./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 35987657 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-?-3598765 [2022-07-21 16:59:18,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-21 16:59:18,461 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-21 16:59:18,502 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-21 16:59:18,502 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-21 16:59:18,504 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-21 16:59:18,507 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-21 16:59:18,510 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-21 16:59:18,512 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-21 16:59:18,525 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-21 16:59:18,526 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-21 16:59:18,531 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-21 16:59:18,531 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-21 16:59:18,533 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-21 16:59:18,534 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-21 16:59:18,537 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-21 16:59:18,537 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-21 16:59:18,539 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-21 16:59:18,540 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-21 16:59:18,546 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-21 16:59:18,547 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-21 16:59:18,548 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-21 16:59:18,550 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-21 16:59:18,551 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-21 16:59:18,552 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-21 16:59:18,559 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-21 16:59:18,559 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-21 16:59:18,559 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-21 16:59:18,560 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-21 16:59:18,560 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-21 16:59:18,561 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-21 16:59:18,562 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-21 16:59:18,563 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-21 16:59:18,564 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-21 16:59:18,565 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-21 16:59:18,566 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-21 16:59:18,566 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-21 16:59:18,567 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-21 16:59:18,567 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-21 16:59:18,567 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-21 16:59:18,568 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-21 16:59:18,569 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-21 16:59:18,577 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2022-07-21 16:59:18,609 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-21 16:59:18,610 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-21 16:59:18,610 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-21 16:59:18,610 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-21 16:59:18,611 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-21 16:59:18,611 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-21 16:59:18,612 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-21 16:59:18,612 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-21 16:59:18,612 INFO L138 SettingsManager]: * Use SBE=true [2022-07-21 16:59:18,613 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-21 16:59:18,613 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-21 16:59:18,614 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-21 16:59:18,614 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-21 16:59:18,614 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-21 16:59:18,614 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-21 16:59:18,615 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-21 16:59:18,615 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-21 16:59:18,615 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-07-21 16:59:18,615 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-21 16:59:18,615 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-21 16:59:18,616 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-21 16:59:18,616 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-21 16:59:18,616 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-21 16:59:18,616 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-21 16:59:18,616 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-21 16:59:18,617 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 16:59:18,617 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-21 16:59:18,617 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-21 16:59:18,617 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-21 16:59:18,617 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-21 16:59:18,618 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 60396cce4fa0936fb91e88a54a287214045469c9d9b3d447954681e0a5aabbc0 [2022-07-21 16:59:18,905 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-21 16:59:18,924 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-21 16:59:18,926 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-21 16:59:18,927 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-21 16:59:18,929 INFO L275 PluginConnector]: CDTParser initialized [2022-07-21 16:59:18,930 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2022-07-21 16:59:18,987 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff6d8afba/e0a4e08df8e04a1f95414ef379a73b19/FLAGc2fc4839d [2022-07-21 16:59:19,506 INFO L306 CDTParser]: Found 1 translation units. [2022-07-21 16:59:19,507 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2022-07-21 16:59:19,520 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff6d8afba/e0a4e08df8e04a1f95414ef379a73b19/FLAGc2fc4839d [2022-07-21 16:59:19,838 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff6d8afba/e0a4e08df8e04a1f95414ef379a73b19 [2022-07-21 16:59:19,841 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-21 16:59:19,842 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-21 16:59:19,845 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-21 16:59:19,845 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-21 16:59:19,847 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-21 16:59:19,848 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:59:19" (1/1) ... [2022-07-21 16:59:19,849 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c0595cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:19, skipping insertion in model container [2022-07-21 16:59:19,849 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:59:19" (1/1) ... [2022-07-21 16:59:19,855 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-21 16:59:19,877 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-21 16:59:20,135 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 16:59:20,141 INFO L203 MainTranslator]: Completed pre-run [2022-07-21 16:59:20,178 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 16:59:20,208 INFO L208 MainTranslator]: Completed translation [2022-07-21 16:59:20,209 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20 WrapperNode [2022-07-21 16:59:20,209 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-21 16:59:20,210 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-21 16:59:20,210 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-21 16:59:20,211 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-21 16:59:20,217 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,238 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,262 INFO L137 Inliner]: procedures = 117, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 29 [2022-07-21 16:59:20,262 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-21 16:59:20,263 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-21 16:59:20,263 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-21 16:59:20,263 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-21 16:59:20,269 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,270 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,281 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,281 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,291 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,294 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,295 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,296 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-21 16:59:20,297 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-21 16:59:20,297 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-21 16:59:20,297 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-21 16:59:20,298 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (1/1) ... [2022-07-21 16:59:20,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 16:59:20,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:20,331 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-21 16:59:20,353 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-21 16:59:20,371 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-07-21 16:59:20,371 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-07-21 16:59:20,372 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-21 16:59:20,372 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-21 16:59:20,372 INFO L130 BoogieDeclarations]: Found specification of procedure strlen_rec [2022-07-21 16:59:20,373 INFO L138 BoogieDeclarations]: Found implementation of procedure strlen_rec [2022-07-21 16:59:20,373 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-21 16:59:20,373 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-21 16:59:20,492 INFO L234 CfgBuilder]: Building ICFG [2022-07-21 16:59:20,493 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-21 16:59:20,611 INFO L275 CfgBuilder]: Performing block encoding [2022-07-21 16:59:20,616 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-21 16:59:20,616 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-07-21 16:59:20,618 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:59:20 BoogieIcfgContainer [2022-07-21 16:59:20,618 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-21 16:59:20,620 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-21 16:59:20,620 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-21 16:59:20,622 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-21 16:59:20,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:59:19" (1/3) ... [2022-07-21 16:59:20,623 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24400de1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:59:20, skipping insertion in model container [2022-07-21 16:59:20,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:20" (2/3) ... [2022-07-21 16:59:20,623 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24400de1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:59:20, skipping insertion in model container [2022-07-21 16:59:20,624 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:59:20" (3/3) ... [2022-07-21 16:59:20,625 INFO L111 eAbstractionObserver]: Analyzing ICFG rec_strlen-alloca-1.i [2022-07-21 16:59:20,636 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-21 16:59:20,637 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 7 error locations. [2022-07-21 16:59:20,671 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-21 16:59:20,681 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2e0572de, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@29aafbc8 [2022-07-21 16:59:20,681 INFO L358 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2022-07-21 16:59:20,686 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 16:59:20,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-21 16:59:20,698 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:20,698 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-21 16:59:20,699 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:20,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:20,704 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2022-07-21 16:59:20,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:20,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927855711] [2022-07-21 16:59:20,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:20,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:20,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:20,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:20,908 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:20,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927855711] [2022-07-21 16:59:20,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [927855711] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:59:20,910 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:59:20,910 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-21 16:59:20,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183170069] [2022-07-21 16:59:20,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:59:20,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 16:59:20,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:20,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 16:59:20,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:59:20,944 INFO L87 Difference]: Start difference. First operand has 28 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:21,004 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2022-07-21 16:59:21,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 16:59:21,007 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-07-21 16:59:21,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:21,012 INFO L225 Difference]: With dead ends: 39 [2022-07-21 16:59:21,013 INFO L226 Difference]: Without dead ends: 35 [2022-07-21 16:59:21,014 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:59:21,017 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 9 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:21,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 71 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 16:59:21,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-07-21 16:59:21,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2022-07-21 16:59:21,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.5) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 16:59:21,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-07-21 16:59:21,060 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 6 [2022-07-21 16:59:21,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:21,060 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-07-21 16:59:21,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,061 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-07-21 16:59:21,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-21 16:59:21,061 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:21,061 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-21 16:59:21,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-21 16:59:21,063 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:21,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:21,063 INFO L85 PathProgramCache]: Analyzing trace with hash 889508820, now seen corresponding path program 1 times [2022-07-21 16:59:21,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:21,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567362847] [2022-07-21 16:59:21,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:21,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:21,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:21,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:21,128 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:21,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567362847] [2022-07-21 16:59:21,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [567362847] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:59:21,129 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:59:21,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 16:59:21,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267912191] [2022-07-21 16:59:21,129 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:59:21,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 16:59:21,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:21,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 16:59:21,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 16:59:21,132 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:21,156 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2022-07-21 16:59:21,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 16:59:21,157 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-07-21 16:59:21,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:21,160 INFO L225 Difference]: With dead ends: 26 [2022-07-21 16:59:21,160 INFO L226 Difference]: Without dead ends: 26 [2022-07-21 16:59:21,160 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 16:59:21,161 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 7 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:21,162 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 32 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 16:59:21,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-07-21 16:59:21,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-07-21 16:59:21,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 22 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 16:59:21,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-07-21 16:59:21,168 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 6 [2022-07-21 16:59:21,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:21,169 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-07-21 16:59:21,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,169 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-07-21 16:59:21,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-21 16:59:21,170 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:21,170 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-21 16:59:21,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-21 16:59:21,170 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:21,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:21,171 INFO L85 PathProgramCache]: Analyzing trace with hash 889508821, now seen corresponding path program 1 times [2022-07-21 16:59:21,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:21,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706932533] [2022-07-21 16:59:21,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:21,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:21,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:21,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:21,223 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:21,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706932533] [2022-07-21 16:59:21,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1706932533] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:59:21,223 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:59:21,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 16:59:21,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103681576] [2022-07-21 16:59:21,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:59:21,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 16:59:21,229 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:21,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 16:59:21,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:59:21,230 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:21,249 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-07-21 16:59:21,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 16:59:21,249 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-07-21 16:59:21,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:21,250 INFO L225 Difference]: With dead ends: 25 [2022-07-21 16:59:21,250 INFO L226 Difference]: Without dead ends: 25 [2022-07-21 16:59:21,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:59:21,251 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 10 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:21,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 40 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 16:59:21,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-07-21 16:59:21,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-07-21 16:59:21,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 21 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 16:59:21,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-07-21 16:59:21,256 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 6 [2022-07-21 16:59:21,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:21,256 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-07-21 16:59:21,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,256 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-07-21 16:59:21,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-21 16:59:21,257 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:21,257 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-21 16:59:21,257 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-07-21 16:59:21,257 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:21,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:21,258 INFO L85 PathProgramCache]: Analyzing trace with hash 889568456, now seen corresponding path program 1 times [2022-07-21 16:59:21,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:21,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594647217] [2022-07-21 16:59:21,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:21,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:21,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:21,295 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:21,295 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:21,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594647217] [2022-07-21 16:59:21,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594647217] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:59:21,296 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:59:21,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 16:59:21,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004096461] [2022-07-21 16:59:21,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:59:21,297 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 16:59:21,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:21,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 16:59:21,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:59:21,298 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:21,332 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-07-21 16:59:21,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 16:59:21,333 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-07-21 16:59:21,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:21,334 INFO L225 Difference]: With dead ends: 34 [2022-07-21 16:59:21,334 INFO L226 Difference]: Without dead ends: 34 [2022-07-21 16:59:21,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-07-21 16:59:21,335 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 23 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:21,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 47 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 16:59:21,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-07-21 16:59:21,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2022-07-21 16:59:21,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.35) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 16:59:21,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2022-07-21 16:59:21,340 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 6 [2022-07-21 16:59:21,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:21,340 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2022-07-21 16:59:21,340 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,341 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2022-07-21 16:59:21,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-07-21 16:59:21,341 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:21,341 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:21,341 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-07-21 16:59:21,342 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting strlen_recErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:21,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:21,342 INFO L85 PathProgramCache]: Analyzing trace with hash -590943170, now seen corresponding path program 1 times [2022-07-21 16:59:21,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:21,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107298811] [2022-07-21 16:59:21,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:21,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:21,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:21,378 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:21,378 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:21,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107298811] [2022-07-21 16:59:21,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107298811] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:59:21,378 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:59:21,379 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-21 16:59:21,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238305703] [2022-07-21 16:59:21,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:59:21,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-21 16:59:21,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:21,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-21 16:59:21,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-21 16:59:21,381 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 5 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:21,417 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2022-07-21 16:59:21,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-21 16:59:21,418 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-07-21 16:59:21,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:21,419 INFO L225 Difference]: With dead ends: 26 [2022-07-21 16:59:21,419 INFO L226 Difference]: Without dead ends: 26 [2022-07-21 16:59:21,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-07-21 16:59:21,420 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 19 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:21,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 34 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 16:59:21,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-07-21 16:59:21,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-07-21 16:59:21,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.3) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 16:59:21,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2022-07-21 16:59:21,424 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 9 [2022-07-21 16:59:21,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:21,424 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2022-07-21 16:59:21,424 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,425 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2022-07-21 16:59:21,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-07-21 16:59:21,425 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:21,425 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:21,425 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-07-21 16:59:21,426 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:21,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:21,426 INFO L85 PathProgramCache]: Analyzing trace with hash -590943169, now seen corresponding path program 1 times [2022-07-21 16:59:21,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:21,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055569896] [2022-07-21 16:59:21,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:21,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:21,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:21,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:21,488 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:21,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055569896] [2022-07-21 16:59:21,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055569896] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:59:21,489 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:59:21,489 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-21 16:59:21,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679902375] [2022-07-21 16:59:21,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:59:21,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 16:59:21,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:21,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 16:59:21,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-07-21 16:59:21,491 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:21,548 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2022-07-21 16:59:21,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-21 16:59:21,548 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-07-21 16:59:21,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:21,550 INFO L225 Difference]: With dead ends: 33 [2022-07-21 16:59:21,551 INFO L226 Difference]: Without dead ends: 33 [2022-07-21 16:59:21,551 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-07-21 16:59:21,555 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 28 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:21,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 59 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 16:59:21,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-07-21 16:59:21,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-07-21 16:59:21,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.28) internal successors, (32), 27 states have internal predecessors, (32), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 16:59:21,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2022-07-21 16:59:21,569 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 9 [2022-07-21 16:59:21,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:21,569 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2022-07-21 16:59:21,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:21,569 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2022-07-21 16:59:21,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-21 16:59:21,570 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:21,570 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:21,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-07-21 16:59:21,571 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:21,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:21,571 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2022-07-21 16:59:21,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:21,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796253894] [2022-07-21 16:59:21,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:21,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:21,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:21,638 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:21,639 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:21,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796253894] [2022-07-21 16:59:21,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796253894] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:21,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1400025250] [2022-07-21 16:59:21,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:21,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:21,640 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:21,647 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:21,653 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-21 16:59:21,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:21,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 12 conjunts are in the unsatisfiable core [2022-07-21 16:59:21,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:21,754 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:59:21,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:21,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:21,987 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:21,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1400025250] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:21,988 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:21,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2022-07-21 16:59:21,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673501601] [2022-07-21 16:59:21,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:21,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-21 16:59:21,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:21,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-21 16:59:21,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2022-07-21 16:59:21,992 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:22,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:22,115 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2022-07-21 16:59:22,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-21 16:59:22,116 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-07-21 16:59:22,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:22,117 INFO L225 Difference]: With dead ends: 45 [2022-07-21 16:59:22,117 INFO L226 Difference]: Without dead ends: 45 [2022-07-21 16:59:22,119 INFO L412 NwaCegarLoop]: 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 [2022-07-21 16:59:22,120 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 34 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:22,121 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 84 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 16:59:22,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-07-21 16:59:22,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 30. [2022-07-21 16:59:22,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 16:59:22,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-07-21 16:59:22,131 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 10 [2022-07-21 16:59:22,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:22,131 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-07-21 16:59:22,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:22,133 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-07-21 16:59:22,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-21 16:59:22,134 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:22,134 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:22,161 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:22,348 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:22,348 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:22,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:22,349 INFO L85 PathProgramCache]: Analyzing trace with hash 182504998, now seen corresponding path program 1 times [2022-07-21 16:59:22,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:22,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303862229] [2022-07-21 16:59:22,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:22,349 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:22,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:22,475 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:22,475 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:22,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303862229] [2022-07-21 16:59:22,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1303862229] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:59:22,476 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:59:22,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-07-21 16:59:22,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201499207] [2022-07-21 16:59:22,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:59:22,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-21 16:59:22,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:22,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-21 16:59:22,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-07-21 16:59:22,484 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:22,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:22,583 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2022-07-21 16:59:22,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-21 16:59:22,587 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-07-21 16:59:22,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:22,588 INFO L225 Difference]: With dead ends: 40 [2022-07-21 16:59:22,588 INFO L226 Difference]: Without dead ends: 40 [2022-07-21 16:59:22,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2022-07-21 16:59:22,589 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:22,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 93 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 16:59:22,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-07-21 16:59:22,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2022-07-21 16:59:22,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 30 states have internal predecessors, (33), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-07-21 16:59:22,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2022-07-21 16:59:22,600 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 13 [2022-07-21 16:59:22,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:22,600 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2022-07-21 16:59:22,600 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:22,601 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2022-07-21 16:59:22,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-21 16:59:22,601 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:22,601 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:22,602 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-07-21 16:59:22,602 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:22,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:22,603 INFO L85 PathProgramCache]: Analyzing trace with hash 883569576, now seen corresponding path program 1 times [2022-07-21 16:59:22,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:22,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658055647] [2022-07-21 16:59:22,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:22,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:22,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:22,714 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:22,715 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:22,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658055647] [2022-07-21 16:59:22,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658055647] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:59:22,715 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:59:22,715 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-07-21 16:59:22,715 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592253295] [2022-07-21 16:59:22,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:59:22,716 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-21 16:59:22,716 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:22,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-21 16:59:22,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-07-21 16:59:22,717 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:22,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:22,823 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2022-07-21 16:59:22,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 16:59:22,823 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-07-21 16:59:22,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:22,825 INFO L225 Difference]: With dead ends: 51 [2022-07-21 16:59:22,825 INFO L226 Difference]: Without dead ends: 51 [2022-07-21 16:59:22,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-07-21 16:59:22,825 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:22,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 88 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 16:59:22,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-07-21 16:59:22,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 38. [2022-07-21 16:59:22,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.206896551724138) internal successors, (35), 31 states have internal predecessors, (35), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-07-21 16:59:22,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2022-07-21 16:59:22,829 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 13 [2022-07-21 16:59:22,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:22,829 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2022-07-21 16:59:22,830 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:22,830 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2022-07-21 16:59:22,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-07-21 16:59:22,830 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:22,830 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:22,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-07-21 16:59:22,831 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:22,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:22,831 INFO L85 PathProgramCache]: Analyzing trace with hash 1361686065, now seen corresponding path program 1 times [2022-07-21 16:59:22,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:22,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694727900] [2022-07-21 16:59:22,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:22,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:22,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:22,885 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-07-21 16:59:22,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:22,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:22,891 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:22,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694727900] [2022-07-21 16:59:22,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694727900] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:59:22,892 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:59:22,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 16:59:22,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822993495] [2022-07-21 16:59:22,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:59:22,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 16:59:22,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:22,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 16:59:22,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:59:22,893 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-21 16:59:22,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:22,912 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2022-07-21 16:59:22,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 16:59:22,913 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-07-21 16:59:22,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:22,913 INFO L225 Difference]: With dead ends: 37 [2022-07-21 16:59:22,913 INFO L226 Difference]: Without dead ends: 20 [2022-07-21 16:59:22,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:59:22,914 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 5 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:22,914 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 41 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 16:59:22,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-07-21 16:59:22,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2022-07-21 16:59:22,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:22,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-07-21 16:59:22,916 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2022-07-21 16:59:22,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:22,917 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-07-21 16:59:22,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-21 16:59:22,917 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-07-21 16:59:22,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-21 16:59:22,917 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:22,917 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:22,918 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-07-21 16:59:22,918 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:22,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:22,918 INFO L85 PathProgramCache]: Analyzing trace with hash 312590597, now seen corresponding path program 1 times [2022-07-21 16:59:22,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:22,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490521978] [2022-07-21 16:59:22,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:22,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:22,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:23,032 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:23,032 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:23,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490521978] [2022-07-21 16:59:23,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490521978] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:23,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48311315] [2022-07-21 16:59:23,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:23,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:23,033 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:23,035 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:23,039 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-21 16:59:23,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:23,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 21 conjunts are in the unsatisfiable core [2022-07-21 16:59:23,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:23,216 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:23,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:23,368 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-21 16:59:23,395 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:23,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48311315] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:23,396 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:23,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 20 [2022-07-21 16:59:23,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231897] [2022-07-21 16:59:23,396 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:23,397 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-07-21 16:59:23,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:23,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-07-21 16:59:23,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2022-07-21 16:59:23,398 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 21 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:23,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:23,537 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-07-21 16:59:23,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-21 16:59:23,538 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-07-21 16:59:23,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:23,538 INFO L225 Difference]: With dead ends: 27 [2022-07-21 16:59:23,538 INFO L226 Difference]: Without dead ends: 27 [2022-07-21 16:59:23,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2022-07-21 16:59:23,539 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 42 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:23,539 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 55 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 16:59:23,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-07-21 16:59:23,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 22. [2022-07-21 16:59:23,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:23,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-07-21 16:59:23,541 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2022-07-21 16:59:23,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:23,542 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-07-21 16:59:23,542 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:23,542 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-07-21 16:59:23,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-07-21 16:59:23,542 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:23,542 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:23,575 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:23,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-07-21 16:59:23,768 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:23,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:23,768 INFO L85 PathProgramCache]: Analyzing trace with hash 2048380908, now seen corresponding path program 2 times [2022-07-21 16:59:23,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:23,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914107857] [2022-07-21 16:59:23,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:23,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:23,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:23,981 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:23,981 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:23,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914107857] [2022-07-21 16:59:23,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914107857] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:23,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175730747] [2022-07-21 16:59:23,982 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:59:23,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:23,982 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:23,984 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:23,985 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-21 16:59:24,026 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:59:24,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:24,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 36 conjunts are in the unsatisfiable core [2022-07-21 16:59:24,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:24,076 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 16:59:24,381 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 16:59:24,382 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2022-07-21 16:59:24,536 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:24,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:24,964 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 16:59:24,968 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-07-21 16:59:25,007 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 16:59:25,042 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:25,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175730747] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:25,043 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:25,043 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 34 [2022-07-21 16:59:25,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058999943] [2022-07-21 16:59:25,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:25,044 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-07-21 16:59:25,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:25,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-07-21 16:59:25,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1016, Unknown=0, NotChecked=0, Total=1122 [2022-07-21 16:59:25,045 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 26 states have internal predecessors, (42), 9 states have call successors, (9), 9 states have call predecessors, (9), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:27,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:27,505 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2022-07-21 16:59:27,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-07-21 16:59:27,506 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 26 states have internal predecessors, (42), 9 states have call successors, (9), 9 states have call predecessors, (9), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-07-21 16:59:27,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:27,506 INFO L225 Difference]: With dead ends: 44 [2022-07-21 16:59:27,506 INFO L226 Difference]: Without dead ends: 35 [2022-07-21 16:59:27,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=202, Invalid=1868, Unknown=0, NotChecked=0, Total=2070 [2022-07-21 16:59:27,508 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 37 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:27,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 106 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 87 Invalid, 0 Unknown, 114 Unchecked, 0.1s Time] [2022-07-21 16:59:27,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-07-21 16:59:27,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2022-07-21 16:59:27,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:27,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-07-21 16:59:27,511 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 21 [2022-07-21 16:59:27,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:27,511 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-07-21 16:59:27,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 26 states have internal predecessors, (42), 9 states have call successors, (9), 9 states have call predecessors, (9), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:27,511 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-07-21 16:59:27,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-21 16:59:27,512 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:27,512 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:27,538 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:27,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:27,713 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:27,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:27,714 INFO L85 PathProgramCache]: Analyzing trace with hash 2083749168, now seen corresponding path program 3 times [2022-07-21 16:59:27,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:27,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207531305] [2022-07-21 16:59:27,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:27,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:27,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:27,951 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:27,951 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:27,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207531305] [2022-07-21 16:59:27,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207531305] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:27,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482821933] [2022-07-21 16:59:27,952 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 16:59:27,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:27,952 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:27,954 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:27,955 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-21 16:59:28,014 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-21 16:59:28,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:28,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 40 conjunts are in the unsatisfiable core [2022-07-21 16:59:28,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:28,124 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 16:59:28,267 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 16:59:28,269 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:28,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:28,352 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 16:59:28,355 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 16:59:28,478 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:28,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482821933] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:28,478 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:28,478 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2022-07-21 16:59:28,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4379714] [2022-07-21 16:59:28,478 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:28,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-07-21 16:59:28,479 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:28,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-07-21 16:59:28,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=672, Unknown=0, NotChecked=0, Total=756 [2022-07-21 16:59:28,480 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 28 states, 25 states have (on average 1.92) internal successors, (48), 23 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:28,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:28,715 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2022-07-21 16:59:28,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-07-21 16:59:28,716 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 1.92) internal successors, (48), 23 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-07-21 16:59:28,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:28,717 INFO L225 Difference]: With dead ends: 50 [2022-07-21 16:59:28,717 INFO L226 Difference]: Without dead ends: 37 [2022-07-21 16:59:28,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=141, Invalid=1119, Unknown=0, NotChecked=0, Total=1260 [2022-07-21 16:59:28,718 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:28,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 108 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 195 Invalid, 0 Unknown, 51 Unchecked, 0.1s Time] [2022-07-21 16:59:28,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-07-21 16:59:28,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2022-07-21 16:59:28,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:28,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2022-07-21 16:59:28,721 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2022-07-21 16:59:28,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:28,722 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2022-07-21 16:59:28,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 1.92) internal successors, (48), 23 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:28,722 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2022-07-21 16:59:28,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-07-21 16:59:28,723 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:28,723 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:28,748 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:28,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:28,947 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:28,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:28,948 INFO L85 PathProgramCache]: Analyzing trace with hash 1764143245, now seen corresponding path program 4 times [2022-07-21 16:59:28,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:28,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540220513] [2022-07-21 16:59:28,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:28,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:28,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:29,147 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:29,148 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:29,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540220513] [2022-07-21 16:59:29,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540220513] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:29,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811124385] [2022-07-21 16:59:29,148 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-21 16:59:29,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:29,148 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:29,150 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:29,172 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-21 16:59:29,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-21 16:59:29,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:29,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 52 conjunts are in the unsatisfiable core [2022-07-21 16:59:29,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:29,220 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:59:29,329 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-07-21 16:59:29,612 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 16:59:29,613 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-07-21 16:59:29,779 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:29,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:30,321 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 16:59:30,334 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 16:59:30,804 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 15 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:30,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811124385] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:30,805 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:30,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 44 [2022-07-21 16:59:30,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916865732] [2022-07-21 16:59:30,805 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:30,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-07-21 16:59:30,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:30,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-07-21 16:59:30,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1795, Unknown=0, NotChecked=0, Total=1980 [2022-07-21 16:59:30,818 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 45 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 33 states have internal predecessors, (77), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:31,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:31,736 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2022-07-21 16:59:31,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-21 16:59:31,736 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 33 states have internal predecessors, (77), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-07-21 16:59:31,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:31,737 INFO L225 Difference]: With dead ends: 44 [2022-07-21 16:59:31,737 INFO L226 Difference]: Without dead ends: 44 [2022-07-21 16:59:31,738 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=363, Invalid=3177, Unknown=0, NotChecked=0, Total=3540 [2022-07-21 16:59:31,739 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 69 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:31,739 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 203 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 513 Invalid, 0 Unknown, 53 Unchecked, 0.3s Time] [2022-07-21 16:59:31,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-07-21 16:59:31,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-07-21 16:59:31,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:31,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-07-21 16:59:31,742 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 33 [2022-07-21 16:59:31,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:31,743 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-07-21 16:59:31,743 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 33 states have internal predecessors, (77), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:31,743 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-07-21 16:59:31,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-07-21 16:59:31,744 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:31,744 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:31,769 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-07-21 16:59:31,963 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-07-21 16:59:31,964 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:31,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:31,964 INFO L85 PathProgramCache]: Analyzing trace with hash 1125055195, now seen corresponding path program 5 times [2022-07-21 16:59:31,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:31,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062958590] [2022-07-21 16:59:31,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:31,965 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:31,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:32,157 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:32,157 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:32,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062958590] [2022-07-21 16:59:32,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062958590] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:32,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38985206] [2022-07-21 16:59:32,157 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-21 16:59:32,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:32,158 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:32,160 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:32,168 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-21 16:59:32,223 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2022-07-21 16:59:32,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:32,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 42 conjunts are in the unsatisfiable core [2022-07-21 16:59:32,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:32,236 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:59:32,662 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:32,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:32,924 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:32,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38985206] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:32,925 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:32,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2022-07-21 16:59:32,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720596327] [2022-07-21 16:59:32,925 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:32,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-07-21 16:59:32,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:32,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-07-21 16:59:32,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1276, Unknown=0, NotChecked=0, Total=1482 [2022-07-21 16:59:32,927 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 28 states have internal predecessors, (82), 13 states have call successors, (13), 12 states have call predecessors, (13), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:33,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:33,272 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2022-07-21 16:59:33,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-07-21 16:59:33,273 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 28 states have internal predecessors, (82), 13 states have call successors, (13), 12 states have call predecessors, (13), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-07-21 16:59:33,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:33,273 INFO L225 Difference]: With dead ends: 69 [2022-07-21 16:59:33,273 INFO L226 Difference]: Without dead ends: 49 [2022-07-21 16:59:33,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=326, Invalid=1930, Unknown=0, NotChecked=0, Total=2256 [2022-07-21 16:59:33,275 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 59 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:33,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 147 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 16:59:33,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-07-21 16:59:33,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2022-07-21 16:59:33,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:33,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2022-07-21 16:59:33,278 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2022-07-21 16:59:33,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:33,278 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2022-07-21 16:59:33,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 28 states have internal predecessors, (82), 13 states have call successors, (13), 12 states have call predecessors, (13), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:33,279 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2022-07-21 16:59:33,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-07-21 16:59:33,279 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:33,280 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:33,299 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:33,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-07-21 16:59:33,492 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:33,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:33,492 INFO L85 PathProgramCache]: Analyzing trace with hash 459737784, now seen corresponding path program 6 times [2022-07-21 16:59:33,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:33,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231327536] [2022-07-21 16:59:33,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:33,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:33,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:33,810 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:33,810 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:33,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231327536] [2022-07-21 16:59:33,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1231327536] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:33,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234574012] [2022-07-21 16:59:33,810 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-21 16:59:33,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:33,811 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:33,816 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:33,817 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-21 16:59:33,884 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-07-21 16:59:33,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:33,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 60 conjunts are in the unsatisfiable core [2022-07-21 16:59:33,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:34,061 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 16:59:34,230 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 16:59:34,232 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:34,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:34,335 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 16:59:34,337 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 16:59:34,495 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:34,495 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234574012] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:34,496 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:34,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2022-07-21 16:59:34,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734591371] [2022-07-21 16:59:34,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:34,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-07-21 16:59:34,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:34,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-07-21 16:59:34,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2022-07-21 16:59:34,498 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 36 states, 33 states have (on average 2.121212121212121) internal successors, (70), 29 states have internal predecessors, (70), 10 states have call successors, (10), 8 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:35,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:35,013 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2022-07-21 16:59:35,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-07-21 16:59:35,014 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.121212121212121) internal successors, (70), 29 states have internal predecessors, (70), 10 states have call successors, (10), 8 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2022-07-21 16:59:35,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:35,014 INFO L225 Difference]: With dead ends: 74 [2022-07-21 16:59:35,015 INFO L226 Difference]: Without dead ends: 53 [2022-07-21 16:59:35,015 INFO L412 NwaCegarLoop]: 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 [2022-07-21 16:59:35,016 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 54 mSDsluCounter, 243 mSDsCounter, 0 mSdLazyCounter, 644 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 644 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:35,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 261 Invalid, 685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 644 Invalid, 0 Unknown, 33 Unchecked, 0.3s Time] [2022-07-21 16:59:35,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-07-21 16:59:35,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2022-07-21 16:59:35,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:35,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2022-07-21 16:59:35,019 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 45 [2022-07-21 16:59:35,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:35,019 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2022-07-21 16:59:35,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.121212121212121) internal successors, (70), 29 states have internal predecessors, (70), 10 states have call successors, (10), 8 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:35,019 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2022-07-21 16:59:35,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-07-21 16:59:35,020 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:35,020 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:35,047 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:35,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:35,221 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:35,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:35,222 INFO L85 PathProgramCache]: Analyzing trace with hash -414587883, now seen corresponding path program 7 times [2022-07-21 16:59:35,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:35,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451223747] [2022-07-21 16:59:35,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:35,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:35,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:35,518 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:35,518 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:35,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451223747] [2022-07-21 16:59:35,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451223747] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:35,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627645621] [2022-07-21 16:59:35,519 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-21 16:59:35,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:35,519 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:35,524 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:35,525 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-07-21 16:59:35,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:35,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 57 conjunts are in the unsatisfiable core [2022-07-21 16:59:35,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:35,848 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:35,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:36,227 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-21 16:59:36,265 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:36,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627645621] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:36,265 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:36,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21, 21] total 43 [2022-07-21 16:59:36,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079000200] [2022-07-21 16:59:36,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:36,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-07-21 16:59:36,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:36,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-07-21 16:59:36,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1729, Unknown=0, NotChecked=0, Total=1892 [2022-07-21 16:59:36,267 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 44 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 31 states have internal predecessors, (87), 14 states have call successors, (14), 13 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:36,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:36,780 INFO L93 Difference]: Finished difference Result 56 states and 57 transitions. [2022-07-21 16:59:36,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-21 16:59:36,780 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 31 states have internal predecessors, (87), 14 states have call successors, (14), 13 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2022-07-21 16:59:36,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:36,781 INFO L225 Difference]: With dead ends: 56 [2022-07-21 16:59:36,781 INFO L226 Difference]: Without dead ends: 56 [2022-07-21 16:59:36,782 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=290, Invalid=2680, Unknown=0, NotChecked=0, Total=2970 [2022-07-21 16:59:36,782 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 101 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 823 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:36,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 303 Invalid, 836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 823 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-21 16:59:36,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-07-21 16:59:36,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2022-07-21 16:59:36,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 7 states have call successors, (7), 7 states have call predecessors, (7), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:36,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-07-21 16:59:36,785 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 49 [2022-07-21 16:59:36,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:36,786 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-07-21 16:59:36,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 31 states have internal predecessors, (87), 14 states have call successors, (14), 13 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:36,786 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-07-21 16:59:36,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-07-21 16:59:36,787 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:36,787 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:36,813 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:37,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-07-21 16:59:37,004 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:37,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:37,004 INFO L85 PathProgramCache]: Analyzing trace with hash -1462244612, now seen corresponding path program 8 times [2022-07-21 16:59:37,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:37,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287146265] [2022-07-21 16:59:37,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:37,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:37,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:37,339 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 17 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:37,340 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:37,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287146265] [2022-07-21 16:59:37,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287146265] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:37,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384903987] [2022-07-21 16:59:37,340 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:59:37,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:37,340 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:37,348 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:37,349 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-07-21 16:59:37,412 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:59:37,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:37,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 72 conjunts are in the unsatisfiable core [2022-07-21 16:59:37,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:37,551 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 16:59:38,412 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 16:59:38,413 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2022-07-21 16:59:38,611 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:38,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:39,694 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 16:59:39,698 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 16:59:39,702 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 27 [2022-07-21 16:59:39,762 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:39,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384903987] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:39,762 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:39,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 66 [2022-07-21 16:59:39,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822646321] [2022-07-21 16:59:39,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:39,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-07-21 16:59:39,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:39,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-07-21 16:59:39,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=4043, Unknown=0, NotChecked=0, Total=4290 [2022-07-21 16:59:39,764 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 66 states, 61 states have (on average 1.8032786885245902) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 21 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:43,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:43,483 INFO L93 Difference]: Finished difference Result 92 states and 93 transitions. [2022-07-21 16:59:43,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-07-21 16:59:43,484 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 61 states have (on average 1.8032786885245902) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 21 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2022-07-21 16:59:43,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:43,484 INFO L225 Difference]: With dead ends: 92 [2022-07-21 16:59:43,484 INFO L226 Difference]: Without dead ends: 67 [2022-07-21 16:59:43,486 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 972 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=444, Invalid=6866, Unknown=0, NotChecked=0, Total=7310 [2022-07-21 16:59:43,486 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 67 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 680 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 505 SdHoareTripleChecker+Invalid, 967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 275 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:43,487 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 505 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 680 Invalid, 0 Unknown, 275 Unchecked, 0.3s Time] [2022-07-21 16:59:43,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-07-21 16:59:43,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2022-07-21 16:59:43,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 8 states have call successors, (8), 8 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:43,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-07-21 16:59:43,496 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 53 [2022-07-21 16:59:43,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:43,496 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-07-21 16:59:43,497 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 61 states have (on average 1.8032786885245902) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 21 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:43,497 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-07-21 16:59:43,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-07-21 16:59:43,501 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:43,501 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:43,519 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:43,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-07-21 16:59:43,707 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:43,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:43,708 INFO L85 PathProgramCache]: Analyzing trace with hash 329833536, now seen corresponding path program 9 times [2022-07-21 16:59:43,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:43,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824440660] [2022-07-21 16:59:43,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:43,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:43,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:44,213 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:44,213 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:44,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824440660] [2022-07-21 16:59:44,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824440660] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:44,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958971337] [2022-07-21 16:59:44,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 16:59:44,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:44,214 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:44,215 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:44,217 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-07-21 16:59:44,306 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-07-21 16:59:44,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:44,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 80 conjunts are in the unsatisfiable core [2022-07-21 16:59:44,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:44,531 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 16:59:44,716 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 16:59:44,719 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:44,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:44,871 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 16:59:44,872 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 16:59:45,071 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:45,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958971337] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:45,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:45,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 44 [2022-07-21 16:59:45,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105496314] [2022-07-21 16:59:45,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:45,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-07-21 16:59:45,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:45,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-07-21 16:59:45,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1772, Unknown=0, NotChecked=0, Total=1892 [2022-07-21 16:59:45,074 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 44 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 35 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:46,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:46,034 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2022-07-21 16:59:46,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-07-21 16:59:46,035 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 35 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2022-07-21 16:59:46,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:46,035 INFO L225 Difference]: With dead ends: 98 [2022-07-21 16:59:46,035 INFO L226 Difference]: Without dead ends: 69 [2022-07-21 16:59:46,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 100 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=213, Invalid=3327, Unknown=0, NotChecked=0, Total=3540 [2022-07-21 16:59:46,037 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 51 mSDsluCounter, 478 mSDsCounter, 0 mSdLazyCounter, 1330 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 502 SdHoareTripleChecker+Invalid, 1383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:46,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 502 Invalid, 1383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1330 Invalid, 0 Unknown, 44 Unchecked, 0.5s Time] [2022-07-21 16:59:46,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-07-21 16:59:46,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2022-07-21 16:59:46,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 8 states have call successors, (8), 8 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:46,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2022-07-21 16:59:46,040 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2022-07-21 16:59:46,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:46,040 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2022-07-21 16:59:46,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 35 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:46,041 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2022-07-21 16:59:46,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-07-21 16:59:46,041 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:46,042 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:46,060 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:46,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:46,247 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:46,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:46,248 INFO L85 PathProgramCache]: Analyzing trace with hash 644832157, now seen corresponding path program 10 times [2022-07-21 16:59:46,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:46,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570641041] [2022-07-21 16:59:46,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:46,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:46,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:46,643 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:46,643 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:46,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570641041] [2022-07-21 16:59:46,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570641041] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:46,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735803322] [2022-07-21 16:59:46,643 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-21 16:59:46,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:46,644 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:46,645 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:46,645 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-07-21 16:59:46,708 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-21 16:59:46,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:46,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 88 conjunts are in the unsatisfiable core [2022-07-21 16:59:46,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:46,721 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:59:47,087 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-07-21 16:59:47,836 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 16:59:47,836 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-07-21 16:59:48,034 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 72 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:48,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:49,211 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 16:59:49,214 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 16:59:50,202 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 91 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:50,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735803322] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:50,203 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:50,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 29, 29] total 81 [2022-07-21 16:59:50,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111655194] [2022-07-21 16:59:50,203 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:50,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-07-21 16:59:50,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:50,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-07-21 16:59:50,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=472, Invalid=6170, Unknown=0, NotChecked=0, Total=6642 [2022-07-21 16:59:50,206 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 82 states, 77 states have (on average 2.142857142857143) internal successors, (165), 58 states have internal predecessors, (165), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:52,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:52,243 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2022-07-21 16:59:52,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-07-21 16:59:52,243 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 77 states have (on average 2.142857142857143) internal successors, (165), 58 states have internal predecessors, (165), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2022-07-21 16:59:52,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:52,244 INFO L225 Difference]: With dead ends: 76 [2022-07-21 16:59:52,244 INFO L226 Difference]: Without dead ends: 76 [2022-07-21 16:59:52,246 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=856, Invalid=10274, Unknown=0, NotChecked=0, Total=11130 [2022-07-21 16:59:52,246 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 186 mSDsluCounter, 562 mSDsCounter, 0 mSdLazyCounter, 1702 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 1833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:52,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 590 Invalid, 1833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1702 Invalid, 0 Unknown, 96 Unchecked, 0.7s Time] [2022-07-21 16:59:52,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-07-21 16:59:52,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2022-07-21 16:59:52,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:52,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2022-07-21 16:59:52,250 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 65 [2022-07-21 16:59:52,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:52,250 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2022-07-21 16:59:52,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 77 states have (on average 2.142857142857143) internal successors, (165), 58 states have internal predecessors, (165), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:52,251 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2022-07-21 16:59:52,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-07-21 16:59:52,251 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:52,252 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:52,269 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:52,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:52,459 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:52,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:52,460 INFO L85 PathProgramCache]: Analyzing trace with hash 851678699, now seen corresponding path program 11 times [2022-07-21 16:59:52,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:52,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688765996] [2022-07-21 16:59:52,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:52,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:52,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:52,821 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 132 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:52,821 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:52,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688765996] [2022-07-21 16:59:52,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688765996] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:52,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87307997] [2022-07-21 16:59:52,822 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-21 16:59:52,822 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:52,822 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:52,823 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:52,824 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-07-21 16:59:52,929 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2022-07-21 16:59:52,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:52,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 70 conjunts are in the unsatisfiable core [2022-07-21 16:59:52,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:52,942 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:59:53,798 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:53,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:54,282 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:54,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87307997] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:54,283 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:54,283 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 67 [2022-07-21 16:59:54,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996646710] [2022-07-21 16:59:54,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:54,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-07-21 16:59:54,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:54,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-07-21 16:59:54,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=3862, Unknown=0, NotChecked=0, Total=4422 [2022-07-21 16:59:54,285 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 48 states have internal predecessors, (154), 21 states have call successors, (21), 20 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:54,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:54,904 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2022-07-21 16:59:54,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-07-21 16:59:54,905 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 48 states have internal predecessors, (154), 21 states have call successors, (21), 20 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2022-07-21 16:59:54,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:54,906 INFO L225 Difference]: With dead ends: 117 [2022-07-21 16:59:54,906 INFO L226 Difference]: Without dead ends: 81 [2022-07-21 16:59:54,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2047 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=930, Invalid=6042, Unknown=0, NotChecked=0, Total=6972 [2022-07-21 16:59:54,907 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 93 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:54,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 249 Invalid, 718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-21 16:59:54,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-07-21 16:59:54,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2022-07-21 16:59:54,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:54,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2022-07-21 16:59:54,910 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 73 [2022-07-21 16:59:54,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:54,911 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2022-07-21 16:59:54,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 48 states have internal predecessors, (154), 21 states have call successors, (21), 20 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:54,911 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2022-07-21 16:59:54,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-07-21 16:59:54,912 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:54,912 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:54,930 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-07-21 16:59:55,119 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-07-21 16:59:55,119 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:55,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:55,120 INFO L85 PathProgramCache]: Analyzing trace with hash -228789816, now seen corresponding path program 12 times [2022-07-21 16:59:55,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:55,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270364493] [2022-07-21 16:59:55,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:55,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:55,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:55,719 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:55,720 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:55,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270364493] [2022-07-21 16:59:55,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270364493] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:55,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441607495] [2022-07-21 16:59:55,720 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-21 16:59:55,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:55,720 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:55,722 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:55,725 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-07-21 16:59:55,839 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-07-21 16:59:55,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:59:55,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 100 conjunts are in the unsatisfiable core [2022-07-21 16:59:55,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:56,156 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 16:59:56,393 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 16:59:56,395 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:56,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:59:56,551 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 16:59:56,568 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 16:59:56,810 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:56,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [441607495] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:59:56,810 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 16:59:56,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 52 [2022-07-21 16:59:56,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47569903] [2022-07-21 16:59:56,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 16:59:56,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-07-21 16:59:56,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 16:59:56,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-07-21 16:59:56,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2514, Unknown=0, NotChecked=0, Total=2652 [2022-07-21 16:59:56,811 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 52 states, 49 states have (on average 2.326530612244898) internal successors, (114), 41 states have internal predecessors, (114), 14 states have call successors, (14), 12 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:58,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:59:58,117 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2022-07-21 16:59:58,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-07-21 16:59:58,117 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 49 states have (on average 2.326530612244898) internal successors, (114), 41 states have internal predecessors, (114), 14 states have call successors, (14), 12 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2022-07-21 16:59:58,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:59:58,118 INFO L225 Difference]: With dead ends: 122 [2022-07-21 16:59:58,118 INFO L226 Difference]: Without dead ends: 85 [2022-07-21 16:59:58,119 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 129 SyntacticMatches, 6 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=249, Invalid=4863, Unknown=0, NotChecked=0, Total=5112 [2022-07-21 16:59:58,119 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 68 mSDsluCounter, 709 mSDsCounter, 0 mSdLazyCounter, 1956 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 739 SdHoareTripleChecker+Invalid, 2072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1956 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-07-21 16:59:58,120 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 739 Invalid, 2072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1956 Invalid, 0 Unknown, 105 Unchecked, 0.7s Time] [2022-07-21 16:59:58,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-07-21 16:59:58,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2022-07-21 16:59:58,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:58,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2022-07-21 16:59:58,126 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2022-07-21 16:59:58,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:59:58,126 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2022-07-21 16:59:58,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 49 states have (on average 2.326530612244898) internal successors, (114), 41 states have internal predecessors, (114), 14 states have call successors, (14), 12 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 16:59:58,127 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2022-07-21 16:59:58,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-07-21 16:59:58,127 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:59:58,128 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:59:58,145 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-07-21 16:59:58,331 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-07-21 16:59:58,332 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 16:59:58,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:59:58,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1274746661, now seen corresponding path program 13 times [2022-07-21 16:59:58,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 16:59:58,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891665115] [2022-07-21 16:59:58,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:59:58,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 16:59:58,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:58,911 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 91 proven. 224 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:58,911 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 16:59:58,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891665115] [2022-07-21 16:59:58,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [891665115] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:59:58,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993743306] [2022-07-21 16:59:58,912 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-21 16:59:58,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:59:58,912 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:59:58,916 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:59:58,918 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-07-21 16:59:58,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:59:58,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 93 conjunts are in the unsatisfiable core [2022-07-21 16:59:58,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:59:59,483 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:59:59,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:00:00,345 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-21 17:00:00,407 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:00,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993743306] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:00:00,407 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:00:00,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 33, 33] total 67 [2022-07-21 17:00:00,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034125595] [2022-07-21 17:00:00,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:00:00,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-07-21 17:00:00,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:00:00,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-07-21 17:00:00,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=4225, Unknown=0, NotChecked=0, Total=4556 [2022-07-21 17:00:00,415 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 68 states, 65 states have (on average 2.2) internal successors, (143), 47 states have internal predecessors, (143), 22 states have call successors, (22), 21 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:01,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:00:01,618 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2022-07-21 17:00:01,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-07-21 17:00:01,619 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 65 states have (on average 2.2) internal successors, (143), 47 states have internal predecessors, (143), 22 states have call successors, (22), 21 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2022-07-21 17:00:01,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:00:01,619 INFO L225 Difference]: With dead ends: 88 [2022-07-21 17:00:01,619 INFO L226 Difference]: Without dead ends: 88 [2022-07-21 17:00:01,620 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 123 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1383 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=640, Invalid=6842, Unknown=0, NotChecked=0, Total=7482 [2022-07-21 17:00:01,621 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 180 mSDsluCounter, 675 mSDsCounter, 0 mSdLazyCounter, 2018 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 710 SdHoareTripleChecker+Invalid, 2035 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2018 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-07-21 17:00:01,621 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 710 Invalid, 2035 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2018 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-07-21 17:00:01,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-07-21 17:00:01,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2022-07-21 17:00:01,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 11 states have call successors, (11), 11 states have call predecessors, (11), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:01,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2022-07-21 17:00:01,624 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 81 [2022-07-21 17:00:01,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:00:01,624 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2022-07-21 17:00:01,624 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 65 states have (on average 2.2) internal successors, (143), 47 states have internal predecessors, (143), 22 states have call successors, (22), 21 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:01,624 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2022-07-21 17:00:01,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-07-21 17:00:01,625 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:00:01,625 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:00:01,644 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-07-21 17:00:01,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:01,831 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:00:01,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:00:01,832 INFO L85 PathProgramCache]: Analyzing trace with hash 479794700, now seen corresponding path program 14 times [2022-07-21 17:00:01,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:00:01,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319958393] [2022-07-21 17:00:01,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:00:01,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:00:01,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:00:02,456 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 29 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:02,456 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:00:02,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319958393] [2022-07-21 17:00:02,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1319958393] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:00:02,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438048618] [2022-07-21 17:00:02,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 17:00:02,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:02,457 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:00:02,458 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:00:02,463 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-07-21 17:00:02,539 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 17:00:02,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:00:02,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 108 conjunts are in the unsatisfiable core [2022-07-21 17:00:02,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:00:02,837 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 17:00:04,494 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:00:04,495 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2022-07-21 17:00:04,824 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:04,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:00:06,884 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:00:06,887 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:00:06,890 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 27 [2022-07-21 17:00:06,956 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:06,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1438048618] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:00:06,956 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:00:06,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37] total 98 [2022-07-21 17:00:06,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321512419] [2022-07-21 17:00:06,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:00:06,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2022-07-21 17:00:06,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:00:06,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2022-07-21 17:00:06,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=9051, Unknown=0, NotChecked=0, Total=9506 [2022-07-21 17:00:06,959 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 98 states, 93 states have (on average 1.913978494623656) internal successors, (178), 66 states have internal predecessors, (178), 33 states have call successors, (33), 33 states have call predecessors, (33), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:09,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:00:09,373 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2022-07-21 17:00:09,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-07-21 17:00:09,374 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 [2022-07-21 17:00:09,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:00:09,374 INFO L225 Difference]: With dead ends: 140 [2022-07-21 17:00:09,375 INFO L226 Difference]: Without dead ends: 99 [2022-07-21 17:00:09,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2153 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=792, Invalid=14958, Unknown=0, NotChecked=0, Total=15750 [2022-07-21 17:00:09,377 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 99 mSDsluCounter, 1086 mSDsCounter, 0 mSdLazyCounter, 1634 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 1122 SdHoareTripleChecker+Invalid, 2243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 592 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-07-21 17:00:09,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 1122 Invalid, 2243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1634 Invalid, 0 Unknown, 592 Unchecked, 0.6s Time] [2022-07-21 17:00:09,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-07-21 17:00:09,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 94. [2022-07-21 17:00:09,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:09,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2022-07-21 17:00:09,380 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 85 [2022-07-21 17:00:09,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:00:09,380 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2022-07-21 17:00:09,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 93 states have (on average 1.913978494623656) internal successors, (178), 66 states have internal predecessors, (178), 33 states have call successors, (33), 33 states have call predecessors, (33), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:09,381 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2022-07-21 17:00:09,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-07-21 17:00:09,381 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:00:09,382 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:00:09,407 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-07-21 17:00:09,604 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:09,604 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:00:09,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:00:09,605 INFO L85 PathProgramCache]: Analyzing trace with hash -790148272, now seen corresponding path program 15 times [2022-07-21 17:00:09,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:00:09,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054776886] [2022-07-21 17:00:09,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:00:09,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:00:09,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:00:10,467 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:10,467 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:00:10,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054776886] [2022-07-21 17:00:10,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054776886] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:00:10,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [996628376] [2022-07-21 17:00:10,467 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 17:00:10,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:10,468 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:00:10,469 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:00:10,470 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-07-21 17:00:10,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-07-21 17:00:10,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:00:10,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 120 conjunts are in the unsatisfiable core [2022-07-21 17:00:10,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:00:11,081 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 17:00:11,335 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 17:00:11,337 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:11,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:00:11,519 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:00:11,520 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:00:11,781 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:11,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [996628376] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:00:11,782 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:00:11,782 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 60 [2022-07-21 17:00:11,782 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973232581] [2022-07-21 17:00:11,782 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:00:11,782 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-07-21 17:00:11,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:00:11,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-07-21 17:00:11,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=3384, Unknown=0, NotChecked=0, Total=3540 [2022-07-21 17:00:11,784 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 60 states, 57 states have (on average 2.3859649122807016) internal successors, (136), 47 states have internal predecessors, (136), 16 states have call successors, (16), 14 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:13,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:00:13,465 INFO L93 Difference]: Finished difference Result 146 states and 147 transitions. [2022-07-21 17:00:13,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-07-21 17:00:13,465 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 57 states have (on average 2.3859649122807016) internal successors, (136), 47 states have internal predecessors, (136), 16 states have call successors, (16), 14 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2022-07-21 17:00:13,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:00:13,466 INFO L225 Difference]: With dead ends: 146 [2022-07-21 17:00:13,466 INFO L226 Difference]: Without dead ends: 101 [2022-07-21 17:00:13,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 160 SyntacticMatches, 5 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=285, Invalid=6687, Unknown=0, NotChecked=0, Total=6972 [2022-07-21 17:00:13,467 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 73 mSDsluCounter, 996 mSDsCounter, 0 mSdLazyCounter, 2838 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 1032 SdHoareTripleChecker+Invalid, 2914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 2838 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-07-21 17:00:13,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 1032 Invalid, 2914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 2838 Invalid, 0 Unknown, 63 Unchecked, 0.9s Time] [2022-07-21 17:00:13,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-07-21 17:00:13,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 98. [2022-07-21 17:00:13,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 states have internal predecessors, (87), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:13,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2022-07-21 17:00:13,470 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 93 [2022-07-21 17:00:13,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:00:13,470 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2022-07-21 17:00:13,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 57 states have (on average 2.3859649122807016) internal successors, (136), 47 states have internal predecessors, (136), 16 states have call successors, (16), 14 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:13,470 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2022-07-21 17:00:13,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-07-21 17:00:13,471 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:00:13,471 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:00:13,493 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-07-21 17:00:13,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-07-21 17:00:13,686 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:00:13,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:00:13,686 INFO L85 PathProgramCache]: Analyzing trace with hash 156309165, now seen corresponding path program 16 times [2022-07-21 17:00:13,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:00:13,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84899054] [2022-07-21 17:00:13,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:00:13,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:00:13,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:00:14,487 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 153 proven. 320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:14,487 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:00:14,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84899054] [2022-07-21 17:00:14,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [84899054] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:00:14,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102056909] [2022-07-21 17:00:14,487 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-21 17:00:14,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:14,488 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:00:14,489 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:00:14,490 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-07-21 17:00:14,585 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-21 17:00:14,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:00:14,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 124 conjunts are in the unsatisfiable core [2022-07-21 17:00:14,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:00:14,596 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 17:00:15,207 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-07-21 17:00:16,679 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:00:16,680 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-07-21 17:00:16,957 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 200 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:16,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:00:19,217 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:00:19,219 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:00:21,015 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 231 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:21,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102056909] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:00:21,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:00:21,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 41, 41] total 117 [2022-07-21 17:00:21,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10652789] [2022-07-21 17:00:21,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:00:21,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-07-21 17:00:21,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:00:21,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-07-21 17:00:21,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=906, Invalid=12900, Unknown=0, NotChecked=0, Total=13806 [2022-07-21 17:00:21,018 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 118 states, 113 states have (on average 2.2035398230088497) internal successors, (249), 82 states have internal predecessors, (249), 36 states have call successors, (36), 36 states have call predecessors, (36), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:24,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:00:24,619 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2022-07-21 17:00:24,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-07-21 17:00:24,620 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 113 states have (on average 2.2035398230088497) internal successors, (249), 82 states have internal predecessors, (249), 36 states have call successors, (36), 36 states have call predecessors, (36), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2022-07-21 17:00:24,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:00:24,621 INFO L225 Difference]: With dead ends: 108 [2022-07-21 17:00:24,621 INFO L226 Difference]: Without dead ends: 108 [2022-07-21 17:00:24,622 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3666 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=1528, Invalid=20822, Unknown=0, NotChecked=0, Total=22350 [2022-07-21 17:00:24,623 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 254 mSDsluCounter, 1137 mSDsCounter, 0 mSdLazyCounter, 3408 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 1177 SdHoareTripleChecker+Invalid, 3569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 3408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 120 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-07-21 17:00:24,623 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 1177 Invalid, 3569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 3408 Invalid, 0 Unknown, 120 Unchecked, 1.4s Time] [2022-07-21 17:00:24,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-07-21 17:00:24,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2022-07-21 17:00:24,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 14 states have call successors, (14), 14 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:24,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2022-07-21 17:00:24,625 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 97 [2022-07-21 17:00:24,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:00:24,626 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2022-07-21 17:00:24,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 113 states have (on average 2.2035398230088497) internal successors, (249), 82 states have internal predecessors, (249), 36 states have call successors, (36), 36 states have call predecessors, (36), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:24,626 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2022-07-21 17:00:24,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-07-21 17:00:24,627 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:00:24,627 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:00:24,644 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-07-21 17:00:24,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-07-21 17:00:24,827 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:00:24,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:00:24,828 INFO L85 PathProgramCache]: Analyzing trace with hash -436125445, now seen corresponding path program 17 times [2022-07-21 17:00:24,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:00:24,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1925861578] [2022-07-21 17:00:24,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:00:24,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:00:24,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:00:25,513 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 292 proven. 277 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:25,514 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:00:25,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1925861578] [2022-07-21 17:00:25,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1925861578] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:00:25,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62754040] [2022-07-21 17:00:25,515 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-21 17:00:25,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:25,515 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:00:25,516 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:00:25,517 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-07-21 17:00:25,644 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2022-07-21 17:00:25,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:00:25,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 98 conjunts are in the unsatisfiable core [2022-07-21 17:00:25,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:00:25,657 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 17:00:27,239 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:27,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:00:28,107 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:28,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62754040] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:00:28,108 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:00:28,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 96 [2022-07-21 17:00:28,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425608206] [2022-07-21 17:00:28,108 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:00:28,108 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-07-21 17:00:28,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:00:28,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-07-21 17:00:28,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1173, Invalid=7947, Unknown=0, NotChecked=0, Total=9120 [2022-07-21 17:00:28,110 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 96 states, 95 states have (on average 2.3789473684210525) internal successors, (226), 69 states have internal predecessors, (226), 29 states have call successors, (29), 28 states have call predecessors, (29), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:28,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:00:28,785 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2022-07-21 17:00:28,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-07-21 17:00:28,785 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 2.3789473684210525) internal successors, (226), 69 states have internal predecessors, (226), 29 states have call successors, (29), 28 states have call predecessors, (29), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 105 [2022-07-21 17:00:28,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:00:28,786 INFO L225 Difference]: With dead ends: 165 [2022-07-21 17:00:28,786 INFO L226 Difference]: Without dead ends: 113 [2022-07-21 17:00:28,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3696 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1651, Invalid=10339, Unknown=0, NotChecked=0, Total=11990 [2022-07-21 17:00:28,787 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 102 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 931 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 944 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 931 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-21 17:00:28,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 323 Invalid, 944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 931 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-07-21 17:00:28,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-07-21 17:00:28,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 110. [2022-07-21 17:00:28,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 14 states have call successors, (14), 14 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:28,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2022-07-21 17:00:28,791 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 105 [2022-07-21 17:00:28,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:00:28,791 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2022-07-21 17:00:28,791 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 95 states have (on average 2.3789473684210525) internal successors, (226), 69 states have internal predecessors, (226), 29 states have call successors, (29), 28 states have call predecessors, (29), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:28,792 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2022-07-21 17:00:28,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-07-21 17:00:28,792 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:00:28,793 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:00:28,821 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-07-21 17:00:29,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-07-21 17:00:29,016 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:00:29,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:00:29,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1420552408, now seen corresponding path program 18 times [2022-07-21 17:00:29,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:00:29,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141320744] [2022-07-21 17:00:29,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:00:29,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:00:29,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:00:29,941 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:29,941 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:00:29,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141320744] [2022-07-21 17:00:29,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141320744] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:00:29,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119836667] [2022-07-21 17:00:29,941 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-21 17:00:29,942 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:29,942 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:00:29,943 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:00:29,944 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-07-21 17:00:30,175 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2022-07-21 17:00:30,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:00:30,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 140 conjunts are in the unsatisfiable core [2022-07-21 17:00:30,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:00:30,744 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 17:00:31,027 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 17:00:31,030 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:31,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:00:31,212 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:00:31,216 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:00:31,675 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:31,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119836667] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:00:31,675 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:00:31,676 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 68 [2022-07-21 17:00:31,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228281421] [2022-07-21 17:00:31,676 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:00:31,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-07-21 17:00:31,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:00:31,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-07-21 17:00:31,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=4382, Unknown=0, NotChecked=0, Total=4556 [2022-07-21 17:00:31,677 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand has 68 states, 65 states have (on average 2.4307692307692306) internal successors, (158), 53 states have internal predecessors, (158), 18 states have call successors, (18), 16 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:33,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:00:33,924 INFO L93 Difference]: Finished difference Result 170 states and 171 transitions. [2022-07-21 17:00:33,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-07-21 17:00:33,924 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 65 states have (on average 2.4307692307692306) internal successors, (158), 53 states have internal predecessors, (158), 18 states have call successors, (18), 16 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2022-07-21 17:00:33,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:00:33,927 INFO L225 Difference]: With dead ends: 170 [2022-07-21 17:00:33,927 INFO L226 Difference]: Without dead ends: 117 [2022-07-21 17:00:33,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 185 SyntacticMatches, 10 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=321, Invalid=8799, Unknown=0, NotChecked=0, Total=9120 [2022-07-21 17:00:33,928 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 87 mSDsluCounter, 1420 mSDsCounter, 0 mSdLazyCounter, 4080 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 1462 SdHoareTripleChecker+Invalid, 4170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 4080 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 74 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-07-21 17:00:33,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 1462 Invalid, 4170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 4080 Invalid, 0 Unknown, 74 Unchecked, 1.3s Time] [2022-07-21 17:00:33,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-07-21 17:00:33,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 114. [2022-07-21 17:00:33,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 14 states have call successors, (14), 14 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:33,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2022-07-21 17:00:33,932 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 109 [2022-07-21 17:00:33,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:00:33,932 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2022-07-21 17:00:33,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 65 states have (on average 2.4307692307692306) internal successors, (158), 53 states have internal predecessors, (158), 18 states have call successors, (18), 16 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:33,933 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2022-07-21 17:00:33,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-07-21 17:00:33,933 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:00:33,940 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:00:33,960 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-07-21 17:00:34,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:34,152 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:00:34,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:00:34,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1680516555, now seen corresponding path program 19 times [2022-07-21 17:00:34,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:00:34,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449469759] [2022-07-21 17:00:34,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:00:34,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:00:34,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:00:35,153 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 231 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:35,153 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:00:35,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449469759] [2022-07-21 17:00:35,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449469759] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:00:35,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234098801] [2022-07-21 17:00:35,153 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-21 17:00:35,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:35,154 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:00:35,155 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:00:35,155 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-07-21 17:00:35,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:00:35,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 129 conjunts are in the unsatisfiable core [2022-07-21 17:00:35,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:00:35,965 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 276 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:35,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:00:37,321 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-21 17:00:37,420 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 276 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:37,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234098801] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:00:37,420 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:00:37,420 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 45] total 92 [2022-07-21 17:00:37,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091940806] [2022-07-21 17:00:37,421 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:00:37,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-07-21 17:00:37,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:00:37,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-07-21 17:00:37,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=659, Invalid=7897, Unknown=0, NotChecked=0, Total=8556 [2022-07-21 17:00:37,424 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand has 93 states, 89 states have (on average 2.235955056179775) internal successors, (199), 64 states have internal predecessors, (199), 30 states have call successors, (30), 29 states have call predecessors, (30), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:39,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:00:39,038 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2022-07-21 17:00:39,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-07-21 17:00:39,039 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 89 states have (on average 2.235955056179775) internal successors, (199), 64 states have internal predecessors, (199), 30 states have call successors, (30), 29 states have call predecessors, (30), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2022-07-21 17:00:39,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:00:39,040 INFO L225 Difference]: With dead ends: 120 [2022-07-21 17:00:39,040 INFO L226 Difference]: Without dead ends: 120 [2022-07-21 17:00:39,041 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3096 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=961, Invalid=10595, Unknown=0, NotChecked=0, Total=11556 [2022-07-21 17:00:39,042 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 211 mSDsluCounter, 1132 mSDsCounter, 0 mSdLazyCounter, 3397 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1179 SdHoareTripleChecker+Invalid, 3420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 3397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:00:39,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 1179 Invalid, 3420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 3397 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-07-21 17:00:39,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-07-21 17:00:39,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2022-07-21 17:00:39,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 states have internal predecessors, (104), 15 states have call successors, (15), 15 states have call predecessors, (15), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:39,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2022-07-21 17:00:39,045 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 113 [2022-07-21 17:00:39,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:00:39,046 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2022-07-21 17:00:39,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 89 states have (on average 2.235955056179775) internal successors, (199), 64 states have internal predecessors, (199), 30 states have call successors, (30), 29 states have call predecessors, (30), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:39,046 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2022-07-21 17:00:39,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-07-21 17:00:39,047 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:00:39,047 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:00:39,064 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-07-21 17:00:39,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-07-21 17:00:39,251 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:00:39,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:00:39,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1602531044, now seen corresponding path program 20 times [2022-07-21 17:00:39,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:00:39,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274121055] [2022-07-21 17:00:39,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:00:39,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:00:39,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:00:40,388 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 41 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:40,389 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:00:40,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274121055] [2022-07-21 17:00:40,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1274121055] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:00:40,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639683708] [2022-07-21 17:00:40,389 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 17:00:40,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:40,390 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:00:40,390 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:00:40,391 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-07-21 17:00:40,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 17:00:40,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:00:40,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 144 conjunts are in the unsatisfiable core [2022-07-21 17:00:40,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:00:41,118 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 17:00:43,857 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:00:43,857 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2022-07-21 17:00:44,188 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 276 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:44,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:00:47,632 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:00:47,636 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:00:47,639 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 27 [2022-07-21 17:00:47,727 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 276 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:47,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639683708] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:00:47,727 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:00:47,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 49, 49] total 130 [2022-07-21 17:00:47,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355492586] [2022-07-21 17:00:47,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:00:47,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2022-07-21 17:00:47,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:00:47,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2022-07-21 17:00:47,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=727, Invalid=16043, Unknown=0, NotChecked=0, Total=16770 [2022-07-21 17:00:47,730 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand has 130 states, 125 states have (on average 1.968) internal successors, (246), 86 states have internal predecessors, (246), 45 states have call successors, (45), 45 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:53,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:00:53,630 INFO L93 Difference]: Finished difference Result 188 states and 189 transitions. [2022-07-21 17:00:53,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-07-21 17:00:53,631 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 125 states have (on average 1.968) internal successors, (246), 86 states have internal predecessors, (246), 45 states have call successors, (45), 45 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2022-07-21 17:00:53,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:00:53,631 INFO L225 Difference]: With dead ends: 188 [2022-07-21 17:00:53,631 INFO L226 Difference]: Without dead ends: 131 [2022-07-21 17:00:53,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 175 SyntacticMatches, 3 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3751 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=1230, Invalid=25830, Unknown=0, NotChecked=0, Total=27060 [2022-07-21 17:00:53,633 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 108 mSDsluCounter, 2124 mSDsCounter, 0 mSdLazyCounter, 2651 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 2172 SdHoareTripleChecker+Invalid, 4394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 2651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1724 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-07-21 17:00:53,634 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 2172 Invalid, 4394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 2651 Invalid, 0 Unknown, 1724 Unchecked, 0.9s Time] [2022-07-21 17:00:53,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-07-21 17:00:53,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 126. [2022-07-21 17:00:53,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 109 states have (on average 1.018348623853211) internal successors, (111), 109 states have internal predecessors, (111), 16 states have call successors, (16), 16 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:53,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2022-07-21 17:00:53,637 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 117 [2022-07-21 17:00:53,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:00:53,638 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2022-07-21 17:00:53,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 125 states have (on average 1.968) internal successors, (246), 86 states have internal predecessors, (246), 45 states have call successors, (45), 45 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:00:53,638 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2022-07-21 17:00:53,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-07-21 17:00:53,639 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:00:53,639 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:00:53,660 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-07-21 17:00:53,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:53,851 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:00:53,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:00:53,852 INFO L85 PathProgramCache]: Analyzing trace with hash -1357985184, now seen corresponding path program 21 times [2022-07-21 17:00:53,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:00:53,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507753756] [2022-07-21 17:00:53,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:00:53,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:00:53,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:00:55,205 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 44 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:55,206 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:00:55,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507753756] [2022-07-21 17:00:55,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507753756] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:00:55,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804277443] [2022-07-21 17:00:55,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 17:00:55,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:00:55,206 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:00:55,207 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:00:55,208 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-07-21 17:00:55,611 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-07-21 17:00:55,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:00:55,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 160 conjunts are in the unsatisfiable core [2022-07-21 17:00:55,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:00:56,382 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 17:00:56,692 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 17:00:56,701 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 44 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:56,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:00:56,911 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:00:56,912 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:00:57,426 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 44 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:00:57,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804277443] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:00:57,426 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:00:57,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2022-07-21 17:00:57,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672832958] [2022-07-21 17:00:57,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:00:57,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-07-21 17:00:57,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:00:57,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-07-21 17:00:57,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=5508, Unknown=0, NotChecked=0, Total=5700 [2022-07-21 17:00:57,428 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand has 76 states, 73 states have (on average 2.4657534246575343) internal successors, (180), 59 states have internal predecessors, (180), 20 states have call successors, (20), 18 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:00,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:01:00,318 INFO L93 Difference]: Finished difference Result 194 states and 195 transitions. [2022-07-21 17:01:00,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-07-21 17:01:00,318 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 73 states have (on average 2.4657534246575343) internal successors, (180), 59 states have internal predecessors, (180), 20 states have call successors, (20), 18 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 125 [2022-07-21 17:01:00,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:01:00,319 INFO L225 Difference]: With dead ends: 194 [2022-07-21 17:01:00,319 INFO L226 Difference]: Without dead ends: 133 [2022-07-21 17:01:00,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 215 SyntacticMatches, 10 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=357, Invalid=11199, Unknown=0, NotChecked=0, Total=11556 [2022-07-21 17:01:00,320 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 95 mSDsluCounter, 1753 mSDsCounter, 0 mSdLazyCounter, 5067 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 1801 SdHoareTripleChecker+Invalid, 5179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 5067 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 95 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-07-21 17:01:00,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 1801 Invalid, 5179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 5067 Invalid, 0 Unknown, 95 Unchecked, 1.7s Time] [2022-07-21 17:01:00,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-07-21 17:01:00,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 130. [2022-07-21 17:01:00,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 113 states have (on average 1.0176991150442478) internal successors, (115), 113 states have internal predecessors, (115), 16 states have call successors, (16), 16 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:00,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2022-07-21 17:01:00,323 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 125 [2022-07-21 17:01:00,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:01:00,324 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2022-07-21 17:01:00,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 73 states have (on average 2.4657534246575343) internal successors, (180), 59 states have internal predecessors, (180), 20 states have call successors, (20), 18 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:00,324 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2022-07-21 17:01:00,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-07-21 17:01:00,324 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:01:00,325 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:01:00,343 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-07-21 17:01:00,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:01:00,525 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:01:00,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:01:00,526 INFO L85 PathProgramCache]: Analyzing trace with hash -856956483, now seen corresponding path program 22 times [2022-07-21 17:01:00,526 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:01:00,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426255037] [2022-07-21 17:01:00,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:01:00,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:01:00,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:01:01,722 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 325 proven. 560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:01,722 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:01:01,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426255037] [2022-07-21 17:01:01,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426255037] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:01:01,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569444000] [2022-07-21 17:01:01,723 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-21 17:01:01,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:01:01,723 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:01:01,724 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:01:01,725 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-07-21 17:01:01,851 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-21 17:01:01,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:01:01,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 160 conjunts are in the unsatisfiable core [2022-07-21 17:01:01,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:01:01,867 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 17:01:02,868 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-07-21 17:01:05,276 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:01:05,276 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-07-21 17:01:05,624 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 392 proven. 493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:05,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:01:09,251 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:01:09,254 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:01:12,072 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 435 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:12,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569444000] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:01:12,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:01:12,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 53, 53] total 153 [2022-07-21 17:01:12,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669264600] [2022-07-21 17:01:12,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:01:12,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2022-07-21 17:01:12,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:01:12,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2022-07-21 17:01:12,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1484, Invalid=22078, Unknown=0, NotChecked=0, Total=23562 [2022-07-21 17:01:12,075 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 154 states, 149 states have (on average 2.2348993288590604) internal successors, (333), 106 states have internal predecessors, (333), 48 states have call successors, (48), 48 states have call predecessors, (48), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:17,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:01:17,651 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2022-07-21 17:01:17,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-07-21 17:01:17,652 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 149 states have (on average 2.2348993288590604) internal successors, (333), 106 states have internal predecessors, (333), 48 states have call successors, (48), 48 states have call predecessors, (48), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 129 [2022-07-21 17:01:17,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:01:17,652 INFO L225 Difference]: With dead ends: 140 [2022-07-21 17:01:17,652 INFO L226 Difference]: Without dead ends: 140 [2022-07-21 17:01:17,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6358 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=2392, Invalid=35050, Unknown=0, NotChecked=0, Total=37442 [2022-07-21 17:01:17,655 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 368 mSDsluCounter, 1836 mSDsCounter, 0 mSdLazyCounter, 5475 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 1888 SdHoareTripleChecker+Invalid, 5665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 5475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 141 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:01:17,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [368 Valid, 1888 Invalid, 5665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 5475 Invalid, 0 Unknown, 141 Unchecked, 2.1s Time] [2022-07-21 17:01:17,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-07-21 17:01:17,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 138. [2022-07-21 17:01:17,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 18 states have call successors, (18), 18 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:17,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2022-07-21 17:01:17,658 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 129 [2022-07-21 17:01:17,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:01:17,659 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2022-07-21 17:01:17,659 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 149 states have (on average 2.2348993288590604) internal successors, (333), 106 states have internal predecessors, (333), 48 states have call successors, (48), 48 states have call predecessors, (48), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:17,659 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2022-07-21 17:01:17,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-07-21 17:01:17,660 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:01:17,660 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:01:17,679 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-07-21 17:01:17,867 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:01:17,867 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:01:17,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:01:17,868 INFO L85 PathProgramCache]: Analyzing trace with hash -135791605, now seen corresponding path program 23 times [2022-07-21 17:01:17,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:01:17,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475501007] [2022-07-21 17:01:17,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:01:17,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:01:17,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:01:18,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 516 proven. 497 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:18,890 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:01:18,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475501007] [2022-07-21 17:01:18,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475501007] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:01:18,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829185414] [2022-07-21 17:01:18,891 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-21 17:01:18,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:01:18,891 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:01:18,892 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:01:18,893 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-07-21 17:01:19,098 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2022-07-21 17:01:19,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:01:19,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 126 conjunts are in the unsatisfiable core [2022-07-21 17:01:19,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:01:19,110 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 17:01:21,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 578 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:21,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:01:22,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 578 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:22,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829185414] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:01:22,950 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:01:22,950 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 124 [2022-07-21 17:01:22,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160782031] [2022-07-21 17:01:22,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:01:22,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-07-21 17:01:22,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:01:22,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-07-21 17:01:22,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1937, Invalid=13315, Unknown=0, NotChecked=0, Total=15252 [2022-07-21 17:01:22,952 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand has 124 states, 123 states have (on average 2.4227642276422765) internal successors, (298), 89 states have internal predecessors, (298), 37 states have call successors, (37), 36 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:23,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:01:23,758 INFO L93 Difference]: Finished difference Result 213 states and 214 transitions. [2022-07-21 17:01:23,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-07-21 17:01:23,759 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 123 states have (on average 2.4227642276422765) internal successors, (298), 89 states have internal predecessors, (298), 37 states have call successors, (37), 36 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2022-07-21 17:01:23,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:01:23,760 INFO L225 Difference]: With dead ends: 213 [2022-07-21 17:01:23,760 INFO L226 Difference]: Without dead ends: 145 [2022-07-21 17:01:23,761 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 203 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6336 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=2729, Invalid=17293, Unknown=0, NotChecked=0, Total=20022 [2022-07-21 17:01:23,761 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 228 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 806 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 17:01:23,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 289 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 806 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-21 17:01:23,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2022-07-21 17:01:23,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 142. [2022-07-21 17:01:23,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 18 states have call successors, (18), 18 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:23,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2022-07-21 17:01:23,765 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 137 [2022-07-21 17:01:23,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:01:23,765 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2022-07-21 17:01:23,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 123 states have (on average 2.4227642276422765) internal successors, (298), 89 states have internal predecessors, (298), 37 states have call successors, (37), 36 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:23,765 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2022-07-21 17:01:23,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-07-21 17:01:23,766 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:01:23,766 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:01:23,786 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-07-21 17:01:23,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:01:23,975 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:01:23,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:01:23,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1653346328, now seen corresponding path program 24 times [2022-07-21 17:01:23,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:01:23,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606939786] [2022-07-21 17:01:23,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:01:23,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:01:24,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:01:25,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 50 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:25,456 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:01:25,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606939786] [2022-07-21 17:01:25,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606939786] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:01:25,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564272889] [2022-07-21 17:01:25,457 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-21 17:01:25,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:01:25,457 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:01:25,460 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:01:25,476 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-07-21 17:01:26,054 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2022-07-21 17:01:26,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:01:26,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 178 conjunts are in the unsatisfiable core [2022-07-21 17:01:26,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:01:26,952 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 17:01:27,305 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 17:01:27,308 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 50 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:27,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:01:27,540 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:01:27,544 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:01:28,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 50 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:28,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564272889] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:01:28,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:01:28,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 84 [2022-07-21 17:01:28,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487940655] [2022-07-21 17:01:28,246 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:01:28,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-07-21 17:01:28,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:01:28,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-07-21 17:01:28,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=6762, Unknown=0, NotChecked=0, Total=6972 [2022-07-21 17:01:28,248 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 84 states, 81 states have (on average 2.493827160493827) internal successors, (202), 65 states have internal predecessors, (202), 22 states have call successors, (22), 20 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:31,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:01:31,912 INFO L93 Difference]: Finished difference Result 218 states and 219 transitions. [2022-07-21 17:01:31,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-07-21 17:01:31,912 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 81 states have (on average 2.493827160493827) internal successors, (202), 65 states have internal predecessors, (202), 22 states have call successors, (22), 20 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 141 [2022-07-21 17:01:31,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:01:31,913 INFO L225 Difference]: With dead ends: 218 [2022-07-21 17:01:31,913 INFO L226 Difference]: Without dead ends: 149 [2022-07-21 17:01:31,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 242 SyntacticMatches, 13 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1535 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=393, Invalid=13887, Unknown=0, NotChecked=0, Total=14280 [2022-07-21 17:01:31,914 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 104 mSDsluCounter, 2288 mSDsCounter, 0 mSdLazyCounter, 6658 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 2342 SdHoareTripleChecker+Invalid, 6755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 6658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 78 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:01:31,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 2342 Invalid, 6755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 6658 Invalid, 0 Unknown, 78 Unchecked, 2.2s Time] [2022-07-21 17:01:31,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-07-21 17:01:31,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 146. [2022-07-21 17:01:31,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 18 states have call successors, (18), 18 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:31,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2022-07-21 17:01:31,917 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 141 [2022-07-21 17:01:31,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:01:31,917 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2022-07-21 17:01:31,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 81 states have (on average 2.493827160493827) internal successors, (202), 65 states have internal predecessors, (202), 22 states have call successors, (22), 20 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:31,918 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2022-07-21 17:01:31,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-07-21 17:01:31,918 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:01:31,919 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:01:31,939 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-07-21 17:01:32,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-07-21 17:01:32,124 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:01:32,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:01:32,124 INFO L85 PathProgramCache]: Analyzing trace with hash -235360955, now seen corresponding path program 25 times [2022-07-21 17:01:32,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:01:32,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154830176] [2022-07-21 17:01:32,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:01:32,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:01:32,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:01:33,513 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 435 proven. 704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:33,514 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:01:33,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154830176] [2022-07-21 17:01:33,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154830176] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:01:33,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604976674] [2022-07-21 17:01:33,514 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-21 17:01:33,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:01:33,514 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:01:33,515 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:01:33,516 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-07-21 17:01:33,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:01:33,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 165 conjunts are in the unsatisfiable core [2022-07-21 17:01:33,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:01:34,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 496 proven. 643 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:34,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:01:36,850 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-21 17:01:36,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 496 proven. 643 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:36,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604976674] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:01:36,952 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:01:36,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 57, 57] total 116 [2022-07-21 17:01:36,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182572924] [2022-07-21 17:01:36,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:01:36,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2022-07-21 17:01:36,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:01:36,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2022-07-21 17:01:36,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=12555, Unknown=0, NotChecked=0, Total=13572 [2022-07-21 17:01:36,955 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand has 117 states, 113 states have (on average 2.256637168141593) internal successors, (255), 80 states have internal predecessors, (255), 38 states have call successors, (38), 37 states have call predecessors, (38), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:39,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:01:39,598 INFO L93 Difference]: Finished difference Result 152 states and 153 transitions. [2022-07-21 17:01:39,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-07-21 17:01:39,598 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 113 states have (on average 2.256637168141593) internal successors, (255), 80 states have internal predecessors, (255), 38 states have call successors, (38), 37 states have call predecessors, (38), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2022-07-21 17:01:39,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:01:39,599 INFO L225 Difference]: With dead ends: 152 [2022-07-21 17:01:39,599 INFO L226 Difference]: Without dead ends: 152 [2022-07-21 17:01:39,600 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 227 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5030 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1475, Invalid=16885, Unknown=0, NotChecked=0, Total=18360 [2022-07-21 17:01:39,601 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 316 mSDsluCounter, 1849 mSDsCounter, 0 mSdLazyCounter, 5541 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 1908 SdHoareTripleChecker+Invalid, 5567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 5541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-07-21 17:01:39,601 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [316 Valid, 1908 Invalid, 5567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 5541 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-07-21 17:01:39,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-07-21 17:01:39,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2022-07-21 17:01:39,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 130 states have internal predecessors, (132), 19 states have call successors, (19), 19 states have call predecessors, (19), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:39,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2022-07-21 17:01:39,605 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 145 [2022-07-21 17:01:39,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:01:39,605 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2022-07-21 17:01:39,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 113 states have (on average 2.256637168141593) internal successors, (255), 80 states have internal predecessors, (255), 38 states have call successors, (38), 37 states have call predecessors, (38), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:01:39,606 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2022-07-21 17:01:39,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-07-21 17:01:39,607 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:01:39,607 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:01:39,627 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-07-21 17:01:39,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-07-21 17:01:39,815 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:01:39,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:01:39,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1080124372, now seen corresponding path program 26 times [2022-07-21 17:01:39,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:01:39,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300064031] [2022-07-21 17:01:39,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:01:39,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:01:39,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:01:41,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 53 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:41,410 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:01:41,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300064031] [2022-07-21 17:01:41,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300064031] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:01:41,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492255037] [2022-07-21 17:01:41,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 17:01:41,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:01:41,411 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:01:41,412 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:01:41,413 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-07-21 17:01:41,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 17:01:41,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:01:41,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 595 conjuncts, 180 conjunts are in the unsatisfiable core [2022-07-21 17:01:41,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:01:42,431 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 17:01:46,679 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:01:46,679 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2022-07-21 17:01:47,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 496 proven. 713 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:47,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:01:52,308 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:01:52,311 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-07-21 17:01:52,322 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:01:52,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 496 proven. 713 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:01:52,434 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492255037] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:01:52,434 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:01:52,434 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 61, 61] total 162 [2022-07-21 17:01:52,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073509893] [2022-07-21 17:01:52,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:01:52,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 162 states [2022-07-21 17:01:52,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:01:52,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2022-07-21 17:01:52,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1063, Invalid=25019, Unknown=0, NotChecked=0, Total=26082 [2022-07-21 17:01:52,442 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand has 162 states, 157 states have (on average 2.0) internal successors, (314), 106 states have internal predecessors, (314), 57 states have call successors, (57), 57 states have call predecessors, (57), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:00,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:02:00,174 INFO L93 Difference]: Finished difference Result 236 states and 237 transitions. [2022-07-21 17:02:00,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-07-21 17:02:00,174 INFO L78 Accepts]: Start accepts. Automaton has has 162 states, 157 states have (on average 2.0) internal successors, (314), 106 states have internal predecessors, (314), 57 states have call successors, (57), 57 states have call predecessors, (57), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 149 [2022-07-21 17:02:00,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:02:00,175 INFO L225 Difference]: With dead ends: 236 [2022-07-21 17:02:00,175 INFO L226 Difference]: Without dead ends: 163 [2022-07-21 17:02:00,178 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 227 SyntacticMatches, 3 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5909 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=1776, Invalid=40454, Unknown=0, NotChecked=0, Total=42230 [2022-07-21 17:02:00,178 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 146 mSDsluCounter, 3050 mSDsCounter, 0 mSdLazyCounter, 4459 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 3110 SdHoareTripleChecker+Invalid, 6584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 4459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2102 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-07-21 17:02:00,178 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 3110 Invalid, 6584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 4459 Invalid, 0 Unknown, 2102 Unchecked, 1.6s Time] [2022-07-21 17:02:00,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-07-21 17:02:00,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 158. [2022-07-21 17:02:00,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 137 states have (on average 1.0145985401459854) internal successors, (139), 137 states have internal predecessors, (139), 20 states have call successors, (20), 20 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:00,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2022-07-21 17:02:00,181 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 149 [2022-07-21 17:02:00,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:02:00,181 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2022-07-21 17:02:00,181 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 162 states, 157 states have (on average 2.0) internal successors, (314), 106 states have internal predecessors, (314), 57 states have call successors, (57), 57 states have call predecessors, (57), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:00,181 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2022-07-21 17:02:00,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-07-21 17:02:00,182 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:02:00,182 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:02:00,199 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-07-21 17:02:00,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-07-21 17:02:00,382 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:02:00,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:02:00,383 INFO L85 PathProgramCache]: Analyzing trace with hash 1765759344, now seen corresponding path program 27 times [2022-07-21 17:02:00,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:02:00,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690910414] [2022-07-21 17:02:00,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:02:00,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:02:00,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:02:02,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 56 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:02,170 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:02:02,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690910414] [2022-07-21 17:02:02,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690910414] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:02:02,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990231588] [2022-07-21 17:02:02,170 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 17:02:02,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:02:02,171 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:02:02,172 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:02:02,185 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-07-21 17:02:02,889 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-07-21 17:02:02,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:02:02,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 200 conjunts are in the unsatisfiable core [2022-07-21 17:02:02,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:02:03,984 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 17:02:04,374 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 17:02:04,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 56 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:04,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:02:04,638 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:02:04,640 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:02:05,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 56 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:05,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990231588] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:02:05,424 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:02:05,424 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 92 [2022-07-21 17:02:05,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245499772] [2022-07-21 17:02:05,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:02:05,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-07-21 17:02:05,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:02:05,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-07-21 17:02:05,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=8144, Unknown=0, NotChecked=0, Total=8372 [2022-07-21 17:02:05,427 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand has 92 states, 89 states have (on average 2.5168539325842696) internal successors, (224), 71 states have internal predecessors, (224), 24 states have call successors, (24), 22 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:09,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:02:09,793 INFO L93 Difference]: Finished difference Result 242 states and 243 transitions. [2022-07-21 17:02:09,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-07-21 17:02:09,794 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 89 states have (on average 2.5168539325842696) internal successors, (224), 71 states have internal predecessors, (224), 24 states have call successors, (24), 22 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 157 [2022-07-21 17:02:09,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:02:09,794 INFO L225 Difference]: With dead ends: 242 [2022-07-21 17:02:09,794 INFO L226 Difference]: Without dead ends: 165 [2022-07-21 17:02:09,795 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 272 SyntacticMatches, 13 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1790 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=429, Invalid=16863, Unknown=0, NotChecked=0, Total=17292 [2022-07-21 17:02:09,796 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 110 mSDsluCounter, 2728 mSDsCounter, 0 mSdLazyCounter, 7974 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 2788 SdHoareTripleChecker+Invalid, 8082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 7974 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-07-21 17:02:09,796 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 2788 Invalid, 8082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 7974 Invalid, 0 Unknown, 88 Unchecked, 2.6s Time] [2022-07-21 17:02:09,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2022-07-21 17:02:09,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 162. [2022-07-21 17:02:09,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 141 states have (on average 1.0141843971631206) internal successors, (143), 141 states have internal predecessors, (143), 20 states have call successors, (20), 20 states have call predecessors, (20), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:09,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2022-07-21 17:02:09,801 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 157 [2022-07-21 17:02:09,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:02:09,802 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2022-07-21 17:02:09,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 89 states have (on average 2.5168539325842696) internal successors, (224), 71 states have internal predecessors, (224), 24 states have call successors, (24), 22 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:09,802 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2022-07-21 17:02:09,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-07-21 17:02:09,804 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:02:09,804 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:02:09,833 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-07-21 17:02:10,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:02:10,023 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:02:10,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:02:10,024 INFO L85 PathProgramCache]: Analyzing trace with hash -329270067, now seen corresponding path program 28 times [2022-07-21 17:02:10,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:02:10,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480600245] [2022-07-21 17:02:10,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:02:10,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:02:10,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:02:11,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 561 proven. 864 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:11,671 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:02:11,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480600245] [2022-07-21 17:02:11,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480600245] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:02:11,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954036299] [2022-07-21 17:02:11,671 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-21 17:02:11,672 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:02:11,672 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:02:11,673 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:02:11,674 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-07-21 17:02:11,820 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-21 17:02:11,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:02:11,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 196 conjunts are in the unsatisfiable core [2022-07-21 17:02:11,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:02:11,833 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 17:02:13,255 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-07-21 17:02:16,855 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:02:16,856 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-07-21 17:02:17,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 648 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:17,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:02:22,589 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:02:22,592 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:02:26,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 703 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:26,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954036299] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:02:26,666 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:02:26,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 65, 65] total 189 [2022-07-21 17:02:26,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152686993] [2022-07-21 17:02:26,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:02:26,667 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2022-07-21 17:02:26,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:02:26,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2022-07-21 17:02:26,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2206, Invalid=33704, Unknown=0, NotChecked=0, Total=35910 [2022-07-21 17:02:26,670 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand has 190 states, 185 states have (on average 2.254054054054054) internal successors, (417), 130 states have internal predecessors, (417), 60 states have call successors, (60), 60 states have call predecessors, (60), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:35,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:02:35,129 INFO L93 Difference]: Finished difference Result 172 states and 173 transitions. [2022-07-21 17:02:35,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-07-21 17:02:35,130 INFO L78 Accepts]: Start accepts. Automaton has has 190 states, 185 states have (on average 2.254054054054054) internal successors, (417), 130 states have internal predecessors, (417), 60 states have call successors, (60), 60 states have call predecessors, (60), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 161 [2022-07-21 17:02:35,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:02:35,131 INFO L225 Difference]: With dead ends: 172 [2022-07-21 17:02:35,131 INFO L226 Difference]: Without dead ends: 172 [2022-07-21 17:02:35,134 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9786 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=3448, Invalid=52958, Unknown=0, NotChecked=0, Total=56406 [2022-07-21 17:02:35,134 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 682 mSDsluCounter, 2878 mSDsCounter, 0 mSdLazyCounter, 8550 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 682 SdHoareTripleChecker+Valid, 2942 SdHoareTripleChecker+Invalid, 8800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 8550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 199 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-07-21 17:02:35,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [682 Valid, 2942 Invalid, 8800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 8550 Invalid, 0 Unknown, 199 Unchecked, 3.4s Time] [2022-07-21 17:02:35,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-07-21 17:02:35,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 170. [2022-07-21 17:02:35,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 147 states have (on average 1.0136054421768708) internal successors, (149), 147 states have internal predecessors, (149), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:35,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2022-07-21 17:02:35,138 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 161 [2022-07-21 17:02:35,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:02:35,138 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2022-07-21 17:02:35,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 190 states, 185 states have (on average 2.254054054054054) internal successors, (417), 130 states have internal predecessors, (417), 60 states have call successors, (60), 60 states have call predecessors, (60), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:35,139 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2022-07-21 17:02:35,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2022-07-21 17:02:35,140 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:02:35,140 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:02:35,158 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-07-21 17:02:35,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-07-21 17:02:35,344 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:02:35,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:02:35,344 INFO L85 PathProgramCache]: Analyzing trace with hash -1013463269, now seen corresponding path program 29 times [2022-07-21 17:02:35,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:02:35,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27209339] [2022-07-21 17:02:35,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:02:35,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:02:35,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:02:36,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1585 backedges. 804 proven. 781 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:36,908 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:02:36,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27209339] [2022-07-21 17:02:36,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27209339] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:02:36,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310370118] [2022-07-21 17:02:36,908 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-21 17:02:36,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:02:36,908 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:02:36,909 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:02:36,910 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-07-21 17:02:37,276 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2022-07-21 17:02:37,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:02:37,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 154 conjunts are in the unsatisfiable core [2022-07-21 17:02:37,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:02:37,289 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 17:02:40,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1585 backedges. 882 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:40,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:02:42,850 INFO L134 CoverageAnalysis]: Checked inductivity of 1585 backedges. 882 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:42,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310370118] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:02:42,850 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:02:42,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65, 65] total 152 [2022-07-21 17:02:42,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730050755] [2022-07-21 17:02:42,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:02:42,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2022-07-21 17:02:42,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:02:42,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2022-07-21 17:02:42,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2893, Invalid=20059, Unknown=0, NotChecked=0, Total=22952 [2022-07-21 17:02:42,854 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand has 152 states, 151 states have (on average 2.4503311258278146) internal successors, (370), 109 states have internal predecessors, (370), 45 states have call successors, (45), 44 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:44,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:02:44,067 INFO L93 Difference]: Finished difference Result 261 states and 262 transitions. [2022-07-21 17:02:44,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-07-21 17:02:44,068 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 151 states have (on average 2.4503311258278146) internal successors, (370), 109 states have internal predecessors, (370), 45 states have call successors, (45), 44 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 169 [2022-07-21 17:02:44,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:02:44,069 INFO L225 Difference]: With dead ends: 261 [2022-07-21 17:02:44,069 INFO L226 Difference]: Without dead ends: 177 [2022-07-21 17:02:44,070 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 251 SyntacticMatches, 1 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9680 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=4079, Invalid=26023, Unknown=0, NotChecked=0, Total=30102 [2022-07-21 17:02:44,071 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 168 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 1209 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 1222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-21 17:02:44,071 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 434 Invalid, 1222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1209 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-07-21 17:02:44,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2022-07-21 17:02:44,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 174. [2022-07-21 17:02:44,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 151 states have (on average 1.0132450331125828) internal successors, (153), 151 states have internal predecessors, (153), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:44,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2022-07-21 17:02:44,074 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 169 [2022-07-21 17:02:44,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:02:44,075 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2022-07-21 17:02:44,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 151 states have (on average 2.4503311258278146) internal successors, (370), 109 states have internal predecessors, (370), 45 states have call successors, (45), 44 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:44,075 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2022-07-21 17:02:44,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-07-21 17:02:44,076 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:02:44,076 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:02:44,103 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-07-21 17:02:44,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-07-21 17:02:44,303 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:02:44,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:02:44,304 INFO L85 PathProgramCache]: Analyzing trace with hash -405469448, now seen corresponding path program 30 times [2022-07-21 17:02:44,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:02:44,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746971209] [2022-07-21 17:02:44,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:02:44,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:02:44,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:02:46,349 INFO L134 CoverageAnalysis]: Checked inductivity of 1662 backedges. 62 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:46,349 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:02:46,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746971209] [2022-07-21 17:02:46,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746971209] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:02:46,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622526240] [2022-07-21 17:02:46,350 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-21 17:02:46,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:02:46,350 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:02:46,351 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:02:46,352 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-07-21 17:02:47,238 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2022-07-21 17:02:47,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 17:02:47,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 220 conjunts are in the unsatisfiable core [2022-07-21 17:02:47,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:02:48,594 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-21 17:02:49,066 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-07-21 17:02:49,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1662 backedges. 62 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:49,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:02:49,379 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-07-21 17:02:49,381 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2022-07-21 17:02:50,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1662 backedges. 62 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:50,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622526240] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:02:50,233 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:02:50,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 100 [2022-07-21 17:02:50,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382370566] [2022-07-21 17:02:50,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:02:50,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-07-21 17:02:50,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:02:50,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-07-21 17:02:50,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=9654, Unknown=0, NotChecked=0, Total=9900 [2022-07-21 17:02:50,234 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand has 100 states, 97 states have (on average 2.536082474226804) internal successors, (246), 77 states have internal predecessors, (246), 26 states have call successors, (26), 24 states have call predecessors, (26), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:55,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:02:55,534 INFO L93 Difference]: Finished difference Result 266 states and 267 transitions. [2022-07-21 17:02:55,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-07-21 17:02:55,535 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 97 states have (on average 2.536082474226804) internal successors, (246), 77 states have internal predecessors, (246), 26 states have call successors, (26), 24 states have call predecessors, (26), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 173 [2022-07-21 17:02:55,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:02:55,535 INFO L225 Difference]: With dead ends: 266 [2022-07-21 17:02:55,536 INFO L226 Difference]: Without dead ends: 181 [2022-07-21 17:02:55,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 302 SyntacticMatches, 13 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2065 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=465, Invalid=20127, Unknown=0, NotChecked=0, Total=20592 [2022-07-21 17:02:55,537 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 134 mSDsluCounter, 3410 mSDsCounter, 0 mSdLazyCounter, 9939 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 3476 SdHoareTripleChecker+Invalid, 10085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 9939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 122 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:02:55,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 3476 Invalid, 10085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 9939 Invalid, 0 Unknown, 122 Unchecked, 3.2s Time] [2022-07-21 17:02:55,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-07-21 17:02:55,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 178. [2022-07-21 17:02:55,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 155 states have (on average 1.0129032258064516) internal successors, (157), 155 states have internal predecessors, (157), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:55,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2022-07-21 17:02:55,540 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 173 [2022-07-21 17:02:55,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:02:55,540 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2022-07-21 17:02:55,540 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 97 states have (on average 2.536082474226804) internal successors, (246), 77 states have internal predecessors, (246), 26 states have call successors, (26), 24 states have call predecessors, (26), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:02:55,541 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2022-07-21 17:02:55,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2022-07-21 17:02:55,541 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:02:55,542 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:02:55,563 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-07-21 17:02:55,751 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-07-21 17:02:55,751 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting strlen_recErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2022-07-21 17:02:55,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:02:55,752 INFO L85 PathProgramCache]: Analyzing trace with hash 696586325, now seen corresponding path program 31 times [2022-07-21 17:02:55,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:02:55,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975610143] [2022-07-21 17:02:55,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:02:55,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:02:55,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:02:57,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 703 proven. 1040 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:57,707 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:02:57,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975610143] [2022-07-21 17:02:57,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975610143] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:02:57,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154043850] [2022-07-21 17:02:57,707 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-07-21 17:02:57,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:02:57,708 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:02:57,709 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:02:57,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-07-21 17:02:57,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:02:57,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 201 conjunts are in the unsatisfiable core [2022-07-21 17:02:57,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:02:59,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 780 proven. 963 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:02:59,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:03:02,884 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-21 17:03:03,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 780 proven. 963 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:03:03,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154043850] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:03:03,042 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:03:03,042 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 69, 69] total 139 [2022-07-21 17:03:03,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469775179] [2022-07-21 17:03:03,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:03:03,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2022-07-21 17:03:03,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:03:03,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2022-07-21 17:03:03,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1219, Invalid=18241, Unknown=0, NotChecked=0, Total=19460 [2022-07-21 17:03:03,047 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand has 140 states, 137 states have (on average 2.27007299270073) internal successors, (311), 95 states have internal predecessors, (311), 46 states have call successors, (46), 45 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)