./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL --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 b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 04:50:25,823 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 04:50:25,825 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 04:50:25,868 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 04:50:25,869 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 04:50:25,871 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 04:50:25,873 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 04:50:25,875 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 04:50:25,878 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 04:50:25,879 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 04:50:25,881 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 04:50:25,882 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 04:50:25,883 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 04:50:25,884 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 04:50:25,886 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 04:50:25,888 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 04:50:25,890 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 04:50:25,891 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 04:50:25,894 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 04:50:25,897 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 04:50:25,899 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 04:50:25,901 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 04:50:25,903 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 04:50:25,904 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 04:50:25,908 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 04:50:25,909 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 04:50:25,909 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 04:50:25,911 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 04:50:25,911 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 04:50:25,913 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 04:50:25,913 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 04:50:25,914 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 04:50:25,916 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 04:50:25,917 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 04:50:25,918 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 04:50:25,919 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 04:50:25,920 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 04:50:25,921 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 04:50:25,921 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 04:50:25,923 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 04:50:25,924 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 04:50:25,925 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-19 04:50:25,955 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 04:50:25,956 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 04:50:25,956 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-19 04:50:25,956 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-19 04:50:25,957 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 04:50:25,958 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 04:50:25,958 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-19 04:50:25,959 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-19 04:50:25,959 INFO L138 SettingsManager]: * Use SBE=true [2021-11-19 04:50:25,959 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 04:50:25,960 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 04:50:25,960 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-19 04:50:25,960 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 04:50:25,960 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 04:50:25,961 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 04:50:25,961 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-19 04:50:25,961 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-19 04:50:25,961 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-19 04:50:25,962 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 04:50:25,962 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 04:50:25,962 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 04:50:25,962 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 04:50:25,963 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 04:50:25,963 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-19 04:50:25,963 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 04:50:25,964 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 04:50:25,964 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 04:50:25,964 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 04:50:25,964 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-19 04:50:25,965 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 04:50:25,965 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 04:50:25,965 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_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 [2021-11-19 04:50:26,256 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 04:50:26,285 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 04:50:26,287 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 04:50:26,288 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 04:50:26,288 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 04:50:26,289 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2021-11-19 04:50:26,376 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/data/b91d544f1/bddace30cbfd4fbf88b61028b99bc3c8/FLAG45241b2a8 [2021-11-19 04:50:26,841 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 04:50:26,842 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2021-11-19 04:50:26,855 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/data/b91d544f1/bddace30cbfd4fbf88b61028b99bc3c8/FLAG45241b2a8 [2021-11-19 04:50:27,179 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/data/b91d544f1/bddace30cbfd4fbf88b61028b99bc3c8 [2021-11-19 04:50:27,183 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 04:50:27,184 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-19 04:50:27,186 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 04:50:27,186 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 04:50:27,189 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 04:50:27,190 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,191 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bf0057e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27, skipping insertion in model container [2021-11-19 04:50:27,191 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,198 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 04:50:27,241 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 04:50:27,617 WARN L230 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_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2021-11-19 04:50:27,620 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 04:50:27,641 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 04:50:27,681 WARN L230 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_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2021-11-19 04:50:27,682 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 04:50:27,716 INFO L208 MainTranslator]: Completed translation [2021-11-19 04:50:27,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27 WrapperNode [2021-11-19 04:50:27,717 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 04:50:27,718 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 04:50:27,718 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 04:50:27,718 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 04:50:27,732 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,747 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,748 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,766 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,771 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,775 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,782 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 04:50:27,783 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 04:50:27,784 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 04:50:27,784 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 04:50:27,785 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27" (1/1) ... [2021-11-19 04:50:27,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 04:50:27,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:50:27,841 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 04:50:27,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 04:50:27,902 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-19 04:50:27,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 04:50:27,903 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-19 04:50:27,904 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-19 04:50:27,904 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-19 04:50:27,905 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-11-19 04:50:27,905 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-11-19 04:50:27,906 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2021-11-19 04:50:27,906 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_remove_last [2021-11-19 04:50:27,906 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-19 04:50:27,906 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-19 04:50:27,907 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-19 04:50:27,907 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-19 04:50:27,907 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-19 04:50:27,907 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-19 04:50:27,907 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 04:50:27,908 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-19 04:50:27,908 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-19 04:50:27,908 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-19 04:50:27,908 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-19 04:50:27,908 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-19 04:50:27,908 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-19 04:50:27,909 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-19 04:50:27,909 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-19 04:50:27,909 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-19 04:50:27,909 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-19 04:50:27,909 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-19 04:50:27,909 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-19 04:50:27,910 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-19 04:50:27,910 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-19 04:50:27,910 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-19 04:50:27,910 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-19 04:50:27,911 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-19 04:50:27,911 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-19 04:50:27,911 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-19 04:50:27,911 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-19 04:50:27,911 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-19 04:50:27,911 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-19 04:50:27,912 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-19 04:50:27,912 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-19 04:50:27,912 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-19 04:50:27,912 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-19 04:50:27,912 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-19 04:50:27,913 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-19 04:50:27,913 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-19 04:50:27,913 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-19 04:50:27,914 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-19 04:50:27,914 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-19 04:50:27,915 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-19 04:50:27,915 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-19 04:50:27,915 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-19 04:50:27,915 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-19 04:50:27,916 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-19 04:50:27,916 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-19 04:50:27,916 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-19 04:50:27,916 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-19 04:50:27,916 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-19 04:50:27,917 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-19 04:50:27,917 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-19 04:50:27,917 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-19 04:50:27,917 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-19 04:50:27,918 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-19 04:50:27,918 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-19 04:50:27,918 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-19 04:50:27,919 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-19 04:50:27,920 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-19 04:50:27,920 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-19 04:50:27,920 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-19 04:50:27,921 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-19 04:50:27,921 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-19 04:50:27,921 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-19 04:50:27,921 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-19 04:50:27,921 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-19 04:50:27,921 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-19 04:50:27,922 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-19 04:50:27,922 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-19 04:50:27,922 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-19 04:50:27,922 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-19 04:50:27,922 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-19 04:50:27,922 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-19 04:50:27,923 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-19 04:50:27,923 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-19 04:50:27,924 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-19 04:50:27,924 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-19 04:50:27,924 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-19 04:50:27,924 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-19 04:50:27,924 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-19 04:50:27,924 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-19 04:50:27,925 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-19 04:50:27,925 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-19 04:50:27,925 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-19 04:50:27,925 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-19 04:50:27,925 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-19 04:50:27,925 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-19 04:50:27,926 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-19 04:50:27,926 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-19 04:50:27,926 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-19 04:50:27,926 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-19 04:50:27,926 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-19 04:50:27,926 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-19 04:50:27,927 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-19 04:50:27,927 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-19 04:50:27,927 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-19 04:50:27,928 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-19 04:50:27,928 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-19 04:50:27,928 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-19 04:50:27,928 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-19 04:50:27,928 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-19 04:50:27,929 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-19 04:50:27,929 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-19 04:50:27,929 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-19 04:50:27,929 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-19 04:50:27,930 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-19 04:50:27,930 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-19 04:50:27,930 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-19 04:50:27,931 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-19 04:50:27,931 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-19 04:50:27,931 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-19 04:50:27,931 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-19 04:50:27,931 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-19 04:50:27,931 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-11-19 04:50:27,932 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-11-19 04:50:27,932 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-19 04:50:27,932 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-19 04:50:27,933 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-19 04:50:27,934 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2021-11-19 04:50:27,936 INFO L130 BoogieDeclarations]: Found specification of procedure sll_remove_last [2021-11-19 04:50:27,937 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-19 04:50:27,937 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-19 04:50:27,938 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-19 04:50:27,939 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-19 04:50:27,940 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-19 04:50:27,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-19 04:50:27,940 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 04:50:27,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 04:50:27,946 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-19 04:50:28,246 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 04:50:28,248 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 04:50:28,291 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-11-19 04:50:28,562 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 04:50:28,571 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 04:50:28,571 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-19 04:50:28,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:50:28 BoogieIcfgContainer [2021-11-19 04:50:28,573 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 04:50:28,575 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 04:50:28,576 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 04:50:28,580 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 04:50:28,580 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:50:27" (1/3) ... [2021-11-19 04:50:28,581 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57f07859 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:50:28, skipping insertion in model container [2021-11-19 04:50:28,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:50:27" (2/3) ... [2021-11-19 04:50:28,582 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57f07859 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:50:28, skipping insertion in model container [2021-11-19 04:50:28,582 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:50:28" (3/3) ... [2021-11-19 04:50:28,583 INFO L111 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2021-11-19 04:50:28,589 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 04:50:28,589 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 32 error locations. [2021-11-19 04:50:28,659 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 04:50:28,674 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 [2021-11-19 04:50:28,675 INFO L340 AbstractCegarLoop]: Starting to check reachability of 32 error locations. [2021-11-19 04:50:28,727 INFO L276 IsEmpty]: Start isEmpty. Operand has 91 states, 47 states have (on average 1.872340425531915) internal successors, (88), 79 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-19 04:50:28,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-19 04:50:28,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:28,736 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:28,736 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:28,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:28,742 INFO L85 PathProgramCache]: Analyzing trace with hash 67921496, now seen corresponding path program 1 times [2021-11-19 04:50:28,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:28,766 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689366877] [2021-11-19 04:50:28,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:28,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:28,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:29,055 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:29,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:29,067 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:50:29,067 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:29,068 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689366877] [2021-11-19 04:50:29,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689366877] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:29,069 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:29,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:50:29,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244228559] [2021-11-19 04:50:29,072 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:29,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 04:50:29,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:29,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 04:50:29,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 04:50:29,129 INFO L87 Difference]: Start difference. First operand has 91 states, 47 states have (on average 1.872340425531915) internal successors, (88), 79 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-19 04:50:29,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:29,419 INFO L93 Difference]: Finished difference Result 89 states and 93 transitions. [2021-11-19 04:50:29,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 04:50:29,422 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-19 04:50:29,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:29,433 INFO L225 Difference]: With dead ends: 89 [2021-11-19 04:50:29,433 INFO L226 Difference]: Without dead ends: 83 [2021-11-19 04:50:29,435 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 04:50:29,445 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 86 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:29,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 95 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:50:29,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-19 04:50:29,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-19 04:50:29,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 44 states have (on average 1.75) internal successors, (77), 73 states have internal predecessors, (77), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-19 04:50:29,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2021-11-19 04:50:29,510 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 13 [2021-11-19 04:50:29,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:29,511 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2021-11-19 04:50:29,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-19 04:50:29,511 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2021-11-19 04:50:29,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-19 04:50:29,512 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:29,512 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:29,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 04:50:29,513 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:29,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:29,518 INFO L85 PathProgramCache]: Analyzing trace with hash 67921497, now seen corresponding path program 1 times [2021-11-19 04:50:29,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:29,519 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536292960] [2021-11-19 04:50:29,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:29,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:29,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:29,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:29,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:29,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:50:29,624 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:29,625 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536292960] [2021-11-19 04:50:29,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536292960] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:29,626 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:29,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:50:29,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271239917] [2021-11-19 04:50:29,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:29,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 04:50:29,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:29,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 04:50:29,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 04:50:29,632 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-19 04:50:29,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:29,809 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2021-11-19 04:50:29,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 04:50:29,810 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-19 04:50:29,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:29,814 INFO L225 Difference]: With dead ends: 81 [2021-11-19 04:50:29,814 INFO L226 Difference]: Without dead ends: 81 [2021-11-19 04:50:29,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 04:50:29,821 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 77 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:29,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 86 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 04:50:29,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-19 04:50:29,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-11-19 04:50:29,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 71 states have internal predecessors, (75), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-19 04:50:29,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2021-11-19 04:50:29,848 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 13 [2021-11-19 04:50:29,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:29,848 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2021-11-19 04:50:29,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-19 04:50:29,849 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2021-11-19 04:50:29,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-19 04:50:29,850 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:29,850 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:29,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 04:50:29,851 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:29,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:29,851 INFO L85 PathProgramCache]: Analyzing trace with hash 163879501, now seen corresponding path program 1 times [2021-11-19 04:50:29,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:29,852 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610667659] [2021-11-19 04:50:29,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:29,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:29,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:29,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:29,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:29,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:29,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:29,971 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:50:29,971 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:29,971 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610667659] [2021-11-19 04:50:29,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610667659] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:29,973 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:29,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:50:29,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002049089] [2021-11-19 04:50:29,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:29,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 04:50:29,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:29,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 04:50:29,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 04:50:29,992 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-19 04:50:30,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:30,399 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2021-11-19 04:50:30,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:50:30,400 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 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 15 [2021-11-19 04:50:30,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:30,402 INFO L225 Difference]: With dead ends: 92 [2021-11-19 04:50:30,402 INFO L226 Difference]: Without dead ends: 89 [2021-11-19 04:50:30,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-19 04:50:30,403 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 136 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:30,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 68 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 04:50:30,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-19 04:50:30,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 82. [2021-11-19 04:50:30,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 72 states have internal predecessors, (76), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-19 04:50:30,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2021-11-19 04:50:30,416 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 15 [2021-11-19 04:50:30,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:30,417 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2021-11-19 04:50:30,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-19 04:50:30,417 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2021-11-19 04:50:30,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-19 04:50:30,418 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:30,418 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:30,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-19 04:50:30,419 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting sll_createErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:30,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:30,419 INFO L85 PathProgramCache]: Analyzing trace with hash -739000516, now seen corresponding path program 1 times [2021-11-19 04:50:30,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:30,420 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670144405] [2021-11-19 04:50:30,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:30,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:30,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:30,474 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:30,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:30,492 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-19 04:50:30,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:30,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:50:30,543 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:30,543 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670144405] [2021-11-19 04:50:30,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670144405] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:30,543 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:30,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:50:30,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454806392] [2021-11-19 04:50:30,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:30,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:50:30,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:30,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:50:30,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:50:30,545 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-19 04:50:30,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:30,906 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-11-19 04:50:30,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:50:30,907 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-11-19 04:50:30,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:30,909 INFO L225 Difference]: With dead ends: 82 [2021-11-19 04:50:30,910 INFO L226 Difference]: Without dead ends: 82 [2021-11-19 04:50:30,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:50:30,911 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 114 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:30,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 65 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 04:50:30,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-19 04:50:30,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-11-19 04:50:30,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 45 states have (on average 1.6666666666666667) internal successors, (75), 71 states have internal predecessors, (75), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-19 04:50:30,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2021-11-19 04:50:30,919 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 19 [2021-11-19 04:50:30,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:30,919 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2021-11-19 04:50:30,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-19 04:50:30,920 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2021-11-19 04:50:30,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-19 04:50:30,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:30,921 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:30,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-19 04:50:30,921 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting sll_createErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:30,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:30,922 INFO L85 PathProgramCache]: Analyzing trace with hash -739000515, now seen corresponding path program 1 times [2021-11-19 04:50:30,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:30,922 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833093643] [2021-11-19 04:50:30,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:30,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:30,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:30,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:30,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:30,999 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-19 04:50:31,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:31,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:50:31,048 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:31,048 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833093643] [2021-11-19 04:50:31,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833093643] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:31,049 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:31,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:50:31,049 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359606466] [2021-11-19 04:50:31,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:31,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:50:31,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:31,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:50:31,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:50:31,052 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-19 04:50:31,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:31,414 INFO L93 Difference]: Finished difference Result 81 states and 85 transitions. [2021-11-19 04:50:31,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:50:31,415 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-11-19 04:50:31,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:31,416 INFO L225 Difference]: With dead ends: 81 [2021-11-19 04:50:31,416 INFO L226 Difference]: Without dead ends: 81 [2021-11-19 04:50:31,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:50:31,417 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 111 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:31,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 65 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 04:50:31,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-19 04:50:31,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2021-11-19 04:50:31,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 45 states have (on average 1.6444444444444444) internal successors, (74), 70 states have internal predecessors, (74), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-19 04:50:31,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 83 transitions. [2021-11-19 04:50:31,429 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 83 transitions. Word has length 19 [2021-11-19 04:50:31,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:31,430 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 83 transitions. [2021-11-19 04:50:31,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-19 04:50:31,435 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 83 transitions. [2021-11-19 04:50:31,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-19 04:50:31,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:31,436 INFO L514 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, 1, 1] [2021-11-19 04:50:31,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-19 04:50:31,440 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:31,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:31,440 INFO L85 PathProgramCache]: Analyzing trace with hash -942427069, now seen corresponding path program 1 times [2021-11-19 04:50:31,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:31,441 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136085612] [2021-11-19 04:50:31,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:31,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:31,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:31,501 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:31,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:31,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:31,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:31,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:31,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:31,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:50:31,603 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:31,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136085612] [2021-11-19 04:50:31,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136085612] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:50:31,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472734139] [2021-11-19 04:50:31,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:31,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:50:31,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:50:31,612 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:50:31,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 04:50:31,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:31,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-19 04:50:31,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:50:31,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:50:31,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:50:32,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:50:32,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472734139] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:50:32,162 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:50:32,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 12 [2021-11-19 04:50:32,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823160267] [2021-11-19 04:50:32,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:50:32,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-19 04:50:32,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:32,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-19 04:50:32,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-19 04:50:32,164 INFO L87 Difference]: Start difference. First operand 80 states and 83 transitions. Second operand has 12 states, 10 states have (on average 3.7) internal successors, (37), 10 states have internal predecessors, (37), 6 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-19 04:50:32,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:32,587 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-11-19 04:50:32,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 04:50:32,588 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 3.7) internal successors, (37), 10 states have internal predecessors, (37), 6 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) Word has length 28 [2021-11-19 04:50:32,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:32,590 INFO L225 Difference]: With dead ends: 94 [2021-11-19 04:50:32,590 INFO L226 Difference]: Without dead ends: 91 [2021-11-19 04:50:32,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=258, Unknown=0, NotChecked=0, Total=342 [2021-11-19 04:50:32,591 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 161 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:32,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 71 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 04:50:32,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-19 04:50:32,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2021-11-19 04:50:32,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 50 states have (on average 1.58) internal successors, (79), 75 states have internal predecessors, (79), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-19 04:50:32,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-11-19 04:50:32,601 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 28 [2021-11-19 04:50:32,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:32,601 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-11-19 04:50:32,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 3.7) internal successors, (37), 10 states have internal predecessors, (37), 6 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-19 04:50:32,602 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-11-19 04:50:32,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-19 04:50:32,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:32,604 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:32,639 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-19 04:50:32,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:50:32,820 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:32,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:32,820 INFO L85 PathProgramCache]: Analyzing trace with hash 1307900429, now seen corresponding path program 2 times [2021-11-19 04:50:32,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:32,821 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111418793] [2021-11-19 04:50:32,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:32,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:32,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:32,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:32,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:32,900 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:32,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:32,957 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:32,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:32,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:32,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:32,988 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:50:32,989 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:32,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111418793] [2021-11-19 04:50:32,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111418793] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:32,989 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:32,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-19 04:50:32,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921187007] [2021-11-19 04:50:32,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:32,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 04:50:32,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:32,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 04:50:32,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-19 04:50:32,995 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 04:50:33,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:33,240 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-11-19 04:50:33,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-19 04:50:33,241 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-11-19 04:50:33,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:33,243 INFO L225 Difference]: With dead ends: 89 [2021-11-19 04:50:33,243 INFO L226 Difference]: Without dead ends: 89 [2021-11-19 04:50:33,244 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-19 04:50:33,245 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 117 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:33,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 63 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:50:33,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-19 04:50:33,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-11-19 04:50:33,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 51 states have (on average 1.5686274509803921) internal successors, (80), 76 states have internal predecessors, (80), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-19 04:50:33,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2021-11-19 04:50:33,269 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 41 [2021-11-19 04:50:33,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:33,271 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2021-11-19 04:50:33,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 04:50:33,272 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2021-11-19 04:50:33,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-19 04:50:33,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:33,275 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:33,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-19 04:50:33,275 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting sll_remove_lastErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:33,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:33,277 INFO L85 PathProgramCache]: Analyzing trace with hash -1532966339, now seen corresponding path program 1 times [2021-11-19 04:50:33,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:33,277 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870159451] [2021-11-19 04:50:33,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:33,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:33,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:33,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:33,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:33,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:33,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:33,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:33,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:33,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:33,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:33,876 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 04:50:33,876 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:33,876 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870159451] [2021-11-19 04:50:33,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870159451] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:50:33,876 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273227381] [2021-11-19 04:50:33,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:33,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:50:33,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:50:33,880 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:50:33,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 04:50:34,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:34,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 04:50:34,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:50:34,077 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 [2021-11-19 04:50:34,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-19 04:50:34,651 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-11-19 04:50:34,652 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 2 case distinctions, treesize of input 20 treesize of output 24 [2021-11-19 04:50:34,826 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:50:34,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:50:38,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273227381] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:50:38,981 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:50:38,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 18 [2021-11-19 04:50:38,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152960598] [2021-11-19 04:50:38,982 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:50:38,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-19 04:50:38,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:38,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-19 04:50:38,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=316, Unknown=2, NotChecked=0, Total=380 [2021-11-19 04:50:38,983 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand has 19 states, 17 states have (on average 3.411764705882353) internal successors, (58), 15 states have internal predecessors, (58), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-19 04:50:39,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:39,430 INFO L93 Difference]: Finished difference Result 115 states and 126 transitions. [2021-11-19 04:50:39,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-19 04:50:39,431 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 3.411764705882353) internal successors, (58), 15 states have internal predecessors, (58), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 43 [2021-11-19 04:50:39,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:39,433 INFO L225 Difference]: With dead ends: 115 [2021-11-19 04:50:39,433 INFO L226 Difference]: Without dead ends: 115 [2021-11-19 04:50:39,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=127, Invalid=627, Unknown=2, NotChecked=0, Total=756 [2021-11-19 04:50:39,434 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 89 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 251 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:39,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 217 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 233 Invalid, 0 Unknown, 251 Unchecked, 0.2s Time] [2021-11-19 04:50:39,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-19 04:50:39,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 108. [2021-11-19 04:50:39,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 68 states have (on average 1.4558823529411764) internal successors, (99), 93 states have internal predecessors, (99), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-19 04:50:39,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 115 transitions. [2021-11-19 04:50:39,443 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 115 transitions. Word has length 43 [2021-11-19 04:50:39,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:39,443 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 115 transitions. [2021-11-19 04:50:39,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 3.411764705882353) internal successors, (58), 15 states have internal predecessors, (58), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-19 04:50:39,444 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 115 transitions. [2021-11-19 04:50:39,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-19 04:50:39,445 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:39,445 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:39,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 04:50:39,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-19 04:50:39,672 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting sll_remove_lastErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:39,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:39,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1532966338, now seen corresponding path program 1 times [2021-11-19 04:50:39,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:39,673 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026947615] [2021-11-19 04:50:39,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:39,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:39,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:39,778 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:39,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:39,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:39,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:39,995 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:40,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:40,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:40,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:40,176 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 04:50:40,176 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:40,176 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026947615] [2021-11-19 04:50:40,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026947615] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:50:40,177 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380149726] [2021-11-19 04:50:40,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:40,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:50:40,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:50:40,180 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:50:40,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 04:50:40,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:40,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-19 04:50:40,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:50:40,325 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 [2021-11-19 04:50:40,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-19 04:50:40,853 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-11-19 04:50:40,853 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 2 case distinctions, treesize of input 25 treesize of output 29 [2021-11-19 04:50:41,020 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 04:50:41,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:50:43,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380149726] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:50:43,340 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:50:43,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2021-11-19 04:50:43,340 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61099181] [2021-11-19 04:50:43,340 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:50:43,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-19 04:50:43,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:43,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-19 04:50:43,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=424, Unknown=1, NotChecked=0, Total=506 [2021-11-19 04:50:43,341 INFO L87 Difference]: Start difference. First operand 108 states and 115 transitions. Second operand has 19 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 8 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-19 04:50:43,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:43,989 INFO L93 Difference]: Finished difference Result 147 states and 155 transitions. [2021-11-19 04:50:43,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-19 04:50:43,990 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 8 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 43 [2021-11-19 04:50:43,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:43,992 INFO L225 Difference]: With dead ends: 147 [2021-11-19 04:50:43,992 INFO L226 Difference]: Without dead ends: 147 [2021-11-19 04:50:43,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=123, Invalid=632, Unknown=1, NotChecked=0, Total=756 [2021-11-19 04:50:43,993 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 211 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 555 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 555 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 325 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:43,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 147 Invalid, 928 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 555 Invalid, 0 Unknown, 325 Unchecked, 0.5s Time] [2021-11-19 04:50:43,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-19 04:50:43,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 108. [2021-11-19 04:50:43,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 68 states have (on average 1.4411764705882353) internal successors, (98), 93 states have internal predecessors, (98), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-19 04:50:44,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 114 transitions. [2021-11-19 04:50:44,000 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 114 transitions. Word has length 43 [2021-11-19 04:50:44,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:44,001 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 114 transitions. [2021-11-19 04:50:44,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 8 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-19 04:50:44,001 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 114 transitions. [2021-11-19 04:50:44,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-19 04:50:44,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:44,003 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:44,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 04:50:44,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:50:44,217 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting sll_remove_lastErr2REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:44,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:44,217 INFO L85 PathProgramCache]: Analyzing trace with hash -277316196, now seen corresponding path program 1 times [2021-11-19 04:50:44,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:44,217 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119648068] [2021-11-19 04:50:44,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:44,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:44,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:44,302 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:44,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:44,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:44,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:44,385 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:44,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:44,390 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:44,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:44,431 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-19 04:50:44,431 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:44,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119648068] [2021-11-19 04:50:44,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119648068] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:44,432 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:44,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-19 04:50:44,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136317384] [2021-11-19 04:50:44,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:44,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 04:50:44,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:44,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 04:50:44,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:50:44,434 INFO L87 Difference]: Start difference. First operand 108 states and 114 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:45,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:45,277 INFO L93 Difference]: Finished difference Result 140 states and 149 transitions. [2021-11-19 04:50:45,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-19 04:50:45,278 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 44 [2021-11-19 04:50:45,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:45,280 INFO L225 Difference]: With dead ends: 140 [2021-11-19 04:50:45,280 INFO L226 Difference]: Without dead ends: 140 [2021-11-19 04:50:45,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=654, Unknown=0, NotChecked=0, Total=756 [2021-11-19 04:50:45,281 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 239 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 971 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 995 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 971 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:45,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 79 Invalid, 995 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 971 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 04:50:45,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-19 04:50:45,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 112. [2021-11-19 04:50:45,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 71 states have (on average 1.4647887323943662) internal successors, (104), 96 states have internal predecessors, (104), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:50:45,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 122 transitions. [2021-11-19 04:50:45,288 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 122 transitions. Word has length 44 [2021-11-19 04:50:45,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:45,289 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 122 transitions. [2021-11-19 04:50:45,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:45,289 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 122 transitions. [2021-11-19 04:50:45,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-19 04:50:45,290 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:45,291 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:45,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-19 04:50:45,291 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting sll_remove_lastErr3REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:45,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:45,291 INFO L85 PathProgramCache]: Analyzing trace with hash -277316195, now seen corresponding path program 1 times [2021-11-19 04:50:45,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:45,292 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809387811] [2021-11-19 04:50:45,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:45,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:45,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:45,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:45,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:45,407 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:45,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:45,495 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:45,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:45,501 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:45,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:45,562 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:50:45,562 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:45,562 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809387811] [2021-11-19 04:50:45,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809387811] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:45,562 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:45,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-19 04:50:45,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531807397] [2021-11-19 04:50:45,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:45,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 04:50:45,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:45,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 04:50:45,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:50:45,564 INFO L87 Difference]: Start difference. First operand 112 states and 122 transitions. Second operand has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:46,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:46,475 INFO L93 Difference]: Finished difference Result 142 states and 151 transitions. [2021-11-19 04:50:46,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-19 04:50:46,475 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 44 [2021-11-19 04:50:46,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:46,476 INFO L225 Difference]: With dead ends: 142 [2021-11-19 04:50:46,477 INFO L226 Difference]: Without dead ends: 142 [2021-11-19 04:50:46,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=102, Invalid=654, Unknown=0, NotChecked=0, Total=756 [2021-11-19 04:50:46,478 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 239 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 975 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 1000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 975 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:46,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 76 Invalid, 1000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 975 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 04:50:46,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-19 04:50:46,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 112. [2021-11-19 04:50:46,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 71 states have (on average 1.4507042253521127) internal successors, (103), 96 states have internal predecessors, (103), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:50:46,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 121 transitions. [2021-11-19 04:50:46,484 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 121 transitions. Word has length 44 [2021-11-19 04:50:46,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:46,485 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 121 transitions. [2021-11-19 04:50:46,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:46,485 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 121 transitions. [2021-11-19 04:50:46,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-19 04:50:46,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:46,486 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:46,487 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-19 04:50:46,487 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting sll_remove_lastErr11REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:46,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:46,487 INFO L85 PathProgramCache]: Analyzing trace with hash -212889571, now seen corresponding path program 1 times [2021-11-19 04:50:46,487 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:46,488 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670668709] [2021-11-19 04:50:46,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:46,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:46,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:46,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,536 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:46,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:46,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:46,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,558 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:50:46,559 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:46,559 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670668709] [2021-11-19 04:50:46,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670668709] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:46,559 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:46,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 04:50:46,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646333097] [2021-11-19 04:50:46,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:46,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 04:50:46,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:46,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 04:50:46,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 04:50:46,561 INFO L87 Difference]: Start difference. First operand 112 states and 121 transitions. Second operand has 5 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-19 04:50:46,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:46,717 INFO L93 Difference]: Finished difference Result 112 states and 123 transitions. [2021-11-19 04:50:46,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-19 04:50:46,718 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 46 [2021-11-19 04:50:46,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:46,722 INFO L225 Difference]: With dead ends: 112 [2021-11-19 04:50:46,722 INFO L226 Difference]: Without dead ends: 112 [2021-11-19 04:50:46,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:50:46,723 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 129 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:46,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 56 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 04:50:46,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-19 04:50:46,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2021-11-19 04:50:46,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 71 states have (on average 1.4225352112676057) internal successors, (101), 94 states have internal predecessors, (101), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:50:46,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 119 transitions. [2021-11-19 04:50:46,729 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 119 transitions. Word has length 46 [2021-11-19 04:50:46,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:46,730 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 119 transitions. [2021-11-19 04:50:46,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-19 04:50:46,730 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 119 transitions. [2021-11-19 04:50:46,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-19 04:50:46,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:46,732 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:50:46,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-19 04:50:46,732 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting sll_remove_lastErr12REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:46,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:46,733 INFO L85 PathProgramCache]: Analyzing trace with hash -212889570, now seen corresponding path program 1 times [2021-11-19 04:50:46,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:46,733 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514155464] [2021-11-19 04:50:46,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:46,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:46,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:46,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,810 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:46,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,826 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:46,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:46,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:46,837 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:50:46,837 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:46,837 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514155464] [2021-11-19 04:50:46,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514155464] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:46,838 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:46,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:50:46,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389238302] [2021-11-19 04:50:46,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:46,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:50:46,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:46,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:50:46,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:50:46,839 INFO L87 Difference]: Start difference. First operand 110 states and 119 transitions. Second operand has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 04:50:47,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:47,163 INFO L93 Difference]: Finished difference Result 107 states and 116 transitions. [2021-11-19 04:50:47,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 04:50:47,163 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), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-11-19 04:50:47,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:47,165 INFO L225 Difference]: With dead ends: 107 [2021-11-19 04:50:47,165 INFO L226 Difference]: Without dead ends: 107 [2021-11-19 04:50:47,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2021-11-19 04:50:47,166 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 174 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:47,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 68 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:50:47,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-19 04:50:47,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-11-19 04:50:47,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 71 states have (on average 1.380281690140845) internal successors, (98), 91 states have internal predecessors, (98), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:50:47,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 116 transitions. [2021-11-19 04:50:47,171 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 116 transitions. Word has length 46 [2021-11-19 04:50:47,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:47,172 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 116 transitions. [2021-11-19 04:50:47,172 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), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 04:50:47,172 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 116 transitions. [2021-11-19 04:50:47,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-19 04:50:47,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:47,173 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-19 04:50:47,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-19 04:50:47,174 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting sll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:47,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:47,174 INFO L85 PathProgramCache]: Analyzing trace with hash 1990344068, now seen corresponding path program 1 times [2021-11-19 04:50:47,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:47,174 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289438501] [2021-11-19 04:50:47,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:47,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:47,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:47,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:47,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:47,271 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:47,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:47,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:47,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:47,363 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:47,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:47,402 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:50:47,402 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:47,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289438501] [2021-11-19 04:50:47,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289438501] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:47,403 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:47,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-19 04:50:47,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004712898] [2021-11-19 04:50:47,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:47,404 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 04:50:47,404 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:47,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 04:50:47,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:50:47,405 INFO L87 Difference]: Start difference. First operand 107 states and 116 transitions. Second operand has 15 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:48,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:48,153 INFO L93 Difference]: Finished difference Result 106 states and 115 transitions. [2021-11-19 04:50:48,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-19 04:50:48,153 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 47 [2021-11-19 04:50:48,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:48,155 INFO L225 Difference]: With dead ends: 106 [2021-11-19 04:50:48,155 INFO L226 Difference]: Without dead ends: 106 [2021-11-19 04:50:48,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2021-11-19 04:50:48,156 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 176 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 773 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 773 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:48,156 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 105 Invalid, 807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 773 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 04:50:48,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-19 04:50:48,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2021-11-19 04:50:48,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 71 states have (on average 1.3661971830985915) internal successors, (97), 90 states have internal predecessors, (97), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:50:48,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 115 transitions. [2021-11-19 04:50:48,164 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 115 transitions. Word has length 47 [2021-11-19 04:50:48,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:48,165 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 115 transitions. [2021-11-19 04:50:48,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:48,165 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 115 transitions. [2021-11-19 04:50:48,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-19 04:50:48,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:48,167 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-19 04:50:48,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-19 04:50:48,167 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting sll_remove_lastErr13REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:48,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:48,168 INFO L85 PathProgramCache]: Analyzing trace with hash 1571555042, now seen corresponding path program 1 times [2021-11-19 04:50:48,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:48,168 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645935769] [2021-11-19 04:50:48,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:48,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:48,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:48,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:48,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:48,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:48,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:48,288 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:48,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:48,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:48,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:48,299 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:50:48,300 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:48,300 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645935769] [2021-11-19 04:50:48,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1645935769] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:48,300 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:48,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:50:48,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565830611] [2021-11-19 04:50:48,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:48,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:50:48,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:48,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:50:48,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:50:48,302 INFO L87 Difference]: Start difference. First operand 106 states and 115 transitions. Second operand has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-19 04:50:48,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:48,703 INFO L93 Difference]: Finished difference Result 106 states and 115 transitions. [2021-11-19 04:50:48,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 04:50:48,704 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 48 [2021-11-19 04:50:48,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:48,705 INFO L225 Difference]: With dead ends: 106 [2021-11-19 04:50:48,705 INFO L226 Difference]: Without dead ends: 106 [2021-11-19 04:50:48,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:50:48,705 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 124 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:48,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 62 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 04:50:48,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-19 04:50:48,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2021-11-19 04:50:48,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 72 states have (on average 1.3472222222222223) internal successors, (97), 89 states have internal predecessors, (97), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:50:48,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 115 transitions. [2021-11-19 04:50:48,710 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 115 transitions. Word has length 48 [2021-11-19 04:50:48,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:48,710 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 115 transitions. [2021-11-19 04:50:48,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-19 04:50:48,710 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 115 transitions. [2021-11-19 04:50:48,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-19 04:50:48,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:48,711 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-19 04:50:48,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-19 04:50:48,712 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting sll_remove_lastErr14REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:48,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:48,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1571555043, now seen corresponding path program 1 times [2021-11-19 04:50:48,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:48,713 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831588197] [2021-11-19 04:50:48,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:48,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:48,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:48,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:48,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:48,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:48,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:48,998 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:48,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:49,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:49,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:49,062 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:50:49,062 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:49,063 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831588197] [2021-11-19 04:50:49,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831588197] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:49,063 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:49,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-11-19 04:50:49,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475969536] [2021-11-19 04:50:49,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:49,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-19 04:50:49,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:49,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-19 04:50:49,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2021-11-19 04:50:49,065 INFO L87 Difference]: Start difference. First operand 105 states and 115 transitions. Second operand has 17 states, 16 states have (on average 2.3125) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:50,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:50,075 INFO L93 Difference]: Finished difference Result 141 states and 153 transitions. [2021-11-19 04:50:50,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-19 04:50:50,076 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 48 [2021-11-19 04:50:50,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:50,077 INFO L225 Difference]: With dead ends: 141 [2021-11-19 04:50:50,077 INFO L226 Difference]: Without dead ends: 141 [2021-11-19 04:50:50,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=134, Invalid=922, Unknown=0, NotChecked=0, Total=1056 [2021-11-19 04:50:50,079 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 235 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 1010 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 1043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:50,079 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [237 Valid, 72 Invalid, 1043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1010 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 04:50:50,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-19 04:50:50,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 117. [2021-11-19 04:50:50,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 83 states have (on average 1.3614457831325302) internal successors, (113), 101 states have internal predecessors, (113), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-19 04:50:50,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 133 transitions. [2021-11-19 04:50:50,086 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 133 transitions. Word has length 48 [2021-11-19 04:50:50,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:50,086 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 133 transitions. [2021-11-19 04:50:50,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:50,087 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 133 transitions. [2021-11-19 04:50:50,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-19 04:50:50,087 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:50,088 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-19 04:50:50,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-19 04:50:50,088 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting sll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:50,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:50,089 INFO L85 PathProgramCache]: Analyzing trace with hash 1571124093, now seen corresponding path program 1 times [2021-11-19 04:50:50,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:50,089 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054496710] [2021-11-19 04:50:50,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:50,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:50,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:50,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:50,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:50,181 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:50,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:50,255 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:50,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:50,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:50,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:50,301 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:50:50,301 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:50,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054496710] [2021-11-19 04:50:50,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054496710] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:50,302 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:50,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-19 04:50:50,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921844489] [2021-11-19 04:50:50,302 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:50,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 04:50:50,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:50,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 04:50:50,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:50:50,304 INFO L87 Difference]: Start difference. First operand 117 states and 133 transitions. Second operand has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 10 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:51,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:51,116 INFO L93 Difference]: Finished difference Result 136 states and 151 transitions. [2021-11-19 04:50:51,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-19 04:50:51,117 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 10 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 48 [2021-11-19 04:50:51,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:51,118 INFO L225 Difference]: With dead ends: 136 [2021-11-19 04:50:51,118 INFO L226 Difference]: Without dead ends: 136 [2021-11-19 04:50:51,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2021-11-19 04:50:51,120 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 194 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 893 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 893 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:51,120 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 89 Invalid, 922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 893 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 04:50:51,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-19 04:50:51,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 120. [2021-11-19 04:50:51,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 86 states have (on average 1.3488372093023255) internal successors, (116), 104 states have internal predecessors, (116), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-19 04:50:51,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 136 transitions. [2021-11-19 04:50:51,126 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 136 transitions. Word has length 48 [2021-11-19 04:50:51,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:51,127 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 136 transitions. [2021-11-19 04:50:51,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 10 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:50:51,127 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 136 transitions. [2021-11-19 04:50:51,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-19 04:50:51,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:51,128 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1] [2021-11-19 04:50:51,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-19 04:50:51,129 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting sll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:51,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:51,129 INFO L85 PathProgramCache]: Analyzing trace with hash 1460206758, now seen corresponding path program 1 times [2021-11-19 04:50:51,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:51,129 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874740418] [2021-11-19 04:50:51,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:51,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:51,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,181 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:51,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:51,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,212 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:51,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:51,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,223 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:50:51,223 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:51,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874740418] [2021-11-19 04:50:51,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874740418] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:51,224 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:51,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-19 04:50:51,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993323999] [2021-11-19 04:50:51,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:51,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 04:50:51,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:51,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 04:50:51,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 04:50:51,226 INFO L87 Difference]: Start difference. First operand 120 states and 136 transitions. Second operand has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-19 04:50:51,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:51,493 INFO L93 Difference]: Finished difference Result 119 states and 135 transitions. [2021-11-19 04:50:51,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:50:51,493 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 49 [2021-11-19 04:50:51,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:51,494 INFO L225 Difference]: With dead ends: 119 [2021-11-19 04:50:51,494 INFO L226 Difference]: Without dead ends: 119 [2021-11-19 04:50:51,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-11-19 04:50:51,496 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 108 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:51,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 61 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:50:51,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-19 04:50:51,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-11-19 04:50:51,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 86 states have (on average 1.3372093023255813) internal successors, (115), 103 states have internal predecessors, (115), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-19 04:50:51,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 135 transitions. [2021-11-19 04:50:51,502 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 135 transitions. Word has length 49 [2021-11-19 04:50:51,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:51,502 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 135 transitions. [2021-11-19 04:50:51,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-19 04:50:51,503 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 135 transitions. [2021-11-19 04:50:51,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-19 04:50:51,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:51,504 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1] [2021-11-19 04:50:51,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-19 04:50:51,504 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting sll_remove_lastErr17REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:51,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:51,505 INFO L85 PathProgramCache]: Analyzing trace with hash -1564089940, now seen corresponding path program 1 times [2021-11-19 04:50:51,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:51,505 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161081350] [2021-11-19 04:50:51,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:51,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:51,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,705 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:51,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:51,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:51,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:51,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:51,998 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 04:50:51,999 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:51,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161081350] [2021-11-19 04:50:51,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161081350] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:51,999 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:50:51,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-11-19 04:50:51,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871886944] [2021-11-19 04:50:51,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:52,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-19 04:50:52,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:52,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-19 04:50:52,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=500, Unknown=0, NotChecked=0, Total=552 [2021-11-19 04:50:52,001 INFO L87 Difference]: Start difference. First operand 119 states and 135 transitions. Second operand has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 04:50:53,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:53,230 INFO L93 Difference]: Finished difference Result 129 states and 139 transitions. [2021-11-19 04:50:53,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-19 04:50:53,231 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 50 [2021-11-19 04:50:53,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:53,232 INFO L225 Difference]: With dead ends: 129 [2021-11-19 04:50:53,232 INFO L226 Difference]: Without dead ends: 129 [2021-11-19 04:50:53,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=228, Invalid=1752, Unknown=0, NotChecked=0, Total=1980 [2021-11-19 04:50:53,234 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 207 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 1368 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 1419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:53,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 121 Invalid, 1419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1368 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 04:50:53,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-19 04:50:53,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 113. [2021-11-19 04:50:53,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 81 states have (on average 1.308641975308642) internal successors, (106), 97 states have internal predecessors, (106), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:50:53,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 124 transitions. [2021-11-19 04:50:53,240 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 124 transitions. Word has length 50 [2021-11-19 04:50:53,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:53,241 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 124 transitions. [2021-11-19 04:50:53,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 04:50:53,241 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 124 transitions. [2021-11-19 04:50:53,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-19 04:50:53,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:53,242 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1] [2021-11-19 04:50:53,242 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-19 04:50:53,242 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting sll_remove_lastErr9REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:53,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:53,243 INFO L85 PathProgramCache]: Analyzing trace with hash -1978230624, now seen corresponding path program 1 times [2021-11-19 04:50:53,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:53,243 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729674340] [2021-11-19 04:50:53,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:53,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:53,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:53,398 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:53,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:53,438 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:53,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:53,571 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:53,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:53,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:53,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:53,716 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:50:53,717 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:53,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729674340] [2021-11-19 04:50:53,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729674340] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:50:53,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267814287] [2021-11-19 04:50:53,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:53,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:50:53,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:50:53,720 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:50:53,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 04:50:53,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:53,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-19 04:50:53,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:50:54,104 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-19 04:50:54,104 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 1 case distinctions, treesize of input 17 treesize of output 19 [2021-11-19 04:50:54,153 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:50:54,154 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-19 04:50:54,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267814287] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:50:54,154 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-19 04:50:54,154 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [21] total 27 [2021-11-19 04:50:54,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445677736] [2021-11-19 04:50:54,154 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:50:54,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:50:54,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:54,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:50:54,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=689, Unknown=0, NotChecked=0, Total=756 [2021-11-19 04:50:54,156 INFO L87 Difference]: Start difference. First operand 113 states and 124 transitions. Second operand has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 04:50:54,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:54,316 INFO L93 Difference]: Finished difference Result 114 states and 127 transitions. [2021-11-19 04:50:54,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-19 04:50:54,316 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 50 [2021-11-19 04:50:54,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:54,317 INFO L225 Difference]: With dead ends: 114 [2021-11-19 04:50:54,318 INFO L226 Difference]: Without dead ends: 114 [2021-11-19 04:50:54,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=895, Unknown=0, NotChecked=0, Total=992 [2021-11-19 04:50:54,319 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 68 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:54,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 244 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 126 Invalid, 0 Unknown, 32 Unchecked, 0.1s Time] [2021-11-19 04:50:54,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-19 04:50:54,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2021-11-19 04:50:54,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 81 states have (on average 1.2962962962962963) internal successors, (105), 96 states have internal predecessors, (105), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:50:54,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 123 transitions. [2021-11-19 04:50:54,325 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 123 transitions. Word has length 50 [2021-11-19 04:50:54,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:54,325 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 123 transitions. [2021-11-19 04:50:54,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 04:50:54,326 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 123 transitions. [2021-11-19 04:50:54,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-19 04:50:54,327 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:54,327 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1] [2021-11-19 04:50:54,366 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-19 04:50:54,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:50:54,552 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting sll_remove_lastErr13REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:54,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:54,552 INFO L85 PathProgramCache]: Analyzing trace with hash 148177176, now seen corresponding path program 1 times [2021-11-19 04:50:54,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:54,552 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032255150] [2021-11-19 04:50:54,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:54,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:54,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:54,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:50:54,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:54,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:50:54,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:54,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:50:54,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:54,992 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:50:54,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:55,103 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:50:55,103 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:50:55,103 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032255150] [2021-11-19 04:50:55,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032255150] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:50:55,103 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135432298] [2021-11-19 04:50:55,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:55,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:50:55,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:50:55,108 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:50:55,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 04:50:55,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:50:55,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-19 04:50:55,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:50:55,493 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-19 04:50:55,493 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 2 case distinctions, treesize of input 17 treesize of output 21 [2021-11-19 04:50:55,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-19 04:50:56,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 53 [2021-11-19 04:50:56,366 INFO L354 Elim1Store]: treesize reduction 3, result has 78.6 percent of original size [2021-11-19 04:50:56,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 32 [2021-11-19 04:50:56,503 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:50:56,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:50:56,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2021-11-19 04:50:56,976 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-19 04:50:56,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 176 treesize of output 1 [2021-11-19 04:50:57,273 INFO L354 Elim1Store]: treesize reduction 13, result has 62.9 percent of original size [2021-11-19 04:50:57,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 120 treesize of output 117 [2021-11-19 04:50:57,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135432298] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:50:57,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:50:57,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20] total 40 [2021-11-19 04:50:57,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023387177] [2021-11-19 04:50:57,528 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:50:57,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-19 04:50:57,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:50:57,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-19 04:50:57,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2410, Unknown=0, NotChecked=0, Total=2550 [2021-11-19 04:50:57,530 INFO L87 Difference]: Start difference. First operand 112 states and 123 transitions. Second operand has 41 states, 39 states have (on average 2.0) internal successors, (78), 31 states have internal predecessors, (78), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 6 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-19 04:50:59,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:50:59,611 INFO L93 Difference]: Finished difference Result 117 states and 127 transitions. [2021-11-19 04:50:59,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-19 04:50:59,612 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 39 states have (on average 2.0) internal successors, (78), 31 states have internal predecessors, (78), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 6 states have call predecessors, (7), 3 states have call successors, (7) Word has length 52 [2021-11-19 04:50:59,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:50:59,614 INFO L225 Difference]: With dead ends: 117 [2021-11-19 04:50:59,614 INFO L226 Difference]: Without dead ends: 117 [2021-11-19 04:50:59,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=326, Invalid=4504, Unknown=0, NotChecked=0, Total=4830 [2021-11-19 04:50:59,617 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 168 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 1898 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 2201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 1898 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-19 04:50:59,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 195 Invalid, 2201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 1898 Invalid, 0 Unknown, 261 Unchecked, 1.1s Time] [2021-11-19 04:50:59,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-19 04:50:59,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2021-11-19 04:50:59,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 82 states have (on average 1.2926829268292683) internal successors, (106), 97 states have internal predecessors, (106), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:50:59,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 124 transitions. [2021-11-19 04:50:59,624 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 124 transitions. Word has length 52 [2021-11-19 04:50:59,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:50:59,624 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 124 transitions. [2021-11-19 04:50:59,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 39 states have (on average 2.0) internal successors, (78), 31 states have internal predecessors, (78), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 6 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-19 04:50:59,624 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 124 transitions. [2021-11-19 04:50:59,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-19 04:50:59,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:50:59,625 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1] [2021-11-19 04:50:59,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 04:50:59,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-19 04:50:59,844 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting sll_remove_lastErr14REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:50:59,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:50:59,844 INFO L85 PathProgramCache]: Analyzing trace with hash 148177177, now seen corresponding path program 1 times [2021-11-19 04:50:59,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:50:59,844 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931658539] [2021-11-19 04:50:59,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:50:59,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:50:59,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:00,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:51:00,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:00,093 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:51:00,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:00,351 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:51:00,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:00,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:51:00,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:00,524 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:51:00,524 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:51:00,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931658539] [2021-11-19 04:51:00,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931658539] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:51:00,525 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906834929] [2021-11-19 04:51:00,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:00,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:51:00,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:51:00,533 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:51:00,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 04:51:00,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:00,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-19 04:51:00,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:51:00,720 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 [2021-11-19 04:51:00,971 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-19 04:51:00,971 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 1 case distinctions, treesize of input 12 treesize of output 14 [2021-11-19 04:51:01,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-11-19 04:51:01,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-19 04:51:01,869 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-19 04:51:01,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 43 [2021-11-19 04:51:01,888 INFO L354 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-11-19 04:51:01,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 31 [2021-11-19 04:51:01,915 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:51:01,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:51:02,723 INFO L354 Elim1Store]: treesize reduction 57, result has 1.7 percent of original size [2021-11-19 04:51:02,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 620 treesize of output 1 [2021-11-19 04:51:03,371 INFO L354 Elim1Store]: treesize reduction 27, result has 57.1 percent of original size [2021-11-19 04:51:03,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 488 treesize of output 459 [2021-11-19 04:51:03,487 INFO L354 Elim1Store]: treesize reduction 37, result has 66.7 percent of original size [2021-11-19 04:51:03,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 1168 treesize of output 1079 [2021-11-19 04:51:04,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906834929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:51:04,792 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:51:04,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24] total 39 [2021-11-19 04:51:04,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262231964] [2021-11-19 04:51:04,793 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:51:04,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-19 04:51:04,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:51:04,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-19 04:51:04,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=2611, Unknown=0, NotChecked=0, Total=2756 [2021-11-19 04:51:04,795 INFO L87 Difference]: Start difference. First operand 113 states and 124 transitions. Second operand has 40 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 30 states have internal predecessors, (70), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-19 04:51:07,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:51:07,419 INFO L93 Difference]: Finished difference Result 130 states and 141 transitions. [2021-11-19 04:51:07,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-19 04:51:07,420 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 30 states have internal predecessors, (70), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) Word has length 52 [2021-11-19 04:51:07,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:51:07,421 INFO L225 Difference]: With dead ends: 130 [2021-11-19 04:51:07,421 INFO L226 Difference]: Without dead ends: 130 [2021-11-19 04:51:07,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=349, Invalid=4907, Unknown=0, NotChecked=0, Total=5256 [2021-11-19 04:51:07,423 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 238 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 2517 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 2785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 2517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 209 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:51:07,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 125 Invalid, 2785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 2517 Invalid, 0 Unknown, 209 Unchecked, 1.4s Time] [2021-11-19 04:51:07,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-19 04:51:07,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 122. [2021-11-19 04:51:07,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 90 states have (on average 1.3111111111111111) internal successors, (118), 106 states have internal predecessors, (118), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-19 04:51:07,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 138 transitions. [2021-11-19 04:51:07,429 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 138 transitions. Word has length 52 [2021-11-19 04:51:07,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:51:07,430 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 138 transitions. [2021-11-19 04:51:07,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 30 states have internal predecessors, (70), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-19 04:51:07,430 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 138 transitions. [2021-11-19 04:51:07,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-19 04:51:07,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:51:07,431 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1] [2021-11-19 04:51:07,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 04:51:07,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-19 04:51:07,660 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting sll_remove_lastErr17REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:51:07,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:51:07,660 INFO L85 PathProgramCache]: Analyzing trace with hash 664348258, now seen corresponding path program 1 times [2021-11-19 04:51:07,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:51:07,661 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328364409] [2021-11-19 04:51:07,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:07,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:51:07,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:07,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:51:07,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:07,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:51:07,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:07,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:51:07,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:07,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:51:07,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:07,774 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:51:07,774 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:51:07,774 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328364409] [2021-11-19 04:51:07,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328364409] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:51:07,774 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371331760] [2021-11-19 04:51:07,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:07,775 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:51:07,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:51:07,780 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:51:07,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 04:51:07,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:07,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-19 04:51:07,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:51:08,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-19 04:51:08,027 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:51:08,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:51:08,118 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:51:08,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371331760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:51:08,119 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:51:08,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 3, 3] total 8 [2021-11-19 04:51:08,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403579334] [2021-11-19 04:51:08,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:51:08,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-19 04:51:08,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:51:08,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-19 04:51:08,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-19 04:51:08,121 INFO L87 Difference]: Start difference. First operand 122 states and 138 transitions. Second operand has 9 states, 8 states have (on average 5.25) internal successors, (42), 7 states have internal predecessors, (42), 1 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-19 04:51:08,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:51:08,505 INFO L93 Difference]: Finished difference Result 126 states and 141 transitions. [2021-11-19 04:51:08,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-19 04:51:08,505 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.25) internal successors, (42), 7 states have internal predecessors, (42), 1 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 54 [2021-11-19 04:51:08,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:51:08,507 INFO L225 Difference]: With dead ends: 126 [2021-11-19 04:51:08,507 INFO L226 Difference]: Without dead ends: 126 [2021-11-19 04:51:08,507 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2021-11-19 04:51:08,508 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 135 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 378 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:51:08,508 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 65 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 378 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:51:08,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-19 04:51:08,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2021-11-19 04:51:08,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 92 states have (on average 1.315217391304348) internal successors, (121), 108 states have internal predecessors, (121), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-19 04:51:08,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 141 transitions. [2021-11-19 04:51:08,513 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 141 transitions. Word has length 54 [2021-11-19 04:51:08,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:51:08,514 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 141 transitions. [2021-11-19 04:51:08,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.25) internal successors, (42), 7 states have internal predecessors, (42), 1 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-19 04:51:08,514 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 141 transitions. [2021-11-19 04:51:08,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-19 04:51:08,515 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:51:08,515 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1] [2021-11-19 04:51:08,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-19 04:51:08,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:51:08,732 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting sll_remove_lastErr18REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:51:08,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:51:08,732 INFO L85 PathProgramCache]: Analyzing trace with hash 664348259, now seen corresponding path program 1 times [2021-11-19 04:51:08,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:51:08,732 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537482787] [2021-11-19 04:51:08,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:08,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:51:08,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:08,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:51:08,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:08,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:51:08,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:09,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:51:09,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:09,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:51:09,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:09,147 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:51:09,147 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:51:09,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537482787] [2021-11-19 04:51:09,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537482787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:51:09,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093399147] [2021-11-19 04:51:09,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:09,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:51:09,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:51:09,149 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:51:09,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 04:51:09,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:09,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 04:51:09,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:51:09,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-19 04:51:09,432 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:51:09,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:51:09,561 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:51:09,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2093399147] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:51:09,562 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:51:09,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 3, 3] total 19 [2021-11-19 04:51:09,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969268923] [2021-11-19 04:51:09,563 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:51:09,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-19 04:51:09,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:51:09,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-19 04:51:09,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=340, Unknown=0, NotChecked=0, Total=380 [2021-11-19 04:51:09,564 INFO L87 Difference]: Start difference. First operand 124 states and 141 transitions. Second operand has 20 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 15 states have internal predecessors, (64), 2 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (5), 3 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:51:10,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:51:10,942 INFO L93 Difference]: Finished difference Result 138 states and 152 transitions. [2021-11-19 04:51:10,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-19 04:51:10,943 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 15 states have internal predecessors, (64), 2 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (5), 3 states have call predecessors, (5), 1 states have call successors, (5) Word has length 54 [2021-11-19 04:51:10,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:51:10,944 INFO L225 Difference]: With dead ends: 138 [2021-11-19 04:51:10,944 INFO L226 Difference]: Without dead ends: 138 [2021-11-19 04:51:10,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=261, Invalid=1719, Unknown=0, NotChecked=0, Total=1980 [2021-11-19 04:51:10,946 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 229 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 1207 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 1257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 04:51:10,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [231 Valid, 80 Invalid, 1257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1207 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 04:51:10,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-19 04:51:10,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 122. [2021-11-19 04:51:10,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 91 states have (on average 1.2857142857142858) internal successors, (117), 106 states have internal predecessors, (117), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-19 04:51:10,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 137 transitions. [2021-11-19 04:51:10,952 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 137 transitions. Word has length 54 [2021-11-19 04:51:10,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:51:10,952 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 137 transitions. [2021-11-19 04:51:10,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 15 states have internal predecessors, (64), 2 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (5), 3 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:51:10,952 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 137 transitions. [2021-11-19 04:51:10,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-19 04:51:10,953 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:51:10,953 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:51:10,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-19 04:51:11,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:51:11,168 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:51:11,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:51:11,168 INFO L85 PathProgramCache]: Analyzing trace with hash -879338143, now seen corresponding path program 1 times [2021-11-19 04:51:11,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:51:11,168 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093644499] [2021-11-19 04:51:11,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:11,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:51:11,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,202 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:51:11,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,215 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:51:11,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:51:11,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,230 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:51:11,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:51:11,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,270 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:51:11,271 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:51:11,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093644499] [2021-11-19 04:51:11,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1093644499] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:51:11,271 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:51:11,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:51:11,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657760007] [2021-11-19 04:51:11,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:51:11,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:51:11,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:51:11,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:51:11,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:51:11,273 INFO L87 Difference]: Start difference. First operand 122 states and 137 transitions. Second operand has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:51:11,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:51:11,560 INFO L93 Difference]: Finished difference Result 132 states and 152 transitions. [2021-11-19 04:51:11,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 04:51:11,562 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 55 [2021-11-19 04:51:11,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:51:11,563 INFO L225 Difference]: With dead ends: 132 [2021-11-19 04:51:11,563 INFO L226 Difference]: Without dead ends: 132 [2021-11-19 04:51:11,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=150, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:51:11,564 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 142 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:51:11,565 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 57 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 270 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:51:11,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-19 04:51:11,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2021-11-19 04:51:11,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 97 states have (on average 1.2989690721649485) internal successors, (126), 112 states have internal predecessors, (126), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 9 states have call successors, (16) [2021-11-19 04:51:11,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 152 transitions. [2021-11-19 04:51:11,571 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 152 transitions. Word has length 55 [2021-11-19 04:51:11,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:51:11,571 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 152 transitions. [2021-11-19 04:51:11,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:51:11,571 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 152 transitions. [2021-11-19 04:51:11,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-19 04:51:11,572 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:51:11,572 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:51:11,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-19 04:51:11,573 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting mainErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:51:11,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:51:11,573 INFO L85 PathProgramCache]: Analyzing trace with hash -879338142, now seen corresponding path program 1 times [2021-11-19 04:51:11,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:51:11,573 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720984772] [2021-11-19 04:51:11,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:11,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:51:11,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:51:11,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,635 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:51:11,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,648 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:51:11,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:51:11,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:51:11,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,673 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:51:11,673 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:51:11,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720984772] [2021-11-19 04:51:11,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720984772] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:51:11,674 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [530208861] [2021-11-19 04:51:11,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:11,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:51:11,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:51:11,680 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:51:11,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-19 04:51:11,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:11,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 04:51:11,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:51:11,904 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:51:11,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:51:11,987 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:51:11,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [530208861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:51:11,988 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:51:11,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 9 [2021-11-19 04:51:11,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265683664] [2021-11-19 04:51:11,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:51:11,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-19 04:51:11,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:51:11,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-19 04:51:11,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-19 04:51:11,990 INFO L87 Difference]: Start difference. First operand 130 states and 152 transitions. Second operand has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 6 states have internal predecessors, (39), 4 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-19 04:51:12,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:51:12,321 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2021-11-19 04:51:12,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-19 04:51:12,321 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 6 states have internal predecessors, (39), 4 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 55 [2021-11-19 04:51:12,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:51:12,323 INFO L225 Difference]: With dead ends: 134 [2021-11-19 04:51:12,323 INFO L226 Difference]: Without dead ends: 134 [2021-11-19 04:51:12,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:51:12,324 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 99 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:51:12,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 71 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 04:51:12,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-19 04:51:12,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-11-19 04:51:12,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 101 states have (on average 1.2871287128712872) internal successors, (130), 114 states have internal predecessors, (130), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (16), 10 states have call predecessors, (16), 9 states have call successors, (16) [2021-11-19 04:51:12,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 156 transitions. [2021-11-19 04:51:12,329 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 156 transitions. Word has length 55 [2021-11-19 04:51:12,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:51:12,330 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 156 transitions. [2021-11-19 04:51:12,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 6 states have internal predecessors, (39), 4 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-19 04:51:12,330 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 156 transitions. [2021-11-19 04:51:12,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-19 04:51:12,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:51:12,331 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:51:12,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-19 04:51:12,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-19 04:51:12,531 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting sll_remove_lastErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:51:12,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:51:12,532 INFO L85 PathProgramCache]: Analyzing trace with hash 1178990387, now seen corresponding path program 2 times [2021-11-19 04:51:12,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:51:12,532 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136776177] [2021-11-19 04:51:12,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:12,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:51:12,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:12,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:51:12,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:12,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:51:12,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:12,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:51:12,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:12,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:51:12,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:12,646 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-11-19 04:51:12,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:12,653 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-19 04:51:12,653 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:51:12,653 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136776177] [2021-11-19 04:51:12,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136776177] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:51:12,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860694193] [2021-11-19 04:51:12,654 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 04:51:12,654 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:51:12,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:51:12,655 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:51:12,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-19 04:51:12,796 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 04:51:12,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 04:51:12,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 04:51:12,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:51:12,933 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-19 04:51:12,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:51:13,152 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-19 04:51:13,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860694193] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 04:51:13,153 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:51:13,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [9, 7] total 14 [2021-11-19 04:51:13,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460260443] [2021-11-19 04:51:13,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:51:13,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 04:51:13,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:51:13,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 04:51:13,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-19 04:51:13,155 INFO L87 Difference]: Start difference. First operand 134 states and 156 transitions. Second operand has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-19 04:51:13,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:51:13,185 INFO L93 Difference]: Finished difference Result 129 states and 145 transitions. [2021-11-19 04:51:13,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-19 04:51:13,196 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 56 [2021-11-19 04:51:13,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:51:13,196 INFO L225 Difference]: With dead ends: 129 [2021-11-19 04:51:13,197 INFO L226 Difference]: Without dead ends: 113 [2021-11-19 04:51:13,197 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-19 04:51:13,197 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 18 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 04:51:13,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 347 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 04:51:13,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-19 04:51:13,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-11-19 04:51:13,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 84 states have (on average 1.2976190476190477) internal successors, (109), 97 states have internal predecessors, (109), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (11), 8 states have call predecessors, (11), 7 states have call successors, (11) [2021-11-19 04:51:13,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 128 transitions. [2021-11-19 04:51:13,203 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 128 transitions. Word has length 56 [2021-11-19 04:51:13,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:51:13,203 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 128 transitions. [2021-11-19 04:51:13,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-19 04:51:13,204 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 128 transitions. [2021-11-19 04:51:13,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-19 04:51:13,204 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:51:13,205 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1] [2021-11-19 04:51:13,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-19 04:51:13,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:51:13,426 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting sll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:51:13,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:51:13,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1511447838, now seen corresponding path program 1 times [2021-11-19 04:51:13,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:51:13,427 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654638258] [2021-11-19 04:51:13,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:13,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:51:13,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:13,579 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:51:13,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:13,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:51:13,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:13,834 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:51:13,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:13,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:51:13,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:13,948 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:51:13,948 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:51:13,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654638258] [2021-11-19 04:51:13,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654638258] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:51:13,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156157044] [2021-11-19 04:51:13,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:51:13,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:51:13,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:51:13,950 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:51:13,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-19 04:51:14,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:51:14,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-19 04:51:14,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:51:14,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-19 04:51:14,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-19 04:51:14,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-11-19 04:51:14,443 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-19 04:51:14,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-19 04:51:15,161 INFO L354 Elim1Store]: treesize reduction 30, result has 9.1 percent of original size [2021-11-19 04:51:15,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 54 [2021-11-19 04:51:15,166 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-19 04:51:15,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 29 [2021-11-19 04:51:15,423 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:51:15,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:51:16,004 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:51:16,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 66 [2021-11-19 04:51:16,328 INFO L354 Elim1Store]: treesize reduction 92, result has 1.1 percent of original size [2021-11-19 04:51:16,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 3857 treesize of output 1 [2021-11-19 04:52:07,010 INFO L354 Elim1Store]: treesize reduction 19, result has 79.6 percent of original size [2021-11-19 04:52:07,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 16201 treesize of output 14326 [2021-11-19 04:52:07,653 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-19 04:52:07,654 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-19 04:52:07,654 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-11-19 04:52:07,654 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868330695] [2021-11-19 04:52:07,654 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-19 04:52:07,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-19 04:52:07,655 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:07,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-19 04:52:07,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2952, Unknown=51, NotChecked=0, Total=3192 [2021-11-19 04:52:07,656 INFO L87 Difference]: Start difference. First operand 113 states and 128 transitions. Second operand has 24 states, 23 states have (on average 2.0) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 04:52:09,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:09,254 INFO L93 Difference]: Finished difference Result 124 states and 139 transitions. [2021-11-19 04:52:09,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-19 04:52:09,255 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 56 [2021-11-19 04:52:09,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:09,256 INFO L225 Difference]: With dead ends: 124 [2021-11-19 04:52:09,256 INFO L226 Difference]: Without dead ends: 124 [2021-11-19 04:52:09,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1117 ImplicationChecksByTransitivity, 52.3s TimeCoverageRelationStatistics Valid=410, Invalid=5545, Unknown=51, NotChecked=0, Total=6006 [2021-11-19 04:52:09,259 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 204 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 1649 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 1689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 1649 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:09,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 124 Invalid, 1689 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1649 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 04:52:09,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-19 04:52:09,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 113. [2021-11-19 04:52:09,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 84 states have (on average 1.2857142857142858) internal successors, (108), 97 states have internal predecessors, (108), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (11), 8 states have call predecessors, (11), 7 states have call successors, (11) [2021-11-19 04:52:09,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 127 transitions. [2021-11-19 04:52:09,265 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 127 transitions. Word has length 56 [2021-11-19 04:52:09,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:09,266 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 127 transitions. [2021-11-19 04:52:09,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 04:52:09,266 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 127 transitions. [2021-11-19 04:52:09,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-19 04:52:09,267 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:09,267 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-19 04:52:09,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-19 04:52:09,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-19 04:52:09,480 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting sll_remove_lastErr13REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:52:09,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:09,480 INFO L85 PathProgramCache]: Analyzing trace with hash -1511395250, now seen corresponding path program 2 times [2021-11-19 04:52:09,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:09,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920468808] [2021-11-19 04:52:09,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:09,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:09,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:09,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:09,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:09,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:52:09,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:10,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:52:10,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:10,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:52:10,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:10,524 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:10,524 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:10,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920468808] [2021-11-19 04:52:10,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920468808] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:10,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476906992] [2021-11-19 04:52:10,524 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 04:52:10,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:10,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:10,532 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:10,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-19 04:52:10,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 04:52:10,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 04:52:10,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-19 04:52:10,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:10,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-19 04:52:10,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-19 04:52:25,786 INFO L354 Elim1Store]: treesize reduction 80, result has 23.8 percent of original size [2021-11-19 04:52:25,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 2 case distinctions, treesize of input 55 treesize of output 55 [2021-11-19 04:52:25,898 INFO L354 Elim1Store]: treesize reduction 80, result has 23.8 percent of original size [2021-11-19 04:52:25,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 2 case distinctions, treesize of input 52 treesize of output 52 [2021-11-19 04:52:26,034 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-19 04:52:26,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-19 04:52:26,538 INFO L354 Elim1Store]: treesize reduction 64, result has 24.7 percent of original size [2021-11-19 04:52:26,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 3 case distinctions, treesize of input 63 treesize of output 69 [2021-11-19 04:52:26,611 INFO L354 Elim1Store]: treesize reduction 92, result has 20.0 percent of original size [2021-11-19 04:52:26,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 3 case distinctions, treesize of input 72 treesize of output 74 [2021-11-19 04:52:29,332 INFO L354 Elim1Store]: treesize reduction 72, result has 4.0 percent of original size [2021-11-19 04:52:29,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 156 treesize of output 74 [2021-11-19 04:52:29,391 INFO L354 Elim1Store]: treesize reduction 44, result has 22.8 percent of original size [2021-11-19 04:52:29,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 47 treesize of output 39 [2021-11-19 04:52:29,580 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:52:29,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:52:34,061 INFO L354 Elim1Store]: treesize reduction 11028, result has 0.0 percent of original size [2021-11-19 04:52:34,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 25 select indices, 25 select index equivalence classes, 0 disjoint index pairs (out of 300 index pairs), introduced 32 new quantified variables, introduced 300 case distinctions, treesize of input 50449568 treesize of output 1 [2021-11-19 04:52:41,406 WARN L838 $PredicateComparison]: unable to prove that (forall ((sll_create_~new_head~0.offset Int) (|main_~#s~0.base| Int) (|v_main_~#s~0.offset_BEFORE_CALL_14| Int)) (let ((.cse7 (+ sll_create_~new_head~0.offset 4))) (let ((.cse0 (store |c_#memory_$Pointer$.base| c_sll_create_~new_head~0.base (store (select |c_#memory_$Pointer$.base| c_sll_create_~new_head~0.base) .cse7 c_sll_create_~head~0.base))) (.cse3 (store |c_#memory_$Pointer$.offset| c_sll_create_~new_head~0.base (store (select |c_#memory_$Pointer$.offset| c_sll_create_~new_head~0.base) .cse7 c_sll_create_~head~0.offset)))) (let ((.cse6 (select (select .cse3 |main_~#s~0.base|) |v_main_~#s~0.offset_BEFORE_CALL_14|)) (.cse4 (select (select .cse0 |main_~#s~0.base|) |v_main_~#s~0.offset_BEFORE_CALL_14|))) (or (let ((.cse5 (+ .cse6 4))) (let ((.cse1 (select (select .cse0 .cse4) .cse5)) (.cse2 (+ 4 (select (select .cse3 .cse4) .cse5)))) (and (= (select (select .cse0 .cse1) .cse2) 0) (= (select (select .cse3 .cse1) .cse2) 0)))) (not (= sll_create_~new_head~0.offset .cse6)) (not (= .cse4 c_sll_create_~new_head~0.base))))))) is different from false [2021-11-19 04:52:43,483 WARN L838 $PredicateComparison]: unable to prove that (forall ((sll_create_~new_head~0.offset Int) (|main_~#s~0.base| Int) (|v_main_~#s~0.offset_BEFORE_CALL_14| Int)) (let ((.cse7 (+ sll_create_~new_head~0.offset 4))) (let ((.cse3 (store |c_#memory_$Pointer$.offset| |c_sll_create_#t~ret5.base| (store (select |c_#memory_$Pointer$.offset| |c_sll_create_#t~ret5.base|) .cse7 c_sll_create_~head~0.offset))) (.cse0 (store |c_#memory_$Pointer$.base| |c_sll_create_#t~ret5.base| (store (select |c_#memory_$Pointer$.base| |c_sll_create_#t~ret5.base|) .cse7 c_sll_create_~head~0.base)))) (let ((.cse4 (select (select .cse0 |main_~#s~0.base|) |v_main_~#s~0.offset_BEFORE_CALL_14|)) (.cse6 (select (select .cse3 |main_~#s~0.base|) |v_main_~#s~0.offset_BEFORE_CALL_14|))) (or (let ((.cse5 (+ .cse6 4))) (let ((.cse1 (select (select .cse0 .cse4) .cse5)) (.cse2 (+ (select (select .cse3 .cse4) .cse5) 4))) (and (= (select (select .cse0 .cse1) .cse2) 0) (= (select (select .cse3 .cse1) .cse2) 0)))) (not (= .cse4 |c_sll_create_#t~ret5.base|)) (not (= sll_create_~new_head~0.offset .cse6))))))) is different from false [2021-11-19 04:52:44,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [476906992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:44,638 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:52:44,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 52 [2021-11-19 04:52:44,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346605361] [2021-11-19 04:52:44,639 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:52:44,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-19 04:52:44,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:44,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-19 04:52:44,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=3861, Unknown=8, NotChecked=250, Total=4290 [2021-11-19 04:52:44,642 INFO L87 Difference]: Start difference. First operand 113 states and 127 transitions. Second operand has 52 states, 51 states have (on average 1.6274509803921569) internal successors, (83), 41 states have internal predecessors, (83), 6 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-19 04:53:10,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:53:10,977 INFO L93 Difference]: Finished difference Result 115 states and 127 transitions. [2021-11-19 04:53:10,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-19 04:53:10,977 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.6274509803921569) internal successors, (83), 41 states have internal predecessors, (83), 6 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) Word has length 56 [2021-11-19 04:53:10,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:53:10,978 INFO L225 Difference]: With dead ends: 115 [2021-11-19 04:53:10,979 INFO L226 Difference]: Without dead ends: 115 [2021-11-19 04:53:10,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1037 ImplicationChecksByTransitivity, 50.9s TimeCoverageRelationStatistics Valid=343, Invalid=6963, Unknown=12, NotChecked=338, Total=7656 [2021-11-19 04:53:10,983 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 164 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 1906 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 2404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 1906 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 450 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:53:10,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 260 Invalid, 2404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 1906 Invalid, 0 Unknown, 450 Unchecked, 4.4s Time] [2021-11-19 04:53:10,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-19 04:53:10,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 113. [2021-11-19 04:53:10,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 84 states have (on average 1.2738095238095237) internal successors, (107), 97 states have internal predecessors, (107), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-19 04:53:10,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 125 transitions. [2021-11-19 04:53:10,989 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 125 transitions. Word has length 56 [2021-11-19 04:53:10,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:53:10,990 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 125 transitions. [2021-11-19 04:53:10,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 1.6274509803921569) internal successors, (83), 41 states have internal predecessors, (83), 6 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-19 04:53:10,990 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 125 transitions. [2021-11-19 04:53:10,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-19 04:53:10,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:53:10,992 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1] [2021-11-19 04:53:11,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-19 04:53:11,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-19 04:53:11,210 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting sll_remove_lastErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:53:11,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:53:11,210 INFO L85 PathProgramCache]: Analyzing trace with hash 1064741010, now seen corresponding path program 1 times [2021-11-19 04:53:11,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:53:11,210 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738395509] [2021-11-19 04:53:11,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:11,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:53:11,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:11,457 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:53:11,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:11,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:53:11,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:11,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:53:11,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:11,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:53:11,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:11,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:53:11,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:11,820 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:53:11,820 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:53:11,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738395509] [2021-11-19 04:53:11,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738395509] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:53:11,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258889113] [2021-11-19 04:53:11,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:11,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:53:11,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:53:11,824 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:53:11,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-19 04:53:11,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:11,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-19 04:53:11,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:53:12,220 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:53:12,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:53:12,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-19 04:53:12,763 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-19 04:53:12,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 10 [2021-11-19 04:53:12,854 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:53:12,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258889113] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:53:12,855 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:53:12,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 14 [2021-11-19 04:53:12,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416778147] [2021-11-19 04:53:12,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:53:12,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 04:53:12,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:53:12,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 04:53:12,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:53:12,857 INFO L87 Difference]: Start difference. First operand 113 states and 125 transitions. Second operand has 15 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 10 states have internal predecessors, (50), 4 states have call successors, (11), 6 states have call predecessors, (11), 2 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-19 04:53:14,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:53:14,658 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2021-11-19 04:53:14,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-19 04:53:14,658 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 10 states have internal predecessors, (50), 4 states have call successors, (11), 6 states have call predecessors, (11), 2 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 57 [2021-11-19 04:53:14,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:53:14,659 INFO L225 Difference]: With dead ends: 115 [2021-11-19 04:53:14,659 INFO L226 Difference]: Without dead ends: 115 [2021-11-19 04:53:14,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-11-19 04:53:14,660 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 255 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-19 04:53:14,661 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 78 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-19 04:53:14,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-19 04:53:14,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-11-19 04:53:14,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 87 states have (on average 1.2183908045977012) internal successors, (106), 99 states have internal predecessors, (106), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-19 04:53:14,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2021-11-19 04:53:14,667 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 57 [2021-11-19 04:53:14,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:53:14,667 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2021-11-19 04:53:14,668 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 10 states have internal predecessors, (50), 4 states have call successors, (11), 6 states have call predecessors, (11), 2 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-19 04:53:14,668 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2021-11-19 04:53:14,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-19 04:53:14,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:53:14,669 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1] [2021-11-19 04:53:14,699 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-19 04:53:14,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:53:14,884 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting sll_remove_lastErr2REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:53:14,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:53:14,884 INFO L85 PathProgramCache]: Analyzing trace with hash -1352767032, now seen corresponding path program 1 times [2021-11-19 04:53:14,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:53:14,884 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348845000] [2021-11-19 04:53:14,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:14,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:53:14,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:14,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:53:14,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:15,060 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:53:15,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:15,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:53:15,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:15,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:53:15,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:16,018 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:53:16,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:17,009 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:53:17,010 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:53:17,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348845000] [2021-11-19 04:53:17,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [348845000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:53:17,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580333052] [2021-11-19 04:53:17,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:17,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:53:17,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:53:17,013 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:53:17,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-19 04:53:17,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:17,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-19 04:53:17,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:53:17,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-19 04:53:18,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2021-11-19 04:53:18,624 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:53:18,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:53:18,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-19 04:53:19,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-19 04:53:20,441 INFO L354 Elim1Store]: treesize reduction 30, result has 3.2 percent of original size [2021-11-19 04:53:20,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 108 treesize of output 1 [2021-11-19 04:53:21,191 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:53:21,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 137 treesize of output 147 [2021-11-19 04:53:21,912 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:53:21,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580333052] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:53:21,913 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:53:21,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 23] total 45 [2021-11-19 04:53:21,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027112010] [2021-11-19 04:53:21,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:53:21,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-19 04:53:21,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:53:21,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-19 04:53:21,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1835, Unknown=0, NotChecked=0, Total=1980 [2021-11-19 04:53:21,915 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand has 45 states, 44 states have (on average 1.75) internal successors, (77), 35 states have internal predecessors, (77), 6 states have call successors, (14), 7 states have call predecessors, (14), 6 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-19 04:53:28,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:53:28,372 INFO L93 Difference]: Finished difference Result 113 states and 121 transitions. [2021-11-19 04:53:28,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-19 04:53:28,373 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.75) internal successors, (77), 35 states have internal predecessors, (77), 6 states have call successors, (14), 7 states have call predecessors, (14), 6 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) Word has length 58 [2021-11-19 04:53:28,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:53:28,373 INFO L225 Difference]: With dead ends: 113 [2021-11-19 04:53:28,374 INFO L226 Difference]: Without dead ends: 106 [2021-11-19 04:53:28,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 618 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=407, Invalid=4285, Unknown=0, NotChecked=0, Total=4692 [2021-11-19 04:53:28,376 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 218 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 1563 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 1931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 1563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 290 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:53:28,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 137 Invalid, 1931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 1563 Invalid, 0 Unknown, 290 Unchecked, 3.5s Time] [2021-11-19 04:53:28,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-19 04:53:28,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2021-11-19 04:53:28,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 79 states have (on average 1.2278481012658229) internal successors, (97), 91 states have internal predecessors, (97), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:53:28,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2021-11-19 04:53:28,382 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 58 [2021-11-19 04:53:28,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:53:28,383 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2021-11-19 04:53:28,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 1.75) internal successors, (77), 35 states have internal predecessors, (77), 6 states have call successors, (14), 7 states have call predecessors, (14), 6 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-19 04:53:28,383 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2021-11-19 04:53:28,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-19 04:53:28,384 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:53:28,384 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:53:28,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-19 04:53:28,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-19 04:53:28,604 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting sll_remove_lastErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:53:28,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:53:28,604 INFO L85 PathProgramCache]: Analyzing trace with hash 847585833, now seen corresponding path program 1 times [2021-11-19 04:53:28,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:53:28,604 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160475998] [2021-11-19 04:53:28,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:28,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:53:28,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:28,801 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:53:28,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:28,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:53:28,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:28,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:53:28,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:28,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:53:28,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:28,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:53:28,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:29,414 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:53:29,414 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:53:29,414 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160475998] [2021-11-19 04:53:29,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160475998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:53:29,414 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217913541] [2021-11-19 04:53:29,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:29,415 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:53:29,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:53:29,416 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:53:29,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-19 04:53:29,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:29,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-19 04:53:29,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:53:29,592 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 [2021-11-19 04:53:30,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-19 04:53:30,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-19 04:53:30,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-11-19 04:53:30,795 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-19 04:53:30,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-19 04:53:31,257 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-19 04:53:31,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2021-11-19 04:53:33,671 INFO L354 Elim1Store]: treesize reduction 25, result has 47.9 percent of original size [2021-11-19 04:53:33,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 46 [2021-11-19 04:53:33,951 INFO L354 Elim1Store]: treesize reduction 30, result has 9.1 percent of original size [2021-11-19 04:53:33,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 97 treesize of output 49 [2021-11-19 04:53:33,961 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-19 04:53:33,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 30 [2021-11-19 04:53:34,581 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:53:34,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:53:35,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2021-11-19 04:53:37,719 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:53:37,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 35 [2021-11-19 04:53:38,305 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:53:38,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 57 [2021-11-19 04:53:39,609 INFO L354 Elim1Store]: treesize reduction 88, result has 52.4 percent of original size [2021-11-19 04:53:39,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 1 disjoint index pairs (out of 36 index pairs), introduced 10 new quantified variables, introduced 35 case distinctions, treesize of input 5848 treesize of output 5640 [2021-11-19 04:53:47,263 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_main_~#s~0.base_BEFORE_CALL_20| Int) (|v_main_~#s~0.offset_BEFORE_CALL_27| Int)) (let ((.cse2 (+ c_sll_create_~new_head~0.offset 4))) (let ((.cse3 (store |c_#memory_$Pointer$.base| c_sll_create_~new_head~0.base (store (select |c_#memory_$Pointer$.base| c_sll_create_~new_head~0.base) .cse2 c_sll_create_~head~0.base)))) (let ((.cse0 (select (select .cse3 |v_main_~#s~0.base_BEFORE_CALL_20|) |v_main_~#s~0.offset_BEFORE_CALL_27|))) (let ((.cse1 (select (select .cse3 .cse0) .cse2))) (or (not (= .cse0 c_sll_create_~new_head~0.base)) (= 0 .cse1) (not (= |v_main_~#s~0.base_BEFORE_CALL_20| .cse1)) (and (not (= c_sll_create_~new_head~0.offset 0)) (= |v_main_~#s~0.base_BEFORE_CALL_20| .cse0) (= .cse2 |v_main_~#s~0.offset_BEFORE_CALL_27|)) (= (select |c_old(#valid)| |v_main_~#s~0.base_BEFORE_CALL_20|) 0))))))) is different from false [2021-11-19 04:53:49,615 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_main_~#s~0.base_BEFORE_CALL_20| Int) (|v_main_~#s~0.offset_BEFORE_CALL_27| Int)) (let ((.cse1 (+ |c_sll_create_#t~ret5.offset| 4))) (let ((.cse3 (store |c_#memory_$Pointer$.base| |c_sll_create_#t~ret5.base| (store (select |c_#memory_$Pointer$.base| |c_sll_create_#t~ret5.base|) .cse1 c_sll_create_~head~0.base)))) (let ((.cse2 (select (select .cse3 |v_main_~#s~0.base_BEFORE_CALL_20|) |v_main_~#s~0.offset_BEFORE_CALL_27|))) (let ((.cse0 (select (select .cse3 .cse2) .cse1))) (or (= .cse0 0) (not (= .cse0 |v_main_~#s~0.base_BEFORE_CALL_20|)) (and (= .cse1 |v_main_~#s~0.offset_BEFORE_CALL_27|) (not (= |c_sll_create_#t~ret5.offset| 0)) (= .cse2 |v_main_~#s~0.base_BEFORE_CALL_20|)) (not (= .cse2 |c_sll_create_#t~ret5.base|)) (= (select |c_old(#valid)| |v_main_~#s~0.base_BEFORE_CALL_20|) 0))))))) is different from false [2021-11-19 04:53:49,986 INFO L354 Elim1Store]: treesize reduction 44, result has 52.7 percent of original size [2021-11-19 04:53:49,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 21429 treesize of output 20489 [2021-11-19 04:53:50,425 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-19 04:53:50,426 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-19 04:53:50,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-19 04:53:50,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140205176] [2021-11-19 04:53:50,426 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-19 04:53:50,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-19 04:53:50,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:53:50,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-19 04:53:50,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=3555, Unknown=2, NotChecked=242, Total=4032 [2021-11-19 04:53:50,428 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 14 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 11 states have internal predecessors, (41), 3 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 04:53:52,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:53:52,753 INFO L93 Difference]: Finished difference Result 104 states and 112 transitions. [2021-11-19 04:53:52,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-19 04:53:52,753 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 11 states have internal predecessors, (41), 3 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 64 [2021-11-19 04:53:52,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:53:52,754 INFO L225 Difference]: With dead ends: 104 [2021-11-19 04:53:52,754 INFO L226 Difference]: Without dead ends: 104 [2021-11-19 04:53:52,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1107 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=333, Invalid=4785, Unknown=2, NotChecked=282, Total=5402 [2021-11-19 04:53:52,755 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 169 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 04:53:52,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 65 Invalid, 432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 04:53:52,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-19 04:53:52,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 96. [2021-11-19 04:53:52,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 73 states have (on average 1.2054794520547945) internal successors, (88), 83 states have internal predecessors, (88), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-19 04:53:52,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2021-11-19 04:53:52,760 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 64 [2021-11-19 04:53:52,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:53:52,761 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2021-11-19 04:53:52,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 11 states have internal predecessors, (41), 3 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 04:53:52,761 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2021-11-19 04:53:52,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-19 04:53:52,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:53:52,762 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:53:52,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-19 04:53:52,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-19 04:53:52,972 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting sll_remove_lastErr2REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:53:52,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:53:52,972 INFO L85 PathProgramCache]: Analyzing trace with hash 505357104, now seen corresponding path program 1 times [2021-11-19 04:53:52,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:53:52,972 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609142014] [2021-11-19 04:53:52,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:52,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:53:52,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:53,382 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:53:53,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:53,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:53:53,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:54,375 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:53:54,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:54,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:53:54,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:55,097 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:53:55,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:58,198 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:53:58,199 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:53:58,199 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609142014] [2021-11-19 04:53:58,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609142014] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:53:58,199 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986618348] [2021-11-19 04:53:58,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:58,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:53:58,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:53:58,200 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:53:58,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-19 04:53:58,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:58,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-19 04:53:58,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:53:59,430 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 [2021-11-19 04:54:00,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-19 04:54:13,046 INFO L354 Elim1Store]: treesize reduction 80, result has 29.8 percent of original size [2021-11-19 04:54:13,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 64 treesize of output 72 [2021-11-19 04:54:13,078 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-19 04:54:13,078 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 1 case distinctions, treesize of input 83 treesize of output 85 [2021-11-19 04:54:15,088 INFO L354 Elim1Store]: treesize reduction 39, result has 23.5 percent of original size [2021-11-19 04:54:15,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 78 treesize of output 55 [2021-11-19 04:54:15,454 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:54:15,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:54:46,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986618348] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:54:46,109 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:54:46,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 30] total 65 [2021-11-19 04:54:46,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055200060] [2021-11-19 04:54:46,110 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:54:46,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-19 04:54:46,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:54:46,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-19 04:54:46,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=4238, Unknown=15, NotChecked=0, Total=4422 [2021-11-19 04:54:46,112 INFO L87 Difference]: Start difference. First operand 96 states and 101 transitions. Second operand has 66 states, 63 states have (on average 1.6507936507936507) internal successors, (104), 54 states have internal predecessors, (104), 9 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:55:18,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:55:18,061 INFO L93 Difference]: Finished difference Result 145 states and 158 transitions. [2021-11-19 04:55:18,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-19 04:55:18,062 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 63 states have (on average 1.6507936507936507) internal successors, (104), 54 states have internal predecessors, (104), 9 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) Word has length 65 [2021-11-19 04:55:18,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:55:18,063 INFO L225 Difference]: With dead ends: 145 [2021-11-19 04:55:18,063 INFO L226 Difference]: Without dead ends: 145 [2021-11-19 04:55:18,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2072 ImplicationChecksByTransitivity, 73.3s TimeCoverageRelationStatistics Valid=826, Invalid=11590, Unknown=16, NotChecked=0, Total=12432 [2021-11-19 04:55:18,066 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 319 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 3477 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 4275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 3477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 667 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:55:18,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 434 Invalid, 4275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 3477 Invalid, 0 Unknown, 667 Unchecked, 8.2s Time] [2021-11-19 04:55:18,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-19 04:55:18,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 116. [2021-11-19 04:55:18,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 91 states have (on average 1.2857142857142858) internal successors, (117), 102 states have internal predecessors, (117), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-19 04:55:18,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 133 transitions. [2021-11-19 04:55:18,074 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 133 transitions. Word has length 65 [2021-11-19 04:55:18,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:55:18,074 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 133 transitions. [2021-11-19 04:55:18,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 63 states have (on average 1.6507936507936507) internal successors, (104), 54 states have internal predecessors, (104), 9 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:55:18,075 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 133 transitions. [2021-11-19 04:55:18,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-19 04:55:18,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:55:18,076 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:55:18,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-19 04:55:18,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:55:18,302 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting sll_remove_lastErr3REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:55:18,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:55:18,302 INFO L85 PathProgramCache]: Analyzing trace with hash 505357105, now seen corresponding path program 1 times [2021-11-19 04:55:18,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:55:18,302 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574209833] [2021-11-19 04:55:18,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:55:18,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:55:18,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:18,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:55:18,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:18,759 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:55:18,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:19,118 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:55:19,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:19,123 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:55:19,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:19,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:55:19,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:20,128 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:55:20,128 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:55:20,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574209833] [2021-11-19 04:55:20,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574209833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:55:20,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422587006] [2021-11-19 04:55:20,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:55:20,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:55:20,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:55:20,130 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:55:20,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-19 04:55:20,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:20,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-19 04:55:20,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:55:23,026 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-19 04:55:23,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 58 treesize of output 63 [2021-11-19 04:55:24,580 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-11-19 04:55:24,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 83 treesize of output 70 [2021-11-19 04:55:25,696 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-19 04:55:25,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 51 [2021-11-19 04:55:25,705 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-19 04:55:25,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 27 [2021-11-19 04:55:25,892 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:55:25,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:55:26,917 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:55:26,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 91 [2021-11-19 04:55:26,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 118 treesize of output 102 [2021-11-19 04:55:38,416 WARN L227 SmtUtils]: Spent 10.04s on a formula simplification that was a NOOP. DAG size: 34 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-19 04:55:43,473 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:55:43,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 70 [2021-11-19 04:56:21,083 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:56:21,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 110 treesize of output 101 [2021-11-19 04:56:33,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2021-11-19 04:56:34,667 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:56:34,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422587006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:56:34,667 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:56:34,667 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 59 [2021-11-19 04:56:34,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970629532] [2021-11-19 04:56:34,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:56:34,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-19 04:56:34,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:34,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-19 04:56:34,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=3319, Unknown=19, NotChecked=0, Total=3540 [2021-11-19 04:56:34,669 INFO L87 Difference]: Start difference. First operand 116 states and 133 transitions. Second operand has 60 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 47 states have internal predecessors, (117), 10 states have call successors, (14), 9 states have call predecessors, (14), 8 states have return successors, (10), 9 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-19 04:57:29,862 WARN L227 SmtUtils]: Spent 16.18s on a formula simplification. DAG size of input: 93 DAG size of output: 59 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-19 04:57:49,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:57:49,336 INFO L93 Difference]: Finished difference Result 177 states and 204 transitions. [2021-11-19 04:57:49,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-19 04:57:49,336 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 47 states have internal predecessors, (117), 10 states have call successors, (14), 9 states have call predecessors, (14), 8 states have return successors, (10), 9 states have call predecessors, (10), 7 states have call successors, (10) Word has length 65 [2021-11-19 04:57:49,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:57:49,338 INFO L225 Difference]: With dead ends: 177 [2021-11-19 04:57:49,338 INFO L226 Difference]: Without dead ends: 177 [2021-11-19 04:57:49,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1927 ImplicationChecksByTransitivity, 139.5s TimeCoverageRelationStatistics Valid=983, Invalid=9901, Unknown=36, NotChecked=0, Total=10920 [2021-11-19 04:57:49,341 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 454 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 2283 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 455 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 3230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 2283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 869 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2021-11-19 04:57:49,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [455 Valid, 251 Invalid, 3230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 2283 Invalid, 0 Unknown, 869 Unchecked, 5.9s Time] [2021-11-19 04:57:49,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-11-19 04:57:49,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 137. [2021-11-19 04:57:49,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 109 states have (on average 1.311926605504587) internal successors, (143), 121 states have internal predecessors, (143), 9 states have call successors, (9), 8 states have call predecessors, (9), 8 states have return successors, (13), 7 states have call predecessors, (13), 8 states have call successors, (13) [2021-11-19 04:57:49,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 165 transitions. [2021-11-19 04:57:49,349 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 165 transitions. Word has length 65 [2021-11-19 04:57:49,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:57:49,349 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 165 transitions. [2021-11-19 04:57:49,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 47 states have internal predecessors, (117), 10 states have call successors, (14), 9 states have call predecessors, (14), 8 states have return successors, (10), 9 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-19 04:57:49,350 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 165 transitions. [2021-11-19 04:57:49,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-19 04:57:49,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:57:49,351 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1] [2021-11-19 04:57:49,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-19 04:57:49,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:57:49,564 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting sll_remove_lastErr14REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:57:49,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:57:49,564 INFO L85 PathProgramCache]: Analyzing trace with hash -425868681, now seen corresponding path program 1 times [2021-11-19 04:57:49,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:57:49,564 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828505800] [2021-11-19 04:57:49,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:57:49,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:57:49,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:50,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:57:50,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:50,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:57:50,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:50,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:57:50,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:50,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:57:50,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:50,991 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:57:50,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:51,809 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:57:51,809 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:57:51,809 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828505800] [2021-11-19 04:57:51,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828505800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:57:51,809 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534093615] [2021-11-19 04:57:51,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:57:51,810 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:57:51,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:57:51,811 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:57:51,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-19 04:57:51,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:51,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 04:57:51,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:57:52,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 31 [2021-11-19 04:57:52,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2021-11-19 04:57:52,619 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-19 04:57:52,619 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-19 04:57:52,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534093615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:57:52,619 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-19 04:57:52,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [25] total 29 [2021-11-19 04:57:52,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014542277] [2021-11-19 04:57:52,620 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:57:52,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 04:57:52,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:57:52,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 04:57:52,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=800, Unknown=0, NotChecked=0, Total=870 [2021-11-19 04:57:52,621 INFO L87 Difference]: Start difference. First operand 137 states and 165 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 6 states have internal predecessors, (43), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:57:53,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:57:53,197 INFO L93 Difference]: Finished difference Result 139 states and 167 transitions. [2021-11-19 04:57:53,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-19 04:57:53,199 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 6 states have internal predecessors, (43), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 69 [2021-11-19 04:57:53,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:57:53,201 INFO L225 Difference]: With dead ends: 139 [2021-11-19 04:57:53,201 INFO L226 Difference]: Without dead ends: 139 [2021-11-19 04:57:53,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=82, Invalid=974, Unknown=0, NotChecked=0, Total=1056 [2021-11-19 04:57:53,202 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 32 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:57:53,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 193 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 04:57:53,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-19 04:57:53,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 137. [2021-11-19 04:57:53,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 109 states have (on average 1.2935779816513762) internal successors, (141), 121 states have internal predecessors, (141), 9 states have call successors, (9), 8 states have call predecessors, (9), 8 states have return successors, (13), 7 states have call predecessors, (13), 8 states have call successors, (13) [2021-11-19 04:57:53,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 163 transitions. [2021-11-19 04:57:53,211 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 163 transitions. Word has length 69 [2021-11-19 04:57:53,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:57:53,212 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 163 transitions. [2021-11-19 04:57:53,212 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 6 states have internal predecessors, (43), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:57:53,212 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 163 transitions. [2021-11-19 04:57:53,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-19 04:57:53,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:57:53,213 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:57:53,247 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-19 04:57:53,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-19 04:57:53,427 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting sll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:57:53,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:57:53,427 INFO L85 PathProgramCache]: Analyzing trace with hash -426299631, now seen corresponding path program 1 times [2021-11-19 04:57:53,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:57:53,427 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107944264] [2021-11-19 04:57:53,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:57:53,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:57:53,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:53,779 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:57:53,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:53,848 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:57:53,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:54,141 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:57:54,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:54,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:57:54,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:54,407 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:57:54,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:55,034 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:57:55,035 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:57:55,035 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107944264] [2021-11-19 04:57:55,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107944264] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:57:55,035 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803824025] [2021-11-19 04:57:55,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:57:55,036 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:57:55,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:57:55,040 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:57:55,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-19 04:57:55,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:57:55,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-19 04:57:55,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:57:55,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-19 04:57:58,234 WARN L860 $PredicateComparison]: unable to prove that (exists ((sll_remove_last_~snd_to_last~0.offset Int) (sll_remove_last_~snd_to_last~0.base Int)) (and (<= sll_remove_last_~snd_to_last~0.base (select (select |c_old(#memory_$Pointer$.base)| |c_sll_remove_last_#in~head.base|) |c_sll_remove_last_#in~head.offset|)) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| sll_remove_last_~snd_to_last~0.base (store (select |c_old(#memory_$Pointer$.base)| sll_remove_last_~snd_to_last~0.base) (+ sll_remove_last_~snd_to_last~0.offset 4) 0))))) is different from true [2021-11-19 04:57:58,368 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-11-19 04:57:58,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 30 treesize of output 25 [2021-11-19 04:57:59,178 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-19 04:57:59,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 18 [2021-11-19 04:57:59,196 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:57:59,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:58:01,561 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_sll_remove_last_~snd_to_last~0.offset_35 Int) (v_sll_remove_last_~snd_to_last~0.base_36 Int)) (or (<= (+ (select (select (store |c_#memory_$Pointer$.base| v_sll_remove_last_~snd_to_last~0.base_36 (store (select |c_#memory_$Pointer$.base| v_sll_remove_last_~snd_to_last~0.base_36) (+ v_sll_remove_last_~snd_to_last~0.offset_35 4) 0)) |c_main_~#s~0.base|) |c_main_~#s~0.offset|) 1) |c_#StackHeapBarrier|) (< (select (select |c_#memory_$Pointer$.base| |c_main_~#s~0.base|) |c_main_~#s~0.offset|) v_sll_remove_last_~snd_to_last~0.base_36))) is different from false [2021-11-19 04:58:01,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803824025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:58:01,565 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:58:01,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 31 [2021-11-19 04:58:01,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97096929] [2021-11-19 04:58:01,565 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:58:01,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-19 04:58:01,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:58:01,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-19 04:58:01,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=841, Unknown=2, NotChecked=118, Total=1056 [2021-11-19 04:58:01,566 INFO L87 Difference]: Start difference. First operand 137 states and 163 transitions. Second operand has 32 states, 29 states have (on average 2.793103448275862) internal successors, (81), 23 states have internal predecessors, (81), 7 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-19 04:58:47,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:58:47,277 INFO L93 Difference]: Finished difference Result 170 states and 198 transitions. [2021-11-19 04:58:47,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-19 04:58:47,277 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 2.793103448275862) internal successors, (81), 23 states have internal predecessors, (81), 7 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 69 [2021-11-19 04:58:47,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:58:47,279 INFO L225 Difference]: With dead ends: 170 [2021-11-19 04:58:47,279 INFO L226 Difference]: Without dead ends: 170 [2021-11-19 04:58:47,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 75 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 826 ImplicationChecksByTransitivity, 48.4s TimeCoverageRelationStatistics Valid=433, Invalid=3585, Unknown=22, NotChecked=250, Total=4290 [2021-11-19 04:58:47,281 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 250 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 1513 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 1963 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 389 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-19 04:58:47,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [251 Valid, 219 Invalid, 1963 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1513 Invalid, 0 Unknown, 389 Unchecked, 3.7s Time] [2021-11-19 04:58:47,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-19 04:58:47,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 141. [2021-11-19 04:58:47,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 113 states have (on average 1.2920353982300885) internal successors, (146), 125 states have internal predecessors, (146), 9 states have call successors, (9), 8 states have call predecessors, (9), 8 states have return successors, (13), 7 states have call predecessors, (13), 8 states have call successors, (13) [2021-11-19 04:58:47,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 168 transitions. [2021-11-19 04:58:47,289 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 168 transitions. Word has length 69 [2021-11-19 04:58:47,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:58:47,290 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 168 transitions. [2021-11-19 04:58:47,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 2.793103448275862) internal successors, (81), 23 states have internal predecessors, (81), 7 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-19 04:58:47,290 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 168 transitions. [2021-11-19 04:58:47,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-19 04:58:47,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:58:47,291 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1] [2021-11-19 04:58:47,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-19 04:58:47,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-19 04:58:47,504 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting sll_remove_lastErr17REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:58:47,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:58:47,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1237907392, now seen corresponding path program 1 times [2021-11-19 04:58:47,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:58:47,504 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765486521] [2021-11-19 04:58:47,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:58:47,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:58:47,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:48,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:58:48,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:48,145 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:58:48,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:48,505 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:58:48,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:48,509 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:58:48,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:48,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:58:48,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:49,727 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 19 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:58:49,727 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:58:49,728 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765486521] [2021-11-19 04:58:49,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765486521] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:58:49,728 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254570598] [2021-11-19 04:58:49,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:58:49,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:58:49,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:58:49,729 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:58:49,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-19 04:58:49,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:49,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-19 04:58:49,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:58:51,053 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:58:51,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 57 [2021-11-19 04:58:51,080 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:58:51,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 44 [2021-11-19 04:58:51,257 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-19 04:58:51,257 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-19 04:58:51,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254570598] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:58:51,258 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-19 04:58:51,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [24] total 30 [2021-11-19 04:58:51,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3873969] [2021-11-19 04:58:51,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:58:51,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:58:51,259 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:58:51,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:58:51,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=812, Unknown=0, NotChecked=0, Total=870 [2021-11-19 04:58:51,260 INFO L87 Difference]: Start difference. First operand 141 states and 168 transitions. Second operand has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:58:51,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:58:51,641 INFO L93 Difference]: Finished difference Result 132 states and 152 transitions. [2021-11-19 04:58:51,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-19 04:58:51,642 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 71 [2021-11-19 04:58:51,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:58:51,643 INFO L225 Difference]: With dead ends: 132 [2021-11-19 04:58:51,643 INFO L226 Difference]: Without dead ends: 132 [2021-11-19 04:58:51,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=66, Invalid=926, Unknown=0, NotChecked=0, Total=992 [2021-11-19 04:58:51,644 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 4 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:58:51,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 330 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 43 Unchecked, 0.2s Time] [2021-11-19 04:58:51,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-19 04:58:51,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2021-11-19 04:58:51,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 107 states have (on average 1.233644859813084) internal successors, (132), 116 states have internal predecessors, (132), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-19 04:58:51,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 152 transitions. [2021-11-19 04:58:51,652 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 152 transitions. Word has length 71 [2021-11-19 04:58:51,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:58:51,653 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 152 transitions. [2021-11-19 04:58:51,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-19 04:58:51,653 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 152 transitions. [2021-11-19 04:58:51,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-19 04:58:51,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:58:51,654 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-19 04:58:51,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-19 04:58:51,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-19 04:58:51,880 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting sll_remove_lastErr13REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:58:51,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:58:51,880 INFO L85 PathProgramCache]: Analyzing trace with hash 76993196, now seen corresponding path program 1 times [2021-11-19 04:58:51,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:58:51,880 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127458609] [2021-11-19 04:58:51,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:58:51,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:58:51,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:52,569 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:58:52,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:52,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:58:52,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:53,026 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:58:53,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:53,040 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:58:53,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:53,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:58:53,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:54,345 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 17 proven. 14 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:58:54,345 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:58:54,345 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127458609] [2021-11-19 04:58:54,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127458609] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:58:54,345 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313069446] [2021-11-19 04:58:54,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:58:54,346 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:58:54,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:58:54,347 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:58:54,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-19 04:58:54,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:58:54,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-19 04:58:54,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:58:57,027 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-11-19 04:58:57,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 57 [2021-11-19 04:58:57,494 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-19 04:58:57,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 42 [2021-11-19 04:58:58,794 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-19 04:58:58,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 41 [2021-11-19 04:58:58,802 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-19 04:58:58,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 20 [2021-11-19 04:58:58,994 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 19 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:58:58,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:59:00,349 INFO L354 Elim1Store]: treesize reduction 14, result has 54.8 percent of original size [2021-11-19 04:59:00,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 272 treesize of output 214 [2021-11-19 04:59:00,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 126 [2021-11-19 04:59:20,805 WARN L227 SmtUtils]: Spent 20.04s on a formula simplification. DAG size of input: 28 DAG size of output: 20 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-19 04:59:20,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313069446] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:59:20,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:59:20,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23] total 46 [2021-11-19 04:59:20,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843794327] [2021-11-19 04:59:20,806 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:59:20,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-19 04:59:20,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:59:20,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-19 04:59:20,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2516, Unknown=0, NotChecked=0, Total=2652 [2021-11-19 04:59:20,808 INFO L87 Difference]: Start difference. First operand 132 states and 152 transitions. Second operand has 46 states, 44 states have (on average 2.409090909090909) internal successors, (106), 36 states have internal predecessors, (106), 7 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-19 04:59:32,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:59:32,224 INFO L93 Difference]: Finished difference Result 121 states and 126 transitions. [2021-11-19 04:59:32,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-19 04:59:32,224 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 44 states have (on average 2.409090909090909) internal successors, (106), 36 states have internal predecessors, (106), 7 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) Word has length 73 [2021-11-19 04:59:32,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:59:32,226 INFO L225 Difference]: With dead ends: 121 [2021-11-19 04:59:32,226 INFO L226 Difference]: Without dead ends: 117 [2021-11-19 04:59:32,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 753 ImplicationChecksByTransitivity, 32.3s TimeCoverageRelationStatistics Valid=463, Invalid=5699, Unknown=0, NotChecked=0, Total=6162 [2021-11-19 04:59:32,227 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 289 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 2389 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 2658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 2389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 183 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:59:32,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [289 Valid, 147 Invalid, 2658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 2389 Invalid, 0 Unknown, 183 Unchecked, 5.6s Time] [2021-11-19 04:59:32,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-19 04:59:32,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 111. [2021-11-19 04:59:32,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 88 states have (on average 1.1818181818181819) internal successors, (104), 97 states have internal predecessors, (104), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-19 04:59:32,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 120 transitions. [2021-11-19 04:59:32,233 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 120 transitions. Word has length 73 [2021-11-19 04:59:32,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:59:32,234 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 120 transitions. [2021-11-19 04:59:32,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 44 states have (on average 2.409090909090909) internal successors, (106), 36 states have internal predecessors, (106), 7 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-19 04:59:32,234 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 120 transitions. [2021-11-19 04:59:32,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-19 04:59:32,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:59:32,236 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:59:32,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-19 04:59:32,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-19 04:59:32,448 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting sll_remove_lastErr2REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:59:32,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:59:32,448 INFO L85 PathProgramCache]: Analyzing trace with hash -1579565988, now seen corresponding path program 1 times [2021-11-19 04:59:32,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:59:32,448 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527433999] [2021-11-19 04:59:32,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:59:32,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:59:32,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:32,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:59:32,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:32,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:59:32,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:32,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:59:32,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:32,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:59:32,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:32,754 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:59:32,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:32,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-11-19 04:59:32,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:32,768 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-19 04:59:32,769 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:59:32,769 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527433999] [2021-11-19 04:59:32,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [527433999] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:59:32,769 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:59:32,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-19 04:59:32,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449885203] [2021-11-19 04:59:32,770 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:59:32,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-19 04:59:32,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:59:32,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-19 04:59:32,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-19 04:59:32,771 INFO L87 Difference]: Start difference. First operand 111 states and 120 transitions. Second operand has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 6 states have internal predecessors, (49), 5 states have call successors, (7), 5 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-19 04:59:33,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:59:33,554 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2021-11-19 04:59:33,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:59:33,554 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 6 states have internal predecessors, (49), 5 states have call successors, (7), 5 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 79 [2021-11-19 04:59:33,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:59:33,555 INFO L225 Difference]: With dead ends: 74 [2021-11-19 04:59:33,555 INFO L226 Difference]: Without dead ends: 74 [2021-11-19 04:59:33,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2021-11-19 04:59:33,556 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 93 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:59:33,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 70 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 04:59:33,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-19 04:59:33,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-11-19 04:59:33,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 61 states have internal predecessors, (61), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-19 04:59:33,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2021-11-19 04:59:33,560 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 79 [2021-11-19 04:59:33,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:59:33,560 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2021-11-19 04:59:33,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 6 states have internal predecessors, (49), 5 states have call successors, (7), 5 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-19 04:59:33,561 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2021-11-19 04:59:33,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-19 04:59:33,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:59:33,562 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:59:33,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-11-19 04:59:33,562 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:59:33,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:59:33,563 INFO L85 PathProgramCache]: Analyzing trace with hash 364550607, now seen corresponding path program 1 times [2021-11-19 04:59:33,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:59:33,563 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913310873] [2021-11-19 04:59:33,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:59:33,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:59:33,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:33,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:59:33,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:33,759 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:59:33,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:33,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:59:33,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:33,773 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:59:33,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:33,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:59:33,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:33,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-11-19 04:59:33,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:33,977 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-19 04:59:33,977 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:59:33,977 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913310873] [2021-11-19 04:59:33,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913310873] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:59:33,977 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:59:33,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-19 04:59:33,978 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080094814] [2021-11-19 04:59:33,978 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:59:33,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-19 04:59:33,978 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:59:33,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-19 04:59:33,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-19 04:59:33,979 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 6 states have internal predecessors, (52), 1 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:59:35,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:59:35,037 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2021-11-19 04:59:35,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 04:59:35,038 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 6 states have internal predecessors, (52), 1 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 78 [2021-11-19 04:59:35,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:59:35,038 INFO L225 Difference]: With dead ends: 72 [2021-11-19 04:59:35,038 INFO L226 Difference]: Without dead ends: 72 [2021-11-19 04:59:35,039 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:59:35,039 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 73 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 04:59:35,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 60 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 04:59:35,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-19 04:59:35,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-11-19 04:59:35,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 59 states have (on average 1.0) internal successors, (59), 59 states have internal predecessors, (59), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-19 04:59:35,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2021-11-19 04:59:35,042 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 78 [2021-11-19 04:59:35,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:59:35,042 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2021-11-19 04:59:35,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 6 states have internal predecessors, (52), 1 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:59:35,043 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2021-11-19 04:59:35,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-19 04:59:35,043 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:59:35,043 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:59:35,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-11-19 04:59:35,044 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting mainErr3ENSURES_VIOLATIONMEMORY_LEAK === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-11-19 04:59:35,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:59:35,044 INFO L85 PathProgramCache]: Analyzing trace with hash 364550672, now seen corresponding path program 1 times [2021-11-19 04:59:35,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:59:35,044 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274566697] [2021-11-19 04:59:35,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:59:35,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:59:35,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:35,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:59:35,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:35,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:59:35,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:36,829 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-19 04:59:36,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:37,323 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-19 04:59:37,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:37,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:59:37,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:40,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-11-19 04:59:40,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:41,047 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 6 proven. 20 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 04:59:41,047 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:59:41,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274566697] [2021-11-19 04:59:41,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1274566697] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:59:41,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100090894] [2021-11-19 04:59:41,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:59:41,048 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:59:41,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:59:41,048 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:59:41,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-19 04:59:41,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:41,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-19 04:59:41,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:59:41,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-19 04:59:43,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 44 [2021-11-19 04:59:53,582 INFO L354 Elim1Store]: treesize reduction 80, result has 29.2 percent of original size [2021-11-19 04:59:53,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 182 treesize of output 113 [2021-11-19 04:59:53,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 127 treesize of output 119 [2021-11-19 04:59:56,995 INFO L354 Elim1Store]: treesize reduction 33, result has 26.7 percent of original size [2021-11-19 04:59:56,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 127 treesize of output 102 [2021-11-19 04:59:58,523 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:59:58,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:59:58,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-19 05:00:03,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100090894] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 05:00:03,274 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 05:00:03,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 34] total 64 [2021-11-19 05:00:03,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734322678] [2021-11-19 05:00:03,274 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 05:00:03,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-19 05:00:03,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 05:00:03,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-19 05:00:03,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=4893, Unknown=1, NotChecked=0, Total=5112 [2021-11-19 05:00:03,276 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand has 65 states, 62 states have (on average 1.9838709677419355) internal successors, (123), 54 states have internal predecessors, (123), 10 states have call successors, (13), 7 states have call predecessors, (13), 10 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-19 05:00:35,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 05:00:35,674 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2021-11-19 05:00:35,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-19 05:00:35,675 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 62 states have (on average 1.9838709677419355) internal successors, (123), 54 states have internal predecessors, (123), 10 states have call successors, (13), 7 states have call predecessors, (13), 10 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) Word has length 78 [2021-11-19 05:00:35,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 05:00:35,675 INFO L225 Difference]: With dead ends: 71 [2021-11-19 05:00:35,675 INFO L226 Difference]: Without dead ends: 0 [2021-11-19 05:00:35,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 70 SyntacticMatches, 4 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1713 ImplicationChecksByTransitivity, 47.8s TimeCoverageRelationStatistics Valid=527, Invalid=9369, Unknown=4, NotChecked=0, Total=9900 [2021-11-19 05:00:35,676 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 140 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 2137 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 2473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 2137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 278 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2021-11-19 05:00:35,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 236 Invalid, 2473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 2137 Invalid, 0 Unknown, 278 Unchecked, 6.0s Time] [2021-11-19 05:00:35,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-19 05:00:35,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-19 05:00:35,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 05:00:35,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-19 05:00:35,677 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 78 [2021-11-19 05:00:35,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 05:00:35,677 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-19 05:00:35,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 62 states have (on average 1.9838709677419355) internal successors, (123), 54 states have internal predecessors, (123), 10 states have call successors, (13), 7 states have call predecessors, (13), 10 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-19 05:00:35,678 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-19 05:00:35,678 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-19 05:00:35,681 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_createErr0REQUIRES_VIOLATION (31 of 32 remaining) [2021-11-19 05:00:35,682 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_createErr1REQUIRES_VIOLATION (30 of 32 remaining) [2021-11-19 05:00:35,682 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr0REQUIRES_VIOLATION (29 of 32 remaining) [2021-11-19 05:00:35,682 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr1REQUIRES_VIOLATION (28 of 32 remaining) [2021-11-19 05:00:35,682 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr2REQUIRES_VIOLATION (27 of 32 remaining) [2021-11-19 05:00:35,682 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr3REQUIRES_VIOLATION (26 of 32 remaining) [2021-11-19 05:00:35,683 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr0REQUIRES_VIOLATION (25 of 32 remaining) [2021-11-19 05:00:35,683 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr1REQUIRES_VIOLATION (24 of 32 remaining) [2021-11-19 05:00:35,683 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr2ASSERT_VIOLATIONMEMORY_LEAK (23 of 32 remaining) [2021-11-19 05:00:35,683 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr3ENSURES_VIOLATIONMEMORY_LEAK (22 of 32 remaining) [2021-11-19 05:00:35,684 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr0REQUIRES_VIOLATION (21 of 32 remaining) [2021-11-19 05:00:35,684 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr1REQUIRES_VIOLATION (20 of 32 remaining) [2021-11-19 05:00:35,684 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr2REQUIRES_VIOLATION (19 of 32 remaining) [2021-11-19 05:00:35,684 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr3REQUIRES_VIOLATION (18 of 32 remaining) [2021-11-19 05:00:35,684 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr4REQUIRES_VIOLATION (17 of 32 remaining) [2021-11-19 05:00:35,685 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr5REQUIRES_VIOLATION (16 of 32 remaining) [2021-11-19 05:00:35,685 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE (15 of 32 remaining) [2021-11-19 05:00:35,685 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE (14 of 32 remaining) [2021-11-19 05:00:35,685 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE (13 of 32 remaining) [2021-11-19 05:00:35,685 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr9REQUIRES_VIOLATION (12 of 32 remaining) [2021-11-19 05:00:35,686 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr10REQUIRES_VIOLATION (11 of 32 remaining) [2021-11-19 05:00:35,686 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr11REQUIRES_VIOLATION (10 of 32 remaining) [2021-11-19 05:00:35,686 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr12REQUIRES_VIOLATION (9 of 32 remaining) [2021-11-19 05:00:35,686 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr13REQUIRES_VIOLATION (8 of 32 remaining) [2021-11-19 05:00:35,686 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr14REQUIRES_VIOLATION (7 of 32 remaining) [2021-11-19 05:00:35,687 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr15REQUIRES_VIOLATION (6 of 32 remaining) [2021-11-19 05:00:35,687 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr16REQUIRES_VIOLATION (5 of 32 remaining) [2021-11-19 05:00:35,687 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr17REQUIRES_VIOLATION (4 of 32 remaining) [2021-11-19 05:00:35,687 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr18REQUIRES_VIOLATION (3 of 32 remaining) [2021-11-19 05:00:35,687 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr19ASSERT_VIOLATIONMEMORY_FREE (2 of 32 remaining) [2021-11-19 05:00:35,688 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE (1 of 32 remaining) [2021-11-19 05:00:35,688 INFO L764 garLoopResultBuilder]: Registering result SAFE for location sll_remove_lastErr21ASSERT_VIOLATIONMEMORY_FREE (0 of 32 remaining) [2021-11-19 05:00:35,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-19 05:00:35,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 05:00:35,906 INFO L732 BasicCegarLoop]: Path program histogram: [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 05:00:35,908 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-19 05:00:35,910 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.11 05:00:35 BoogieIcfgContainer [2021-11-19 05:00:35,910 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-19 05:00:35,911 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-19 05:00:35,911 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-19 05:00:35,911 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-19 05:00:35,911 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:50:28" (3/4) ... [2021-11-19 05:00:35,913 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-19 05:00:35,920 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure reach_error [2021-11-19 05:00:35,920 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2021-11-19 05:00:35,920 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure myexit [2021-11-19 05:00:35,920 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure sll_remove_last [2021-11-19 05:00:35,920 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2021-11-19 05:00:35,921 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2021-11-19 05:00:35,921 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure sll_create [2021-11-19 05:00:35,921 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2021-11-19 05:00:35,921 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure node_create [2021-11-19 05:00:35,927 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 17 nodes and edges [2021-11-19 05:00:35,927 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2021-11-19 05:00:35,927 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-11-19 05:00:35,928 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-19 05:00:35,979 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/witness.graphml [2021-11-19 05:00:35,979 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-19 05:00:35,980 INFO L158 Benchmark]: Toolchain (without parser) took 608795.60ms. Allocated memory was 88.1MB in the beginning and 192.9MB in the end (delta: 104.9MB). Free memory was 49.9MB in the beginning and 129.4MB in the end (delta: -79.6MB). Peak memory consumption was 24.5MB. Max. memory is 16.1GB. [2021-11-19 05:00:35,980 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 88.1MB. Free memory was 67.7MB in the beginning and 67.6MB in the end (delta: 42.8kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-19 05:00:35,980 INFO L158 Benchmark]: CACSL2BoogieTranslator took 531.07ms. Allocated memory was 88.1MB in the beginning and 107.0MB in the end (delta: 18.9MB). Free memory was 49.7MB in the beginning and 75.4MB in the end (delta: -25.8MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-19 05:00:35,985 INFO L158 Benchmark]: Boogie Preprocessor took 64.98ms. Allocated memory is still 107.0MB. Free memory was 75.4MB in the beginning and 72.6MB in the end (delta: 2.8MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-19 05:00:35,991 INFO L158 Benchmark]: RCFGBuilder took 790.10ms. Allocated memory is still 107.0MB. Free memory was 72.6MB in the beginning and 49.5MB in the end (delta: 23.1MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. [2021-11-19 05:00:35,992 INFO L158 Benchmark]: TraceAbstraction took 607334.76ms. Allocated memory was 107.0MB in the beginning and 192.9MB in the end (delta: 86.0MB). Free memory was 48.8MB in the beginning and 134.4MB in the end (delta: -85.6MB). Peak memory consumption was 3.6MB. Max. memory is 16.1GB. [2021-11-19 05:00:35,992 INFO L158 Benchmark]: Witness Printer took 68.79ms. Allocated memory is still 192.9MB. Free memory was 133.4MB in the beginning and 129.4MB in the end (delta: 3.9MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-19 05:00:35,993 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 88.1MB. Free memory was 67.7MB in the beginning and 67.6MB in the end (delta: 42.8kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 531.07ms. Allocated memory was 88.1MB in the beginning and 107.0MB in the end (delta: 18.9MB). Free memory was 49.7MB in the beginning and 75.4MB in the end (delta: -25.8MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Preprocessor took 64.98ms. Allocated memory is still 107.0MB. Free memory was 75.4MB in the beginning and 72.6MB in the end (delta: 2.8MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * RCFGBuilder took 790.10ms. Allocated memory is still 107.0MB. Free memory was 72.6MB in the beginning and 49.5MB in the end (delta: 23.1MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. * TraceAbstraction took 607334.76ms. Allocated memory was 107.0MB in the beginning and 192.9MB in the end (delta: 86.0MB). Free memory was 48.8MB in the beginning and 134.4MB in the end (delta: -85.6MB). Peak memory consumption was 3.6MB. Max. memory is 16.1GB. * Witness Printer took 68.79ms. Allocated memory is still 192.9MB. Free memory was 133.4MB in the beginning and 129.4MB in the end (delta: 3.9MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 587]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 587]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 579]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 579]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 615]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 615]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 619]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 607]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 594]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 594]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 595]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 595]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 598]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 598]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 599]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 599]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 601]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 601]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 603]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 603]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 604]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 604]: free always succeeds For all program executions holds that free always succeeds at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 10 procedures, 101 locations, 32 error locations. Started 1 CEGAR loops. OverallTime: 607.3s, OverallIterations: 41, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.1s, AutomataDifference: 255.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 6751 SdHoareTripleChecker+Valid, 52.6s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 6688 mSDsluCounter, 5454 SdHoareTripleChecker+Invalid, 48.1s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 4247 IncrementalHoareTripleChecker+Unchecked, 3471 mSDsCounter, 1448 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 34763 IncrementalHoareTripleChecker+Invalid, 40458 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 1448 mSolverCounterUnsat, 1983 mSDtfsCounter, 34763 mSolverCounterSat, 0.3s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 3300 GetRequests, 1814 SyntacticMatches, 25 SemanticMatches, 1461 ConstructedPredicates, 6 IntricatePredicates, 1 DeprecatedPredicates, 14337 ImplicationChecksByTransitivity, 492.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=141occurred in iteration=36, InterpolantAutomatonStates: 717, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 41 MinimizatonAttempts, 340 StatesRemovedByMinimization, 28 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.4s SsaConstructionTime, 1.2s SatisfiabilityAnalysisTime, 268.3s InterpolantComputationTime, 3218 NumberOfCodeBlocks, 3218 NumberOfCodeBlocksAsserted, 63 NumberOfCheckSat, 3576 ConstructedInterpolants, 153 QuantifiedInterpolants, 34488 SizeOfPredicates, 244 NumberOfNonLiveVariables, 6274 ConjunctsInSsa, 814 ConjunctsInUnsatCore, 69 InterpolantComputations, 23 PerfectInterpolantSequences, 897/1269 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 32 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-11-19 05:00:36,209 WARN L435 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process [2021-11-19 05:00:36,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9d4c854-6e16-4091-b14f-e18fb4ee83ef/bin/uautomizer-ZXIjhQolGL/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 137 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE