./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3340815bef7e21ae2d4803d7059577c1761bb3b7b4bb24b2b34d5d0d0054fd10 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:32:38,884 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:32:38,886 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:32:38,936 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:32:38,936 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:32:38,937 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:32:38,939 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:32:38,942 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:32:38,944 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:32:38,945 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:32:38,947 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:32:38,948 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:32:38,949 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:32:38,950 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:32:38,951 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:32:38,953 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:32:38,954 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:32:38,955 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:32:38,958 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:32:38,960 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:32:38,962 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:32:38,964 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:32:38,965 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:32:38,967 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:32:38,970 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:32:38,971 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:32:38,971 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:32:38,973 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:32:38,973 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:32:38,975 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:32:38,975 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:32:38,976 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:32:38,977 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:32:38,978 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:32:38,979 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:32:38,980 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:32:38,980 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:32:38,981 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:32:38,981 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:32:38,982 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:32:38,983 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:32:38,984 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:32:39,010 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:32:39,011 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:32:39,012 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:32:39,012 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:32:39,013 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:32:39,013 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:32:39,014 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:32:39,014 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:32:39,015 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:32:39,015 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:32:39,015 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:32:39,016 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:32:39,016 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:32:39,017 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:32:39,017 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:32:39,017 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:32:39,018 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:32:39,018 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:32:39,019 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:32:39,029 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:32:39,029 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:32:39,030 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:32:39,030 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:32:39,031 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:32:39,031 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:32:39,032 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:32:39,032 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:32:39,032 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:32:39,033 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:32:39,033 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:32:39,034 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:32:39,034 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:32:39,035 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:32:39,035 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:32:39,036 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:32:39,036 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:32:39,036 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:32:39,037 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:32:39,037 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:32:39,038 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:32:39,038 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:32:39,039 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3340815bef7e21ae2d4803d7059577c1761bb3b7b4bb24b2b34d5d0d0054fd10 [2021-11-23 03:32:39,345 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:32:39,378 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:32:39,382 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:32:39,384 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:32:39,385 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:32:39,387 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i [2021-11-23 03:32:39,473 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/data/f7d31aff9/dfcf4244a15145538160810941dd2f82/FLAGca97af2dc [2021-11-23 03:32:40,041 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:32:40,041 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i [2021-11-23 03:32:40,068 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/data/f7d31aff9/dfcf4244a15145538160810941dd2f82/FLAGca97af2dc [2021-11-23 03:32:40,322 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/data/f7d31aff9/dfcf4244a15145538160810941dd2f82 [2021-11-23 03:32:40,327 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:32:40,329 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:32:40,331 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:32:40,331 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:32:40,336 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:32:40,337 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,338 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22badf4a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40, skipping insertion in model container [2021-11-23 03:32:40,338 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,345 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:32:40,398 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:32:40,746 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_3360a003-f304-4763-9090-7e1de6ad48bb/sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i[24151,24164] [2021-11-23 03:32:40,755 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:32:40,768 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:32:40,822 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_3360a003-f304-4763-9090-7e1de6ad48bb/sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i[24151,24164] [2021-11-23 03:32:40,823 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:32:40,857 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:32:40,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40 WrapperNode [2021-11-23 03:32:40,858 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:32:40,859 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:32:40,859 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:32:40,860 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:32:40,869 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,886 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,914 INFO L137 Inliner]: procedures = 126, calls = 36, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 119 [2021-11-23 03:32:40,914 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:32:40,915 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:32:40,916 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:32:40,916 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:32:40,925 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,926 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,931 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,931 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,940 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,944 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,947 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,951 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:32:40,952 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:32:40,953 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:32:40,953 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:32:40,954 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (1/1) ... [2021-11-23 03:32:40,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:32:40,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:41,013 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:32:41,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:32:41,066 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 03:32:41,067 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-11-23 03:32:41,067 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-11-23 03:32:41,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 03:32:41,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:32:41,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 03:32:41,068 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 03:32:41,068 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 03:32:41,068 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 03:32:41,068 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 03:32:41,068 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:32:41,069 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:32:41,069 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:32:41,204 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:32:41,206 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:32:41,425 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:32:41,463 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:32:41,464 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-23 03:32:41,466 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:32:41 BoogieIcfgContainer [2021-11-23 03:32:41,467 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:32:41,469 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:32:41,469 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:32:41,477 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:32:41,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:32:40" (1/3) ... [2021-11-23 03:32:41,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61bec544 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:32:41, skipping insertion in model container [2021-11-23 03:32:41,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:32:40" (2/3) ... [2021-11-23 03:32:41,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61bec544 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:32:41, skipping insertion in model container [2021-11-23 03:32:41,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:32:41" (3/3) ... [2021-11-23 03:32:41,481 INFO L111 eAbstractionObserver]: Analyzing ICFG sll2c_remove_all_reverse.i [2021-11-23 03:32:41,488 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:32:41,490 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:32:41,553 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:32:41,562 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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 [2021-11-23 03:32:41,562 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:32:41,582 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:32:41,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 03:32:41,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:41,596 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:41,597 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:41,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:41,609 INFO L85 PathProgramCache]: Analyzing trace with hash 980108759, now seen corresponding path program 1 times [2021-11-23 03:32:41,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:41,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442796468] [2021-11-23 03:32:41,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:41,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:41,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:41,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:32:41,881 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:41,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442796468] [2021-11-23 03:32:41,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442796468] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:41,883 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:32:41,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:32:41,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650851068] [2021-11-23 03:32:41,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:41,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:32:41,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:41,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:32:41,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:32:41,928 INFO L87 Difference]: Start difference. First operand has 24 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:32:41,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:41,998 INFO L93 Difference]: Finished difference Result 41 states and 58 transitions. [2021-11-23 03:32:41,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:32:42,001 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-11-23 03:32:42,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:42,010 INFO L225 Difference]: With dead ends: 41 [2021-11-23 03:32:42,010 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 03:32:42,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:32:42,018 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:42,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 43 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:32:42,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 03:32:42,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2021-11-23 03:32:42,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:32:42,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-23 03:32:42,062 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 10 [2021-11-23 03:32:42,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:42,063 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-23 03:32:42,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:32:42,064 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-23 03:32:42,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 03:32:42,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:42,066 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:42,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:32:42,066 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:42,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:42,068 INFO L85 PathProgramCache]: Analyzing trace with hash -1677954359, now seen corresponding path program 1 times [2021-11-23 03:32:42,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:42,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836531694] [2021-11-23 03:32:42,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:42,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:42,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:42,185 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:32:42,185 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:42,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836531694] [2021-11-23 03:32:42,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836531694] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:42,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:32:42,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:32:42,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018234018] [2021-11-23 03:32:42,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:42,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:32:42,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:42,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:32:42,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:32:42,190 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:32:42,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:42,247 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-11-23 03:32:42,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:32:42,247 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 16 [2021-11-23 03:32:42,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:42,249 INFO L225 Difference]: With dead ends: 34 [2021-11-23 03:32:42,249 INFO L226 Difference]: Without dead ends: 31 [2021-11-23 03:32:42,250 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:32:42,251 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 27 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:42,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 41 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:32:42,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-23 03:32:42,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2021-11-23 03:32:42,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:32:42,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-11-23 03:32:42,273 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 16 [2021-11-23 03:32:42,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:42,273 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-11-23 03:32:42,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:32:42,274 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-11-23 03:32:42,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 03:32:42,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:42,276 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:42,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:32:42,277 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:42,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:42,279 INFO L85 PathProgramCache]: Analyzing trace with hash 1516062603, now seen corresponding path program 1 times [2021-11-23 03:32:42,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:42,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068078543] [2021-11-23 03:32:42,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:42,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:42,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:42,461 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:32:42,461 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:42,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068078543] [2021-11-23 03:32:42,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068078543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:42,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369318604] [2021-11-23 03:32:42,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:42,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:42,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:42,465 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:42,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:32:42,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:42,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:32:42,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:42,886 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:32:42,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:32:43,038 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:32:43,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369318604] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:32:43,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1823229041] [2021-11-23 03:32:43,077 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 03:32:43,077 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:32:43,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:32:43,089 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:32:43,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:32:43,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:43,242 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 03:32:43,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 03:32:43,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:43,294 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:32:43,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:32:43,409 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:32:43,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-23 03:32:43,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:43,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2021-11-23 03:32:43,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:43,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2021-11-23 03:32:43,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:43,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2021-11-23 03:32:43,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:43,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-11-23 03:32:43,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:43,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-11-23 03:32:43,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:43,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-11-23 03:32:43,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:43,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-11-23 03:32:44,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 9 treesize of output 3 [2021-11-23 03:32:44,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:32:44,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:32:44,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:32:44,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:32:44,375 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,378 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,388 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,391 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,393 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:32:44,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:32:44,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:32:44,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 9 treesize of output 3 [2021-11-23 03:32:44,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:32:44,858 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,861 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,863 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,866 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,871 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:44,948 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 19 treesize of output 11 [2021-11-23 03:32:44,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2021-11-23 03:32:44,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:44,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-11-23 03:32:45,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:45,297 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 168 treesize of output 152 [2021-11-23 03:32:45,312 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:32:45,313 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 153 treesize of output 141 [2021-11-23 03:32:45,330 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:32:45,334 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 134 treesize of output 122 [2021-11-23 03:32:45,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:32:45,692 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 11 treesize of output 7 [2021-11-23 03:32:45,709 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 11 treesize of output 7 [2021-11-23 03:32:45,833 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:32:45,855 INFO L354 Elim1Store]: treesize reduction 72, result has 17.2 percent of original size [2021-11-23 03:32:45,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 44 treesize of output 34 [2021-11-23 03:32:45,881 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:32:45,882 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:32:45,909 INFO L354 Elim1Store]: treesize reduction 48, result has 32.4 percent of original size [2021-11-23 03:32:45,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 54 treesize of output 48 [2021-11-23 03:32:45,920 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 39 treesize of output 38 [2021-11-23 03:32:45,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:32:46,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:32:46,291 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:32:46,342 INFO L354 Elim1Store]: treesize reduction 132, result has 14.3 percent of original size [2021-11-23 03:32:46,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 12 case distinctions, treesize of input 131 treesize of output 120 [2021-11-23 03:32:46,362 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:32:46,415 INFO L354 Elim1Store]: treesize reduction 132, result has 14.3 percent of original size [2021-11-23 03:32:46,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 12 case distinctions, treesize of input 108 treesize of output 97 [2021-11-23 03:32:46,444 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 03:32:46,449 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 82 treesize of output 84 [2021-11-23 03:32:46,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:32:46,643 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:32:46,644 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 2 case distinctions, treesize of input 30 treesize of output 21 [2021-11-23 03:32:46,680 INFO L354 Elim1Store]: treesize reduction 29, result has 34.1 percent of original size [2021-11-23 03:32:46,682 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 2 case distinctions, treesize of input 40 treesize of output 35 [2021-11-23 03:32:46,692 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 29 treesize of output 28 [2021-11-23 03:32:46,939 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 67 for LOIs [2021-11-23 03:32:47,289 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:32:53,431 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '339#(and (<= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (or (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0))) (<= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_circular_create_~last~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_~data#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~head~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_#in~data#1|) (<= |ULTIMATE.start_main_~len~0#1| |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_circular_create_~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_circular_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-23 03:32:53,431 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:32:53,432 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:32:53,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2021-11-23 03:32:53,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894018842] [2021-11-23 03:32:53,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:32:53,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:32:53,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:53,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:32:53,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:32:53,437 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:32:53,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:53,501 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2021-11-23 03:32:53,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:32:53,502 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 22 [2021-11-23 03:32:53,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:53,503 INFO L225 Difference]: With dead ends: 35 [2021-11-23 03:32:53,504 INFO L226 Difference]: Without dead ends: 32 [2021-11-23 03:32:53,505 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:32:53,506 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 98 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:53,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 56 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:32:53,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-23 03:32:53,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-23 03:32:53,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:32:53,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-11-23 03:32:53,515 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 22 [2021-11-23 03:32:53,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:53,516 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-11-23 03:32:53,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:32:53,517 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-11-23 03:32:53,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 03:32:53,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:53,518 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:53,546 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 03:32:53,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-23 03:32:53,732 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:53,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:53,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1874328883, now seen corresponding path program 2 times [2021-11-23 03:32:53,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:53,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877950418] [2021-11-23 03:32:53,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:53,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:53,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:53,887 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:32:53,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:53,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877950418] [2021-11-23 03:32:53,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877950418] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:53,888 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:32:53,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:32:53,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955607857] [2021-11-23 03:32:53,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:53,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:32:53,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:53,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:32:53,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:32:53,892 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:32:54,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:54,010 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2021-11-23 03:32:54,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:32:54,011 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2021-11-23 03:32:54,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:54,016 INFO L225 Difference]: With dead ends: 46 [2021-11-23 03:32:54,016 INFO L226 Difference]: Without dead ends: 32 [2021-11-23 03:32:54,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:32:54,023 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 22 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:54,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 54 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:32:54,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-23 03:32:54,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-23 03:32:54,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 28 states have internal predecessors, (34), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:32:54,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-11-23 03:32:54,055 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 28 [2021-11-23 03:32:54,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:54,056 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-11-23 03:32:54,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:32:54,057 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-11-23 03:32:54,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 03:32:54,060 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:54,060 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:54,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:32:54,061 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:54,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:54,062 INFO L85 PathProgramCache]: Analyzing trace with hash 2022697385, now seen corresponding path program 1 times [2021-11-23 03:32:54,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:54,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345983027] [2021-11-23 03:32:54,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:54,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:54,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:54,177 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:32:54,178 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:54,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345983027] [2021-11-23 03:32:54,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [345983027] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:54,179 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:32:54,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:32:54,179 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071347921] [2021-11-23 03:32:54,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:54,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:32:54,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:54,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:32:54,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:32:54,182 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:32:54,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:54,244 INFO L93 Difference]: Finished difference Result 57 states and 68 transitions. [2021-11-23 03:32:54,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:32:54,245 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 34 [2021-11-23 03:32:54,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:54,246 INFO L225 Difference]: With dead ends: 57 [2021-11-23 03:32:54,246 INFO L226 Difference]: Without dead ends: 36 [2021-11-23 03:32:54,247 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 [2021-11-23 03:32:54,248 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 1 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:54,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 39 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:32:54,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-23 03:32:54,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-23 03:32:54,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:32:54,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-11-23 03:32:54,256 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 34 [2021-11-23 03:32:54,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:54,256 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-11-23 03:32:54,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:32:54,257 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-11-23 03:32:54,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 03:32:54,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:54,259 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:54,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:32:54,259 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:54,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:54,260 INFO L85 PathProgramCache]: Analyzing trace with hash -839211383, now seen corresponding path program 1 times [2021-11-23 03:32:54,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:54,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403850078] [2021-11-23 03:32:54,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:54,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:54,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:54,702 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:32:54,703 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:54,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403850078] [2021-11-23 03:32:54,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1403850078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:54,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226716110] [2021-11-23 03:32:54,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:54,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:54,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:54,708 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:54,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:32:54,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:54,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-23 03:32:54,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:55,454 INFO L354 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2021-11-23 03:32:55,455 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 71 treesize of output 53 [2021-11-23 03:32:55,473 INFO L354 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2021-11-23 03:32:55,473 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 63 treesize of output 49 [2021-11-23 03:32:56,774 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:32:56,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:32:57,542 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:32:57,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226716110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:32:57,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2044443485] [2021-11-23 03:32:57,548 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-23 03:32:57,549 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:32:57,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:32:57,549 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:32:57,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:32:57,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:57,590 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 03:32:57,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 03:32:57,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:57,613 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:32:57,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:32:57,645 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:32:57,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-23 03:32:57,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:57,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2021-11-23 03:32:57,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:57,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2021-11-23 03:32:57,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:57,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2021-11-23 03:32:57,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:57,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-11-23 03:32:57,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:57,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-11-23 03:32:57,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:57,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-11-23 03:32:57,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:57,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-11-23 03:32:58,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:32:58,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:32:58,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 9 treesize of output 3 [2021-11-23 03:32:58,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:32:58,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-23 03:32:58,142 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,144 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,146 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,149 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,151 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:32:58,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:32:58,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:32:58,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 9 treesize of output 3 [2021-11-23 03:32:58,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:32:58,453 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,455 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,459 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,461 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,464 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:32:58,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2021-11-23 03:32:58,533 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 19 treesize of output 11 [2021-11-23 03:32:58,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:58,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-11-23 03:32:58,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:32:58,749 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 18 treesize of output 14 [2021-11-23 03:32:58,760 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 11 treesize of output 7 [2021-11-23 03:32:59,014 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 11 treesize of output 7 [2021-11-23 03:32:59,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:32:59,031 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 11 treesize of output 7 [2021-11-23 03:32:59,197 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 [2021-11-23 03:32:59,226 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-23 03:32:59,226 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 2 case distinctions, treesize of input 76 treesize of output 72 [2021-11-23 03:32:59,244 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:32:59,245 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 2 case distinctions, treesize of input 74 treesize of output 61 [2021-11-23 03:32:59,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:32:59,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:32:59,882 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-23 03:32:59,882 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 2 case distinctions, treesize of input 76 treesize of output 72 [2021-11-23 03:32:59,903 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:32:59,903 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 2 case distinctions, treesize of input 66 treesize of output 53 [2021-11-23 03:32:59,915 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 [2021-11-23 03:33:00,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:33:00,103 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-23 03:33:00,104 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 2 case distinctions, treesize of input 76 treesize of output 72 [2021-11-23 03:33:00,127 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:33:00,127 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 2 case distinctions, treesize of input 66 treesize of output 53 [2021-11-23 03:33:00,144 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 [2021-11-23 03:33:00,696 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 67 for LOIs [2021-11-23 03:33:00,948 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:33:08,880 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '962#(and (<= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (or (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0))) (<= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_circular_create_~last~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_~data#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~head~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_#in~data#1|) (<= |ULTIMATE.start_main_~len~0#1| |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_circular_create_~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_circular_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-23 03:33:08,881 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:33:08,881 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:33:08,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 11] total 38 [2021-11-23 03:33:08,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388309720] [2021-11-23 03:33:08,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:33:08,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 03:33:08,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:33:08,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 03:33:08,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=2667, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 03:33:08,886 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 38 states, 36 states have (on average 2.3055555555555554) internal successors, (83), 36 states have internal predecessors, (83), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:33:09,952 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse7 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse4 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse6 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_remove_last_~head#1.base|) |c_ULTIMATE.start_sll_circular_remove_last_~head#1.offset|)) (.cse5 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_remove_last_~head#1.base|) |c_ULTIMATE.start_sll_circular_remove_last_~head#1.offset|))) (and (< |c_#StackHeapBarrier| |c_ULTIMATE.start_main_~#s~0#1.base|) (forall ((|ULTIMATE.start_sll_circular_remove_last_~last~1#1.offset| Int)) (let ((.cse3 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_remove_last_~last~1#1.base|) |ULTIMATE.start_sll_circular_remove_last_~last~1#1.offset|)) (.cse2 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_remove_last_~head#1.base|) |c_ULTIMATE.start_sll_circular_remove_last_~head#1.offset|)) (.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_remove_last_~last~1#1.base|) |ULTIMATE.start_sll_circular_remove_last_~last~1#1.offset|)) (.cse1 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_remove_last_~head#1.base|) |c_ULTIMATE.start_sll_circular_remove_last_~head#1.offset|))) (or (not (= .cse0 (select (select |c_#memory_$Pointer$.base| .cse1) .cse2))) (not (= .cse3 (select (select |c_#memory_$Pointer$.offset| .cse1) .cse2))) (and (= .cse3 .cse2) (= .cse0 .cse1))))) (= |c_ULTIMATE.start_sll_circular_remove_last_~head#1.base| |c_ULTIMATE.start_main_~#s~0#1.base|) (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (< (+ |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| 1) |c_ULTIMATE.start_main_~#s~0#1.base|) (= .cse4 0) (= |c_ULTIMATE.start_sll_circular_remove_last_~snd_to_last~0#1.offset| .cse5) (= |c_ULTIMATE.start_sll_circular_remove_last_~snd_to_last~0#1.base| .cse6) (< (+ .cse7 1) |c_ULTIMATE.start_main_~#s~0#1.base|) (= |c_ULTIMATE.start_main_~#s~0#1.offset| 0) (= (select (select |c_#memory_$Pointer$.base| .cse7) .cse4) .cse7) (= .cse4 (select (select |c_#memory_$Pointer$.offset| .cse7) .cse4)) (or (and (= |c_ULTIMATE.start_sll_circular_remove_last_~last~1#1.base| .cse6) (= .cse5 |c_ULTIMATE.start_sll_circular_remove_last_~last~1#1.offset|)) (not (= |c_ULTIMATE.start_sll_circular_remove_last_~last~1#1.base| (select (select |c_#memory_$Pointer$.base| .cse6) .cse5))) (not (= (select (select |c_#memory_$Pointer$.offset| .cse6) .cse5) |c_ULTIMATE.start_sll_circular_remove_last_~last~1#1.offset|))) (= |c_ULTIMATE.start_sll_circular_remove_last_~head#1.offset| |c_ULTIMATE.start_main_~#s~0#1.offset|))) is different from false [2021-11-23 03:33:10,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:33:10,189 INFO L93 Difference]: Finished difference Result 67 states and 78 transitions. [2021-11-23 03:33:10,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:33:10,190 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 2.3055555555555554) internal successors, (83), 36 states have internal predecessors, (83), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) Word has length 38 [2021-11-23 03:33:10,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:33:10,191 INFO L225 Difference]: With dead ends: 67 [2021-11-23 03:33:10,191 INFO L226 Difference]: Without dead ends: 48 [2021-11-23 03:33:10,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 67 SyntacticMatches, 7 SemanticMatches, 65 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1315 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=452, Invalid=3841, Unknown=1, NotChecked=128, Total=4422 [2021-11-23 03:33:10,194 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 85 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:33:10,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 259 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 374 Invalid, 0 Unknown, 23 Unchecked, 0.4s Time] [2021-11-23 03:33:10,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-23 03:33:10,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2021-11-23 03:33:10,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 39 states have internal predecessors, (46), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:33:10,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2021-11-23 03:33:10,203 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 38 [2021-11-23 03:33:10,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:33:10,204 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2021-11-23 03:33:10,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 36 states have (on average 2.3055555555555554) internal successors, (83), 36 states have internal predecessors, (83), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:33:10,204 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2021-11-23 03:33:10,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 03:33:10,206 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:33:10,206 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:33:10,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:33:10,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:10,424 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:33:10,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:33:10,424 INFO L85 PathProgramCache]: Analyzing trace with hash -2061942610, now seen corresponding path program 1 times [2021-11-23 03:33:10,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:33:10,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003690180] [2021-11-23 03:33:10,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:10,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:33:10,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:10,527 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:33:10,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:33:10,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003690180] [2021-11-23 03:33:10,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003690180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:33:10,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386688023] [2021-11-23 03:33:10,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:10,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:10,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:33:10,532 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:33:10,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:33:10,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:10,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 03:33:10,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:10,733 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 03:33:10,733 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 61 treesize of output 48 [2021-11-23 03:33:10,742 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 03:33:10,743 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 42 treesize of output 37 [2021-11-23 03:33:10,777 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:33:10,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:10,883 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:33:10,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386688023] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:33:10,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1609480644] [2021-11-23 03:33:10,890 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-23 03:33:10,890 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:33:10,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:33:10,891 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:33:10,891 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:33:10,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:10,930 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 03:33:10,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 03:33:10,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:10,954 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:33:10,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:33:10,986 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 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:33:10,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-23 03:33:11,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:11,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2021-11-23 03:33:11,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:11,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2021-11-23 03:33:11,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:11,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2021-11-23 03:33:11,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:11,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-11-23 03:33:11,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:11,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-11-23 03:33:11,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:11,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-11-23 03:33:11,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:11,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-11-23 03:33:11,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:33:11,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:33:11,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:33:11,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-23 03:33:11,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:33:11,382 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,384 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,386 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,390 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,393 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:33:11,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:33:11,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2021-11-23 03:33:11,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:33:11,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-23 03:33:11,644 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,646 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,648 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,651 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,653 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 03:33:11,697 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 19 treesize of output 11 [2021-11-23 03:33:11,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:11,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-11-23 03:33:11,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2021-11-23 03:33:11,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:33:11,904 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 168 treesize of output 152 [2021-11-23 03:33:11,911 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:33:11,912 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 153 treesize of output 141 [2021-11-23 03:33:11,922 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:33:11,923 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 146 treesize of output 134 [2021-11-23 03:33:12,169 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 11 treesize of output 7 [2021-11-23 03:33:12,177 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 11 treesize of output 7 [2021-11-23 03:33:12,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:33:12,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:33:12,438 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-23 03:33:12,438 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 2 case distinctions, treesize of input 23 treesize of output 30 [2021-11-23 03:33:12,477 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-23 03:33:12,478 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 2 case distinctions, treesize of input 23 treesize of output 30 [2021-11-23 03:33:12,489 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 [2021-11-23 03:33:13,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:33:13,627 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-23 03:33:13,628 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 2 case distinctions, treesize of input 23 treesize of output 30 [2021-11-23 03:33:13,637 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 [2021-11-23 03:33:13,664 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-23 03:33:13,664 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 2 case distinctions, treesize of input 23 treesize of output 30 [2021-11-23 03:33:13,894 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-23 03:33:13,894 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 2 case distinctions, treesize of input 23 treesize of output 30 [2021-11-23 03:33:13,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:33:13,915 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 [2021-11-23 03:33:13,948 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-23 03:33:13,948 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 2 case distinctions, treesize of input 23 treesize of output 30 [2021-11-23 03:33:14,598 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 67 for LOIs [2021-11-23 03:33:14,829 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:33:21,167 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1400#(and (<= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (or (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0))) (<= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_circular_create_~last~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_~data#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~head~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_#in~data#1|) (<= |ULTIMATE.start_main_~len~0#1| |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_circular_create_~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_circular_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-23 03:33:21,167 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:33:21,168 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:33:21,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2021-11-23 03:33:21,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967734716] [2021-11-23 03:33:21,168 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:33:21,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:33:21,169 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:33:21,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:33:21,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:33:21,170 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:33:21,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:33:21,287 INFO L93 Difference]: Finished difference Result 79 states and 93 transitions. [2021-11-23 03:33:21,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:33:21,289 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 40 [2021-11-23 03:33:21,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:33:21,290 INFO L225 Difference]: With dead ends: 79 [2021-11-23 03:33:21,290 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 03:33:21,291 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 96 SyntacticMatches, 6 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:33:21,292 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 1 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:33:21,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 66 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 0 Unknown, 1 Unchecked, 0.1s Time] [2021-11-23 03:33:21,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 03:33:21,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-23 03:33:21,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 47 states have internal predecessors, (55), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:33:21,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2021-11-23 03:33:21,301 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 40 [2021-11-23 03:33:21,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:33:21,302 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2021-11-23 03:33:21,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:33:21,302 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2021-11-23 03:33:21,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 03:33:21,304 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:33:21,304 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:33:21,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:33:21,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:21,517 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:33:21,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:33:21,518 INFO L85 PathProgramCache]: Analyzing trace with hash 737673907, now seen corresponding path program 2 times [2021-11-23 03:33:21,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:33:21,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618844837] [2021-11-23 03:33:21,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:21,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:33:21,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:22,363 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 21 proven. 11 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:33:22,363 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:33:22,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618844837] [2021-11-23 03:33:22,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618844837] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:33:22,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712909444] [2021-11-23 03:33:22,364 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:33:22,364 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:22,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:33:22,368 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:33:22,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3360a003-f304-4763-9090-7e1de6ad48bb/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:33:22,705 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 03:33:22,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:33:22,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-23 03:33:22,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:22,738 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 [2021-11-23 03:33:22,929 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-23 03:33:22,930 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 [2021-11-23 03:33:22,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:33:22,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:33:23,074 INFO L354 Elim1Store]: treesize reduction 33, result has 25.0 percent of original size [2021-11-23 03:33:23,074 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 86 treesize of output 56 [2021-11-23 03:33:23,084 INFO L354 Elim1Store]: treesize reduction 45, result has 19.6 percent of original size [2021-11-23 03:33:23,084 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 74 treesize of output 65 [2021-11-23 03:33:23,965 INFO L354 Elim1Store]: treesize reduction 165, result has 10.8 percent of original size [2021-11-23 03:33:23,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 10 new quantified variables, introduced 15 case distinctions, treesize of input 149 treesize of output 96 [2021-11-23 03:33:24,035 INFO L354 Elim1Store]: treesize reduction 118, result has 26.7 percent of original size [2021-11-23 03:33:24,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 8 new quantified variables, introduced 15 case distinctions, treesize of input 61 treesize of output 81 [2021-11-23 03:33:24,143 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 25 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:33:24,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:25,999 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~#s~0#1.base| Int)) (let ((.cse1 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| (store (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base|) |c_ULTIMATE.start_sll_circular_create_~last~0#1.offset| |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|))) (.cse4 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| (store (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base|) |c_ULTIMATE.start_sll_circular_create_~last~0#1.offset| |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|)))) (let ((.cse5 (select (select .cse4 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse0 (select (select .cse1 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (not (= .cse0 (let ((.cse2 (select (select .cse1 .cse0) .cse5)) (.cse3 (select (select .cse4 .cse0) .cse5))) (select (select .cse1 (select (select .cse1 .cse2) .cse3)) (select (select .cse4 .cse2) .cse3))))) (not (= .cse5 |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|)) (not (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| .cse0)))))) is different from false [2021-11-23 03:34:13,820 WARN L227 SmtUtils]: Spent 47.67s on a formula simplification. DAG size of input: 2636 DAG size of output: 1183 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-23 03:34:13,833 INFO L354 Elim1Store]: treesize reduction 40171, result has 34.0 percent of original size [2021-11-23 03:34:13,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 40 select indices, 40 select index equivalence classes, 0 disjoint index pairs (out of 780 index pairs), introduced 59 new quantified variables, introduced 780 case distinctions, treesize of input 415320 treesize of output 336604 [2021-11-23 03:34:22,550 WARN L227 SmtUtils]: Spent 8.71s on a formula simplification. DAG size of input: 2349 DAG size of output: 2329 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-23 03:36:01,823 WARN L227 SmtUtils]: Spent 1.55m on a formula simplification. DAG size of input: 2872 DAG size of output: 1060 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-23 03:36:01,827 INFO L354 Elim1Store]: treesize reduction 6635, result has 28.3 percent of original size [2021-11-23 03:36:01,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 43 select indices, 43 select index equivalence classes, 0 disjoint index pairs (out of 903 index pairs), introduced 53 new quantified variables, introduced 903 case distinctions, treesize of input 12510877 treesize of output 10308220