./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU --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 fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:05:13,846 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:05:13,849 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:05:13,905 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:05:13,906 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:05:13,915 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:05:13,916 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:05:13,919 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:05:13,921 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:05:13,925 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:05:13,927 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:05:13,930 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:05:13,931 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:05:13,939 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:05:13,942 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:05:13,947 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:05:13,948 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:05:13,949 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:05:13,951 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:05:13,954 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:05:13,956 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:05:13,957 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:05:13,958 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:05:13,959 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:05:13,963 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:05:13,963 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:05:13,964 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:05:13,965 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:05:13,966 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:05:13,967 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:05:13,967 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:05:13,968 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:05:13,969 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:05:13,970 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:05:13,971 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:05:13,972 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:05:13,973 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:05:13,973 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:05:13,973 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:05:13,974 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:05:13,975 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:05:13,977 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-02 22:05:14,027 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:05:14,027 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:05:14,028 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:05:14,028 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:05:14,030 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:05:14,030 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:05:14,030 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:05:14,030 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:05:14,031 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:05:14,031 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:05:14,032 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:05:14,032 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:05:14,032 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:05:14,033 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:05:14,033 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:05:14,033 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 22:05:14,033 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:05:14,033 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:05:14,034 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:05:14,034 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:05:14,034 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:05:14,034 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:05:14,034 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:05:14,035 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:05:14,035 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:05:14,035 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:05:14,035 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:05:14,036 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:05:14,036 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:05:14,036 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_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 [2021-11-02 22:05:14,300 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:05:14,319 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:05:14,321 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:05:14,323 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:05:14,327 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:05:14,328 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2021-11-02 22:05:14,400 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/data/22d18df1a/776d1a4b487f4c86b93157186b213b0f/FLAGe5a08f2ee [2021-11-02 22:05:14,918 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:05:14,924 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2021-11-02 22:05:14,950 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/data/22d18df1a/776d1a4b487f4c86b93157186b213b0f/FLAGe5a08f2ee [2021-11-02 22:05:15,213 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/data/22d18df1a/776d1a4b487f4c86b93157186b213b0f [2021-11-02 22:05:15,215 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:05:15,217 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:05:15,218 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:05:15,218 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:05:15,230 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:05:15,230 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,232 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6afc83c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15, skipping insertion in model container [2021-11-02 22:05:15,233 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,240 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:05:15,298 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:05:15,624 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i[24987,25000] [2021-11-02 22:05:15,627 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:05:15,636 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:05:15,686 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i[24987,25000] [2021-11-02 22:05:15,687 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:05:15,723 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:05:15,724 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15 WrapperNode [2021-11-02 22:05:15,724 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:05:15,726 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:05:15,726 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:05:15,726 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:05:15,740 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,740 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,758 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,758 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,780 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,786 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,791 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,806 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:05:15,807 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:05:15,808 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:05:15,808 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:05:15,810 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15" (1/1) ... [2021-11-02 22:05:15,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:05:15,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:05:15,849 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:05:15,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:05:15,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:05:15,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:05:15,882 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-02 22:05:15,883 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 22:05:15,883 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 22:05:15,883 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-11-02 22:05:15,883 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2021-11-02 22:05:15,883 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create_with_sublist [2021-11-02 22:05:15,883 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_length [2021-11-02 22:05:15,883 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_append [2021-11-02 22:05:15,884 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_hierarchical_destroy [2021-11-02 22:05:15,884 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:05:15,884 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 22:05:15,884 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-02 22:05:15,884 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-02 22:05:15,884 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-02 22:05:15,884 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-02 22:05:15,884 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:05:15,885 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 22:05:15,885 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 22:05:15,885 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 22:05:15,885 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 22:05:15,885 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 22:05:15,885 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 22:05:15,885 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 22:05:15,886 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 22:05:15,886 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 22:05:15,886 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 22:05:15,886 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 22:05:15,886 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 22:05:15,886 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 22:05:15,886 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 22:05:15,892 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 22:05:15,893 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 22:05:15,893 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 22:05:15,893 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 22:05:15,893 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 22:05:15,893 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 22:05:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 22:05:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 22:05:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 22:05:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 22:05:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 22:05:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 22:05:15,895 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 22:05:15,895 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 22:05:15,895 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 22:05:15,895 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 22:05:15,896 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 22:05:15,897 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 22:05:15,897 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 22:05:15,897 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 22:05:15,897 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 22:05:15,897 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 22:05:15,898 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 22:05:15,898 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 22:05:15,898 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 22:05:15,898 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 22:05:15,899 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 22:05:15,899 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 22:05:15,899 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 22:05:15,899 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 22:05:15,899 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 22:05:15,899 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 22:05:15,900 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 22:05:15,900 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 22:05:15,902 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 22:05:15,902 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 22:05:15,903 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 22:05:15,904 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 22:05:15,904 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 22:05:15,904 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:05:15,904 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 22:05:15,905 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 22:05:15,905 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:05:15,905 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-02 22:05:15,905 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 22:05:15,906 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 22:05:15,906 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 22:05:15,906 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-02 22:05:15,906 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 22:05:15,906 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-02 22:05:15,906 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 22:05:15,907 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 22:05:15,908 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-02 22:05:15,908 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 22:05:15,908 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 22:05:15,908 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 22:05:15,909 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 22:05:15,909 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 22:05:15,909 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 22:05:15,909 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 22:05:15,909 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 22:05:15,910 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 22:05:15,910 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 22:05:15,910 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 22:05:15,910 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 22:05:15,910 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 22:05:15,910 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 22:05:15,911 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 22:05:15,911 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 22:05:15,911 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 22:05:15,911 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 22:05:15,911 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 22:05:15,911 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 22:05:15,912 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 22:05:15,912 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 22:05:15,912 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 22:05:15,913 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 22:05:15,914 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 22:05:15,914 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 22:05:15,914 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 22:05:15,914 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 22:05:15,914 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 22:05:15,915 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 22:05:15,915 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 22:05:15,915 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 22:05:15,915 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 22:05:15,915 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 22:05:15,915 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 22:05:15,915 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 22:05:15,916 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 22:05:15,916 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 22:05:15,916 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-11-02 22:05:15,916 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2021-11-02 22:05:15,917 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 22:05:15,917 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-02 22:05:15,918 INFO L130 BoogieDeclarations]: Found specification of procedure node_create_with_sublist [2021-11-02 22:05:15,921 INFO L130 BoogieDeclarations]: Found specification of procedure sll_length [2021-11-02 22:05:15,921 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-02 22:05:15,922 INFO L130 BoogieDeclarations]: Found specification of procedure sll_append [2021-11-02 22:05:15,922 INFO L130 BoogieDeclarations]: Found specification of procedure sll_hierarchical_destroy [2021-11-02 22:05:15,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:05:15,924 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:05:15,924 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-02 22:05:15,924 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:05:15,924 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 22:05:15,929 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:05:15,930 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:05:15,930 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:05:16,294 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-11-02 22:05:16,694 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:05:16,695 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-02 22:05:16,697 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:05:16 BoogieIcfgContainer [2021-11-02 22:05:16,698 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:05:16,700 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:05:16,700 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:05:16,704 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:05:16,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:05:15" (1/3) ... [2021-11-02 22:05:16,705 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44ee09e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:05:16, skipping insertion in model container [2021-11-02 22:05:16,705 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:05:15" (2/3) ... [2021-11-02 22:05:16,705 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44ee09e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:05:16, skipping insertion in model container [2021-11-02 22:05:16,706 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:05:16" (3/3) ... [2021-11-02 22:05:16,707 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_of_sll_nondet_append-1.i [2021-11-02 22:05:16,713 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:05:16,713 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 42 error locations. [2021-11-02 22:05:16,761 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:05:16,768 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 [2021-11-02 22:05:16,768 INFO L340 AbstractCegarLoop]: Starting to check reachability of 42 error locations. [2021-11-02 22:05:16,789 INFO L276 IsEmpty]: Start isEmpty. Operand has 137 states, 78 states have (on average 1.8717948717948718) internal successors, (146), 121 states have internal predecessors, (146), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 22:05:16,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-02 22:05:16,799 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:16,800 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:16,800 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:16,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:16,807 INFO L85 PathProgramCache]: Analyzing trace with hash -763880064, now seen corresponding path program 1 times [2021-11-02 22:05:16,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:16,826 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765276579] [2021-11-02 22:05:16,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:16,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:16,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:17,070 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:17,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:17,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:17,108 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:17,108 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765276579] [2021-11-02 22:05:17,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765276579] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:17,109 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:17,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:05:17,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940329707] [2021-11-02 22:05:17,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 22:05:17,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:17,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 22:05:17,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 22:05:17,158 INFO L87 Difference]: Start difference. First operand has 137 states, 78 states have (on average 1.8717948717948718) internal successors, (146), 121 states have internal predecessors, (146), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:17,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:17,484 INFO L93 Difference]: Finished difference Result 169 states and 187 transitions. [2021-11-02 22:05:17,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 22:05:17,485 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 8 [2021-11-02 22:05:17,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:17,500 INFO L225 Difference]: With dead ends: 169 [2021-11-02 22:05:17,500 INFO L226 Difference]: Without dead ends: 162 [2021-11-02 22:05:17,502 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 22:05:17,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-02 22:05:17,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 130. [2021-11-02 22:05:17,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 75 states have (on average 1.7333333333333334) internal successors, (130), 116 states have internal predecessors, (130), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-02 22:05:17,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 143 transitions. [2021-11-02 22:05:17,572 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 143 transitions. Word has length 8 [2021-11-02 22:05:17,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:17,572 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 143 transitions. [2021-11-02 22:05:17,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:17,573 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 143 transitions. [2021-11-02 22:05:17,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-02 22:05:17,573 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:17,573 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:17,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:05:17,574 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:17,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:17,574 INFO L85 PathProgramCache]: Analyzing trace with hash -763880870, now seen corresponding path program 1 times [2021-11-02 22:05:17,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:17,575 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103330086] [2021-11-02 22:05:17,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:17,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:17,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:17,648 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:17,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:17,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:17,660 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:17,660 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103330086] [2021-11-02 22:05:17,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103330086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:17,661 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:17,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:05:17,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10469050] [2021-11-02 22:05:17,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:05:17,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:17,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:05:17,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:05:17,663 INFO L87 Difference]: Start difference. First operand 130 states and 143 transitions. Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:17,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:17,954 INFO L93 Difference]: Finished difference Result 169 states and 188 transitions. [2021-11-02 22:05:17,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:05:17,955 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 8 [2021-11-02 22:05:17,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:17,961 INFO L225 Difference]: With dead ends: 169 [2021-11-02 22:05:17,961 INFO L226 Difference]: Without dead ends: 169 [2021-11-02 22:05:17,962 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:05:17,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-02 22:05:17,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 131. [2021-11-02 22:05:17,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 76 states have (on average 1.7236842105263157) internal successors, (131), 117 states have internal predecessors, (131), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-02 22:05:17,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 144 transitions. [2021-11-02 22:05:17,999 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 144 transitions. Word has length 8 [2021-11-02 22:05:17,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:17,999 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 144 transitions. [2021-11-02 22:05:18,000 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:18,000 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 144 transitions. [2021-11-02 22:05:18,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-02 22:05:18,001 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:18,001 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:18,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:05:18,001 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:18,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:18,002 INFO L85 PathProgramCache]: Analyzing trace with hash 987569205, now seen corresponding path program 1 times [2021-11-02 22:05:18,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:18,003 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973734035] [2021-11-02 22:05:18,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:18,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:18,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:18,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:18,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:18,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:05:18,078 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:18,078 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973734035] [2021-11-02 22:05:18,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973734035] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:18,079 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:18,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:05:18,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566133] [2021-11-02 22:05:18,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:05:18,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:18,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:05:18,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:05:18,081 INFO L87 Difference]: Start difference. First operand 131 states and 144 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:18,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:18,374 INFO L93 Difference]: Finished difference Result 171 states and 191 transitions. [2021-11-02 22:05:18,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:05:18,375 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-02 22:05:18,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:18,376 INFO L225 Difference]: With dead ends: 171 [2021-11-02 22:05:18,376 INFO L226 Difference]: Without dead ends: 171 [2021-11-02 22:05:18,377 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:05:18,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-02 22:05:18,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 136. [2021-11-02 22:05:18,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 82 states have (on average 1.7073170731707317) internal successors, (140), 122 states have internal predecessors, (140), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-02 22:05:18,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 153 transitions. [2021-11-02 22:05:18,399 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 153 transitions. Word has length 13 [2021-11-02 22:05:18,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:18,400 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 153 transitions. [2021-11-02 22:05:18,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:18,400 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 153 transitions. [2021-11-02 22:05:18,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-02 22:05:18,401 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:18,401 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:18,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:05:18,401 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr1REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:18,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:18,403 INFO L85 PathProgramCache]: Analyzing trace with hash 987569206, now seen corresponding path program 1 times [2021-11-02 22:05:18,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:18,403 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447124013] [2021-11-02 22:05:18,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:18,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:18,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:18,520 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:18,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:18,528 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:18,529 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:18,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447124013] [2021-11-02 22:05:18,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447124013] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:18,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168323396] [2021-11-02 22:05:18,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:18,530 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:18,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:05:18,531 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:05:18,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:05:18,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:18,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-02 22:05:18,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:05:18,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:18,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168323396] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:18,797 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:05:18,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2021-11-02 22:05:18,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934266188] [2021-11-02 22:05:18,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:05:18,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:18,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:05:18,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:05:18,798 INFO L87 Difference]: Start difference. First operand 136 states and 153 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:19,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:19,152 INFO L93 Difference]: Finished difference Result 191 states and 221 transitions. [2021-11-02 22:05:19,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:05:19,153 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-02 22:05:19,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:19,154 INFO L225 Difference]: With dead ends: 191 [2021-11-02 22:05:19,170 INFO L226 Difference]: Without dead ends: 191 [2021-11-02 22:05:19,171 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:05:19,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-02 22:05:19,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 148. [2021-11-02 22:05:19,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 93 states have (on average 1.6666666666666667) internal successors, (155), 133 states have internal predecessors, (155), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 22:05:19,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 170 transitions. [2021-11-02 22:05:19,178 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 170 transitions. Word has length 13 [2021-11-02 22:05:19,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:19,178 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 170 transitions. [2021-11-02 22:05:19,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:19,178 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 170 transitions. [2021-11-02 22:05:19,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:05:19,179 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:19,179 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:19,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:05:19,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:19,380 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting sll_createErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:19,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:19,381 INFO L85 PathProgramCache]: Analyzing trace with hash -90083310, now seen corresponding path program 1 times [2021-11-02 22:05:19,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:19,381 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180051675] [2021-11-02 22:05:19,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:19,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:19,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:19,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:19,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:19,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:19,477 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:19,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180051675] [2021-11-02 22:05:19,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1180051675] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:19,477 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:19,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:05:19,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753102904] [2021-11-02 22:05:19,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:05:19,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:19,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:05:19,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:05:19,479 INFO L87 Difference]: Start difference. First operand 148 states and 170 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:19,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:19,725 INFO L93 Difference]: Finished difference Result 179 states and 204 transitions. [2021-11-02 22:05:19,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:05:19,725 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-11-02 22:05:19,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:19,727 INFO L225 Difference]: With dead ends: 179 [2021-11-02 22:05:19,727 INFO L226 Difference]: Without dead ends: 179 [2021-11-02 22:05:19,728 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:05:19,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-02 22:05:19,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 147. [2021-11-02 22:05:19,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 93 states have (on average 1.6559139784946237) internal successors, (154), 132 states have internal predecessors, (154), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 22:05:19,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 169 transitions. [2021-11-02 22:05:19,736 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 169 transitions. Word has length 20 [2021-11-02 22:05:19,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:19,737 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 169 transitions. [2021-11-02 22:05:19,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:19,737 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 169 transitions. [2021-11-02 22:05:19,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:05:19,738 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:19,739 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:19,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-02 22:05:19,739 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting sll_createErr1REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:19,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:19,740 INFO L85 PathProgramCache]: Analyzing trace with hash -90083309, now seen corresponding path program 1 times [2021-11-02 22:05:19,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:19,743 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837683193] [2021-11-02 22:05:19,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:19,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:19,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:19,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:19,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:19,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:19,862 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:19,862 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837683193] [2021-11-02 22:05:19,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837683193] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:19,863 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:19,863 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:05:19,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689645786] [2021-11-02 22:05:19,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:05:19,865 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:19,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:05:19,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:05:19,869 INFO L87 Difference]: Start difference. First operand 147 states and 169 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:20,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:20,111 INFO L93 Difference]: Finished difference Result 178 states and 203 transitions. [2021-11-02 22:05:20,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:05:20,112 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-11-02 22:05:20,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:20,113 INFO L225 Difference]: With dead ends: 178 [2021-11-02 22:05:20,113 INFO L226 Difference]: Without dead ends: 178 [2021-11-02 22:05:20,114 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:05:20,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-02 22:05:20,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 146. [2021-11-02 22:05:20,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 93 states have (on average 1.6451612903225807) internal successors, (153), 131 states have internal predecessors, (153), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 22:05:20,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 168 transitions. [2021-11-02 22:05:20,121 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 168 transitions. Word has length 20 [2021-11-02 22:05:20,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:20,122 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 168 transitions. [2021-11-02 22:05:20,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:20,122 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 168 transitions. [2021-11-02 22:05:20,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 22:05:20,123 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:20,123 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:20,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-02 22:05:20,124 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr1REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:20,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:20,124 INFO L85 PathProgramCache]: Analyzing trace with hash 1948650299, now seen corresponding path program 2 times [2021-11-02 22:05:20,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:20,129 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994873494] [2021-11-02 22:05:20,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:20,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:20,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:20,235 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:20,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:20,246 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:20,247 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:20,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994873494] [2021-11-02 22:05:20,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994873494] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:20,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713106315] [2021-11-02 22:05:20,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:05:20,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:20,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:05:20,251 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:05:20,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:05:20,376 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-02 22:05:20,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:05:20,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 22:05:20,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:05:20,459 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 [2021-11-02 22:05:20,585 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-02 22:05:20,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1713106315] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:20,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:05:20,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2021-11-02 22:05:20,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725945155] [2021-11-02 22:05:20,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 22:05:20,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:20,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 22:05:20,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:05:20,588 INFO L87 Difference]: Start difference. First operand 146 states and 168 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:20,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:20,650 INFO L93 Difference]: Finished difference Result 170 states and 200 transitions. [2021-11-02 22:05:20,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 22:05:20,650 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-11-02 22:05:20,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:20,652 INFO L225 Difference]: With dead ends: 170 [2021-11-02 22:05:20,652 INFO L226 Difference]: Without dead ends: 170 [2021-11-02 22:05:20,653 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:05:20,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-02 22:05:20,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 160. [2021-11-02 22:05:20,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 106 states have (on average 1.650943396226415) internal successors, (175), 144 states have internal predecessors, (175), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-02 22:05:20,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 192 transitions. [2021-11-02 22:05:20,661 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 192 transitions. Word has length 18 [2021-11-02 22:05:20,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:20,662 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 192 transitions. [2021-11-02 22:05:20,662 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:20,662 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 192 transitions. [2021-11-02 22:05:20,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 22:05:20,664 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:20,664 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:20,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:05:20,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-02 22:05:20,891 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting node_create_with_sublistErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:20,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:20,891 INFO L85 PathProgramCache]: Analyzing trace with hash -672278325, now seen corresponding path program 1 times [2021-11-02 22:05:20,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:20,891 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334503347] [2021-11-02 22:05:20,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:20,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:20,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:20,979 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:20,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:21,000 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:05:21,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:21,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:21,035 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:21,035 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334503347] [2021-11-02 22:05:21,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334503347] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:21,036 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:21,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:05:21,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986213327] [2021-11-02 22:05:21,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:05:21,037 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:21,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:05:21,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:05:21,038 INFO L87 Difference]: Start difference. First operand 160 states and 192 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 7 states have internal predecessors, (15), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:21,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:21,690 INFO L93 Difference]: Finished difference Result 235 states and 272 transitions. [2021-11-02 22:05:21,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:05:21,691 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 7 states have internal predecessors, (15), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2021-11-02 22:05:21,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:21,693 INFO L225 Difference]: With dead ends: 235 [2021-11-02 22:05:21,695 INFO L226 Difference]: Without dead ends: 235 [2021-11-02 22:05:21,697 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:05:21,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-11-02 22:05:21,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 188. [2021-11-02 22:05:21,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 129 states have (on average 1.682170542635659) internal successors, (217), 168 states have internal predecessors, (217), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-02 22:05:21,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 239 transitions. [2021-11-02 22:05:21,708 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 239 transitions. Word has length 22 [2021-11-02 22:05:21,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:21,708 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 239 transitions. [2021-11-02 22:05:21,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 7 states have internal predecessors, (15), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:21,708 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 239 transitions. [2021-11-02 22:05:21,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 22:05:21,709 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:21,710 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:21,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-02 22:05:21,710 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr8ASSERT_VIOLATIONMEMORY_LEAK === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:21,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:21,711 INFO L85 PathProgramCache]: Analyzing trace with hash -1885741102, now seen corresponding path program 1 times [2021-11-02 22:05:21,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:21,713 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110039734] [2021-11-02 22:05:21,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:21,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:21,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:21,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:21,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:21,794 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-02 22:05:21,794 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:21,795 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110039734] [2021-11-02 22:05:21,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110039734] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:21,795 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:21,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:05:21,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92400693] [2021-11-02 22:05:21,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:05:21,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:21,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:05:21,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:05:21,796 INFO L87 Difference]: Start difference. First operand 188 states and 239 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:22,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:22,170 INFO L93 Difference]: Finished difference Result 211 states and 257 transitions. [2021-11-02 22:05:22,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:05:22,171 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-11-02 22:05:22,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:22,172 INFO L225 Difference]: With dead ends: 211 [2021-11-02 22:05:22,173 INFO L226 Difference]: Without dead ends: 211 [2021-11-02 22:05:22,173 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:05:22,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-02 22:05:22,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 179. [2021-11-02 22:05:22,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 121 states have (on average 1.6446280991735538) internal successors, (199), 160 states have internal predecessors, (199), 10 states have call successors, (10), 9 states have call predecessors, (10), 9 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-02 22:05:22,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 219 transitions. [2021-11-02 22:05:22,179 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 219 transitions. Word has length 22 [2021-11-02 22:05:22,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:22,179 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 219 transitions. [2021-11-02 22:05:22,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:22,180 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 219 transitions. [2021-11-02 22:05:22,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:05:22,181 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:22,181 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:22,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-02 22:05:22,181 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting node_create_with_sublistErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:22,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:22,182 INFO L85 PathProgramCache]: Analyzing trace with hash -1342101918, now seen corresponding path program 1 times [2021-11-02 22:05:22,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:22,182 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394111120] [2021-11-02 22:05:22,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:22,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:22,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:22,266 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:22,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:22,286 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:05:22,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:22,323 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:22,323 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:22,323 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394111120] [2021-11-02 22:05:22,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394111120] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:22,324 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166939836] [2021-11-02 22:05:22,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:22,324 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:22,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:05:22,325 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:05:22,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:05:22,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:22,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-02 22:05:22,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:05:22,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:22,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166939836] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:22,587 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:05:22,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 14 [2021-11-02 22:05:22,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653247033] [2021-11-02 22:05:22,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:05:22,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:22,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:05:22,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:05:22,590 INFO L87 Difference]: Start difference. First operand 179 states and 219 transitions. Second operand has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:23,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:23,299 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2021-11-02 22:05:23,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:05:23,299 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-11-02 22:05:23,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:23,301 INFO L225 Difference]: With dead ends: 243 [2021-11-02 22:05:23,302 INFO L226 Difference]: Without dead ends: 237 [2021-11-02 22:05:23,302 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:05:23,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-11-02 22:05:23,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 180. [2021-11-02 22:05:23,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 123 states have (on average 1.6260162601626016) internal successors, (200), 161 states have internal predecessors, (200), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-02 22:05:23,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 219 transitions. [2021-11-02 22:05:23,309 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 219 transitions. Word has length 26 [2021-11-02 22:05:23,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:23,310 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 219 transitions. [2021-11-02 22:05:23,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:23,310 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 219 transitions. [2021-11-02 22:05:23,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:05:23,311 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:23,312 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:23,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:05:23,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:23,527 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting sll_hierarchical_destroyErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:23,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:23,527 INFO L85 PathProgramCache]: Analyzing trace with hash 44288930, now seen corresponding path program 1 times [2021-11-02 22:05:23,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:23,528 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667083500] [2021-11-02 22:05:23,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:23,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:23,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:23,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:23,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:23,611 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-02 22:05:23,611 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:23,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667083500] [2021-11-02 22:05:23,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [667083500] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:23,612 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:23,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:05:23,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078238512] [2021-11-02 22:05:23,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:05:23,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:23,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:05:23,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:05:23,614 INFO L87 Difference]: Start difference. First operand 180 states and 219 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:24,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:24,012 INFO L93 Difference]: Finished difference Result 216 states and 259 transitions. [2021-11-02 22:05:24,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:05:24,013 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-11-02 22:05:24,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:24,015 INFO L225 Difference]: With dead ends: 216 [2021-11-02 22:05:24,015 INFO L226 Difference]: Without dead ends: 216 [2021-11-02 22:05:24,015 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:05:24,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-11-02 22:05:24,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 185. [2021-11-02 22:05:24,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 126 states have (on average 1.6111111111111112) internal successors, (203), 165 states have internal predecessors, (203), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-02 22:05:24,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 224 transitions. [2021-11-02 22:05:24,023 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 224 transitions. Word has length 25 [2021-11-02 22:05:24,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:24,024 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 224 transitions. [2021-11-02 22:05:24,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:05:24,024 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 224 transitions. [2021-11-02 22:05:24,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 22:05:24,025 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:24,025 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:24,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-02 22:05:24,026 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr9ENSURES_VIOLATIONMEMORY_LEAK === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:24,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:24,026 INFO L85 PathProgramCache]: Analyzing trace with hash 856122746, now seen corresponding path program 1 times [2021-11-02 22:05:24,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:24,026 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11824466] [2021-11-02 22:05:24,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:24,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:24,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:24,081 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:24,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:24,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 22:05:24,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:24,093 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:24,093 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:24,093 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11824466] [2021-11-02 22:05:24,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11824466] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:24,093 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [202115552] [2021-11-02 22:05:24,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:24,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:24,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:05:24,095 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:05:24,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:05:24,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:24,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 22:05:24,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:05:24,386 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:24,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [202115552] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:24,387 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:05:24,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2021-11-02 22:05:24,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682649305] [2021-11-02 22:05:24,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:05:24,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:24,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:05:24,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:05:24,388 INFO L87 Difference]: Start difference. First operand 185 states and 224 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 8 states have internal predecessors, (39), 2 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:05:24,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:24,616 INFO L93 Difference]: Finished difference Result 246 states and 298 transitions. [2021-11-02 22:05:24,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:05:24,617 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 8 states have internal predecessors, (39), 2 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-11-02 22:05:24,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:24,618 INFO L225 Difference]: With dead ends: 246 [2021-11-02 22:05:24,618 INFO L226 Difference]: Without dead ends: 246 [2021-11-02 22:05:24,619 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:05:24,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2021-11-02 22:05:24,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 200. [2021-11-02 22:05:24,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 140 states have (on average 1.5857142857142856) internal successors, (222), 179 states have internal predecessors, (222), 12 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-02 22:05:24,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 245 transitions. [2021-11-02 22:05:24,631 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 245 transitions. Word has length 28 [2021-11-02 22:05:24,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:24,631 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 245 transitions. [2021-11-02 22:05:24,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 8 states have internal predecessors, (39), 2 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:05:24,632 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 245 transitions. [2021-11-02 22:05:24,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:05:24,633 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:24,633 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:24,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:05:24,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:24,851 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting node_create_with_sublistErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:24,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:24,851 INFO L85 PathProgramCache]: Analyzing trace with hash -1946824583, now seen corresponding path program 2 times [2021-11-02 22:05:24,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:24,851 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220642799] [2021-11-02 22:05:24,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:24,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:24,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:24,933 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:24,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:24,954 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:05:24,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:25,014 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:25,014 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:25,014 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220642799] [2021-11-02 22:05:25,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220642799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:25,014 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75249312] [2021-11-02 22:05:25,015 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:05:25,015 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:25,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:05:25,019 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:05:25,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:05:25,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:05:25,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:05:25,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:05:25,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:05:25,308 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:25,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75249312] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:25,309 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:05:25,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 15 [2021-11-02 22:05:25,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693885631] [2021-11-02 22:05:25,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:05:25,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:25,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:05:25,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:05:25,311 INFO L87 Difference]: Start difference. First operand 200 states and 245 transitions. Second operand has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 11 states have internal predecessors, (34), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:26,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:26,003 INFO L93 Difference]: Finished difference Result 266 states and 321 transitions. [2021-11-02 22:05:26,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:05:26,004 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 11 states have internal predecessors, (34), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-11-02 22:05:26,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:26,006 INFO L225 Difference]: With dead ends: 266 [2021-11-02 22:05:26,006 INFO L226 Difference]: Without dead ends: 263 [2021-11-02 22:05:26,006 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:05:26,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-02 22:05:26,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 204. [2021-11-02 22:05:26,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 144 states have (on average 1.5694444444444444) internal successors, (226), 183 states have internal predecessors, (226), 12 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-02 22:05:26,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 249 transitions. [2021-11-02 22:05:26,014 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 249 transitions. Word has length 30 [2021-11-02 22:05:26,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:26,015 INFO L470 AbstractCegarLoop]: Abstraction has 204 states and 249 transitions. [2021-11-02 22:05:26,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 11 states have internal predecessors, (34), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:26,015 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 249 transitions. [2021-11-02 22:05:26,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:05:26,016 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:26,016 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:26,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:05:26,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:26,231 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting node_create_with_sublistErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:26,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:26,231 INFO L85 PathProgramCache]: Analyzing trace with hash -1429629168, now seen corresponding path program 3 times [2021-11-02 22:05:26,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:26,232 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464750164] [2021-11-02 22:05:26,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:26,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:26,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:26,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:26,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:26,338 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:05:26,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:26,994 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:26,994 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:26,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464750164] [2021-11-02 22:05:26,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464750164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:26,995 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151381693] [2021-11-02 22:05:26,995 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:05:26,995 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:26,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:05:26,996 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:05:27,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:05:27,196 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-02 22:05:27,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:05:27,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-02 22:05:27,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:05:27,239 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 [2021-11-02 22:05:27,611 INFO L354 Elim1Store]: treesize reduction 97, result has 17.1 percent of original size [2021-11-02 22:05:27,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 23 treesize of output 31 [2021-11-02 22:05:27,657 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:27,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151381693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:27,658 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:05:27,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 16 [2021-11-02 22:05:27,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493501178] [2021-11-02 22:05:27,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:05:27,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:27,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:05:27,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:05:27,659 INFO L87 Difference]: Start difference. First operand 204 states and 249 transitions. Second operand has 17 states, 16 states have (on average 2.8125) internal successors, (45), 14 states have internal predecessors, (45), 2 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:05:28,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:28,711 INFO L93 Difference]: Finished difference Result 256 states and 309 transitions. [2021-11-02 22:05:28,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:05:28,712 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.8125) internal successors, (45), 14 states have internal predecessors, (45), 2 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-11-02 22:05:28,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:28,714 INFO L225 Difference]: With dead ends: 256 [2021-11-02 22:05:28,714 INFO L226 Difference]: Without dead ends: 256 [2021-11-02 22:05:28,715 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:05:28,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-02 22:05:28,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 212. [2021-11-02 22:05:28,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 152 states have (on average 1.5460526315789473) internal successors, (235), 189 states have internal predecessors, (235), 12 states have call successors, (12), 10 states have call predecessors, (12), 10 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-02 22:05:28,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 260 transitions. [2021-11-02 22:05:28,723 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 260 transitions. Word has length 34 [2021-11-02 22:05:28,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:28,724 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 260 transitions. [2021-11-02 22:05:28,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.8125) internal successors, (45), 14 states have internal predecessors, (45), 2 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:05:28,724 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 260 transitions. [2021-11-02 22:05:28,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:05:28,725 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:28,725 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:28,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:05:28,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-02 22:05:28,939 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting node_create_with_sublistErr1REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:28,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:28,940 INFO L85 PathProgramCache]: Analyzing trace with hash -1429629167, now seen corresponding path program 1 times [2021-11-02 22:05:28,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:28,940 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183762535] [2021-11-02 22:05:28,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:28,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:28,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:29,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:29,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:29,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:05:29,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:29,585 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:29,585 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:29,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183762535] [2021-11-02 22:05:29,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183762535] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:29,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [229171059] [2021-11-02 22:05:29,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:29,586 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:29,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:05:29,591 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:05:29,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 22:05:29,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:29,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-02 22:05:29,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:05:29,855 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 [2021-11-02 22:05:29,859 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 [2021-11-02 22:05:30,331 INFO L354 Elim1Store]: treesize reduction 93, result has 14.7 percent of original size [2021-11-02 22:05:30,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 42 [2021-11-02 22:05:30,368 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-11-02 22:05:30,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 42 [2021-11-02 22:05:30,451 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:30,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [229171059] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:30,451 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:05:30,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 16 [2021-11-02 22:05:30,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030095981] [2021-11-02 22:05:30,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:05:30,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:30,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:05:30,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:05:30,453 INFO L87 Difference]: Start difference. First operand 212 states and 260 transitions. Second operand has 17 states, 16 states have (on average 2.8125) internal successors, (45), 13 states have internal predecessors, (45), 2 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:05:31,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:31,601 INFO L93 Difference]: Finished difference Result 256 states and 306 transitions. [2021-11-02 22:05:31,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:05:31,602 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.8125) internal successors, (45), 13 states have internal predecessors, (45), 2 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-11-02 22:05:31,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:31,604 INFO L225 Difference]: With dead ends: 256 [2021-11-02 22:05:31,604 INFO L226 Difference]: Without dead ends: 256 [2021-11-02 22:05:31,605 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=105, Invalid=401, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:05:31,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-02 22:05:31,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 216. [2021-11-02 22:05:31,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 156 states have (on average 1.5192307692307692) internal successors, (237), 193 states have internal predecessors, (237), 12 states have call successors, (12), 10 states have call predecessors, (12), 10 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-02 22:05:31,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 262 transitions. [2021-11-02 22:05:31,613 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 262 transitions. Word has length 34 [2021-11-02 22:05:31,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:31,613 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 262 transitions. [2021-11-02 22:05:31,613 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.8125) internal successors, (45), 13 states have internal predecessors, (45), 2 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:05:31,614 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 262 transitions. [2021-11-02 22:05:31,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-02 22:05:31,614 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:31,615 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:31,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 22:05:31,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-02 22:05:31,839 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting mainErr9ENSURES_VIOLATIONMEMORY_LEAK === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:31,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:31,839 INFO L85 PathProgramCache]: Analyzing trace with hash -692327467, now seen corresponding path program 2 times [2021-11-02 22:05:31,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:31,839 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295625414] [2021-11-02 22:05:31,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:31,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:31,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:31,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:31,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:31,922 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-11-02 22:05:31,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:31,927 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-02 22:05:31,928 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:31,928 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295625414] [2021-11-02 22:05:31,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295625414] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:31,928 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:31,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:05:31,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883795286] [2021-11-02 22:05:31,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:05:31,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:31,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:05:31,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:05:31,930 INFO L87 Difference]: Start difference. First operand 216 states and 262 transitions. Second operand has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:32,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:32,194 INFO L93 Difference]: Finished difference Result 249 states and 299 transitions. [2021-11-02 22:05:32,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:05:32,195 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 33 [2021-11-02 22:05:32,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:32,196 INFO L225 Difference]: With dead ends: 249 [2021-11-02 22:05:32,196 INFO L226 Difference]: Without dead ends: 238 [2021-11-02 22:05:32,197 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:05:32,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-11-02 22:05:32,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 205. [2021-11-02 22:05:32,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 147 states have (on average 1.5442176870748299) internal successors, (227), 183 states have internal predecessors, (227), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (12), 12 states have call predecessors, (12), 10 states have call successors, (12) [2021-11-02 22:05:32,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 250 transitions. [2021-11-02 22:05:32,203 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 250 transitions. Word has length 33 [2021-11-02 22:05:32,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:32,204 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 250 transitions. [2021-11-02 22:05:32,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:32,204 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 250 transitions. [2021-11-02 22:05:32,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-02 22:05:32,205 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:32,205 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:32,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-02 22:05:32,205 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting node_create_with_sublistErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:32,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:32,206 INFO L85 PathProgramCache]: Analyzing trace with hash 379206183, now seen corresponding path program 4 times [2021-11-02 22:05:32,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:32,206 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619986543] [2021-11-02 22:05:32,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:32,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:32,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:32,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:32,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:32,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:05:32,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:32,363 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:32,364 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:32,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619986543] [2021-11-02 22:05:32,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619986543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:32,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131838752] [2021-11-02 22:05:32,364 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:05:32,364 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:05:32,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:05:32,366 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:05:32,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 22:05:32,587 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:05:32,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:05:32,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-02 22:05:32,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:05:32,760 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:05:32,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131838752] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:05:32,760 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:05:32,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 16 [2021-11-02 22:05:32,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590099702] [2021-11-02 22:05:32,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-02 22:05:32,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:32,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-02 22:05:32,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:05:32,762 INFO L87 Difference]: Start difference. First operand 205 states and 250 transitions. Second operand has 16 states, 15 states have (on average 2.8) internal successors, (42), 12 states have internal predecessors, (42), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:33,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:33,368 INFO L93 Difference]: Finished difference Result 242 states and 273 transitions. [2021-11-02 22:05:33,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:05:33,369 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.8) internal successors, (42), 12 states have internal predecessors, (42), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 38 [2021-11-02 22:05:33,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:33,371 INFO L225 Difference]: With dead ends: 242 [2021-11-02 22:05:33,371 INFO L226 Difference]: Without dead ends: 242 [2021-11-02 22:05:33,371 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:05:33,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-11-02 22:05:33,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 202. [2021-11-02 22:05:33,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 144 states have (on average 1.5347222222222223) internal successors, (221), 181 states have internal predecessors, (221), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-02 22:05:33,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 243 transitions. [2021-11-02 22:05:33,378 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 243 transitions. Word has length 38 [2021-11-02 22:05:33,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:33,378 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 243 transitions. [2021-11-02 22:05:33,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.8) internal successors, (42), 12 states have internal predecessors, (42), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:05:33,379 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 243 transitions. [2021-11-02 22:05:33,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:05:33,380 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:33,380 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:33,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-02 22:05:33,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d994314-a7fc-4973-9dd3-4fac87f64ea4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-02 22:05:33,595 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting sll_appendErr0REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:33,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:33,595 INFO L85 PathProgramCache]: Analyzing trace with hash 283149811, now seen corresponding path program 1 times [2021-11-02 22:05:33,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:33,595 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397735681] [2021-11-02 22:05:33,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:33,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:33,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:33,649 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:33,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:33,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:05:33,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:33,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:05:33,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:33,707 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:05:33,707 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:33,707 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397735681] [2021-11-02 22:05:33,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397735681] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:33,707 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:33,708 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:05:33,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894648605] [2021-11-02 22:05:33,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:05:33,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:33,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:05:33,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:05:33,710 INFO L87 Difference]: Start difference. First operand 202 states and 243 transitions. Second operand has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 5 states have internal predecessors, (25), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:05:34,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:34,037 INFO L93 Difference]: Finished difference Result 229 states and 271 transitions. [2021-11-02 22:05:34,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:05:34,038 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 5 states have internal predecessors, (25), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 41 [2021-11-02 22:05:34,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:34,039 INFO L225 Difference]: With dead ends: 229 [2021-11-02 22:05:34,040 INFO L226 Difference]: Without dead ends: 229 [2021-11-02 22:05:34,040 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:05:34,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-11-02 22:05:34,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 201. [2021-11-02 22:05:34,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 144 states have (on average 1.5208333333333333) internal successors, (219), 180 states have internal predecessors, (219), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-02 22:05:34,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 241 transitions. [2021-11-02 22:05:34,047 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 241 transitions. Word has length 41 [2021-11-02 22:05:34,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:34,047 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 241 transitions. [2021-11-02 22:05:34,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 5 states have internal predecessors, (25), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:05:34,047 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 241 transitions. [2021-11-02 22:05:34,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:05:34,048 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:34,048 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:34,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-02 22:05:34,049 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting sll_appendErr1REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:34,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:34,049 INFO L85 PathProgramCache]: Analyzing trace with hash 283149812, now seen corresponding path program 1 times [2021-11-02 22:05:34,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:34,050 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843309101] [2021-11-02 22:05:34,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:34,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:34,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:34,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:34,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:34,152 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:05:34,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:34,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:05:34,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:34,216 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:05:34,216 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:05:34,216 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843309101] [2021-11-02 22:05:34,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843309101] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:05:34,217 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:05:34,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:05:34,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308340538] [2021-11-02 22:05:34,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:05:34,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:05:34,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:05:34,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:05:34,218 INFO L87 Difference]: Start difference. First operand 201 states and 241 transitions. Second operand has 9 states, 8 states have (on average 3.125) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:05:34,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:05:34,608 INFO L93 Difference]: Finished difference Result 227 states and 268 transitions. [2021-11-02 22:05:34,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:05:34,608 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-11-02 22:05:34,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:05:34,610 INFO L225 Difference]: With dead ends: 227 [2021-11-02 22:05:34,610 INFO L226 Difference]: Without dead ends: 227 [2021-11-02 22:05:34,611 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:05:34,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-02 22:05:34,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 197. [2021-11-02 22:05:34,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 142 states have (on average 1.5070422535211268) internal successors, (214), 176 states have internal predecessors, (214), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-02 22:05:34,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 236 transitions. [2021-11-02 22:05:34,617 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 236 transitions. Word has length 41 [2021-11-02 22:05:34,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:05:34,617 INFO L470 AbstractCegarLoop]: Abstraction has 197 states and 236 transitions. [2021-11-02 22:05:34,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:05:34,618 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 236 transitions. [2021-11-02 22:05:34,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:05:34,619 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:05:34,619 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:05:34,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-02 22:05:34,619 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting sll_appendErr2REQUIRES_VIOLATION === [sll_lengthErr0REQUIRES_VIOLATION, sll_lengthErr1REQUIRES_VIOLATION, sll_hierarchical_destroyErr0REQUIRES_VIOLATION, sll_hierarchical_destroyErr1REQUIRES_VIOLATION (and 38 more)] === [2021-11-02 22:05:34,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:05:34,620 INFO L85 PathProgramCache]: Analyzing trace with hash 187709755, now seen corresponding path program 1 times [2021-11-02 22:05:34,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:05:34,620 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424546244] [2021-11-02 22:05:34,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:05:34,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:05:34,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:34,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:05:34,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:34,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:05:34,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:05:35,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:05:35,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat