramCache]: Analyzing trace with hash -590943169, now seen corresponding path program 1 times [2021-12-21 18:01:23,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:23,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469378366] [2021-12-21 18:01:23,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:23,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:23,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:23,725 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 18:01:23,726 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:23,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469378366] [2021-12-21 18:01:23,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469378366] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:01:23,726 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:01:23,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 18:01:23,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86047227] [2021-12-21 18:01:23,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:01:23,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 18:01:23,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:23,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 18:01:23,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:01:23,728 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 18:01:23,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:23,795 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2021-12-21 18:01:23,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 18:01:23,796 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 18:01:23,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:23,799 INFO L225 Difference]: With dead ends: 33 [2021-12-21 18:01:23,799 INFO L226 Difference]: Without dead ends: 33 [2021-12-21 18:01:23,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-21 18:01:23,800 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 18:01:23,800 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 18:01:23,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-12-21 18:01:23,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-12-21 18:01:23,802 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 18:01:23,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2021-12-21 18:01:23,803 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 9 [2021-12-21 18:01:23,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:23,803 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2021-12-21 18:01:23,803 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 18:01:23,803 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2021-12-21 18:01:23,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-21 18:01:23,803 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:23,803 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:23,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-21 18:01:23,804 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 18:01:23,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:23,804 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2021-12-21 18:01:23,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:23,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851645622] [2021-12-21 18:01:23,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:23,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:23,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:23,878 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 18:01:23,879 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:23,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851645622] [2021-12-21 18:01:23,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851645622] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:23,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049164626] [2021-12-21 18:01:23,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:23,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:23,880 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:23,881 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 18:01:23,882 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 18:01:23,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:23,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 18:01:23,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:24,009 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 18:01:24,107 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 18:01:24,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:24,279 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 18:01:24,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049164626] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:24,280 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:24,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-12-21 18:01:24,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575163525] [2021-12-21 18:01:24,280 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:24,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 18:01:24,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:24,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 18:01:24,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-12-21 18:01:24,282 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 18:01:24,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:24,378 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-12-21 18:01:24,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 18:01:24,379 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 18:01:24,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:24,379 INFO L225 Difference]: With dead ends: 45 [2021-12-21 18:01:24,379 INFO L226 Difference]: Without dead ends: 45 [2021-12-21 18:01:24,379 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 18:01:24,380 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, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 18:01:24,380 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 84 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 18:01:24,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-21 18:01:24,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 30. [2021-12-21 18:01:24,382 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 18:01:24,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-12-21 18:01:24,382 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 10 [2021-12-21 18:01:24,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:24,382 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-12-21 18:01:24,382 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 18:01:24,383 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-12-21 18:01:24,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 18:01:24,383 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:24,383 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:24,421 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 18:01:24,600 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 18:01:24,600 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 18:01:24,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:24,601 INFO L85 PathProgramCache]: Analyzing trace with hash 182504998, now seen corresponding path program 1 times [2021-12-21 18:01:24,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:24,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253416493] [2021-12-21 18:01:24,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:24,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:24,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:24,670 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 18:01:24,671 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:24,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253416493] [2021-12-21 18:01:24,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [253416493] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:01:24,671 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:01:24,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-21 18:01:24,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158609564] [2021-12-21 18:01:24,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:01:24,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 18:01:24,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:24,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 18:01:24,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-12-21 18:01:24,673 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 18:01:24,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:24,729 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2021-12-21 18:01:24,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-21 18:01:24,729 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 18:01:24,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:24,730 INFO L225 Difference]: With dead ends: 40 [2021-12-21 18:01:24,730 INFO L226 Difference]: Without dead ends: 40 [2021-12-21 18:01:24,730 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 18:01:24,731 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 18:01:24,731 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 18:01:24,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-12-21 18:01:24,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2021-12-21 18:01:24,733 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 18:01:24,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-12-21 18:01:24,734 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 13 [2021-12-21 18:01:24,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:24,734 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-12-21 18:01:24,734 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 18:01:24,734 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-12-21 18:01:24,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 18:01:24,734 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:24,735 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:24,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-21 18:01:24,735 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 18:01:24,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:24,735 INFO L85 PathProgramCache]: Analyzing trace with hash 883569576, now seen corresponding path program 1 times [2021-12-21 18:01:24,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:24,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941887766] [2021-12-21 18:01:24,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:24,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:24,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:24,826 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 18:01:24,826 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:24,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941887766] [2021-12-21 18:01:24,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941887766] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:01:24,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:01:24,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-21 18:01:24,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771421457] [2021-12-21 18:01:24,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:01:24,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-21 18:01:24,829 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:24,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-21 18:01:24,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-21 18:01:24,830 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 18:01:24,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:24,922 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-12-21 18:01:24,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 18:01:24,922 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 18:01:24,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:24,924 INFO L225 Difference]: With dead ends: 51 [2021-12-21 18:01:24,924 INFO L226 Difference]: Without dead ends: 51 [2021-12-21 18:01:24,925 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 18:01:24,926 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 18:01:24,926 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 18:01:24,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-21 18:01:24,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 38. [2021-12-21 18:01:24,940 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 18:01:24,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-12-21 18:01:24,940 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 13 [2021-12-21 18:01:24,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:24,941 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-12-21 18:01:24,941 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 18:01:24,941 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-12-21 18:01:24,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-21 18:01:24,941 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:24,942 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:24,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-12-21 18:01:24,942 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 18:01:24,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:24,942 INFO L85 PathProgramCache]: Analyzing trace with hash 1361686065, now seen corresponding path program 1 times [2021-12-21 18:01:24,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:24,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169435949] [2021-12-21 18:01:24,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:24,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:24,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:24,994 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 18:01:24,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:24,999 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 18:01:24,999 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:25,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169435949] [2021-12-21 18:01:25,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169435949] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:01:25,000 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:01:25,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 18:01:25,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671664355] [2021-12-21 18:01:25,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:01:25,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 18:01:25,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:25,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 18:01:25,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 18:01:25,001 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 18:01:25,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:25,012 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2021-12-21 18:01:25,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 18:01:25,013 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 18:01:25,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:25,013 INFO L225 Difference]: With dead ends: 37 [2021-12-21 18:01:25,013 INFO L226 Difference]: Without dead ends: 20 [2021-12-21 18:01:25,013 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 18:01:25,014 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 18:01:25,014 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 18:01:25,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-12-21 18:01:25,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-12-21 18:01:25,015 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 18:01:25,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-12-21 18:01:25,016 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2021-12-21 18:01:25,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:25,016 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-12-21 18:01:25,016 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 18:01:25,016 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-12-21 18:01:25,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-21 18:01:25,017 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:25,017 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:25,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-12-21 18:01:25,017 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 18:01:25,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:25,017 INFO L85 PathProgramCache]: Analyzing trace with hash 312590597, now seen corresponding path program 1 times [2021-12-21 18:01:25,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:25,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663937921] [2021-12-21 18:01:25,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:25,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:25,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:25,101 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 18:01:25,101 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:25,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663937921] [2021-12-21 18:01:25,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663937921] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:25,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895914868] [2021-12-21 18:01:25,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:25,102 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:25,102 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:25,103 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 18:01:25,104 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 18:01:25,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:25,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-21 18:01:25,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:25,238 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 18:01:25,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:25,374 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 18:01:25,398 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 18:01:25,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895914868] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:25,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:25,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 20 [2021-12-21 18:01:25,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972094902] [2021-12-21 18:01:25,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:25,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-21 18:01:25,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:25,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-21 18:01:25,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-12-21 18:01:25,401 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 18:01:25,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:25,515 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-12-21 18:01:25,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 18:01:25,516 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 18:01:25,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:25,516 INFO L225 Difference]: With dead ends: 27 [2021-12-21 18:01:25,516 INFO L226 Difference]: Without dead ends: 27 [2021-12-21 18:01:25,517 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2021-12-21 18:01:25,517 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 42 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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 18:01:25,518 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 18:01:25,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-12-21 18:01:25,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 22. [2021-12-21 18:01:25,519 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 18:01:25,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-12-21 18:01:25,519 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-12-21 18:01:25,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:25,520 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-12-21 18:01:25,520 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 18:01:25,520 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-12-21 18:01:25,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-21 18:01:25,521 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:25,521 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:25,554 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-21 18:01:25,754 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 18:01:25,754 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 18:01:25,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:25,754 INFO L85 PathProgramCache]: Analyzing trace with hash 2048380908, now seen corresponding path program 2 times [2021-12-21 18:01:25,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:25,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127089011] [2021-12-21 18:01:25,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:25,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:25,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:25,940 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 18:01:25,941 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:25,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127089011] [2021-12-21 18:01:25,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127089011] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:25,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112127763] [2021-12-21 18:01:25,941 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 18:01:25,941 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:25,942 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:25,942 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 18:01:25,943 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 18:01:25,982 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 18:01:25,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:25,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-21 18:01:25,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:26,036 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 [2021-12-21 18:01:26,338 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 18:01:26,338 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 [2021-12-21 18:01:26,474 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:26,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:26,814 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 [2021-12-21 18:01:26,817 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 [2021-12-21 18:01:26,821 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 [2021-12-21 18:01:26,844 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:26,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112127763] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:26,844 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:26,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 34 [2021-12-21 18:01:26,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985425065] [2021-12-21 18:01:26,844 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:26,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-21 18:01:26,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:26,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-21 18:01:26,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1016, Unknown=0, NotChecked=0, Total=1122 [2021-12-21 18:01:26,846 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) [2021-12-21 18:01:27,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:27,175 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-12-21 18:01:27,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 18:01:27,176 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 [2021-12-21 18:01:27,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:27,176 INFO L225 Difference]: With dead ends: 44 [2021-12-21 18:01:27,176 INFO L226 Difference]: Without dead ends: 35 [2021-12-21 18:01:27,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=202, Invalid=1868, Unknown=0, NotChecked=0, Total=2070 [2021-12-21 18:01:27,177 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 [2021-12-21 18:01:27,178 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] [2021-12-21 18:01:27,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-12-21 18:01:27,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2021-12-21 18:01:27,179 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) [2021-12-21 18:01:27,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-12-21 18:01:27,180 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 21 [2021-12-21 18:01:27,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:27,180 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-12-21 18:01:27,180 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) [2021-12-21 18:01:27,180 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-12-21 18:01:27,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 18:01:27,181 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:27,181 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:27,200 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:27,396 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 [2021-12-21 18:01:27,396 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:27,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:27,397 INFO L85 PathProgramCache]: Analyzing trace with hash 2083749168, now seen corresponding path program 3 times [2021-12-21 18:01:27,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:27,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917437572] [2021-12-21 18:01:27,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:27,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:27,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:27,576 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:27,576 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:27,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917437572] [2021-12-21 18:01:27,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917437572] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:27,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503507499] [2021-12-21 18:01:27,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 18:01:27,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:27,577 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:27,578 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) [2021-12-21 18:01:27,579 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 18:01:27,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-21 18:01:27,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:27,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-21 18:01:27,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:27,708 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 [2021-12-21 18:01:27,846 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 [2021-12-21 18:01:27,852 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:27,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:27,929 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 [2021-12-21 18:01:27,931 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 [2021-12-21 18:01:28,033 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:28,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1503507499] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:28,033 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:28,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2021-12-21 18:01:28,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669552293] [2021-12-21 18:01:28,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:28,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-21 18:01:28,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:28,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-21 18:01:28,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=672, Unknown=0, NotChecked=0, Total=756 [2021-12-21 18:01:28,037 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) [2021-12-21 18:01:28,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:28,238 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2021-12-21 18:01:28,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-21 18:01:28,239 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 [2021-12-21 18:01:28,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:28,240 INFO L225 Difference]: With dead ends: 50 [2021-12-21 18:01:28,240 INFO L226 Difference]: Without dead ends: 37 [2021-12-21 18:01:28,241 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 [2021-12-21 18:01:28,243 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 [2021-12-21 18:01:28,243 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] [2021-12-21 18:01:28,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-21 18:01:28,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2021-12-21 18:01:28,248 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) [2021-12-21 18:01:28,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-12-21 18:01:28,248 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2021-12-21 18:01:28,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:28,249 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-12-21 18:01:28,249 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) [2021-12-21 18:01:28,249 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-12-21 18:01:28,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-21 18:01:28,252 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:28,253 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:28,272 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:28,469 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 [2021-12-21 18:01:28,470 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:28,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:28,470 INFO L85 PathProgramCache]: Analyzing trace with hash 1764143245, now seen corresponding path program 4 times [2021-12-21 18:01:28,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:28,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370902498] [2021-12-21 18:01:28,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:28,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:28,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:28,645 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:28,645 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:28,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370902498] [2021-12-21 18:01:28,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370902498] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:28,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686641145] [2021-12-21 18:01:28,645 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 18:01:28,645 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:28,646 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:28,650 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) [2021-12-21 18:01:28,652 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 18:01:28,722 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 18:01:28,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:28,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-21 18:01:28,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:28,739 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 18:01:28,849 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 [2021-12-21 18:01:29,122 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 18:01:29,122 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 [2021-12-21 18:01:29,248 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:29,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:29,688 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 [2021-12-21 18:01:29,698 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 [2021-12-21 18:01:30,182 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 15 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:30,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686641145] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:30,183 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:30,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 44 [2021-12-21 18:01:30,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829652594] [2021-12-21 18:01:30,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:30,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-21 18:01:30,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:30,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-21 18:01:30,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1795, Unknown=0, NotChecked=0, Total=1980 [2021-12-21 18:01:30,185 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) [2021-12-21 18:01:31,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:31,049 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-12-21 18:01:31,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 18:01:31,050 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 [2021-12-21 18:01:31,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:31,050 INFO L225 Difference]: With dead ends: 44 [2021-12-21 18:01:31,050 INFO L226 Difference]: Without dead ends: 44 [2021-12-21 18:01:31,052 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 [2021-12-21 18:01:31,052 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 [2021-12-21 18:01:31,052 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] [2021-12-21 18:01:31,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-12-21 18:01:31,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2021-12-21 18:01:31,053 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) [2021-12-21 18:01:31,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-12-21 18:01:31,054 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 33 [2021-12-21 18:01:31,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:31,054 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-12-21 18:01:31,054 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) [2021-12-21 18:01:31,054 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-12-21 18:01:31,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-21 18:01:31,055 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:31,055 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:31,076 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:31,272 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 [2021-12-21 18:01:31,272 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:31,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:31,272 INFO L85 PathProgramCache]: Analyzing trace with hash 1125055195, now seen corresponding path program 5 times [2021-12-21 18:01:31,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:31,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939668866] [2021-12-21 18:01:31,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:31,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:31,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:31,476 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:31,476 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:31,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939668866] [2021-12-21 18:01:31,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1939668866] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:31,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160920208] [2021-12-21 18:01:31,476 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 18:01:31,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:31,477 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:31,480 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) [2021-12-21 18:01:31,481 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 18:01:31,532 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-21 18:01:31,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:31,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 42 conjunts are in the unsatisfiable core [2021-12-21 18:01:31,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:31,569 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 18:01:32,070 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:32,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:32,424 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:32,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160920208] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:32,424 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:32,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2021-12-21 18:01:32,425 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297709604] [2021-12-21 18:01:32,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:32,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-21 18:01:32,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:32,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-21 18:01:32,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1276, Unknown=0, NotChecked=0, Total=1482 [2021-12-21 18:01:32,426 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) [2021-12-21 18:01:32,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:32,821 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2021-12-21 18:01:32,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-21 18:01:32,821 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 [2021-12-21 18:01:32,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:32,821 INFO L225 Difference]: With dead ends: 69 [2021-12-21 18:01:32,821 INFO L226 Difference]: Without dead ends: 49 [2021-12-21 18:01:32,822 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=326, Invalid=1930, Unknown=0, NotChecked=0, Total=2256 [2021-12-21 18:01:32,822 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, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 18:01:32,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 147 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 18:01:32,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-12-21 18:01:32,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-12-21 18:01:32,824 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) [2021-12-21 18:01:32,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-12-21 18:01:32,824 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2021-12-21 18:01:32,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:32,824 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-12-21 18:01:32,824 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) [2021-12-21 18:01:32,824 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-12-21 18:01:32,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-21 18:01:32,825 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:32,825 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:32,847 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:33,025 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 [2021-12-21 18:01:33,025 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:33,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:33,026 INFO L85 PathProgramCache]: Analyzing trace with hash 459737784, now seen corresponding path program 6 times [2021-12-21 18:01:33,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:33,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564277018] [2021-12-21 18:01:33,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:33,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:33,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:33,442 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:33,442 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:33,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564277018] [2021-12-21 18:01:33,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564277018] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:33,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274334115] [2021-12-21 18:01:33,443 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 18:01:33,443 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:33,443 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:33,444 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) [2021-12-21 18:01:33,445 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 18:01:33,498 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-21 18:01:33,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:33,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-21 18:01:33,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:33,747 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 [2021-12-21 18:01:33,962 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 [2021-12-21 18:01:33,966 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:33,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:34,068 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 [2021-12-21 18:01:34,069 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 [2021-12-21 18:01:34,223 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:34,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274334115] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:34,223 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:34,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2021-12-21 18:01:34,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413543125] [2021-12-21 18:01:34,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:34,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-21 18:01:34,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:34,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-21 18:01:34,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2021-12-21 18:01:34,224 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) [2021-12-21 18:01:34,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:34,737 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2021-12-21 18:01:34,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-21 18:01:34,737 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 [2021-12-21 18:01:34,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:34,738 INFO L225 Difference]: With dead ends: 74 [2021-12-21 18:01:34,738 INFO L226 Difference]: Without dead ends: 53 [2021-12-21 18:01:34,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=177, Invalid=2079, Unknown=0, NotChecked=0, Total=2256 [2021-12-21 18:01:34,739 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 [2021-12-21 18:01:34,739 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] [2021-12-21 18:01:34,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-12-21 18:01:34,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2021-12-21 18:01:34,740 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) [2021-12-21 18:01:34,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-12-21 18:01:34,740 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 45 [2021-12-21 18:01:34,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:34,740 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-12-21 18:01:34,741 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) [2021-12-21 18:01:34,741 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-12-21 18:01:34,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-21 18:01:34,741 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:34,741 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:34,763 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:34,941 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 [2021-12-21 18:01:34,942 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:34,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:34,942 INFO L85 PathProgramCache]: Analyzing trace with hash -414587883, now seen corresponding path program 7 times [2021-12-21 18:01:34,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:34,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705285278] [2021-12-21 18:01:34,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:34,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:34,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:35,341 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:35,341 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:35,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705285278] [2021-12-21 18:01:35,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705285278] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:35,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309957968] [2021-12-21 18:01:35,342 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 18:01:35,342 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:35,342 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:35,348 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) [2021-12-21 18:01:35,350 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 18:01:35,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:35,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 57 conjunts are in the unsatisfiable core [2021-12-21 18:01:35,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:35,711 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:35,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:36,106 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 18:01:36,157 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:36,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309957968] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:36,157 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:36,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21, 21] total 43 [2021-12-21 18:01:36,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461388658] [2021-12-21 18:01:36,158 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:36,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-21 18:01:36,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:36,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-21 18:01:36,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1729, Unknown=0, NotChecked=0, Total=1892 [2021-12-21 18:01:36,159 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) [2021-12-21 18:01:36,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:36,669 INFO L93 Difference]: Finished difference Result 56 states and 57 transitions. [2021-12-21 18:01:36,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 18:01:36,669 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 [2021-12-21 18:01:36,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:36,670 INFO L225 Difference]: With dead ends: 56 [2021-12-21 18:01:36,670 INFO L226 Difference]: Without dead ends: 56 [2021-12-21 18:01:36,671 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 [2021-12-21 18:01:36,671 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 101 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 18:01:36,671 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 306 Invalid, 833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 820 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 18:01:36,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-12-21 18:01:36,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2021-12-21 18:01:36,672 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) [2021-12-21 18:01:36,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-12-21 18:01:36,673 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 49 [2021-12-21 18:01:36,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:36,673 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-12-21 18:01:36,673 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) [2021-12-21 18:01:36,673 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-12-21 18:01:36,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-21 18:01:36,673 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:36,674 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:36,697 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-12-21 18:01:36,898 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 [2021-12-21 18:01:36,898 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:36,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:36,899 INFO L85 PathProgramCache]: Analyzing trace with hash -1462244612, now seen corresponding path program 8 times [2021-12-21 18:01:36,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:36,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524694396] [2021-12-21 18:01:36,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:36,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:36,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:37,286 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 17 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:37,286 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:37,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524694396] [2021-12-21 18:01:37,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [524694396] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:37,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540487513] [2021-12-21 18:01:37,286 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 18:01:37,286 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:37,286 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:37,287 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) [2021-12-21 18:01:37,333 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 18:01:37,383 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 18:01:37,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:37,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 72 conjunts are in the unsatisfiable core [2021-12-21 18:01:37,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:37,528 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 [2021-12-21 18:01:38,511 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 18:01:38,511 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 [2021-12-21 18:01:38,689 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:38,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:39,719 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 [2021-12-21 18:01:39,722 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 [2021-12-21 18:01:39,725 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 [2021-12-21 18:01:39,765 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:39,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540487513] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:39,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:39,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 66 [2021-12-21 18:01:39,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145319677] [2021-12-21 18:01:39,768 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:39,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-12-21 18:01:39,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:39,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-12-21 18:01:39,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=4043, Unknown=0, NotChecked=0, Total=4290 [2021-12-21 18:01:39,770 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) [2021-12-21 18:01:40,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:40,964 INFO L93 Difference]: Finished difference Result 92 states and 93 transitions. [2021-12-21 18:01:40,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-12-21 18:01:40,965 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 [2021-12-21 18:01:40,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:40,965 INFO L225 Difference]: With dead ends: 92 [2021-12-21 18:01:40,965 INFO L226 Difference]: Without dead ends: 67 [2021-12-21 18:01:40,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=444, Invalid=6866, Unknown=0, NotChecked=0, Total=7310 [2021-12-21 18:01:40,967 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 67 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 667 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 18:01:40,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 578 Invalid, 919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 667 Invalid, 0 Unknown, 240 Unchecked, 0.2s Time] [2021-12-21 18:01:40,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-12-21 18:01:40,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2021-12-21 18:01:40,969 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) [2021-12-21 18:01:40,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-12-21 18:01:40,969 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 53 [2021-12-21 18:01:40,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:40,969 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-12-21 18:01:40,969 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) [2021-12-21 18:01:40,969 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-12-21 18:01:40,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-21 18:01:40,970 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:40,970 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:40,993 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:41,191 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 [2021-12-21 18:01:41,191 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:41,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:41,192 INFO L85 PathProgramCache]: Analyzing trace with hash 329833536, now seen corresponding path program 9 times [2021-12-21 18:01:41,192 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:41,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799148807] [2021-12-21 18:01:41,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:41,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:41,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:41,659 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:41,659 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:41,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799148807] [2021-12-21 18:01:41,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799148807] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:41,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679217139] [2021-12-21 18:01:41,659 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 18:01:41,660 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:41,660 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:41,661 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) [2021-12-21 18:01:41,686 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 18:01:41,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-21 18:01:41,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:41,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 80 conjunts are in the unsatisfiable core [2021-12-21 18:01:41,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:42,051 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 [2021-12-21 18:01:42,336 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 [2021-12-21 18:01:42,342 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:42,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:42,526 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 [2021-12-21 18:01:42,527 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 [2021-12-21 18:01:42,672 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:42,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679217139] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:42,673 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:42,673 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 44 [2021-12-21 18:01:42,673 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963713932] [2021-12-21 18:01:42,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:42,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-21 18:01:42,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:42,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-21 18:01:42,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1772, Unknown=0, NotChecked=0, Total=1892 [2021-12-21 18:01:42,674 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) [2021-12-21 18:01:43,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:43,290 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2021-12-21 18:01:43,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-21 18:01:43,291 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 [2021-12-21 18:01:43,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:43,291 INFO L225 Difference]: With dead ends: 98 [2021-12-21 18:01:43,291 INFO L226 Difference]: Without dead ends: 69 [2021-12-21 18:01:43,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 100 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=213, Invalid=3327, Unknown=0, NotChecked=0, Total=3540 [2021-12-21 18:01:43,293 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, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 18:01:43,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 518 Invalid, 1367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1314 Invalid, 0 Unknown, 44 Unchecked, 0.3s Time] [2021-12-21 18:01:43,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-21 18:01:43,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2021-12-21 18:01:43,294 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) [2021-12-21 18:01:43,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-12-21 18:01:43,294 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2021-12-21 18:01:43,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:43,294 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-12-21 18:01:43,294 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) [2021-12-21 18:01:43,295 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-12-21 18:01:43,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-12-21 18:01:43,295 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:43,295 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:43,324 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:43,507 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 [2021-12-21 18:01:43,507 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:43,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:43,508 INFO L85 PathProgramCache]: Analyzing trace with hash 644832157, now seen corresponding path program 10 times [2021-12-21 18:01:43,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:43,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121764868] [2021-12-21 18:01:43,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:43,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:43,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:43,882 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:43,882 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:43,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121764868] [2021-12-21 18:01:43,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121764868] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:43,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81305576] [2021-12-21 18:01:43,882 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 18:01:43,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:43,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:43,884 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) [2021-12-21 18:01:43,884 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 18:01:43,974 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 18:01:43,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:43,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 88 conjunts are in the unsatisfiable core [2021-12-21 18:01:43,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:43,989 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 18:01:44,301 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 [2021-12-21 18:01:45,053 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 18:01:45,053 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 [2021-12-21 18:01:45,264 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 72 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:45,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:46,437 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 [2021-12-21 18:01:46,441 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 [2021-12-21 18:01:47,539 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 91 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:47,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81305576] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:47,540 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:47,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 29, 29] total 81 [2021-12-21 18:01:47,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6745316] [2021-12-21 18:01:47,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:47,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-12-21 18:01:47,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:47,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-12-21 18:01:47,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=472, Invalid=6170, Unknown=0, NotChecked=0, Total=6642 [2021-12-21 18:01:47,543 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) [2021-12-21 18:01:49,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:49,397 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2021-12-21 18:01:49,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-21 18:01:49,398 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 [2021-12-21 18:01:49,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:49,399 INFO L225 Difference]: With dead ends: 76 [2021-12-21 18:01:49,399 INFO L226 Difference]: Without dead ends: 76 [2021-12-21 18:01:49,401 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=856, Invalid=10274, Unknown=0, NotChecked=0, Total=11130 [2021-12-21 18:01:49,401 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 186 mSDsluCounter, 562 mSDsCounter, 0 mSdLazyCounter, 1702 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s 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 [2021-12-21 18:01:49,401 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] [2021-12-21 18:01:49,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-21 18:01:49,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2021-12-21 18:01:49,403 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) [2021-12-21 18:01:49,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-12-21 18:01:49,403 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 65 [2021-12-21 18:01:49,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:49,404 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-12-21 18:01:49,404 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) [2021-12-21 18:01:49,404 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-12-21 18:01:49,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-12-21 18:01:49,404 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:49,405 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:49,435 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:49,624 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 [2021-12-21 18:01:49,624 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:49,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:49,625 INFO L85 PathProgramCache]: Analyzing trace with hash 851678699, now seen corresponding path program 11 times [2021-12-21 18:01:49,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:49,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039754138] [2021-12-21 18:01:49,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:49,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:49,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:49,948 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 132 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:49,948 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:49,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039754138] [2021-12-21 18:01:49,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039754138] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:49,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258058704] [2021-12-21 18:01:49,949 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 18:01:49,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:49,949 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:49,950 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) [2021-12-21 18:01:49,950 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-21 18:01:50,051 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-12-21 18:01:50,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:50,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 70 conjunts are in the unsatisfiable core [2021-12-21 18:01:50,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:50,075 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 18:01:50,922 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:50,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:51,467 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:51,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258058704] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:51,467 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:51,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 67 [2021-12-21 18:01:51,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353383821] [2021-12-21 18:01:51,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:51,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-12-21 18:01:51,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:51,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-12-21 18:01:51,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=3862, Unknown=0, NotChecked=0, Total=4422 [2021-12-21 18:01:51,469 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) [2021-12-21 18:01:52,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:52,045 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2021-12-21 18:01:52,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-21 18:01:52,045 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 [2021-12-21 18:01:52,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:52,046 INFO L225 Difference]: With dead ends: 117 [2021-12-21 18:01:52,046 INFO L226 Difference]: Without dead ends: 81 [2021-12-21 18:01:52,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2047 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=930, Invalid=6042, Unknown=0, NotChecked=0, Total=6972 [2021-12-21 18:01:52,048 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 93 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 18:01:52,048 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] [2021-12-21 18:01:52,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-12-21 18:01:52,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2021-12-21 18:01:52,049 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) [2021-12-21 18:01:52,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2021-12-21 18:01:52,050 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 73 [2021-12-21 18:01:52,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:52,050 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2021-12-21 18:01:52,050 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) [2021-12-21 18:01:52,050 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2021-12-21 18:01:52,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-12-21 18:01:52,050 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:52,050 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:52,071 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-12-21 18:01:52,267 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 [2021-12-21 18:01:52,267 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:52,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:52,268 INFO L85 PathProgramCache]: Analyzing trace with hash -228789816, now seen corresponding path program 12 times [2021-12-21 18:01:52,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:52,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376758292] [2021-12-21 18:01:52,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:52,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:52,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:52,782 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:52,782 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:52,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376758292] [2021-12-21 18:01:52,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376758292] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:52,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537985526] [2021-12-21 18:01:52,783 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 18:01:52,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:52,783 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:52,784 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) [2021-12-21 18:01:52,812 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-21 18:01:52,900 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-12-21 18:01:52,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:52,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 100 conjunts are in the unsatisfiable core [2021-12-21 18:01:52,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:53,242 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 [2021-12-21 18:01:53,529 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 [2021-12-21 18:01:53,534 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:53,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:53,691 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 [2021-12-21 18:01:53,693 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 [2021-12-21 18:01:53,946 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:53,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537985526] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:53,947 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:53,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 52 [2021-12-21 18:01:53,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19968914] [2021-12-21 18:01:53,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:53,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-12-21 18:01:53,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:53,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-12-21 18:01:53,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2514, Unknown=0, NotChecked=0, Total=2652 [2021-12-21 18:01:53,948 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) [2021-12-21 18:01:55,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:55,048 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2021-12-21 18:01:55,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-21 18:01:55,050 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 [2021-12-21 18:01:55,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:55,051 INFO L225 Difference]: With dead ends: 122 [2021-12-21 18:01:55,051 INFO L226 Difference]: Without dead ends: 85 [2021-12-21 18:01:55,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 129 SyntacticMatches, 6 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=249, Invalid=4863, Unknown=0, NotChecked=0, Total=5112 [2021-12-21 18:01:55,052 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 [2021-12-21 18:01:55,052 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] [2021-12-21 18:01:55,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-12-21 18:01:55,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2021-12-21 18:01:55,053 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) [2021-12-21 18:01:55,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-12-21 18:01:55,053 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2021-12-21 18:01:55,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:55,054 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-12-21 18:01:55,054 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) [2021-12-21 18:01:55,054 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-12-21 18:01:55,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-12-21 18:01:55,054 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:55,054 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:55,071 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:55,255 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 [2021-12-21 18:01:55,255 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:55,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:55,256 INFO L85 PathProgramCache]: Analyzing trace with hash 1274746661, now seen corresponding path program 13 times [2021-12-21 18:01:55,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:55,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769857073] [2021-12-21 18:01:55,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:55,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:55,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:55,867 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 91 proven. 224 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:55,867 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:55,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769857073] [2021-12-21 18:01:55,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769857073] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:55,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917771354] [2021-12-21 18:01:55,867 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 18:01:55,867 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:55,867 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:55,868 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) [2021-12-21 18:01:55,869 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-21 18:01:55,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:55,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 93 conjunts are in the unsatisfiable core [2021-12-21 18:01:55,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:56,505 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:56,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:01:57,373 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 18:01:57,434 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:57,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917771354] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:01:57,434 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:01:57,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 33, 33] total 67 [2021-12-21 18:01:57,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974949290] [2021-12-21 18:01:57,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:01:57,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-12-21 18:01:57,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:01:57,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-12-21 18:01:57,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=4225, Unknown=0, NotChecked=0, Total=4556 [2021-12-21 18:01:57,436 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) [2021-12-21 18:01:58,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:01:58,420 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2021-12-21 18:01:58,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-21 18:01:58,421 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 [2021-12-21 18:01:58,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:01:58,421 INFO L225 Difference]: With dead ends: 88 [2021-12-21 18:01:58,421 INFO L226 Difference]: Without dead ends: 88 [2021-12-21 18:01:58,422 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 [2021-12-21 18:01:58,422 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, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 18:01:58,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 713 Invalid, 2032 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2015 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-21 18:01:58,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-12-21 18:01:58,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2021-12-21 18:01:58,424 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) [2021-12-21 18:01:58,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-12-21 18:01:58,424 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 81 [2021-12-21 18:01:58,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:01:58,424 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-12-21 18:01:58,425 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) [2021-12-21 18:01:58,425 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-12-21 18:01:58,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-12-21 18:01:58,425 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:01:58,425 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:01:58,449 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-21 18:01:58,625 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 [2021-12-21 18:01:58,626 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:01:58,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:01:58,626 INFO L85 PathProgramCache]: Analyzing trace with hash 479794700, now seen corresponding path program 14 times [2021-12-21 18:01:58,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:01:58,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004981567] [2021-12-21 18:01:58,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:01:58,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:01:58,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:01:59,210 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 29 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:01:59,210 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:01:59,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004981567] [2021-12-21 18:01:59,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004981567] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:01:59,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470531614] [2021-12-21 18:01:59,211 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 18:01:59,211 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:01:59,211 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:01:59,212 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) [2021-12-21 18:01:59,213 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-21 18:01:59,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 18:01:59,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:01:59,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 108 conjunts are in the unsatisfiable core [2021-12-21 18:01:59,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:01:59,527 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 [2021-12-21 18:02:01,761 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 18:02:01,762 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 [2021-12-21 18:02:02,023 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:02,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:02:03,957 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 [2021-12-21 18:02:03,960 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 [2021-12-21 18:02:03,963 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 [2021-12-21 18:02:04,065 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:04,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470531614] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:02:04,065 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:02:04,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37] total 98 [2021-12-21 18:02:04,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710457360] [2021-12-21 18:02:04,065 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:02:04,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-12-21 18:02:04,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:02:04,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-12-21 18:02:04,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=9051, Unknown=0, NotChecked=0, Total=9506 [2021-12-21 18:02:04,067 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) [2021-12-21 18:02:08,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:02:08,373 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2021-12-21 18:02:08,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-12-21 18:02:08,374 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 [2021-12-21 18:02:08,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:02:08,374 INFO L225 Difference]: With dead ends: 140 [2021-12-21 18:02:08,375 INFO L226 Difference]: Without dead ends: 99 [2021-12-21 18:02:08,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2154 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=792, Invalid=14958, Unknown=0, NotChecked=0, Total=15750 [2021-12-21 18:02:08,376 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 99 mSDsluCounter, 1210 mSDsCounter, 0 mSdLazyCounter, 1620 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s 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, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 18:02:08,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 1246 Invalid, 2151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1620 Invalid, 0 Unknown, 514 Unchecked, 0.5s Time] [2021-12-21 18:02:08,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-12-21 18:02:08,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 94. [2021-12-21 18:02:08,378 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) [2021-12-21 18:02:08,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-12-21 18:02:08,378 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 85 [2021-12-21 18:02:08,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:02:08,378 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-12-21 18:02:08,378 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) [2021-12-21 18:02:08,378 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-12-21 18:02:08,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-12-21 18:02:08,379 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:02:08,379 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:02:08,413 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-21 18:02:08,587 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 [2021-12-21 18:02:08,587 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:02:08,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:02:08,588 INFO L85 PathProgramCache]: Analyzing trace with hash -790148272, now seen corresponding path program 15 times [2021-12-21 18:02:08,588 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:02:08,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672199399] [2021-12-21 18:02:08,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:02:08,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:02:08,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:02:09,115 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:09,116 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:02:09,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672199399] [2021-12-21 18:02:09,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672199399] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:02:09,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209398990] [2021-12-21 18:02:09,117 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 18:02:09,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:02:09,117 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:02:09,118 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) [2021-12-21 18:02:09,119 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-21 18:02:09,268 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-12-21 18:02:09,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:02:09,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 120 conjunts are in the unsatisfiable core [2021-12-21 18:02:09,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:02:09,769 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 [2021-12-21 18:02:10,104 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 [2021-12-21 18:02:10,114 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:10,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:02:10,326 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 [2021-12-21 18:02:10,328 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 [2021-12-21 18:02:10,641 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:10,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209398990] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:02:10,641 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:02:10,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 60 [2021-12-21 18:02:10,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816114969] [2021-12-21 18:02:10,641 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:02:10,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-12-21 18:02:10,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:02:10,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-12-21 18:02:10,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=3384, Unknown=0, NotChecked=0, Total=3540 [2021-12-21 18:02:10,643 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) [2021-12-21 18:02:12,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:02:12,347 INFO L93 Difference]: Finished difference Result 146 states and 147 transitions. [2021-12-21 18:02:12,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-12-21 18:02:12,347 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 [2021-12-21 18:02:12,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:02:12,348 INFO L225 Difference]: With dead ends: 146 [2021-12-21 18:02:12,348 INFO L226 Difference]: Without dead ends: 101 [2021-12-21 18:02:12,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 160 SyntacticMatches, 5 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=285, Invalid=6687, Unknown=0, NotChecked=0, Total=6972 [2021-12-21 18:02:12,349 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 73 mSDsluCounter, 1017 mSDsCounter, 0 mSdLazyCounter, 2818 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s 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, 1.0s IncrementalHoareTripleChecker+Time [2021-12-21 18:02:12,349 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 1053 Invalid, 2893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 2818 Invalid, 0 Unknown, 62 Unchecked, 1.0s Time] [2021-12-21 18:02:12,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-12-21 18:02:12,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 98. [2021-12-21 18:02:12,350 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) [2021-12-21 18:02:12,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-12-21 18:02:12,360 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 93 [2021-12-21 18:02:12,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:02:12,361 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-12-21 18:02:12,361 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) [2021-12-21 18:02:12,361 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-12-21 18:02:12,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-12-21 18:02:12,362 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:02:12,362 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:02:12,408 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-21 18:02:12,579 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 [2021-12-21 18:02:12,580 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:02:12,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:02:12,580 INFO L85 PathProgramCache]: Analyzing trace with hash 156309165, now seen corresponding path program 16 times [2021-12-21 18:02:12,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:02:12,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900948639] [2021-12-21 18:02:12,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:02:12,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:02:12,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:02:13,312 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 153 proven. 320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:13,312 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:02:13,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900948639] [2021-12-21 18:02:13,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1900948639] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:02:13,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103801257] [2021-12-21 18:02:13,312 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 18:02:13,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:02:13,313 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:02:13,323 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) [2021-12-21 18:02:13,324 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-21 18:02:13,415 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 18:02:13,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:02:13,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 124 conjunts are in the unsatisfiable core [2021-12-21 18:02:13,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:02:13,436 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 18:02:14,135 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 [2021-12-21 18:02:15,654 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 18:02:15,654 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 [2021-12-21 18:02:15,925 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 200 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:15,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:02:18,317 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 [2021-12-21 18:02:18,319 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 [2021-12-21 18:02:20,292 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 231 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:20,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103801257] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:02:20,292 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:02:20,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 41, 41] total 117 [2021-12-21 18:02:20,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938694494] [2021-12-21 18:02:20,292 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:02:20,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2021-12-21 18:02:20,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:02:20,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2021-12-21 18:02:20,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=906, Invalid=12900, Unknown=0, NotChecked=0, Total=13806 [2021-12-21 18:02:20,295 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) [2021-12-21 18:02:23,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:02:23,739 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2021-12-21 18:02:23,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-12-21 18:02:23,739 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 [2021-12-21 18:02:23,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:02:23,740 INFO L225 Difference]: With dead ends: 108 [2021-12-21 18:02:23,740 INFO L226 Difference]: Without dead ends: 108 [2021-12-21 18:02:23,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3666 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=1528, Invalid=20822, Unknown=0, NotChecked=0, Total=22350 [2021-12-21 18:02:23,741 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 254 mSDsluCounter, 1137 mSDsCounter, 0 mSdLazyCounter, 3408 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 1177 SdHoareTripleChecker+Invalid, 3569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 3408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 120 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-12-21 18:02:23,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 1177 Invalid, 3569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 3408 Invalid, 0 Unknown, 120 Unchecked, 1.3s Time] [2021-12-21 18:02:23,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-12-21 18:02:23,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2021-12-21 18:02:23,743 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) [2021-12-21 18:02:23,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2021-12-21 18:02:23,743 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 97 [2021-12-21 18:02:23,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:02:23,743 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2021-12-21 18:02:23,743 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) [2021-12-21 18:02:23,744 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2021-12-21 18:02:23,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-12-21 18:02:23,744 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:02:23,744 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:02:23,762 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-21 18:02:23,951 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 [2021-12-21 18:02:23,951 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:02:23,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:02:23,952 INFO L85 PathProgramCache]: Analyzing trace with hash -436125445, now seen corresponding path program 17 times [2021-12-21 18:02:23,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:02:23,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806834819] [2021-12-21 18:02:23,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:02:23,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:02:23,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:02:24,593 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 292 proven. 277 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:24,593 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:02:24,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806834819] [2021-12-21 18:02:24,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806834819] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:02:24,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796174748] [2021-12-21 18:02:24,594 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 18:02:24,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:02:24,594 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:02:24,608 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) [2021-12-21 18:02:24,610 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-21 18:02:24,739 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-12-21 18:02:24,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:02:24,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 98 conjunts are in the unsatisfiable core [2021-12-21 18:02:24,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:02:24,753 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 18:02:26,436 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:26,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:02:27,384 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:27,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796174748] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:02:27,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:02:27,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 96 [2021-12-21 18:02:27,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106159943] [2021-12-21 18:02:27,385 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:02:27,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-12-21 18:02:27,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:02:27,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-12-21 18:02:27,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1173, Invalid=7947, Unknown=0, NotChecked=0, Total=9120 [2021-12-21 18:02:27,386 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) [2021-12-21 18:02:27,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:02:27,866 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2021-12-21 18:02:27,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-12-21 18:02:27,866 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 [2021-12-21 18:02:27,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:02:27,867 INFO L225 Difference]: With dead ends: 165 [2021-12-21 18:02:27,867 INFO L226 Difference]: Without dead ends: 113 [2021-12-21 18:02:27,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3696 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1651, Invalid=10339, Unknown=0, NotChecked=0, Total=11990 [2021-12-21 18:02:27,868 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 102 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 931 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 18:02:27,868 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 323 Invalid, 944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 931 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 18:02:27,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-12-21 18:02:27,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 110. [2021-12-21 18:02:27,870 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) [2021-12-21 18:02:27,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2021-12-21 18:02:27,871 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 105 [2021-12-21 18:02:27,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:02:27,871 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2021-12-21 18:02:27,871 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) [2021-12-21 18:02:27,872 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2021-12-21 18:02:27,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-12-21 18:02:27,872 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:02:27,872 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:02:27,892 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-12-21 18:02:28,095 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 [2021-12-21 18:02:28,095 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:02:28,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:02:28,096 INFO L85 PathProgramCache]: Analyzing trace with hash 1420552408, now seen corresponding path program 18 times [2021-12-21 18:02:28,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:02:28,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163041758] [2021-12-21 18:02:28,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:02:28,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:02:28,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:02:28,742 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:28,742 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:02:28,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163041758] [2021-12-21 18:02:28,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163041758] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:02:28,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661449879] [2021-12-21 18:02:28,743 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 18:02:28,743 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:02:28,743 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:02:28,744 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) [2021-12-21 18:02:28,760 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-21 18:02:28,997 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-12-21 18:02:28,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:02:29,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 140 conjunts are in the unsatisfiable core [2021-12-21 18:02:29,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:02:29,599 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 [2021-12-21 18:02:29,909 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 [2021-12-21 18:02:29,914 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:29,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:02:30,132 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 [2021-12-21 18:02:30,133 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 [2021-12-21 18:02:30,618 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:30,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661449879] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:02:30,619 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:02:30,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 68 [2021-12-21 18:02:30,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696884505] [2021-12-21 18:02:30,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:02:30,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-12-21 18:02:30,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:02:30,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-12-21 18:02:30,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=4382, Unknown=0, NotChecked=0, Total=4556 [2021-12-21 18:02:30,621 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) [2021-12-21 18:02:32,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:02:32,800 INFO L93 Difference]: Finished difference Result 170 states and 171 transitions. [2021-12-21 18:02:32,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-12-21 18:02:32,801 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 [2021-12-21 18:02:32,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:02:32,801 INFO L225 Difference]: With dead ends: 170 [2021-12-21 18:02:32,801 INFO L226 Difference]: Without dead ends: 117 [2021-12-21 18:02:32,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 185 SyntacticMatches, 10 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=321, Invalid=8799, Unknown=0, NotChecked=0, Total=9120 [2021-12-21 18:02:32,802 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 87 mSDsluCounter, 1445 mSDsCounter, 0 mSdLazyCounter, 4056 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s 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, 1.3s IncrementalHoareTripleChecker+Time [2021-12-21 18:02:32,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 1487 Invalid, 4145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 4056 Invalid, 0 Unknown, 73 Unchecked, 1.3s Time] [2021-12-21 18:02:32,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-12-21 18:02:32,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 114. [2021-12-21 18:02:32,804 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) [2021-12-21 18:02:32,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2021-12-21 18:02:32,804 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 109 [2021-12-21 18:02:32,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:02:32,804 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2021-12-21 18:02:32,805 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) [2021-12-21 18:02:32,805 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2021-12-21 18:02:32,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-12-21 18:02:32,805 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:02:32,805 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:02:32,825 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-12-21 18:02:33,015 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 [2021-12-21 18:02:33,015 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-21 18:02:33,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:02:33,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1680516555, now seen corresponding path program 19 times [2021-12-21 18:02:33,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:02:33,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771047307] [2021-12-21 18:02:33,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:02:33,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:02:33,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:02:33,664 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 231 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:33,664 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:02:33,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771047307] [2021-12-21 18:02:33,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771047307] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:02:33,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351591993] [2021-12-21 18:02:33,665 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 18:02:33,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:02:33,665 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:02:33,666 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) [2021-12-21 18:02:33,667 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-21 18:02:33,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:02:33,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 129 conjunts are in the unsatisfiable core [2021-12-21 18:02:33,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:02:34,291 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 276 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:34,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:02:35,199 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 18:02:35,265 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 276 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:02:35,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351591993] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:02:35,266 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:02:35,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 45] total 92 [2021-12-21 18:02:35,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103138879] [2021-12-21 18:02:35,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:02:35,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-12-21 18:02:35,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:02:35,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-12-21 18:02:35,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=659, Invalid=7897, Unknown=0, NotChecked=0, Total=8556 [2021-12-21 18:02:35,268 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand has 93 states, 89 states have (on average 2.235955056179775) internal successors, (199), 64 states have internal predecessors, (199), 30 states have call successors, (30), 29 states have call predecessors, (30), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)