./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 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa --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-hotfix-svcomp22-839c364 [2021-12-07 00:01:12,564 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-07 00:01:12,566 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-07 00:01:12,589 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-07 00:01:12,590 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-07 00:01:12,591 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-07 00:01:12,592 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-07 00:01:12,594 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-07 00:01:12,595 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-07 00:01:12,596 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-07 00:01:12,597 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-07 00:01:12,598 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-07 00:01:12,598 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-07 00:01:12,599 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-07 00:01:12,601 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-07 00:01:12,602 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-07 00:01:12,603 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-07 00:01:12,604 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-07 00:01:12,605 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-07 00:01:12,607 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-07 00:01:12,609 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-07 00:01:12,610 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-07 00:01:12,611 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-07 00:01:12,612 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-07 00:01:12,614 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-07 00:01:12,615 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-07 00:01:12,615 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-07 00:01:12,616 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-07 00:01:12,616 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-07 00:01:12,617 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-07 00:01:12,617 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-07 00:01:12,618 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-07 00:01:12,619 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-07 00:01:12,619 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-07 00:01:12,620 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-07 00:01:12,620 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-07 00:01:12,621 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-07 00:01:12,621 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-07 00:01:12,621 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-07 00:01:12,622 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-07 00:01:12,622 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-07 00:01:12,623 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-07 00:01:12,647 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-07 00:01:12,647 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-07 00:01:12,648 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-07 00:01:12,648 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-07 00:01:12,648 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-07 00:01:12,649 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-07 00:01:12,649 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-07 00:01:12,649 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-07 00:01:12,650 INFO L138 SettingsManager]: * Use SBE=true [2021-12-07 00:01:12,650 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-07 00:01:12,650 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-07 00:01:12,650 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-07 00:01:12,650 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-07 00:01:12,650 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-07 00:01:12,651 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-07 00:01:12,651 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-07 00:01:12,651 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-07 00:01:12,651 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-07 00:01:12,651 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-07 00:01:12,651 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-07 00:01:12,651 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-07 00:01:12,652 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-07 00:01:12,652 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-07 00:01:12,652 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-07 00:01:12,652 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-07 00:01:12,652 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-07 00:01:12,652 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-07 00:01:12,652 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-07 00:01:12,653 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-07 00:01:12,653 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-07 00:01:12,653 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-07 00:01:12,653 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 60396cce4fa0936fb91e88a54a287214045469c9d9b3d447954681e0a5aabbc0 [2021-12-07 00:01:12,840 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-07 00:01:12,858 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-07 00:01:12,860 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-07 00:01:12,860 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-07 00:01:12,861 INFO L275 PluginConnector]: CDTParser initialized [2021-12-07 00:01:12,862 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2021-12-07 00:01:12,905 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/data/aaed0f56d/b99b682a800b4c84a801e01043873bb1/FLAG8afcb85c2 [2021-12-07 00:01:13,313 INFO L306 CDTParser]: Found 1 translation units. [2021-12-07 00:01:13,313 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2021-12-07 00:01:13,325 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/data/aaed0f56d/b99b682a800b4c84a801e01043873bb1/FLAG8afcb85c2 [2021-12-07 00:01:13,334 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/data/aaed0f56d/b99b682a800b4c84a801e01043873bb1 [2021-12-07 00:01:13,336 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-07 00:01:13,337 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-07 00:01:13,338 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-07 00:01:13,338 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-07 00:01:13,341 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-07 00:01:13,341 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,342 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@acf6097 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13, skipping insertion in model container [2021-12-07 00:01:13,342 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,347 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-07 00:01:13,377 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-07 00:01:13,567 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-07 00:01:13,573 INFO L203 MainTranslator]: Completed pre-run [2021-12-07 00:01:13,598 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-07 00:01:13,617 INFO L208 MainTranslator]: Completed translation [2021-12-07 00:01:13,618 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13 WrapperNode [2021-12-07 00:01:13,618 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-07 00:01:13,619 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-07 00:01:13,619 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-07 00:01:13,619 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-07 00:01:13,625 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,634 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,647 INFO L137 Inliner]: procedures = 117, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 29 [2021-12-07 00:01:13,648 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-07 00:01:13,648 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-07 00:01:13,648 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-07 00:01:13,648 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-07 00:01:13,654 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,656 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,656 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,660 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,663 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,665 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-07 00:01:13,666 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-07 00:01:13,666 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-07 00:01:13,666 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-07 00:01:13,667 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (1/1) ... [2021-12-07 00:01:13,672 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-07 00:01:13,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:13,691 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-07 00:01:13,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-07 00:01:13,729 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-07 00:01:13,729 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-07 00:01:13,729 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-07 00:01:13,730 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-07 00:01:13,730 INFO L130 BoogieDeclarations]: Found specification of procedure strlen_rec [2021-12-07 00:01:13,730 INFO L138 BoogieDeclarations]: Found implementation of procedure strlen_rec [2021-12-07 00:01:13,730 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-07 00:01:13,730 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-07 00:01:13,795 INFO L236 CfgBuilder]: Building ICFG [2021-12-07 00:01:13,796 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-07 00:01:13,899 INFO L277 CfgBuilder]: Performing block encoding [2021-12-07 00:01:13,904 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-07 00:01:13,904 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-07 00:01:13,905 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:01:13 BoogieIcfgContainer [2021-12-07 00:01:13,905 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-07 00:01:13,907 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-07 00:01:13,907 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-07 00:01:13,909 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-07 00:01:13,909 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 12:01:13" (1/3) ... [2021-12-07 00:01:13,910 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e00c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 12:01:13, skipping insertion in model container [2021-12-07 00:01:13,910 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:01:13" (2/3) ... [2021-12-07 00:01:13,910 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e00c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 12:01:13, skipping insertion in model container [2021-12-07 00:01:13,910 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:01:13" (3/3) ... [2021-12-07 00:01:13,911 INFO L111 eAbstractionObserver]: Analyzing ICFG rec_strlen-alloca-1.i [2021-12-07 00:01:13,917 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-07 00:01:13,917 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 7 error locations. [2021-12-07 00:01:13,957 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-07 00:01:13,963 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-07 00:01:13,963 INFO L340 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2021-12-07 00:01:13,974 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-07 00:01:13,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-07 00:01:13,979 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:13,979 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-07 00:01:13,980 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:13,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:13,984 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2021-12-07 00:01:13,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:13,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652063811] [2021-12-07 00:01:13,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:13,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:14,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:14,146 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:14,146 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:14,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652063811] [2021-12-07 00:01:14,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652063811] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:01:14,148 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:01:14,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-07 00:01:14,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348650608] [2021-12-07 00:01:14,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:01:14,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-07 00:01:14,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:14,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-07 00:01:14,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:01:14,179 INFO L87 Difference]: Start difference. First operand has 28 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:14,228 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-12-07 00:01:14,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-07 00:01:14,231 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-07 00:01:14,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:14,236 INFO L225 Difference]: With dead ends: 39 [2021-12-07 00:01:14,236 INFO L226 Difference]: Without dead ends: 35 [2021-12-07 00:01:14,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:01:14,240 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 9 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:14,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 71 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:14,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-12-07 00:01:14,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-12-07 00:01:14,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.5) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-07 00:01:14,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-12-07 00:01:14,271 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 6 [2021-12-07 00:01:14,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:14,271 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-12-07 00:01:14,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,272 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-12-07 00:01:14,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-07 00:01:14,272 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:14,272 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-07 00:01:14,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-07 00:01:14,273 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:14,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:14,274 INFO L85 PathProgramCache]: Analyzing trace with hash 889508820, now seen corresponding path program 1 times [2021-12-07 00:01:14,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:14,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30214027] [2021-12-07 00:01:14,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:14,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:14,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:14,310 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:14,311 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:14,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30214027] [2021-12-07 00:01:14,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30214027] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:01:14,311 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:01:14,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-07 00:01:14,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407239914] [2021-12-07 00:01:14,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:01:14,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-07 00:01:14,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:14,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-07 00:01:14,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-07 00:01:14,320 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:14,339 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2021-12-07 00:01:14,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-07 00:01:14,339 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-07 00:01:14,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:14,340 INFO L225 Difference]: With dead ends: 26 [2021-12-07 00:01:14,340 INFO L226 Difference]: Without dead ends: 26 [2021-12-07 00:01:14,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-07 00:01:14,342 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 7 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:14,343 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 32 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:14,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-12-07 00:01:14,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-12-07 00:01:14,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 22 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-07 00:01:14,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-12-07 00:01:14,348 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 6 [2021-12-07 00:01:14,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:14,348 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-12-07 00:01:14,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,348 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-12-07 00:01:14,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-07 00:01:14,349 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:14,349 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-07 00:01:14,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-07 00:01:14,349 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:14,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:14,350 INFO L85 PathProgramCache]: Analyzing trace with hash 889508821, now seen corresponding path program 1 times [2021-12-07 00:01:14,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:14,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141812888] [2021-12-07 00:01:14,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:14,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:14,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:14,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:14,403 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:14,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141812888] [2021-12-07 00:01:14,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141812888] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:01:14,404 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:01:14,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-07 00:01:14,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206878358] [2021-12-07 00:01:14,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:01:14,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-07 00:01:14,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:14,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-07 00:01:14,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:01:14,406 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:14,424 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-12-07 00:01:14,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-07 00:01:14,425 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-07 00:01:14,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:14,425 INFO L225 Difference]: With dead ends: 25 [2021-12-07 00:01:14,425 INFO L226 Difference]: Without dead ends: 25 [2021-12-07 00:01:14,426 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:01:14,427 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 10 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:14,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 41 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:14,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-12-07 00:01:14,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-12-07 00:01:14,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 21 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-07 00:01:14,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-12-07 00:01:14,433 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 6 [2021-12-07 00:01:14,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:14,433 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-12-07 00:01:14,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,433 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-12-07 00:01:14,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-07 00:01:14,434 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:14,434 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-07 00:01:14,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-07 00:01:14,434 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:14,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:14,435 INFO L85 PathProgramCache]: Analyzing trace with hash 889568456, now seen corresponding path program 1 times [2021-12-07 00:01:14,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:14,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724657897] [2021-12-07 00:01:14,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:14,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:14,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:14,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:14,479 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:14,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724657897] [2021-12-07 00:01:14,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724657897] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:01:14,479 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:01:14,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-07 00:01:14,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319569672] [2021-12-07 00:01:14,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:01:14,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-07 00:01:14,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:14,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-07 00:01:14,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:01:14,480 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:14,510 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-12-07 00:01:14,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-07 00:01:14,510 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-07 00:01:14,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:14,511 INFO L225 Difference]: With dead ends: 34 [2021-12-07 00:01:14,511 INFO L226 Difference]: Without dead ends: 34 [2021-12-07 00:01:14,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-07 00:01:14,512 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 23 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:14,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 48 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:14,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-12-07 00:01:14,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2021-12-07 00:01:14,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.35) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-07 00:01:14,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-12-07 00:01:14,516 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 6 [2021-12-07 00:01:14,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:14,516 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-12-07 00:01:14,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,516 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-12-07 00:01:14,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-07 00:01:14,517 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:14,517 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:14,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-07 00:01:14,517 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting strlen_recErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:14,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:14,518 INFO L85 PathProgramCache]: Analyzing trace with hash -590943170, now seen corresponding path program 1 times [2021-12-07 00:01:14,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:14,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93158740] [2021-12-07 00:01:14,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:14,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:14,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:14,548 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:14,548 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:14,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93158740] [2021-12-07 00:01:14,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93158740] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:01:14,548 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:01:14,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-07 00:01:14,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112274122] [2021-12-07 00:01:14,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:01:14,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-07 00:01:14,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:14,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-07 00:01:14,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-07 00:01:14,550 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 5 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:14,579 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-12-07 00:01:14,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-07 00:01:14,580 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-12-07 00:01:14,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:14,581 INFO L225 Difference]: With dead ends: 26 [2021-12-07 00:01:14,581 INFO L226 Difference]: Without dead ends: 26 [2021-12-07 00:01:14,581 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-07 00:01:14,582 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 19 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:14,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 34 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:14,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-12-07 00:01:14,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-12-07 00:01:14,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.3) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-07 00:01:14,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-12-07 00:01:14,587 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 9 [2021-12-07 00:01:14,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:14,588 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-12-07 00:01:14,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,588 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-12-07 00:01:14,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-07 00:01:14,589 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:14,589 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:14,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-07 00:01:14,589 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:14,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:14,590 INFO L85 PathProgramCache]: Analyzing trace with hash -590943169, now seen corresponding path program 1 times [2021-12-07 00:01:14,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:14,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203285847] [2021-12-07 00:01:14,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:14,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:14,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:14,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:14,647 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:14,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203285847] [2021-12-07 00:01:14,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203285847] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:01:14,647 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:01:14,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-07 00:01:14,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501482943] [2021-12-07 00:01:14,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:01:14,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-07 00:01:14,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:14,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-07 00:01:14,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-07 00:01:14,648 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:14,690 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2021-12-07 00:01:14,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-07 00:01:14,691 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-12-07 00:01:14,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:14,691 INFO L225 Difference]: With dead ends: 33 [2021-12-07 00:01:14,692 INFO L226 Difference]: Without dead ends: 33 [2021-12-07 00:01:14,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-07 00:01:14,692 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 28 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:14,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 60 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:14,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-12-07 00:01:14,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-12-07 00:01:14,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.28) internal successors, (32), 27 states have internal predecessors, (32), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-07 00:01:14,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2021-12-07 00:01:14,696 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 9 [2021-12-07 00:01:14,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:14,696 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2021-12-07 00:01:14,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:14,697 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2021-12-07 00:01:14,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-07 00:01:14,697 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:14,697 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:14,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-07 00:01:14,697 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:14,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:14,698 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2021-12-07 00:01:14,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:14,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309750044] [2021-12-07 00:01:14,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:14,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:14,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:14,749 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:14,750 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:14,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309750044] [2021-12-07 00:01:14,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309750044] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:14,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276169327] [2021-12-07 00:01:14,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:14,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:14,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:14,751 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:14,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-07 00:01:14,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:14,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-07 00:01:14,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:14,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:01:14,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:14,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:15,046 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:15,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276169327] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:15,047 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:15,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-12-07 00:01:15,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319540583] [2021-12-07 00:01:15,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:15,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-07 00:01:15,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:15,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-07 00:01:15,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-12-07 00:01:15,049 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:15,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:15,136 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-12-07 00:01:15,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-07 00:01:15,137 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-07 00:01:15,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:15,137 INFO L225 Difference]: With dead ends: 45 [2021-12-07 00:01:15,138 INFO L226 Difference]: Without dead ends: 45 [2021-12-07 00:01:15,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-12-07 00:01:15,139 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 34 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:15,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 84 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-07 00:01:15,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-07 00:01:15,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 30. [2021-12-07 00:01:15,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-07 00:01:15,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-12-07 00:01:15,144 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 10 [2021-12-07 00:01:15,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:15,145 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-12-07 00:01:15,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:15,145 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-12-07 00:01:15,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-07 00:01:15,146 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:15,146 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:15,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-07 00:01:15,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-12-07 00:01:15,346 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:15,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:15,347 INFO L85 PathProgramCache]: Analyzing trace with hash 182504998, now seen corresponding path program 1 times [2021-12-07 00:01:15,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:15,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450104027] [2021-12-07 00:01:15,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:15,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:15,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:15,425 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:15,426 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:15,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450104027] [2021-12-07 00:01:15,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450104027] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:01:15,426 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:01:15,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-07 00:01:15,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790772452] [2021-12-07 00:01:15,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:01:15,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-07 00:01:15,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:15,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-07 00:01:15,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-12-07 00:01:15,427 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:15,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:15,470 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2021-12-07 00:01:15,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-07 00:01:15,470 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-07 00:01:15,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:15,471 INFO L225 Difference]: With dead ends: 40 [2021-12-07 00:01:15,471 INFO L226 Difference]: Without dead ends: 40 [2021-12-07 00:01:15,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-12-07 00:01:15,472 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:15,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 96 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:15,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-12-07 00:01:15,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2021-12-07 00:01:15,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 30 states have internal predecessors, (33), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-07 00:01:15,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-12-07 00:01:15,478 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 13 [2021-12-07 00:01:15,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:15,478 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-12-07 00:01:15,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:15,478 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-12-07 00:01:15,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-07 00:01:15,479 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:15,479 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:15,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-07 00:01:15,479 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:15,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:15,480 INFO L85 PathProgramCache]: Analyzing trace with hash 883569576, now seen corresponding path program 1 times [2021-12-07 00:01:15,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:15,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055993635] [2021-12-07 00:01:15,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:15,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:15,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:15,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:15,559 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:15,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055993635] [2021-12-07 00:01:15,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055993635] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:01:15,559 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:01:15,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-07 00:01:15,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636500609] [2021-12-07 00:01:15,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:01:15,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-07 00:01:15,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:15,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-07 00:01:15,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-07 00:01:15,561 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:15,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:15,623 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-12-07 00:01:15,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-07 00:01:15,623 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-07 00:01:15,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:15,625 INFO L225 Difference]: With dead ends: 51 [2021-12-07 00:01:15,625 INFO L226 Difference]: Without dead ends: 51 [2021-12-07 00:01:15,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-12-07 00:01:15,626 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:15,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 92 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:15,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-07 00:01:15,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 38. [2021-12-07 00:01:15,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.206896551724138) internal successors, (35), 31 states have internal predecessors, (35), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-07 00:01:15,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-12-07 00:01:15,632 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 13 [2021-12-07 00:01:15,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:15,632 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-12-07 00:01:15,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:15,632 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-12-07 00:01:15,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-07 00:01:15,633 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:15,633 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:15,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-12-07 00:01:15,633 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:15,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:15,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1361686065, now seen corresponding path program 1 times [2021-12-07 00:01:15,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:15,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787379873] [2021-12-07 00:01:15,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:15,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:15,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:15,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-07 00:01:15,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:15,678 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:15,678 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:15,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787379873] [2021-12-07 00:01:15,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787379873] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:01:15,679 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:01:15,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-07 00:01:15,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900681633] [2021-12-07 00:01:15,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:01:15,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-07 00:01:15,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:15,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-07 00:01:15,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:01:15,680 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-07 00:01:15,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:15,692 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2021-12-07 00:01:15,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-07 00:01:15,692 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-12-07 00:01:15,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:15,692 INFO L225 Difference]: With dead ends: 37 [2021-12-07 00:01:15,692 INFO L226 Difference]: Without dead ends: 20 [2021-12-07 00:01:15,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:01:15,693 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 5 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:15,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 41 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:15,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-12-07 00:01:15,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-12-07 00:01:15,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:15,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-12-07 00:01:15,696 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2021-12-07 00:01:15,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:15,696 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-12-07 00:01:15,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-07 00:01:15,696 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-12-07 00:01:15,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-07 00:01:15,697 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:15,697 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:15,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-12-07 00:01:15,697 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:15,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:15,697 INFO L85 PathProgramCache]: Analyzing trace with hash 312590597, now seen corresponding path program 1 times [2021-12-07 00:01:15,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:15,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886514718] [2021-12-07 00:01:15,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:15,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:15,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:15,786 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:15,786 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:15,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886514718] [2021-12-07 00:01:15,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886514718] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:15,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367060310] [2021-12-07 00:01:15,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:15,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:15,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:15,787 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:15,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-07 00:01:15,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:15,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-07 00:01:15,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:15,910 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:15,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:16,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-07 00:01:16,034 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:16,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367060310] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:16,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:16,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 20 [2021-12-07 00:01:16,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826133006] [2021-12-07 00:01:16,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:16,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-07 00:01:16,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:16,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-07 00:01:16,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-12-07 00:01:16,036 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 21 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:16,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:16,123 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-12-07 00:01:16,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-07 00:01:16,123 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-12-07 00:01:16,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:16,123 INFO L225 Difference]: With dead ends: 27 [2021-12-07 00:01:16,124 INFO L226 Difference]: Without dead ends: 27 [2021-12-07 00:01:16,124 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2021-12-07 00:01:16,125 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 42 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:16,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 57 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:01:16,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-12-07 00:01:16,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 22. [2021-12-07 00:01:16,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:16,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-12-07 00:01:16,128 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-12-07 00:01:16,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:16,128 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-12-07 00:01:16,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:16,128 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-12-07 00:01:16,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-07 00:01:16,129 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:16,129 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:16,148 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-07 00:01:16,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-07 00:01:16,331 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:16,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:16,332 INFO L85 PathProgramCache]: Analyzing trace with hash 2048380908, now seen corresponding path program 2 times [2021-12-07 00:01:16,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:16,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456968753] [2021-12-07 00:01:16,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:16,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:16,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:16,529 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:16,529 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:16,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456968753] [2021-12-07 00:01:16,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456968753] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:16,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510656750] [2021-12-07 00:01:16,530 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:01:16,530 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:16,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:16,531 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:16,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-07 00:01:16,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:01:16,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:16,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-07 00:01:16,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:16,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:01:16,903 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:01:16,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:01:17,005 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:17,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:17,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:17,309 INFO L388 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 15 treesize of output 11 [2021-12-07 00:01:17,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:17,330 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:17,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [510656750] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:17,331 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:17,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 34 [2021-12-07 00:01:17,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171904340] [2021-12-07 00:01:17,331 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:17,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-07 00:01:17,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:17,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-07 00:01:17,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1016, Unknown=0, NotChecked=0, Total=1122 [2021-12-07 00:01:17,333 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 26 states have internal predecessors, (42), 9 states have call successors, (9), 9 states have call predecessors, (9), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:17,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:17,656 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-12-07 00:01:17,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-07 00:01:17,656 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 26 states have internal predecessors, (42), 9 states have call successors, (9), 9 states have call predecessors, (9), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-12-07 00:01:17,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:17,656 INFO L225 Difference]: With dead ends: 44 [2021-12-07 00:01:17,656 INFO L226 Difference]: Without dead ends: 35 [2021-12-07 00:01:17,657 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=202, Invalid=1868, Unknown=0, NotChecked=0, Total=2070 [2021-12-07 00:01:17,658 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 37 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:17,659 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 120 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 79 Invalid, 0 Unknown, 108 Unchecked, 0.0s Time] [2021-12-07 00:01:17,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-12-07 00:01:17,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2021-12-07 00:01:17,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:17,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-12-07 00:01:17,662 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 21 [2021-12-07 00:01:17,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:17,662 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-12-07 00:01:17,662 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 26 states have internal predecessors, (42), 9 states have call successors, (9), 9 states have call predecessors, (9), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:17,662 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-12-07 00:01:17,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-07 00:01:17,663 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:17,663 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:17,683 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-07 00:01:17,864 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-07 00:01:17,865 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:17,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:17,867 INFO L85 PathProgramCache]: Analyzing trace with hash 2083749168, now seen corresponding path program 3 times [2021-12-07 00:01:17,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:17,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981173698] [2021-12-07 00:01:17,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:17,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:17,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:18,030 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:18,030 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:18,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981173698] [2021-12-07 00:01:18,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981173698] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:18,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812958335] [2021-12-07 00:01:18,030 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:01:18,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:18,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:18,031 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:18,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-07 00:01:18,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-07 00:01:18,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:18,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-07 00:01:18,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:18,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:01:18,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:01:18,290 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:18,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:18,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:18,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:18,446 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:18,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812958335] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:18,446 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:18,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2021-12-07 00:01:18,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538102571] [2021-12-07 00:01:18,446 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:18,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-07 00:01:18,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:18,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-07 00:01:18,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=672, Unknown=0, NotChecked=0, Total=756 [2021-12-07 00:01:18,448 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 28 states, 25 states have (on average 1.92) internal successors, (48), 23 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:18,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:18,622 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2021-12-07 00:01:18,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-07 00:01:18,622 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 1.92) internal successors, (48), 23 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-12-07 00:01:18,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:18,622 INFO L225 Difference]: With dead ends: 50 [2021-12-07 00:01:18,623 INFO L226 Difference]: Without dead ends: 37 [2021-12-07 00:01:18,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=1119, Unknown=0, NotChecked=0, Total=1260 [2021-12-07 00:01:18,624 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 50 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:18,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 114 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 190 Invalid, 0 Unknown, 50 Unchecked, 0.1s Time] [2021-12-07 00:01:18,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-07 00:01:18,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2021-12-07 00:01:18,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:18,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-12-07 00:01:18,626 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2021-12-07 00:01:18,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:18,626 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-12-07 00:01:18,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 1.92) internal successors, (48), 23 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:18,627 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-12-07 00:01:18,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-07 00:01:18,627 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:18,627 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:18,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-07 00:01:18,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:18,829 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:18,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:18,830 INFO L85 PathProgramCache]: Analyzing trace with hash 1764143245, now seen corresponding path program 4 times [2021-12-07 00:01:18,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:18,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049007288] [2021-12-07 00:01:18,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:18,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:18,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:19,029 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:19,029 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:19,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049007288] [2021-12-07 00:01:19,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049007288] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:19,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576166350] [2021-12-07 00:01:19,030 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 00:01:19,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:19,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:19,030 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:19,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-07 00:01:19,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 00:01:19,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:19,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-07 00:01:19,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:19,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:01:19,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-07 00:01:19,362 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:01:19,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:01:19,470 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:19,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:19,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:19,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:20,206 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 15 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:20,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576166350] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:20,206 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:20,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 44 [2021-12-07 00:01:20,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241727361] [2021-12-07 00:01:20,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:20,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-07 00:01:20,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:20,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-07 00:01:20,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1795, Unknown=0, NotChecked=0, Total=1980 [2021-12-07 00:01:20,208 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 45 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 33 states have internal predecessors, (77), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:20,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:20,839 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-12-07 00:01:20,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-07 00:01:20,839 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 33 states have internal predecessors, (77), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-12-07 00:01:20,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:20,840 INFO L225 Difference]: With dead ends: 44 [2021-12-07 00:01:20,840 INFO L226 Difference]: Without dead ends: 44 [2021-12-07 00:01:20,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=363, Invalid=3177, Unknown=0, NotChecked=0, Total=3540 [2021-12-07 00:01:20,842 INFO L933 BasicCegarLoop]: 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, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:20,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 203 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 513 Invalid, 0 Unknown, 53 Unchecked, 0.2s Time] [2021-12-07 00:01:20,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-12-07 00:01:20,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2021-12-07 00:01:20,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:20,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-12-07 00:01:20,846 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 33 [2021-12-07 00:01:20,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:20,846 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-12-07 00:01:20,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 33 states have internal predecessors, (77), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:20,847 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-12-07 00:01:20,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-07 00:01:20,848 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:20,848 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:20,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-07 00:01:21,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-07 00:01:21,048 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:21,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:21,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1125055195, now seen corresponding path program 5 times [2021-12-07 00:01:21,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:21,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711568616] [2021-12-07 00:01:21,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:21,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:21,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:21,211 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:21,211 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:21,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711568616] [2021-12-07 00:01:21,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1711568616] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:21,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403252558] [2021-12-07 00:01:21,211 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-07 00:01:21,211 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:21,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:21,212 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:21,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-07 00:01:21,255 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-07 00:01:21,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:21,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 42 conjunts are in the unsatisfiable core [2021-12-07 00:01:21,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:21,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:01:21,570 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:21,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:21,752 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:21,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403252558] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:21,752 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:21,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2021-12-07 00:01:21,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16817806] [2021-12-07 00:01:21,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:21,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-07 00:01:21,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:21,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-07 00:01:21,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1276, Unknown=0, NotChecked=0, Total=1482 [2021-12-07 00:01:21,755 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 28 states have internal predecessors, (82), 13 states have call successors, (13), 12 states have call predecessors, (13), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:21,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:21,977 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2021-12-07 00:01:21,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-07 00:01:21,978 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 28 states have internal predecessors, (82), 13 states have call successors, (13), 12 states have call predecessors, (13), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-12-07 00:01:21,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:21,978 INFO L225 Difference]: With dead ends: 69 [2021-12-07 00:01:21,978 INFO L226 Difference]: Without dead ends: 49 [2021-12-07 00:01:21,979 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=326, Invalid=1930, Unknown=0, NotChecked=0, Total=2256 [2021-12-07 00:01:21,979 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 59 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:21,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 147 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-07 00:01:21,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-12-07 00:01:21,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-12-07 00:01:21,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:21,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-12-07 00:01:21,982 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2021-12-07 00:01:21,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:21,982 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-12-07 00:01:21,983 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 28 states have internal predecessors, (82), 13 states have call successors, (13), 12 states have call predecessors, (13), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:21,983 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-12-07 00:01:21,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-07 00:01:21,983 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:21,984 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:22,003 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-12-07 00:01:22,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-12-07 00:01:22,185 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:22,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:22,187 INFO L85 PathProgramCache]: Analyzing trace with hash 459737784, now seen corresponding path program 6 times [2021-12-07 00:01:22,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:22,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170784957] [2021-12-07 00:01:22,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:22,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:22,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:22,404 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:22,405 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:22,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170784957] [2021-12-07 00:01:22,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170784957] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:22,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291965352] [2021-12-07 00:01:22,405 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-07 00:01:22,405 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:22,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:22,406 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:22,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-07 00:01:22,452 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-07 00:01:22,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:22,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-07 00:01:22,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:22,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:01:22,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:01:22,703 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:22,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:22,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:22,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:22,874 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:22,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291965352] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:22,875 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:22,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2021-12-07 00:01:22,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394193262] [2021-12-07 00:01:22,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:22,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-07 00:01:22,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:22,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-07 00:01:22,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2021-12-07 00:01:22,877 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 36 states, 33 states have (on average 2.121212121212121) internal successors, (70), 29 states have internal predecessors, (70), 10 states have call successors, (10), 8 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:23,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:23,200 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2021-12-07 00:01:23,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-07 00:01:23,200 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.121212121212121) internal successors, (70), 29 states have internal predecessors, (70), 10 states have call successors, (10), 8 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-12-07 00:01:23,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:23,201 INFO L225 Difference]: With dead ends: 74 [2021-12-07 00:01:23,201 INFO L226 Difference]: Without dead ends: 53 [2021-12-07 00:01:23,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=177, Invalid=2079, Unknown=0, NotChecked=0, Total=2256 [2021-12-07 00:01:23,203 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 54 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:23,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 270 Invalid, 676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 635 Invalid, 0 Unknown, 33 Unchecked, 0.2s Time] [2021-12-07 00:01:23,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-12-07 00:01:23,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2021-12-07 00:01:23,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:23,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-12-07 00:01:23,206 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 45 [2021-12-07 00:01:23,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:23,207 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-12-07 00:01:23,207 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.121212121212121) internal successors, (70), 29 states have internal predecessors, (70), 10 states have call successors, (10), 8 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:23,207 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-12-07 00:01:23,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-07 00:01:23,208 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:23,208 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:23,227 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-12-07 00:01:23,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-07 00:01:23,410 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:23,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:23,411 INFO L85 PathProgramCache]: Analyzing trace with hash -414587883, now seen corresponding path program 7 times [2021-12-07 00:01:23,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:23,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420680064] [2021-12-07 00:01:23,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:23,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:23,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:23,619 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:23,619 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:23,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420680064] [2021-12-07 00:01:23,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420680064] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:23,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287377287] [2021-12-07 00:01:23,619 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-07 00:01:23,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:23,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:23,620 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:23,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-07 00:01:23,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:23,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 57 conjunts are in the unsatisfiable core [2021-12-07 00:01:23,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:23,854 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:23,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:24,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-07 00:01:24,184 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:24,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287377287] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:24,184 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:24,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21, 21] total 43 [2021-12-07 00:01:24,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933679990] [2021-12-07 00:01:24,184 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:24,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-07 00:01:24,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:24,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-07 00:01:24,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1729, Unknown=0, NotChecked=0, Total=1892 [2021-12-07 00:01:24,186 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 44 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 31 states have internal predecessors, (87), 14 states have call successors, (14), 13 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:24,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:24,586 INFO L93 Difference]: Finished difference Result 56 states and 57 transitions. [2021-12-07 00:01:24,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-07 00:01:24,586 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 31 states have internal predecessors, (87), 14 states have call successors, (14), 13 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-12-07 00:01:24,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:24,587 INFO L225 Difference]: With dead ends: 56 [2021-12-07 00:01:24,587 INFO L226 Difference]: Without dead ends: 56 [2021-12-07 00:01:24,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=290, Invalid=2680, Unknown=0, NotChecked=0, Total=2970 [2021-12-07 00:01:24,588 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 101 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:24,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 306 Invalid, 833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 820 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-07 00:01:24,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-12-07 00:01:24,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2021-12-07 00:01:24,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 7 states have call successors, (7), 7 states have call predecessors, (7), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:24,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-12-07 00:01:24,591 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 49 [2021-12-07 00:01:24,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:24,591 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-12-07 00:01:24,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 31 states have internal predecessors, (87), 14 states have call successors, (14), 13 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:24,591 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-12-07 00:01:24,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-07 00:01:24,592 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:24,592 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:24,611 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-12-07 00:01:24,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-07 00:01:24,793 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:24,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:24,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1462244612, now seen corresponding path program 8 times [2021-12-07 00:01:24,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:24,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631325417] [2021-12-07 00:01:24,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:24,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:24,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:25,030 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 17 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:25,030 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:25,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631325417] [2021-12-07 00:01:25,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [631325417] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:25,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930586392] [2021-12-07 00:01:25,030 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:01:25,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:25,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:25,031 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:25,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-07 00:01:25,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:01:25,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:25,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 72 conjunts are in the unsatisfiable core [2021-12-07 00:01:25,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:25,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:01:26,049 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:01:26,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:01:26,204 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:26,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:27,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:27,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:27,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 27 [2021-12-07 00:01:27,057 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 28 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:27,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930586392] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:27,057 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:27,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 66 [2021-12-07 00:01:27,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615423030] [2021-12-07 00:01:27,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:27,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-12-07 00:01:27,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:27,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-12-07 00:01:27,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=4043, Unknown=0, NotChecked=0, Total=4290 [2021-12-07 00:01:27,059 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 66 states, 61 states have (on average 1.8032786885245902) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 21 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:28,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:28,079 INFO L93 Difference]: Finished difference Result 92 states and 93 transitions. [2021-12-07 00:01:28,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-12-07 00:01:28,080 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 61 states have (on average 1.8032786885245902) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 21 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-12-07 00:01:28,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:28,080 INFO L225 Difference]: With dead ends: 92 [2021-12-07 00:01:28,080 INFO L226 Difference]: Without dead ends: 67 [2021-12-07 00:01:28,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=444, Invalid=6866, Unknown=0, NotChecked=0, Total=7310 [2021-12-07 00:01:28,083 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 67 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 667 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 578 SdHoareTripleChecker+Invalid, 919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 240 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:28,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 578 Invalid, 919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 667 Invalid, 0 Unknown, 240 Unchecked, 0.2s Time] [2021-12-07 00:01:28,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-12-07 00:01:28,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2021-12-07 00:01:28,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 8 states have call successors, (8), 8 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:28,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-12-07 00:01:28,085 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 53 [2021-12-07 00:01:28,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:28,086 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-12-07 00:01:28,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 61 states have (on average 1.8032786885245902) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 21 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:28,086 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-12-07 00:01:28,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-07 00:01:28,086 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:28,086 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:28,106 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-12-07 00:01:28,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-07 00:01:28,288 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:28,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:28,289 INFO L85 PathProgramCache]: Analyzing trace with hash 329833536, now seen corresponding path program 9 times [2021-12-07 00:01:28,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:28,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472716133] [2021-12-07 00:01:28,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:28,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:28,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:28,608 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:28,608 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:28,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472716133] [2021-12-07 00:01:28,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472716133] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:28,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606954662] [2021-12-07 00:01:28,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:01:28,608 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:28,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:28,609 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:28,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-07 00:01:28,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-07 00:01:28,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:28,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 80 conjunts are in the unsatisfiable core [2021-12-07 00:01:28,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:28,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:01:29,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:01:29,004 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:29,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:29,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:29,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:29,203 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:29,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [606954662] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:29,204 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:29,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 44 [2021-12-07 00:01:29,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442924641] [2021-12-07 00:01:29,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:29,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-07 00:01:29,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:29,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-07 00:01:29,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1772, Unknown=0, NotChecked=0, Total=1892 [2021-12-07 00:01:29,205 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 44 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 35 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:29,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:29,765 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2021-12-07 00:01:29,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-07 00:01:29,765 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 35 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-12-07 00:01:29,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:29,766 INFO L225 Difference]: With dead ends: 98 [2021-12-07 00:01:29,766 INFO L226 Difference]: Without dead ends: 69 [2021-12-07 00:01:29,767 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 102 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=213, Invalid=3327, Unknown=0, NotChecked=0, Total=3540 [2021-12-07 00:01:29,767 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 51 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 1314 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 518 SdHoareTripleChecker+Invalid, 1367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:29,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 518 Invalid, 1367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1314 Invalid, 0 Unknown, 44 Unchecked, 0.3s Time] [2021-12-07 00:01:29,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-07 00:01:29,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2021-12-07 00:01:29,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 8 states have call successors, (8), 8 states have call predecessors, (8), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:29,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-12-07 00:01:29,770 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2021-12-07 00:01:29,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:29,770 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-12-07 00:01:29,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 35 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:29,770 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-12-07 00:01:29,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-12-07 00:01:29,771 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:29,771 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:29,790 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-12-07 00:01:29,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:29,973 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:29,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:29,974 INFO L85 PathProgramCache]: Analyzing trace with hash 644832157, now seen corresponding path program 10 times [2021-12-07 00:01:29,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:29,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66124260] [2021-12-07 00:01:29,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:29,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:30,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:30,306 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:30,307 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:30,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66124260] [2021-12-07 00:01:30,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66124260] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:30,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025151566] [2021-12-07 00:01:30,307 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 00:01:30,307 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:30,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:30,308 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:30,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-07 00:01:30,357 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 00:01:30,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:30,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 88 conjunts are in the unsatisfiable core [2021-12-07 00:01:30,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:30,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:01:30,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-07 00:01:31,100 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:01:31,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:01:31,252 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 72 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:31,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:32,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:32,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:33,078 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 91 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:33,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025151566] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:33,078 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:33,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 29, 29] total 76 [2021-12-07 00:01:33,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569914027] [2021-12-07 00:01:33,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:33,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-12-07 00:01:33,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:33,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-12-07 00:01:33,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=5413, Unknown=0, NotChecked=0, Total=5852 [2021-12-07 00:01:33,081 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 77 states, 71 states have (on average 2.0422535211267605) internal successors, (145), 53 states have internal predecessors, (145), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:34,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:34,621 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2021-12-07 00:01:34,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-07 00:01:34,621 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 71 states have (on average 2.0422535211267605) internal successors, (145), 53 states have internal predecessors, (145), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-12-07 00:01:34,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:34,622 INFO L225 Difference]: With dead ends: 76 [2021-12-07 00:01:34,622 INFO L226 Difference]: Without dead ends: 76 [2021-12-07 00:01:34,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=797, Invalid=9103, Unknown=0, NotChecked=0, Total=9900 [2021-12-07 00:01:34,625 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 200 mSDsluCounter, 490 mSDsCounter, 0 mSdLazyCounter, 1476 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 518 SdHoareTripleChecker+Invalid, 1586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:34,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 518 Invalid, 1586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 1476 Invalid, 0 Unknown, 84 Unchecked, 0.5s Time] [2021-12-07 00:01:34,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-07 00:01:34,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2021-12-07 00:01:34,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:34,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-12-07 00:01:34,627 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 65 [2021-12-07 00:01:34,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:34,628 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-12-07 00:01:34,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 71 states have (on average 2.0422535211267605) internal successors, (145), 53 states have internal predecessors, (145), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:34,628 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-12-07 00:01:34,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-12-07 00:01:34,629 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:34,629 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:34,648 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-12-07 00:01:34,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:34,830 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:34,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:34,831 INFO L85 PathProgramCache]: Analyzing trace with hash 851678699, now seen corresponding path program 11 times [2021-12-07 00:01:34,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:34,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013177573] [2021-12-07 00:01:34,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:34,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:34,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:35,132 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 132 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:35,133 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:35,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013177573] [2021-12-07 00:01:35,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2013177573] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:35,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060547499] [2021-12-07 00:01:35,133 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-07 00:01:35,133 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:35,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:35,134 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:35,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-07 00:01:35,202 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-12-07 00:01:35,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:35,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 70 conjunts are in the unsatisfiable core [2021-12-07 00:01:35,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:35,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:01:35,827 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:35,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:36,216 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 162 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:36,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060547499] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:36,216 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:36,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 67 [2021-12-07 00:01:36,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302125310] [2021-12-07 00:01:36,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:36,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-12-07 00:01:36,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:36,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-12-07 00:01:36,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=3862, Unknown=0, NotChecked=0, Total=4422 [2021-12-07 00:01:36,220 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 48 states have internal predecessors, (154), 21 states have call successors, (21), 20 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:36,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:36,634 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2021-12-07 00:01:36,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-07 00:01:36,634 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 48 states have internal predecessors, (154), 21 states have call successors, (21), 20 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-12-07 00:01:36,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:36,635 INFO L225 Difference]: With dead ends: 117 [2021-12-07 00:01:36,635 INFO L226 Difference]: Without dead ends: 81 [2021-12-07 00:01:36,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2047 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=930, Invalid=6042, Unknown=0, NotChecked=0, Total=6972 [2021-12-07 00:01:36,636 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 93 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 640 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:36,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 227 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 640 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-07 00:01:36,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-12-07 00:01:36,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2021-12-07 00:01:36,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:36,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2021-12-07 00:01:36,638 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 73 [2021-12-07 00:01:36,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:36,638 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2021-12-07 00:01:36,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 48 states have internal predecessors, (154), 21 states have call successors, (21), 20 states have call predecessors, (21), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:36,639 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2021-12-07 00:01:36,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-12-07 00:01:36,639 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:36,639 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:36,658 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-12-07 00:01:36,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:36,841 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:36,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:36,842 INFO L85 PathProgramCache]: Analyzing trace with hash -228789816, now seen corresponding path program 12 times [2021-12-07 00:01:36,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:36,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353890929] [2021-12-07 00:01:36,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:36,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:36,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:37,256 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:37,256 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:37,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353890929] [2021-12-07 00:01:37,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353890929] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:37,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794901758] [2021-12-07 00:01:37,257 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-07 00:01:37,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:37,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:37,257 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:37,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-07 00:01:37,391 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-12-07 00:01:37,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:37,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 100 conjunts are in the unsatisfiable core [2021-12-07 00:01:37,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:37,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:01:37,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:01:37,818 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:37,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:37,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:37,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:38,082 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 26 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:38,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794901758] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:38,082 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:38,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 52 [2021-12-07 00:01:38,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804993362] [2021-12-07 00:01:38,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:38,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-12-07 00:01:38,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:38,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-12-07 00:01:38,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2514, Unknown=0, NotChecked=0, Total=2652 [2021-12-07 00:01:38,084 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 52 states, 49 states have (on average 2.326530612244898) internal successors, (114), 41 states have internal predecessors, (114), 14 states have call successors, (14), 12 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:38,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:38,893 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2021-12-07 00:01:38,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-07 00:01:38,894 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 49 states have (on average 2.326530612244898) internal successors, (114), 41 states have internal predecessors, (114), 14 states have call successors, (14), 12 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-12-07 00:01:38,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:38,894 INFO L225 Difference]: With dead ends: 122 [2021-12-07 00:01:38,894 INFO L226 Difference]: Without dead ends: 85 [2021-12-07 00:01:38,895 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=249, Invalid=4863, Unknown=0, NotChecked=0, Total=5112 [2021-12-07 00:01:38,895 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 62 mSDsluCounter, 715 mSDsCounter, 0 mSdLazyCounter, 1953 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 745 SdHoareTripleChecker+Invalid, 2018 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1953 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:38,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 745 Invalid, 2018 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1953 Invalid, 0 Unknown, 54 Unchecked, 0.4s Time] [2021-12-07 00:01:38,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-12-07 00:01:38,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2021-12-07 00:01:38,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:38,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-12-07 00:01:38,898 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2021-12-07 00:01:38,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:38,898 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-12-07 00:01:38,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 49 states have (on average 2.326530612244898) internal successors, (114), 41 states have internal predecessors, (114), 14 states have call successors, (14), 12 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:38,898 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-12-07 00:01:38,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-12-07 00:01:38,898 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:38,899 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:38,918 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-07 00:01:39,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-07 00:01:39,100 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:39,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:39,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1274746661, now seen corresponding path program 13 times [2021-12-07 00:01:39,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:39,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812865122] [2021-12-07 00:01:39,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:39,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:39,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:39,539 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 91 proven. 224 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:39,539 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:39,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812865122] [2021-12-07 00:01:39,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812865122] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:39,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165165521] [2021-12-07 00:01:39,539 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-07 00:01:39,539 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:39,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:39,540 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:39,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-07 00:01:39,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:39,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 93 conjunts are in the unsatisfiable core [2021-12-07 00:01:39,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:39,967 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:39,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:40,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-07 00:01:40,647 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 120 proven. 195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:40,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165165521] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:40,647 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:40,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 33, 33] total 67 [2021-12-07 00:01:40,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050389120] [2021-12-07 00:01:40,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:40,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-12-07 00:01:40,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:40,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-12-07 00:01:40,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=4225, Unknown=0, NotChecked=0, Total=4556 [2021-12-07 00:01:40,649 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 68 states, 65 states have (on average 2.2) internal successors, (143), 47 states have internal predecessors, (143), 22 states have call successors, (22), 21 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:41,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:41,527 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2021-12-07 00:01:41,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-07 00:01:41,527 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 65 states have (on average 2.2) internal successors, (143), 47 states have internal predecessors, (143), 22 states have call successors, (22), 21 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-12-07 00:01:41,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:41,528 INFO L225 Difference]: With dead ends: 88 [2021-12-07 00:01:41,528 INFO L226 Difference]: Without dead ends: 88 [2021-12-07 00:01:41,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 123 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1383 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=640, Invalid=6842, Unknown=0, NotChecked=0, Total=7482 [2021-12-07 00:01:41,529 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 191 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 1861 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 1879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1861 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:41,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 666 Invalid, 1879 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1861 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-07 00:01:41,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-12-07 00:01:41,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2021-12-07 00:01:41,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 11 states have call successors, (11), 11 states have call predecessors, (11), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:41,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-12-07 00:01:41,531 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 81 [2021-12-07 00:01:41,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:41,532 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-12-07 00:01:41,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 65 states have (on average 2.2) internal successors, (143), 47 states have internal predecessors, (143), 22 states have call successors, (22), 21 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:41,532 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-12-07 00:01:41,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-12-07 00:01:41,532 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:41,532 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:41,553 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-12-07 00:01:41,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-12-07 00:01:41,733 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:41,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:41,733 INFO L85 PathProgramCache]: Analyzing trace with hash 479794700, now seen corresponding path program 14 times [2021-12-07 00:01:41,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:41,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663633216] [2021-12-07 00:01:41,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:41,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:41,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:42,226 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 29 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:42,226 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:42,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663633216] [2021-12-07 00:01:42,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663633216] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:42,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775601188] [2021-12-07 00:01:42,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:01:42,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:42,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:42,227 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:42,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-07 00:01:42,285 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:01:42,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:42,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 108 conjunts are in the unsatisfiable core [2021-12-07 00:01:42,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:42,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:01:44,406 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:01:44,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:01:44,638 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:44,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:46,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:46,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:46,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 27 [2021-12-07 00:01:46,624 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 120 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:46,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775601188] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:46,625 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:46,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37] total 98 [2021-12-07 00:01:46,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178136359] [2021-12-07 00:01:46,625 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:46,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-12-07 00:01:46,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:46,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-12-07 00:01:46,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=9051, Unknown=0, NotChecked=0, Total=9506 [2021-12-07 00:01:46,627 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 98 states, 93 states have (on average 1.913978494623656) internal successors, (178), 66 states have internal predecessors, (178), 33 states have call successors, (33), 33 states have call predecessors, (33), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:48,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:48,840 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2021-12-07 00:01:48,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-12-07 00:01:48,840 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 93 states have (on average 1.913978494623656) internal successors, (178), 66 states have internal predecessors, (178), 33 states have call successors, (33), 33 states have call predecessors, (33), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-12-07 00:01:48,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:48,841 INFO L225 Difference]: With dead ends: 140 [2021-12-07 00:01:48,841 INFO L226 Difference]: Without dead ends: 99 [2021-12-07 00:01:48,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2153 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=792, Invalid=14958, Unknown=0, NotChecked=0, Total=15750 [2021-12-07 00:01:48,842 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 105 mSDsluCounter, 1167 mSDsCounter, 0 mSdLazyCounter, 1607 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 1203 SdHoareTripleChecker+Invalid, 2385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1607 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 764 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:48,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 1203 Invalid, 2385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1607 Invalid, 0 Unknown, 764 Unchecked, 0.4s Time] [2021-12-07 00:01:48,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-12-07 00:01:48,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 94. [2021-12-07 00:01:48,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:48,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-12-07 00:01:48,845 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 85 [2021-12-07 00:01:48,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:48,845 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-12-07 00:01:48,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 93 states have (on average 1.913978494623656) internal successors, (178), 66 states have internal predecessors, (178), 33 states have call successors, (33), 33 states have call predecessors, (33), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:48,845 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-12-07 00:01:48,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-12-07 00:01:48,846 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:48,846 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:48,865 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-12-07 00:01:49,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:49,047 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:49,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:49,048 INFO L85 PathProgramCache]: Analyzing trace with hash -790148272, now seen corresponding path program 15 times [2021-12-07 00:01:49,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:49,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486349271] [2021-12-07 00:01:49,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:49,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:49,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:49,627 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:49,627 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:49,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486349271] [2021-12-07 00:01:49,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486349271] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:49,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484581965] [2021-12-07 00:01:49,627 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:01:49,627 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:49,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:49,628 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:49,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-07 00:01:49,802 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-12-07 00:01:49,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:49,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 120 conjunts are in the unsatisfiable core [2021-12-07 00:01:49,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:50,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:01:50,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:01:50,424 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:50,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:50,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:50,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:50,713 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 32 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:50,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [484581965] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:50,713 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:50,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 60 [2021-12-07 00:01:50,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123392433] [2021-12-07 00:01:50,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:50,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-12-07 00:01:50,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:50,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-12-07 00:01:50,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=3384, Unknown=0, NotChecked=0, Total=3540 [2021-12-07 00:01:50,715 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 60 states, 57 states have (on average 2.3859649122807016) internal successors, (136), 47 states have internal predecessors, (136), 16 states have call successors, (16), 14 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:51,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:01:51,913 INFO L93 Difference]: Finished difference Result 146 states and 147 transitions. [2021-12-07 00:01:51,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-12-07 00:01:51,914 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 57 states have (on average 2.3859649122807016) internal successors, (136), 47 states have internal predecessors, (136), 16 states have call successors, (16), 14 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2021-12-07 00:01:51,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:01:51,915 INFO L225 Difference]: With dead ends: 146 [2021-12-07 00:01:51,915 INFO L226 Difference]: Without dead ends: 101 [2021-12-07 00:01:51,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 162 SyntacticMatches, 3 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=285, Invalid=6687, Unknown=0, NotChecked=0, Total=6972 [2021-12-07 00:01:51,916 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 71 mSDsluCounter, 1140 mSDsCounter, 0 mSdLazyCounter, 3107 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 1176 SdHoareTripleChecker+Invalid, 3234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 3107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-07 00:01:51,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 1176 Invalid, 3234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 3107 Invalid, 0 Unknown, 114 Unchecked, 0.7s Time] [2021-12-07 00:01:51,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-12-07 00:01:51,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 98. [2021-12-07 00:01:51,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 states have internal predecessors, (87), 12 states have call successors, (12), 12 states have call predecessors, (12), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:51,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-12-07 00:01:51,920 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 93 [2021-12-07 00:01:51,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:01:51,920 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-12-07 00:01:51,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 57 states have (on average 2.3859649122807016) internal successors, (136), 47 states have internal predecessors, (136), 16 states have call successors, (16), 14 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:01:51,920 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-12-07 00:01:51,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-12-07 00:01:51,921 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:01:51,921 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:01:51,941 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-12-07 00:01:52,122 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:52,123 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:01:52,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:01:52,124 INFO L85 PathProgramCache]: Analyzing trace with hash 156309165, now seen corresponding path program 16 times [2021-12-07 00:01:52,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:01:52,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390687371] [2021-12-07 00:01:52,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:01:52,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:01:52,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:01:52,694 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 153 proven. 320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:52,694 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:01:52,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390687371] [2021-12-07 00:01:52,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390687371] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:01:52,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604179608] [2021-12-07 00:01:52,695 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 00:01:52,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:01:52,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:01:52,695 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:01:52,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-07 00:01:52,757 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 00:01:52,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:01:52,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 124 conjunts are in the unsatisfiable core [2021-12-07 00:01:52,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:01:52,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:01:52,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-07 00:01:53,972 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:01:53,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:01:54,161 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 200 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:54,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:01:55,925 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:01:55,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:01:57,571 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 231 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:01:57,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604179608] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:01:57,571 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:01:57,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 41, 41] total 108 [2021-12-07 00:01:57,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412621020] [2021-12-07 00:01:57,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:01:57,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-12-07 00:01:57,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:01:57,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-12-07 00:01:57,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=805, Invalid=10967, Unknown=0, NotChecked=0, Total=11772 [2021-12-07 00:01:57,574 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 109 states, 103 states have (on average 2.0679611650485437) internal successors, (213), 73 states have internal predecessors, (213), 36 states have call successors, (36), 36 states have call predecessors, (36), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:02:00,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:00,592 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2021-12-07 00:02:00,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-12-07 00:02:00,592 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 103 states have (on average 2.0679611650485437) internal successors, (213), 73 states have internal predecessors, (213), 36 states have call successors, (36), 36 states have call predecessors, (36), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2021-12-07 00:02:00,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:00,593 INFO L225 Difference]: With dead ends: 108 [2021-12-07 00:02:00,593 INFO L226 Difference]: Without dead ends: 108 [2021-12-07 00:02:00,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2835 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1385, Invalid=18075, Unknown=0, NotChecked=0, Total=19460 [2021-12-07 00:02:00,594 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 244 mSDsluCounter, 1242 mSDsCounter, 0 mSdLazyCounter, 3748 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 1282 SdHoareTripleChecker+Invalid, 3894 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 3748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 107 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:00,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [244 Valid, 1282 Invalid, 3894 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 3748 Invalid, 0 Unknown, 107 Unchecked, 1.2s Time] [2021-12-07 00:02:00,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-12-07 00:02:00,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2021-12-07 00:02:00,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 14 states have call successors, (14), 14 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:02:00,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2021-12-07 00:02:00,597 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 97 [2021-12-07 00:02:00,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:00,597 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2021-12-07 00:02:00,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 103 states have (on average 2.0679611650485437) internal successors, (213), 73 states have internal predecessors, (213), 36 states have call successors, (36), 36 states have call predecessors, (36), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:02:00,597 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2021-12-07 00:02:00,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-12-07 00:02:00,598 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:00,598 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:00,617 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-12-07 00:02:00,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-07 00:02:00,799 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:00,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:00,801 INFO L85 PathProgramCache]: Analyzing trace with hash -436125445, now seen corresponding path program 17 times [2021-12-07 00:02:00,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:00,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179960486] [2021-12-07 00:02:00,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:00,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:00,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:01,294 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 292 proven. 277 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:01,294 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:01,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179960486] [2021-12-07 00:02:01,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179960486] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:01,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815143205] [2021-12-07 00:02:01,294 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-07 00:02:01,294 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:01,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:01,295 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:01,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-07 00:02:01,412 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-12-07 00:02:01,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:02:01,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 98 conjunts are in the unsatisfiable core [2021-12-07 00:02:01,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:01,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:02:02,660 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:02,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:02:03,314 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 338 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:03,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1815143205] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:02:03,314 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:02:03,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 96 [2021-12-07 00:02:03,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996733875] [2021-12-07 00:02:03,315 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:02:03,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-12-07 00:02:03,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:02:03,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-12-07 00:02:03,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1173, Invalid=7947, Unknown=0, NotChecked=0, Total=9120 [2021-12-07 00:02:03,316 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 96 states, 95 states have (on average 2.3789473684210525) internal successors, (226), 69 states have internal predecessors, (226), 29 states have call successors, (29), 28 states have call predecessors, (29), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:02:03,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:03,772 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2021-12-07 00:02:03,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-12-07 00:02:03,772 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 2.3789473684210525) internal successors, (226), 69 states have internal predecessors, (226), 29 states have call successors, (29), 28 states have call predecessors, (29), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 105 [2021-12-07 00:02:03,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:03,773 INFO L225 Difference]: With dead ends: 165 [2021-12-07 00:02:03,773 INFO L226 Difference]: Without dead ends: 113 [2021-12-07 00:02:03,773 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3696 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1651, Invalid=10339, Unknown=0, NotChecked=0, Total=11990 [2021-12-07 00:02:03,774 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 132 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 782 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 782 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:03,774 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 293 Invalid, 787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 782 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-07 00:02:03,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-12-07 00:02:03,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 110. [2021-12-07 00:02:03,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 14 states have call successors, (14), 14 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:02:03,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2021-12-07 00:02:03,776 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 105 [2021-12-07 00:02:03,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:03,776 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2021-12-07 00:02:03,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 95 states have (on average 2.3789473684210525) internal successors, (226), 69 states have internal predecessors, (226), 29 states have call successors, (29), 28 states have call predecessors, (29), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:02:03,777 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2021-12-07 00:02:03,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-12-07 00:02:03,777 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:03,777 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:03,797 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-12-07 00:02:03,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-12-07 00:02:03,978 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:03,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:03,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1420552408, now seen corresponding path program 18 times [2021-12-07 00:02:03,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:03,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596404097] [2021-12-07 00:02:03,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:03,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:04,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:04,625 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:04,626 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:04,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596404097] [2021-12-07 00:02:04,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596404097] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:04,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104038868] [2021-12-07 00:02:04,626 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-07 00:02:04,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:04,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:04,627 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:04,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-07 00:02:04,813 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-12-07 00:02:04,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:02:04,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 140 conjunts are in the unsatisfiable core [2021-12-07 00:02:04,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:05,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:02:05,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:02:05,454 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:05,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:02:05,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:02:05,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:02:05,777 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 38 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:05,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104038868] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:02:05,778 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:02:05,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 68 [2021-12-07 00:02:05,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613127736] [2021-12-07 00:02:05,778 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:02:05,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-12-07 00:02:05,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:02:05,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-12-07 00:02:05,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=4382, Unknown=0, NotChecked=0, Total=4556 [2021-12-07 00:02:05,779 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand has 68 states, 65 states have (on average 2.4307692307692306) internal successors, (158), 53 states have internal predecessors, (158), 18 states have call successors, (18), 16 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:02:07,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:07,286 INFO L93 Difference]: Finished difference Result 170 states and 171 transitions. [2021-12-07 00:02:07,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-12-07 00:02:07,286 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 65 states have (on average 2.4307692307692306) internal successors, (158), 53 states have internal predecessors, (158), 18 states have call successors, (18), 16 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2021-12-07 00:02:07,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:07,287 INFO L225 Difference]: With dead ends: 170 [2021-12-07 00:02:07,287 INFO L226 Difference]: Without dead ends: 117 [2021-12-07 00:02:07,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 192 SyntacticMatches, 3 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 865 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=321, Invalid=8799, Unknown=0, NotChecked=0, Total=9120 [2021-12-07 00:02:07,288 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 78 mSDsluCounter, 1401 mSDsCounter, 0 mSdLazyCounter, 3775 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 1443 SdHoareTripleChecker+Invalid, 4026 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 3775 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 237 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:07,288 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 1443 Invalid, 4026 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 3775 Invalid, 0 Unknown, 237 Unchecked, 0.8s Time] [2021-12-07 00:02:07,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-12-07 00:02:07,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 114. [2021-12-07 00:02:07,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 14 states have call successors, (14), 14 states have call predecessors, (14), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:02:07,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2021-12-07 00:02:07,290 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 109 [2021-12-07 00:02:07,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:07,291 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2021-12-07 00:02:07,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 65 states have (on average 2.4307692307692306) internal successors, (158), 53 states have internal predecessors, (158), 18 states have call successors, (18), 16 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:02:07,291 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2021-12-07 00:02:07,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-12-07 00:02:07,291 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:07,291 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:07,311 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-12-07 00:02:07,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:07,492 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:07,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:07,494 INFO L85 PathProgramCache]: Analyzing trace with hash -1680516555, now seen corresponding path program 19 times [2021-12-07 00:02:07,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:07,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377199809] [2021-12-07 00:02:07,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:07,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:07,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:08,151 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 231 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:08,151 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:08,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377199809] [2021-12-07 00:02:08,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377199809] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:08,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475071051] [2021-12-07 00:02:08,152 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-07 00:02:08,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:08,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:08,152 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:08,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-07 00:02:08,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:08,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 129 conjunts are in the unsatisfiable core [2021-12-07 00:02:08,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:08,714 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 276 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:08,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:02:09,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-07 00:02:09,731 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 276 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:09,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475071051] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:02:09,731 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:02:09,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 45] total 92 [2021-12-07 00:02:09,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980004878] [2021-12-07 00:02:09,732 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:02:09,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-12-07 00:02:09,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:02:09,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-12-07 00:02:09,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=659, Invalid=7897, Unknown=0, NotChecked=0, Total=8556 [2021-12-07 00:02:09,733 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) [2021-12-07 00:02:10,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:10,802 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2021-12-07 00:02:10,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-12-07 00:02:10,803 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 [2021-12-07 00:02:10,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:10,804 INFO L225 Difference]: With dead ends: 120 [2021-12-07 00:02:10,804 INFO L226 Difference]: Without dead ends: 120 [2021-12-07 00:02:10,805 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3096 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=961, Invalid=10595, Unknown=0, NotChecked=0, Total=11556 [2021-12-07 00:02:10,805 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 242 mSDsluCounter, 1116 mSDsCounter, 0 mSdLazyCounter, 3305 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 1163 SdHoareTripleChecker+Invalid, 3329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 3305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:10,805 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 1163 Invalid, 3329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 3305 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-12-07 00:02:10,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-12-07 00:02:10,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2021-12-07 00:02:10,808 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) [2021-12-07 00:02:10,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2021-12-07 00:02:10,809 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 113 [2021-12-07 00:02:10,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:10,809 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2021-12-07 00:02:10,810 INFO L471 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) [2021-12-07 00:02:10,810 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2021-12-07 00:02:10,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-12-07 00:02:10,810 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:10,811 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:10,831 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-12-07 00:02:11,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-12-07 00:02:11,012 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:11,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:11,013 INFO L85 PathProgramCache]: Analyzing trace with hash -1602531044, now seen corresponding path program 20 times [2021-12-07 00:02:11,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:11,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363922889] [2021-12-07 00:02:11,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:11,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:11,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:11,765 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 41 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:11,765 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:11,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363922889] [2021-12-07 00:02:11,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363922889] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:11,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683437882] [2021-12-07 00:02:11,766 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:02:11,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:11,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:11,766 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:11,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-07 00:02:11,849 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:02:11,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:02:11,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 144 conjunts are in the unsatisfiable core [2021-12-07 00:02:11,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:12,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:02:15,376 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:02:15,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:02:15,678 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 276 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:15,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:02:18,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:02:18,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:02:18,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 27 [2021-12-07 00:02:18,749 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 276 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:18,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1683437882] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:02:18,750 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:02:18,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 49, 49] total 130 [2021-12-07 00:02:18,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304989660] [2021-12-07 00:02:18,750 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:02:18,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2021-12-07 00:02:18,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:02:18,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-12-07 00:02:18,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=727, Invalid=16043, Unknown=0, NotChecked=0, Total=16770 [2021-12-07 00:02:18,752 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) [2021-12-07 00:02:22,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:22,720 INFO L93 Difference]: Finished difference Result 188 states and 189 transitions. [2021-12-07 00:02:22,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-12-07 00:02:22,720 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 [2021-12-07 00:02:22,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:22,721 INFO L225 Difference]: With dead ends: 188 [2021-12-07 00:02:22,721 INFO L226 Difference]: Without dead ends: 131 [2021-12-07 00:02:22,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 175 SyntacticMatches, 3 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3799 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=1236, Invalid=26154, Unknown=0, NotChecked=0, Total=27390 [2021-12-07 00:02:22,723 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 122 mSDsluCounter, 1927 mSDsCounter, 0 mSdLazyCounter, 2761 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 1975 SdHoareTripleChecker+Invalid, 3984 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2761 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1205 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:22,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 1975 Invalid, 3984 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2761 Invalid, 0 Unknown, 1205 Unchecked, 0.8s Time] [2021-12-07 00:02:22,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-12-07 00:02:22,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 126. [2021-12-07 00:02:22,725 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) [2021-12-07 00:02:22,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2021-12-07 00:02:22,726 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 117 [2021-12-07 00:02:22,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:22,726 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2021-12-07 00:02:22,726 INFO L471 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) [2021-12-07 00:02:22,726 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2021-12-07 00:02:22,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-12-07 00:02:22,727 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:22,727 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:22,746 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-12-07 00:02:22,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:22,928 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:22,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:22,929 INFO L85 PathProgramCache]: Analyzing trace with hash -1357985184, now seen corresponding path program 21 times [2021-12-07 00:02:22,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:22,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973079537] [2021-12-07 00:02:22,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:22,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:22,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:23,783 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 44 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:23,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:23,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973079537] [2021-12-07 00:02:23,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973079537] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:23,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152493768] [2021-12-07 00:02:23,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:02:23,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:23,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:23,785 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:23,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-07 00:02:24,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-12-07 00:02:24,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:02:24,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 164 conjunts are in the unsatisfiable core [2021-12-07 00:02:24,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:24,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:02:24,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:02:24,843 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 44 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:24,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:02:25,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:02:25,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:02:25,213 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 44 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:25,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [152493768] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:02:25,213 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:02:25,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2021-12-07 00:02:25,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082782412] [2021-12-07 00:02:25,213 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:02:25,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-12-07 00:02:25,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:02:25,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-12-07 00:02:25,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=5508, Unknown=0, NotChecked=0, Total=5700 [2021-12-07 00:02:25,215 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) [2021-12-07 00:02:27,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:27,221 INFO L93 Difference]: Finished difference Result 194 states and 195 transitions. [2021-12-07 00:02:27,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-12-07 00:02:27,222 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 [2021-12-07 00:02:27,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:27,223 INFO L225 Difference]: With dead ends: 194 [2021-12-07 00:02:27,223 INFO L226 Difference]: Without dead ends: 133 [2021-12-07 00:02:27,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 222 SyntacticMatches, 3 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=357, Invalid=11199, Unknown=0, NotChecked=0, Total=11556 [2021-12-07 00:02:27,224 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 100 mSDsluCounter, 1793 mSDsCounter, 0 mSdLazyCounter, 4976 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 1841 SdHoareTripleChecker+Invalid, 5171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 4976 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 177 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:27,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 1841 Invalid, 5171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 4976 Invalid, 0 Unknown, 177 Unchecked, 1.1s Time] [2021-12-07 00:02:27,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-12-07 00:02:27,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 130. [2021-12-07 00:02:27,227 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) [2021-12-07 00:02:27,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2021-12-07 00:02:27,228 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 125 [2021-12-07 00:02:27,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:27,228 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2021-12-07 00:02:27,229 INFO L471 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) [2021-12-07 00:02:27,229 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2021-12-07 00:02:27,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-12-07 00:02:27,229 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:27,230 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:27,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-12-07 00:02:27,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:27,431 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:27,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:27,432 INFO L85 PathProgramCache]: Analyzing trace with hash -856956483, now seen corresponding path program 22 times [2021-12-07 00:02:27,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:27,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199897726] [2021-12-07 00:02:27,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:27,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:27,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:28,280 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 325 proven. 560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:28,281 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:28,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199897726] [2021-12-07 00:02:28,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199897726] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:28,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622653461] [2021-12-07 00:02:28,281 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 00:02:28,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:28,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:28,282 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:28,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-07 00:02:28,377 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 00:02:28,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:02:28,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 160 conjunts are in the unsatisfiable core [2021-12-07 00:02:28,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:28,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:02:28,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-07 00:02:30,344 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:02:30,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:02:30,579 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 392 proven. 493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:30,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:02:33,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:02:33,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:02:35,840 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 435 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:35,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622653461] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:02:35,840 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:02:35,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 53, 53] total 140 [2021-12-07 00:02:35,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374823445] [2021-12-07 00:02:35,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:02:35,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2021-12-07 00:02:35,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:02:35,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2021-12-07 00:02:35,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1283, Invalid=18457, Unknown=0, NotChecked=0, Total=19740 [2021-12-07 00:02:35,843 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 141 states, 135 states have (on average 2.0814814814814815) internal successors, (281), 93 states have internal predecessors, (281), 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) [2021-12-07 00:02:40,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:40,509 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2021-12-07 00:02:40,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-12-07 00:02:40,509 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 135 states have (on average 2.0814814814814815) internal successors, (281), 93 states have internal predecessors, (281), 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 [2021-12-07 00:02:40,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:40,510 INFO L225 Difference]: With dead ends: 140 [2021-12-07 00:02:40,510 INFO L226 Difference]: Without dead ends: 140 [2021-12-07 00:02:40,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4761 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=2133, Invalid=30087, Unknown=0, NotChecked=0, Total=32220 [2021-12-07 00:02:40,512 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 456 mSDsluCounter, 1857 mSDsCounter, 0 mSdLazyCounter, 5570 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 456 SdHoareTripleChecker+Valid, 1909 SdHoareTripleChecker+Invalid, 5783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 5570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 167 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:40,512 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [456 Valid, 1909 Invalid, 5783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 5570 Invalid, 0 Unknown, 167 Unchecked, 1.7s Time] [2021-12-07 00:02:40,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-12-07 00:02:40,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 138. [2021-12-07 00:02:40,514 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) [2021-12-07 00:02:40,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2021-12-07 00:02:40,515 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 129 [2021-12-07 00:02:40,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:40,515 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2021-12-07 00:02:40,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 135 states have (on average 2.0814814814814815) internal successors, (281), 93 states have internal predecessors, (281), 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) [2021-12-07 00:02:40,515 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2021-12-07 00:02:40,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-12-07 00:02:40,516 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:40,516 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:40,535 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-12-07 00:02:40,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-12-07 00:02:40,717 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:40,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:40,718 INFO L85 PathProgramCache]: Analyzing trace with hash -135791605, now seen corresponding path program 23 times [2021-12-07 00:02:40,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:40,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375950762] [2021-12-07 00:02:40,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:40,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:40,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:41,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 516 proven. 497 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:41,497 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:41,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375950762] [2021-12-07 00:02:41,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375950762] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:41,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779840782] [2021-12-07 00:02:41,497 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-07 00:02:41,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:41,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:41,498 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:41,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-07 00:02:41,697 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-12-07 00:02:41,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:02:41,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 126 conjunts are in the unsatisfiable core [2021-12-07 00:02:41,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:41,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:02:43,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 578 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:43,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:02:44,514 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 578 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:44,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779840782] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:02:44,515 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:02:44,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 124 [2021-12-07 00:02:44,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094869749] [2021-12-07 00:02:44,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:02:44,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2021-12-07 00:02:44,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:02:44,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2021-12-07 00:02:44,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1937, Invalid=13315, Unknown=0, NotChecked=0, Total=15252 [2021-12-07 00:02:44,517 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) [2021-12-07 00:02:45,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:45,217 INFO L93 Difference]: Finished difference Result 213 states and 214 transitions. [2021-12-07 00:02:45,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-12-07 00:02:45,217 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 [2021-12-07 00:02:45,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:45,218 INFO L225 Difference]: With dead ends: 213 [2021-12-07 00:02:45,218 INFO L226 Difference]: Without dead ends: 145 [2021-12-07 00:02:45,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 203 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6336 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2729, Invalid=17293, Unknown=0, NotChecked=0, Total=20022 [2021-12-07 00:02:45,220 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 170 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 1327 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 458 SdHoareTripleChecker+Invalid, 1337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:45,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 458 Invalid, 1337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1327 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-07 00:02:45,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-12-07 00:02:45,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 142. [2021-12-07 00:02:45,222 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) [2021-12-07 00:02:45,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2021-12-07 00:02:45,222 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 137 [2021-12-07 00:02:45,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:45,222 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2021-12-07 00:02:45,223 INFO L471 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) [2021-12-07 00:02:45,223 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2021-12-07 00:02:45,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-12-07 00:02:45,223 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:45,223 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:45,243 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-12-07 00:02:45,424 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:45,425 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:45,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:45,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1653346328, now seen corresponding path program 24 times [2021-12-07 00:02:45,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:45,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117619803] [2021-12-07 00:02:45,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:45,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:45,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:46,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 50 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:46,503 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:46,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117619803] [2021-12-07 00:02:46,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117619803] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:46,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569501458] [2021-12-07 00:02:46,503 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-07 00:02:46,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:46,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:46,504 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:46,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-07 00:02:46,978 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2021-12-07 00:02:46,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:02:46,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 180 conjunts are in the unsatisfiable core [2021-12-07 00:02:46,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:47,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:02:47,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:02:47,967 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 50 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:47,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:02:48,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:02:48,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:02:48,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 50 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:48,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569501458] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:02:48,357 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:02:48,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 84 [2021-12-07 00:02:48,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063976545] [2021-12-07 00:02:48,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:02:48,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-12-07 00:02:48,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:02:48,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-12-07 00:02:48,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=6762, Unknown=0, NotChecked=0, Total=6972 [2021-12-07 00:02:48,359 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) [2021-12-07 00:02:51,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:51,029 INFO L93 Difference]: Finished difference Result 218 states and 219 transitions. [2021-12-07 00:02:51,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-12-07 00:02:51,030 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 [2021-12-07 00:02:51,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:51,030 INFO L225 Difference]: With dead ends: 218 [2021-12-07 00:02:51,030 INFO L226 Difference]: Without dead ends: 149 [2021-12-07 00:02:51,031 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 252 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=393, Invalid=13887, Unknown=0, NotChecked=0, Total=14280 [2021-12-07 00:02:51,031 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 112 mSDsluCounter, 2253 mSDsCounter, 0 mSdLazyCounter, 6427 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 2307 SdHoareTripleChecker+Invalid, 6553 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 6427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:51,032 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 2307 Invalid, 6553 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 6427 Invalid, 0 Unknown, 106 Unchecked, 1.5s Time] [2021-12-07 00:02:51,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-12-07 00:02:51,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 146. [2021-12-07 00:02:51,034 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) [2021-12-07 00:02:51,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2021-12-07 00:02:51,034 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 141 [2021-12-07 00:02:51,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:51,035 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2021-12-07 00:02:51,035 INFO L471 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) [2021-12-07 00:02:51,035 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2021-12-07 00:02:51,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-12-07 00:02:51,035 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:51,035 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:51,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-12-07 00:02:51,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:51,237 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:51,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:51,238 INFO L85 PathProgramCache]: Analyzing trace with hash -235360955, now seen corresponding path program 25 times [2021-12-07 00:02:51,238 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:51,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480100922] [2021-12-07 00:02:51,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:51,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:51,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:52,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 435 proven. 704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:52,179 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:52,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480100922] [2021-12-07 00:02:52,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [480100922] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:52,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760107964] [2021-12-07 00:02:52,180 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-07 00:02:52,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:52,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:52,181 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:52,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-12-07 00:02:52,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:52,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 165 conjunts are in the unsatisfiable core [2021-12-07 00:02:52,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:53,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 496 proven. 643 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:53,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:02:54,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-07 00:02:54,646 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 496 proven. 643 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:54,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760107964] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:02:54,647 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:02:54,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 57, 57] total 116 [2021-12-07 00:02:54,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382614661] [2021-12-07 00:02:54,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:02:54,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2021-12-07 00:02:54,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:02:54,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-12-07 00:02:54,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=12555, Unknown=0, NotChecked=0, Total=13572 [2021-12-07 00:02:54,649 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) [2021-12-07 00:02:56,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:02:56,465 INFO L93 Difference]: Finished difference Result 152 states and 153 transitions. [2021-12-07 00:02:56,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-12-07 00:02:56,466 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 [2021-12-07 00:02:56,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:02:56,466 INFO L225 Difference]: With dead ends: 152 [2021-12-07 00:02:56,466 INFO L226 Difference]: Without dead ends: 152 [2021-12-07 00:02:56,467 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 227 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5030 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1475, Invalid=16885, Unknown=0, NotChecked=0, Total=18360 [2021-12-07 00:02:56,468 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 381 mSDsluCounter, 1776 mSDsCounter, 0 mSdLazyCounter, 5299 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 381 SdHoareTripleChecker+Valid, 1835 SdHoareTripleChecker+Invalid, 5325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 5299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-12-07 00:02:56,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [381 Valid, 1835 Invalid, 5325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 5299 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-12-07 00:02:56,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-12-07 00:02:56,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2021-12-07 00:02:56,470 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) [2021-12-07 00:02:56,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2021-12-07 00:02:56,471 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 145 [2021-12-07 00:02:56,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:02:56,471 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2021-12-07 00:02:56,471 INFO L471 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) [2021-12-07 00:02:56,471 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2021-12-07 00:02:56,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-12-07 00:02:56,472 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:02:56,472 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:02:56,494 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-12-07 00:02:56,672 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-12-07 00:02:56,673 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:02:56,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:02:56,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1080124372, now seen corresponding path program 26 times [2021-12-07 00:02:56,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:02:56,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59123624] [2021-12-07 00:02:56,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:02:56,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:02:56,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:02:57,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 53 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:02:57,776 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:02:57,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59123624] [2021-12-07 00:02:57,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59123624] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:02:57,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355724636] [2021-12-07 00:02:57,776 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:02:57,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:02:57,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:02:57,777 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:02:57,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-12-07 00:02:57,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:02:57,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:02:57,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 595 conjuncts, 180 conjunts are in the unsatisfiable core [2021-12-07 00:02:57,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:02:58,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:03:02,888 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:03:02,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:03:03,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 496 proven. 713 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:03,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:03:07,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:03:07,749 INFO L388 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 15 treesize of output 11 [2021-12-07 00:03:07,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:03:07,841 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 496 proven. 713 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:07,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355724636] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:03:07,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:03:07,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 61, 61] total 162 [2021-12-07 00:03:07,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963830182] [2021-12-07 00:03:07,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:03:07,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 162 states [2021-12-07 00:03:07,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:03:07,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2021-12-07 00:03:07,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1063, Invalid=25019, Unknown=0, NotChecked=0, Total=26082 [2021-12-07 00:03:07,843 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) [2021-12-07 00:03:15,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:03:15,023 INFO L93 Difference]: Finished difference Result 236 states and 237 transitions. [2021-12-07 00:03:15,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-12-07 00:03:15,023 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 [2021-12-07 00:03:15,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:03:15,024 INFO L225 Difference]: With dead ends: 236 [2021-12-07 00:03:15,024 INFO L226 Difference]: Without dead ends: 163 [2021-12-07 00:03:15,026 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 227 SyntacticMatches, 3 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5909 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=1776, Invalid=40454, Unknown=0, NotChecked=0, Total=42230 [2021-12-07 00:03:15,026 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 145 mSDsluCounter, 3104 mSDsCounter, 0 mSdLazyCounter, 4540 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 3164 SdHoareTripleChecker+Invalid, 6288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 4540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1725 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:03:15,027 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 3164 Invalid, 6288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 4540 Invalid, 0 Unknown, 1725 Unchecked, 1.2s Time] [2021-12-07 00:03:15,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-12-07 00:03:15,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 158. [2021-12-07 00:03:15,029 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) [2021-12-07 00:03:15,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2021-12-07 00:03:15,029 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 149 [2021-12-07 00:03:15,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:03:15,030 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2021-12-07 00:03:15,030 INFO L471 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) [2021-12-07 00:03:15,030 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2021-12-07 00:03:15,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-12-07 00:03:15,030 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:03:15,030 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:03:15,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-12-07 00:03:15,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-12-07 00:03:15,232 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:03:15,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:03:15,233 INFO L85 PathProgramCache]: Analyzing trace with hash 1765759344, now seen corresponding path program 27 times [2021-12-07 00:03:15,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:03:15,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465549550] [2021-12-07 00:03:15,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:03:15,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:03:15,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:03:16,479 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 56 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:16,480 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:03:16,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465549550] [2021-12-07 00:03:16,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465549550] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:03:16,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361505046] [2021-12-07 00:03:16,480 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:03:16,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:03:16,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:03:16,481 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:03:16,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-12-07 00:03:17,236 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-12-07 00:03:17,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:03:17,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 200 conjunts are in the unsatisfiable core [2021-12-07 00:03:17,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:03:17,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:03:18,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:03:18,369 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 56 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:18,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:03:18,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:03:18,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:03:18,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 56 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:18,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361505046] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:03:18,853 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:03:18,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 92 [2021-12-07 00:03:18,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613483778] [2021-12-07 00:03:18,854 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:03:18,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-12-07 00:03:18,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:03:18,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-12-07 00:03:18,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=8144, Unknown=0, NotChecked=0, Total=8372 [2021-12-07 00:03:18,855 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) [2021-12-07 00:03:22,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:03:22,047 INFO L93 Difference]: Finished difference Result 242 states and 243 transitions. [2021-12-07 00:03:22,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-12-07 00:03:22,047 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 [2021-12-07 00:03:22,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:03:22,048 INFO L225 Difference]: With dead ends: 242 [2021-12-07 00:03:22,048 INFO L226 Difference]: Without dead ends: 165 [2021-12-07 00:03:22,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 282 SyntacticMatches, 3 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1510 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=429, Invalid=16863, Unknown=0, NotChecked=0, Total=17292 [2021-12-07 00:03:22,050 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 108 mSDsluCounter, 2959 mSDsCounter, 0 mSdLazyCounter, 8349 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 3019 SdHoareTripleChecker+Invalid, 8562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 8349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 193 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-12-07 00:03:22,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 3019 Invalid, 8562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 8349 Invalid, 0 Unknown, 193 Unchecked, 1.8s Time] [2021-12-07 00:03:22,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-12-07 00:03:22,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 162. [2021-12-07 00:03:22,053 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) [2021-12-07 00:03:22,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2021-12-07 00:03:22,054 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 157 [2021-12-07 00:03:22,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:03:22,054 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2021-12-07 00:03:22,055 INFO L471 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) [2021-12-07 00:03:22,055 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2021-12-07 00:03:22,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-12-07 00:03:22,056 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:03:22,056 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:03:22,076 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-12-07 00:03:22,256 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-12-07 00:03:22,256 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:03:22,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:03:22,257 INFO L85 PathProgramCache]: Analyzing trace with hash -329270067, now seen corresponding path program 28 times [2021-12-07 00:03:22,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:03:22,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702894345] [2021-12-07 00:03:22,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:03:22,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:03:22,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:03:23,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 561 proven. 864 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:23,440 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:03:23,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702894345] [2021-12-07 00:03:23,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702894345] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:03:23,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979136228] [2021-12-07 00:03:23,440 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 00:03:23,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:03:23,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:03:23,441 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:03:23,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-12-07 00:03:23,540 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 00:03:23,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:03:23,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 196 conjunts are in the unsatisfiable core [2021-12-07 00:03:23,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:03:23,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:03:24,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-07 00:03:27,853 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:03:27,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:03:28,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 648 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:28,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:03:32,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:03:32,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:03:36,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 703 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:36,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979136228] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:03:36,727 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:03:36,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 65, 65] total 189 [2021-12-07 00:03:36,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913002821] [2021-12-07 00:03:36,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:03:36,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2021-12-07 00:03:36,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:03:36,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2021-12-07 00:03:36,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2206, Invalid=33704, Unknown=0, NotChecked=0, Total=35910 [2021-12-07 00:03:36,730 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) [2021-12-07 00:03:44,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:03:44,196 INFO L93 Difference]: Finished difference Result 172 states and 173 transitions. [2021-12-07 00:03:44,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-12-07 00:03:44,197 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 [2021-12-07 00:03:44,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:03:44,198 INFO L225 Difference]: With dead ends: 172 [2021-12-07 00:03:44,198 INFO L226 Difference]: Without dead ends: 172 [2021-12-07 00:03:44,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9786 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=3448, Invalid=52958, Unknown=0, NotChecked=0, Total=56406 [2021-12-07 00:03:44,203 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 623 mSDsluCounter, 2680 mSDsCounter, 0 mSdLazyCounter, 7940 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 623 SdHoareTripleChecker+Valid, 2744 SdHoareTripleChecker+Invalid, 8157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 7940 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-12-07 00:03:44,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [623 Valid, 2744 Invalid, 8157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 7940 Invalid, 0 Unknown, 147 Unchecked, 2.6s Time] [2021-12-07 00:03:44,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-12-07 00:03:44,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 170. [2021-12-07 00:03:44,207 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) [2021-12-07 00:03:44,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2021-12-07 00:03:44,208 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 161 [2021-12-07 00:03:44,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:03:44,208 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2021-12-07 00:03:44,208 INFO L471 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) [2021-12-07 00:03:44,208 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2021-12-07 00:03:44,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-12-07 00:03:44,209 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:03:44,209 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:03:44,229 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-12-07 00:03:44,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-12-07 00:03:44,411 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:03:44,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:03:44,412 INFO L85 PathProgramCache]: Analyzing trace with hash -1013463269, now seen corresponding path program 29 times [2021-12-07 00:03:44,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:03:44,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827317774] [2021-12-07 00:03:44,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:03:44,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:03:44,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:03:45,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1585 backedges. 804 proven. 781 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:45,500 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:03:45,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827317774] [2021-12-07 00:03:45,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827317774] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:03:45,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93205573] [2021-12-07 00:03:45,500 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-07 00:03:45,500 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:03:45,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:03:45,501 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:03:45,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-12-07 00:03:45,809 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2021-12-07 00:03:45,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:03:45,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 154 conjunts are in the unsatisfiable core [2021-12-07 00:03:45,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:03:45,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:03:48,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1585 backedges. 882 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:48,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:03:50,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1585 backedges. 882 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:50,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93205573] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:03:50,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:03:50,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65, 65] total 152 [2021-12-07 00:03:50,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437164005] [2021-12-07 00:03:50,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:03:50,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2021-12-07 00:03:50,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:03:50,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-12-07 00:03:50,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2893, Invalid=20059, Unknown=0, NotChecked=0, Total=22952 [2021-12-07 00:03:50,075 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) [2021-12-07 00:03:51,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:03:51,065 INFO L93 Difference]: Finished difference Result 261 states and 262 transitions. [2021-12-07 00:03:51,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-12-07 00:03:51,066 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 [2021-12-07 00:03:51,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:03:51,067 INFO L225 Difference]: With dead ends: 261 [2021-12-07 00:03:51,067 INFO L226 Difference]: Without dead ends: 177 [2021-12-07 00:03:51,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 251 SyntacticMatches, 1 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9680 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=4079, Invalid=26023, Unknown=0, NotChecked=0, Total=30102 [2021-12-07 00:03:51,068 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 226 mSDsluCounter, 393 mSDsCounter, 0 mSdLazyCounter, 1236 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 1253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-07 00:03:51,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 440 Invalid, 1253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1236 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-07 00:03:51,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-12-07 00:03:51,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 174. [2021-12-07 00:03:51,071 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) [2021-12-07 00:03:51,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2021-12-07 00:03:51,071 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 169 [2021-12-07 00:03:51,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:03:51,071 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2021-12-07 00:03:51,072 INFO L471 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) [2021-12-07 00:03:51,072 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2021-12-07 00:03:51,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-12-07 00:03:51,072 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:03:51,072 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:03:51,104 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-12-07 00:03:51,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-12-07 00:03:51,274 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:03:51,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:03:51,275 INFO L85 PathProgramCache]: Analyzing trace with hash -405469448, now seen corresponding path program 30 times [2021-12-07 00:03:51,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:03:51,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794243191] [2021-12-07 00:03:51,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:03:51,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:03:51,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:03:52,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1662 backedges. 62 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:52,783 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:03:52,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794243191] [2021-12-07 00:03:52,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794243191] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:03:52,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [996207577] [2021-12-07 00:03:52,783 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-07 00:03:52,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:03:52,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:03:52,784 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:03:52,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-12-07 00:03:53,758 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2021-12-07 00:03:53,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:03:53,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 220 conjunts are in the unsatisfiable core [2021-12-07 00:03:53,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:03:54,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:03:55,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:03:55,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1662 backedges. 62 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:55,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:03:55,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:03:55,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:03:55,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1662 backedges. 62 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:03:55,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [996207577] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:03:55,541 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:03:55,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 100 [2021-12-07 00:03:55,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178929304] [2021-12-07 00:03:55,542 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:03:55,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-12-07 00:03:55,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:03:55,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-12-07 00:03:55,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=9654, Unknown=0, NotChecked=0, Total=9900 [2021-12-07 00:03:55,543 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) [2021-12-07 00:03:59,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:03:59,621 INFO L93 Difference]: Finished difference Result 266 states and 267 transitions. [2021-12-07 00:03:59,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-12-07 00:03:59,621 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 [2021-12-07 00:03:59,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:03:59,622 INFO L225 Difference]: With dead ends: 266 [2021-12-07 00:03:59,622 INFO L226 Difference]: Without dead ends: 181 [2021-12-07 00:03:59,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 312 SyntacticMatches, 3 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1765 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=465, Invalid=20127, Unknown=0, NotChecked=0, Total=20592 [2021-12-07 00:03:59,623 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 117 mSDsluCounter, 3664 mSDsCounter, 0 mSdLazyCounter, 10570 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 3730 SdHoareTripleChecker+Invalid, 10722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 10570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 130 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-12-07 00:03:59,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 3730 Invalid, 10722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 10570 Invalid, 0 Unknown, 130 Unchecked, 2.4s Time] [2021-12-07 00:03:59,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-12-07 00:03:59,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 178. [2021-12-07 00:03:59,625 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) [2021-12-07 00:03:59,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2021-12-07 00:03:59,626 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 173 [2021-12-07 00:03:59,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:03:59,626 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2021-12-07 00:03:59,626 INFO L471 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) [2021-12-07 00:03:59,626 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2021-12-07 00:03:59,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-12-07 00:03:59,627 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:03:59,627 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:03:59,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-12-07 00:03:59,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-12-07 00:03:59,828 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:03:59,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:03:59,828 INFO L85 PathProgramCache]: Analyzing trace with hash 696586325, now seen corresponding path program 31 times [2021-12-07 00:03:59,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:03:59,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878231472] [2021-12-07 00:03:59,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:03:59,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:03:59,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:04:01,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 703 proven. 1040 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:01,426 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:04:01,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878231472] [2021-12-07 00:04:01,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878231472] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:04:01,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908688063] [2021-12-07 00:04:01,426 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-07 00:04:01,426 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:04:01,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:04:01,427 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:04:01,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-12-07 00:04:01,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:04:01,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 201 conjunts are in the unsatisfiable core [2021-12-07 00:04:01,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:04:02,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 780 proven. 963 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:02,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:04:05,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-07 00:04:05,537 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 780 proven. 963 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:05,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908688063] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:04:05,537 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:04:05,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 69, 69] total 139 [2021-12-07 00:04:05,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303484554] [2021-12-07 00:04:05,537 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:04:05,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2021-12-07 00:04:05,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:04:05,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2021-12-07 00:04:05,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1219, Invalid=18241, Unknown=0, NotChecked=0, Total=19460 [2021-12-07 00:04:05,539 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) [2021-12-07 00:04:09,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:04:09,255 INFO L93 Difference]: Finished difference Result 184 states and 185 transitions. [2021-12-07 00:04:09,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-12-07 00:04:09,256 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 137 states have (on average 2.27007299270073) internal successors, (311), 95 states have internal predecessors, (311), 46 states have call successors, (46), 45 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 177 [2021-12-07 00:04:09,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:04:09,257 INFO L225 Difference]: With dead ends: 184 [2021-12-07 00:04:09,257 INFO L226 Difference]: Without dead ends: 184 [2021-12-07 00:04:09,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 279 SyntacticMatches, 2 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6609 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=2554, Invalid=30752, Unknown=0, NotChecked=0, Total=33306 [2021-12-07 00:04:09,258 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 477 mSDsluCounter, 2651 mSDsCounter, 0 mSdLazyCounter, 7957 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 477 SdHoareTripleChecker+Valid, 2722 SdHoareTripleChecker+Invalid, 7985 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 7957 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-12-07 00:04:09,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [477 Valid, 2722 Invalid, 7985 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 7957 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-12-07 00:04:09,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-12-07 00:04:09,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 182. [2021-12-07 00:04:09,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 158 states have (on average 1.0126582278481013) internal successors, (160), 158 states have internal predecessors, (160), 23 states have call successors, (23), 23 states have call predecessors, (23), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:04:09,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2021-12-07 00:04:09,261 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 177 [2021-12-07 00:04:09,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:04:09,262 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2021-12-07 00:04:09,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 137 states have (on average 2.27007299270073) internal successors, (311), 95 states have internal predecessors, (311), 46 states have call successors, (46), 45 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:04:09,262 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2021-12-07 00:04:09,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-12-07 00:04:09,263 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:04:09,263 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:04:09,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-12-07 00:04:09,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-12-07 00:04:09,464 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:04:09,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:04:09,465 INFO L85 PathProgramCache]: Analyzing trace with hash -987564228, now seen corresponding path program 32 times [2021-12-07 00:04:09,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:04:09,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457749885] [2021-12-07 00:04:09,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:04:09,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:04:09,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:04:11,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1829 backedges. 65 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:11,131 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:04:11,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457749885] [2021-12-07 00:04:11,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457749885] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:04:11,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935794389] [2021-12-07 00:04:11,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:04:11,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:04:11,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:04:11,132 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:04:11,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-12-07 00:04:11,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:04:11,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:04:11,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 719 conjuncts, 216 conjunts are in the unsatisfiable core [2021-12-07 00:04:11,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:04:12,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:04:18,782 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:04:18,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:04:19,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1829 backedges. 780 proven. 1049 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:19,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:04:25,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:04:25,917 INFO L388 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 15 treesize of output 11 [2021-12-07 00:04:25,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:04:26,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1829 backedges. 780 proven. 1049 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:26,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [935794389] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:04:26,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:04:26,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 73, 73] total 194 [2021-12-07 00:04:26,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165332744] [2021-12-07 00:04:26,058 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:04:26,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 194 states [2021-12-07 00:04:26,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:04:26,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2021-12-07 00:04:26,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1463, Invalid=35979, Unknown=0, NotChecked=0, Total=37442 [2021-12-07 00:04:26,061 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand has 194 states, 189 states have (on average 2.0211640211640214) internal successors, (382), 126 states have internal predecessors, (382), 69 states have call successors, (69), 69 states have call predecessors, (69), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:04:37,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:04:37,398 INFO L93 Difference]: Finished difference Result 284 states and 285 transitions. [2021-12-07 00:04:37,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-12-07 00:04:37,398 INFO L78 Accepts]: Start accepts. Automaton has has 194 states, 189 states have (on average 2.0211640211640214) internal successors, (382), 126 states have internal predecessors, (382), 69 states have call successors, (69), 69 states have call predecessors, (69), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 181 [2021-12-07 00:04:37,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:04:37,399 INFO L225 Difference]: With dead ends: 284 [2021-12-07 00:04:37,399 INFO L226 Difference]: Without dead ends: 195 [2021-12-07 00:04:37,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 279 SyntacticMatches, 3 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8484 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=2412, Invalid=57858, Unknown=0, NotChecked=0, Total=60270 [2021-12-07 00:04:37,402 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 169 mSDsluCounter, 4399 mSDsCounter, 0 mSdLazyCounter, 6093 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 4471 SdHoareTripleChecker+Invalid, 8276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 6093 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2155 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-12-07 00:04:37,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 4471 Invalid, 8276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 6093 Invalid, 0 Unknown, 2155 Unchecked, 1.9s Time] [2021-12-07 00:04:37,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-12-07 00:04:37,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 190. [2021-12-07 00:04:37,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 165 states have (on average 1.0121212121212122) internal successors, (167), 165 states have internal predecessors, (167), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:04:37,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2021-12-07 00:04:37,405 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 181 [2021-12-07 00:04:37,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:04:37,405 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2021-12-07 00:04:37,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 194 states, 189 states have (on average 2.0211640211640214) internal successors, (382), 126 states have internal predecessors, (382), 69 states have call successors, (69), 69 states have call predecessors, (69), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:04:37,405 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2021-12-07 00:04:37,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-12-07 00:04:37,406 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:04:37,406 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:04:37,439 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-12-07 00:04:37,607 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:04:37,607 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:04:37,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:04:37,608 INFO L85 PathProgramCache]: Analyzing trace with hash 2056845440, now seen corresponding path program 33 times [2021-12-07 00:04:37,608 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:04:37,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901619191] [2021-12-07 00:04:37,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:04:37,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:04:37,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:04:39,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2004 backedges. 68 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:39,462 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:04:39,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901619191] [2021-12-07 00:04:39,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901619191] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:04:39,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072841320] [2021-12-07 00:04:39,462 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:04:39,462 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:04:39,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:04:39,463 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:04:39,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-12-07 00:04:40,412 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-12-07 00:04:40,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:04:40,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 240 conjunts are in the unsatisfiable core [2021-12-07 00:04:40,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:04:41,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-07 00:04:42,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:04:42,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2004 backedges. 68 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:42,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:04:42,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:04:42,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:04:42,710 INFO L134 CoverageAnalysis]: Checked inductivity of 2004 backedges. 68 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:42,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072841320] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:04:42,710 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:04:42,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 108 [2021-12-07 00:04:42,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260574945] [2021-12-07 00:04:42,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:04:42,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2021-12-07 00:04:42,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:04:42,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-12-07 00:04:42,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=11292, Unknown=0, NotChecked=0, Total=11556 [2021-12-07 00:04:42,712 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand has 108 states, 105 states have (on average 2.552380952380952) internal successors, (268), 83 states have internal predecessors, (268), 28 states have call successors, (28), 26 states have call predecessors, (28), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:04:47,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:04:47,604 INFO L93 Difference]: Finished difference Result 290 states and 291 transitions. [2021-12-07 00:04:47,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-12-07 00:04:47,605 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 105 states have (on average 2.552380952380952) internal successors, (268), 83 states have internal predecessors, (268), 28 states have call successors, (28), 26 states have call predecessors, (28), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 189 [2021-12-07 00:04:47,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:04:47,606 INFO L225 Difference]: With dead ends: 290 [2021-12-07 00:04:47,606 INFO L226 Difference]: Without dead ends: 197 [2021-12-07 00:04:47,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 342 SyntacticMatches, 3 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2040 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=501, Invalid=23679, Unknown=0, NotChecked=0, Total=24180 [2021-12-07 00:04:47,607 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 131 mSDsluCounter, 4133 mSDsCounter, 0 mSdLazyCounter, 11685 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 4205 SdHoareTripleChecker+Invalid, 12070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 11685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 360 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-12-07 00:04:47,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 4205 Invalid, 12070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 11685 Invalid, 0 Unknown, 360 Unchecked, 2.8s Time] [2021-12-07 00:04:47,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-12-07 00:04:47,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 194. [2021-12-07 00:04:47,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 169 states have (on average 1.0118343195266273) internal successors, (171), 169 states have internal predecessors, (171), 24 states have call successors, (24), 24 states have call predecessors, (24), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:04:47,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 195 transitions. [2021-12-07 00:04:47,610 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 195 transitions. Word has length 189 [2021-12-07 00:04:47,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:04:47,610 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 195 transitions. [2021-12-07 00:04:47,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 105 states have (on average 2.552380952380952) internal successors, (268), 83 states have internal predecessors, (268), 28 states have call successors, (28), 26 states have call predecessors, (28), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:04:47,610 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 195 transitions. [2021-12-07 00:04:47,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-12-07 00:04:47,611 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:04:47,611 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:04:47,631 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-12-07 00:04:47,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:04:47,812 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:04:47,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:04:47,813 INFO L85 PathProgramCache]: Analyzing trace with hash -1563645987, now seen corresponding path program 34 times [2021-12-07 00:04:47,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:04:47,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294431688] [2021-12-07 00:04:47,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:04:47,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:04:47,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:04:49,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2093 backedges. 861 proven. 1232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:49,560 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:04:49,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294431688] [2021-12-07 00:04:49,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294431688] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:04:49,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916225390] [2021-12-07 00:04:49,560 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 00:04:49,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:04:49,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:04:49,561 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:04:49,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-12-07 00:04:49,698 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 00:04:49,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:04:49,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 692 conjuncts, 232 conjunts are in the unsatisfiable core [2021-12-07 00:04:49,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:04:49,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:04:50,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-07 00:04:54,216 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:04:54,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:04:54,599 INFO L134 CoverageAnalysis]: Checked inductivity of 2093 backedges. 968 proven. 1125 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:04:54,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:05:00,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-07 00:05:00,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-12-07 00:05:05,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2093 backedges. 1035 proven. 1058 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:05:05,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916225390] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:05:05,738 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:05:05,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 77, 77] total 204 [2021-12-07 00:05:05,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990337478] [2021-12-07 00:05:05,739 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:05:05,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 205 states [2021-12-07 00:05:05,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:05:05,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2021-12-07 00:05:05,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2575, Invalid=39245, Unknown=0, NotChecked=0, Total=41820 [2021-12-07 00:05:05,742 INFO L87 Difference]: Start difference. First operand 194 states and 195 transitions. Second operand has 205 states, 199 states have (on average 2.0954773869346734) internal successors, (417), 133 states have internal predecessors, (417), 72 states have call successors, (72), 72 states have call predecessors, (72), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:05:16,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:05:16,290 INFO L93 Difference]: Finished difference Result 204 states and 205 transitions. [2021-12-07 00:05:16,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-12-07 00:05:16,290 INFO L78 Accepts]: Start accepts. Automaton has has 205 states, 199 states have (on average 2.0954773869346734) internal successors, (417), 133 states have internal predecessors, (417), 72 states have call successors, (72), 72 states have call predecessors, (72), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 193 [2021-12-07 00:05:16,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:05:16,291 INFO L225 Difference]: With dead ends: 204 [2021-12-07 00:05:16,291 INFO L226 Difference]: Without dead ends: 204 [2021-12-07 00:05:16,294 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 255 SyntacticMatches, 0 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10101 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=4109, Invalid=63231, Unknown=0, NotChecked=0, Total=67340 [2021-12-07 00:05:16,294 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 849 mSDsluCounter, 3691 mSDsCounter, 0 mSdLazyCounter, 10866 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 849 SdHoareTripleChecker+Valid, 3767 SdHoareTripleChecker+Invalid, 11221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 10866 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 292 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-12-07 00:05:16,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [849 Valid, 3767 Invalid, 11221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 10866 Invalid, 0 Unknown, 292 Unchecked, 3.7s Time] [2021-12-07 00:05:16,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-12-07 00:05:16,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 202. [2021-12-07 00:05:16,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 175 states have (on average 1.0114285714285713) internal successors, (177), 175 states have internal predecessors, (177), 26 states have call successors, (26), 26 states have call predecessors, (26), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:05:16,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2021-12-07 00:05:16,297 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 193 [2021-12-07 00:05:16,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:05:16,298 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2021-12-07 00:05:16,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 205 states, 199 states have (on average 2.0954773869346734) internal successors, (417), 133 states have internal predecessors, (417), 72 states have call successors, (72), 72 states have call predecessors, (72), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:05:16,298 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2021-12-07 00:05:16,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-12-07 00:05:16,299 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:05:16,299 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:05:16,319 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2021-12-07 00:05:16,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-12-07 00:05:16,500 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:05:16,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:05:16,501 INFO L85 PathProgramCache]: Analyzing trace with hash 1680908843, now seen corresponding path program 35 times [2021-12-07 00:05:16,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:05:16,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296213586] [2021-12-07 00:05:16,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:05:16,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:05:16,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:05:18,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2285 backedges. 1156 proven. 1129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:05:18,019 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:05:18,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296213586] [2021-12-07 00:05:18,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296213586] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:05:18,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023138449] [2021-12-07 00:05:18,019 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-07 00:05:18,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:05:18,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:05:18,020 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:05:18,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-12-07 00:05:18,617 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 26 check-sat command(s) [2021-12-07 00:05:18,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:05:18,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 182 conjunts are in the unsatisfiable core [2021-12-07 00:05:18,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:05:18,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:05:22,670 INFO L134 CoverageAnalysis]: Checked inductivity of 2285 backedges. 1250 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:05:22,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:05:24,964 INFO L134 CoverageAnalysis]: Checked inductivity of 2285 backedges. 1250 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:05:24,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023138449] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:05:24,964 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:05:24,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 179 [2021-12-07 00:05:24,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282432993] [2021-12-07 00:05:24,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:05:24,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 179 states [2021-12-07 00:05:24,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:05:24,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2021-12-07 00:05:24,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3736, Invalid=28126, Unknown=0, NotChecked=0, Total=31862 [2021-12-07 00:05:24,968 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand has 179 states, 179 states have (on average 2.46927374301676) internal successors, (442), 128 states have internal predecessors, (442), 53 states have call successors, (53), 52 states have call predecessors, (53), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:05:27,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:05:27,057 INFO L93 Difference]: Finished difference Result 309 states and 310 transitions. [2021-12-07 00:05:27,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-12-07 00:05:27,057 INFO L78 Accepts]: Start accepts. Automaton has has 179 states, 179 states have (on average 2.46927374301676) internal successors, (442), 128 states have internal predecessors, (442), 53 states have call successors, (53), 52 states have call predecessors, (53), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 201 [2021-12-07 00:05:27,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:05:27,058 INFO L225 Difference]: With dead ends: 309 [2021-12-07 00:05:27,058 INFO L226 Difference]: Without dead ends: 209 [2021-12-07 00:05:27,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 299 SyntacticMatches, 1 SemanticMatches, 226 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17095 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=6546, Invalid=45210, Unknown=0, NotChecked=0, Total=51756 [2021-12-07 00:05:27,061 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 262 mSDsluCounter, 632 mSDsCounter, 0 mSdLazyCounter, 1885 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 687 SdHoareTripleChecker+Invalid, 1901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1885 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-07 00:05:27,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 687 Invalid, 1901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1885 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-07 00:05:27,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-12-07 00:05:27,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 206. [2021-12-07 00:05:27,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 179 states have (on average 1.011173184357542) internal successors, (181), 179 states have internal predecessors, (181), 26 states have call successors, (26), 26 states have call predecessors, (26), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:05:27,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 207 transitions. [2021-12-07 00:05:27,067 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 207 transitions. Word has length 201 [2021-12-07 00:05:27,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:05:27,067 INFO L470 AbstractCegarLoop]: Abstraction has 206 states and 207 transitions. [2021-12-07 00:05:27,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 179 states, 179 states have (on average 2.46927374301676) internal successors, (442), 128 states have internal predecessors, (442), 53 states have call successors, (53), 52 states have call predecessors, (53), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:05:27,068 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 207 transitions. [2021-12-07 00:05:27,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-12-07 00:05:27,068 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:05:27,068 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:05:27,091 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-12-07 00:05:27,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-12-07 00:05:27,270 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting strlen_recErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-12-07 00:05:27,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:05:27,271 INFO L85 PathProgramCache]: Analyzing trace with hash 250555912, now seen corresponding path program 36 times [2021-12-07 00:05:27,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-07 00:05:27,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207165951] [2021-12-07 00:05:27,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:05:27,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-07 00:05:27,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:05:29,526 INFO L134 CoverageAnalysis]: Checked inductivity of 2378 backedges. 74 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:05:29,526 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-07 00:05:29,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207165951] [2021-12-07 00:05:29,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207165951] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:05:29,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635526941] [2021-12-07 00:05:29,527 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-07 00:05:29,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:05:29,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:05:29,527 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:05:29,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-12-07 00:05:34,622 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2021-12-07 00:05:34,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:05:34,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 812 conjuncts, 127 conjunts are in the unsatisfiable core [2021-12-07 00:05:34,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:05:34,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-07 00:05:34,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-07 00:05:35,173 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-07 00:05:35,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:05:35,466 INFO L134 CoverageAnalysis]: Checked inductivity of 2378 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 2280 trivial. 0 not checked. [2021-12-07 00:05:35,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:05:36,798 INFO L388 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 13 treesize of output 11 [2021-12-07 00:05:36,800 INFO L388 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 20 treesize of output 18 [2021-12-07 00:05:37,422 INFO L134 CoverageAnalysis]: Checked inductivity of 2378 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 2280 trivial. 0 not checked. [2021-12-07 00:05:37,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635526941] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:05:37,423 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-07 00:05:37,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 9, 9] total 97 [2021-12-07 00:05:37,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186034469] [2021-12-07 00:05:37,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-07 00:05:37,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-12-07 00:05:37,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-07 00:05:37,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-12-07 00:05:37,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=9106, Unknown=0, NotChecked=0, Total=9312 [2021-12-07 00:05:37,424 INFO L87 Difference]: Start difference. First operand 206 states and 207 transitions. Second operand has 97 states, 92 states have (on average 2.25) internal successors, (207), 68 states have internal predecessors, (207), 32 states have call successors, (32), 30 states have call predecessors, (32), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:05:49,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:05:49,155 INFO L93 Difference]: Finished difference Result 313 states and 314 transitions. [2021-12-07 00:05:49,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-12-07 00:05:49,155 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 92 states have (on average 2.25) internal successors, (207), 68 states have internal predecessors, (207), 32 states have call successors, (32), 30 states have call predecessors, (32), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 205 [2021-12-07 00:05:49,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:05:49,156 INFO L225 Difference]: With dead ends: 313 [2021-12-07 00:05:49,156 INFO L226 Difference]: Without dead ends: 0 [2021-12-07 00:05:49,158 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 624 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 230 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8897 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=1933, Invalid=51659, Unknown=0, NotChecked=0, Total=53592 [2021-12-07 00:05:49,158 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 87 mSDsluCounter, 2265 mSDsCounter, 0 mSdLazyCounter, 13889 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 2318 SdHoareTripleChecker+Invalid, 14291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 13889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 362 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-12-07 00:05:49,159 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 2318 Invalid, 14291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 13889 Invalid, 0 Unknown, 362 Unchecked, 3.8s Time] [2021-12-07 00:05:49,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-12-07 00:05:49,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-12-07 00:05:49,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:05:49,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-12-07 00:05:49,159 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 205 [2021-12-07 00:05:49,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:05:49,159 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-12-07 00:05:49,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 92 states have (on average 2.25) internal successors, (207), 68 states have internal predecessors, (207), 32 states have call successors, (32), 30 states have call predecessors, (32), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:05:49,159 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-12-07 00:05:49,159 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-12-07 00:05:49,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATION (6 of 7 remaining) [2021-12-07 00:05:49,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATION (5 of 7 remaining) [2021-12-07 00:05:49,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATION (4 of 7 remaining) [2021-12-07 00:05:49,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATION (3 of 7 remaining) [2021-12-07 00:05:49,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK (2 of 7 remaining) [2021-12-07 00:05:49,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location strlen_recErr0REQUIRES_VIOLATION (1 of 7 remaining) [2021-12-07 00:05:49,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location strlen_recErr1REQUIRES_VIOLATION (0 of 7 remaining) [2021-12-07 00:05:49,184 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-12-07 00:05:49,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:05:49,368 INFO L732 BasicCegarLoop]: Path program histogram: [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:05:49,370 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-12-07 00:05:49,372 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 12:05:49 BoogieIcfgContainer [2021-12-07 00:05:49,372 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-12-07 00:05:49,372 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-12-07 00:05:49,372 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-12-07 00:05:49,372 INFO L275 PluginConnector]: Witness Printer initialized [2021-12-07 00:05:49,373 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:01:13" (3/4) ... [2021-12-07 00:05:49,375 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-12-07 00:05:49,380 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure strlen_rec [2021-12-07 00:05:49,383 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2021-12-07 00:05:49,383 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2021-12-07 00:05:49,383 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-12-07 00:05:49,383 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-12-07 00:05:49,404 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/witness.graphml [2021-12-07 00:05:49,404 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-12-07 00:05:49,404 INFO L158 Benchmark]: Toolchain (without parser) took 276067.50ms. Allocated memory was 121.6MB in the beginning and 176.2MB in the end (delta: 54.5MB). Free memory was 86.4MB in the beginning and 63.9MB in the end (delta: 22.5MB). Peak memory consumption was 75.8MB. Max. memory is 16.1GB. [2021-12-07 00:05:49,404 INFO L158 Benchmark]: CDTParser took 0.12ms. Allocated memory is still 81.8MB. Free memory was 61.2MB in the beginning and 61.2MB in the end (delta: 24.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-07 00:05:49,405 INFO L158 Benchmark]: CACSL2BoogieTranslator took 280.17ms. Allocated memory is still 121.6MB. Free memory was 86.4MB in the beginning and 92.0MB in the end (delta: -5.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-07 00:05:49,405 INFO L158 Benchmark]: Boogie Procedure Inliner took 29.04ms. Allocated memory is still 121.6MB. Free memory was 92.0MB in the beginning and 90.4MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-07 00:05:49,405 INFO L158 Benchmark]: Boogie Preprocessor took 17.04ms. Allocated memory is still 121.6MB. Free memory was 90.4MB in the beginning and 89.2MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-07 00:05:49,405 INFO L158 Benchmark]: RCFGBuilder took 239.62ms. Allocated memory is still 121.6MB. Free memory was 89.2MB in the beginning and 78.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-07 00:05:49,405 INFO L158 Benchmark]: TraceAbstraction took 275465.15ms. Allocated memory was 121.6MB in the beginning and 176.2MB in the end (delta: 54.5MB). Free memory was 78.3MB in the beginning and 66.6MB in the end (delta: 11.7MB). Peak memory consumption was 67.6MB. Max. memory is 16.1GB. [2021-12-07 00:05:49,406 INFO L158 Benchmark]: Witness Printer took 31.89ms. Allocated memory is still 176.2MB. Free memory was 66.6MB in the beginning and 63.9MB in the end (delta: 2.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-07 00:05:49,407 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12ms. Allocated memory is still 81.8MB. Free memory was 61.2MB in the beginning and 61.2MB in the end (delta: 24.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 280.17ms. Allocated memory is still 121.6MB. Free memory was 86.4MB in the beginning and 92.0MB in the end (delta: -5.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 29.04ms. Allocated memory is still 121.6MB. Free memory was 92.0MB in the beginning and 90.4MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 17.04ms. Allocated memory is still 121.6MB. Free memory was 90.4MB in the beginning and 89.2MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 239.62ms. Allocated memory is still 121.6MB. Free memory was 89.2MB in the beginning and 78.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 275465.15ms. Allocated memory was 121.6MB in the beginning and 176.2MB in the end (delta: 54.5MB). Free memory was 78.3MB in the beginning and 66.6MB in the end (delta: 11.7MB). Peak memory consumption was 67.6MB. Max. memory is 16.1GB. * Witness Printer took 31.89ms. Allocated memory is still 176.2MB. Free memory was 66.6MB in the beginning and 63.9MB in the end (delta: 2.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 520]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 515]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 515]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 28 locations, 7 error locations. Started 1 CEGAR loops. OverallTime: 275.4s, OverallIterations: 46, TraceHistogramMax: 26, PathProgramHistogramMax: 36, EmptinessCheckTime: 0.0s, AutomataDifference: 100.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 6650 SdHoareTripleChecker+Valid, 37.4s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 6643 mSDsluCounter, 53220 SdHoareTripleChecker+Invalid, 31.5s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 8907 IncrementalHoareTripleChecker+Unchecked, 51517 mSDsCounter, 801 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 138752 IncrementalHoareTripleChecker+Invalid, 148460 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 801 mSolverCounterUnsat, 1703 mSDtfsCounter, 138752 mSolverCounterSat, 0.2s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 10825 GetRequests, 6253 SyntacticMatches, 71 SemanticMatches, 4501 ConstructedPredicates, 0 IntricatePredicates, 33 DeprecatedPredicates, 126695 ImplicationChecksByTransitivity, 184.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=206occurred in iteration=45, InterpolantAutomatonStates: 2087, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 46 MinimizatonAttempts, 155 StatesRemovedByMinimization, 41 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.5s SsaConstructionTime, 11.1s SatisfiabilityAnalysisTime, 153.4s InterpolantComputationTime, 8094 NumberOfCodeBlocks, 8010 NumberOfCodeBlocksAsserted, 347 NumberOfCheckSat, 11980 ConstructedInterpolants, 460 QuantifiedInterpolants, 134439 SizeOfPredicates, 1231 NumberOfNonLiveVariables, 15907 ConjunctsInSsa, 4629 ConjunctsInUnsatCore, 120 InterpolantComputations, 9 PerfectInterpolantSequences, 30578/89866 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 7 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-12-07 00:05:49,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187e8823-ffde-43ee-b8c7-d0de1c973cbf/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE