./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2n_remove_all.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_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/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_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/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_f6fbc5eb-25a8-42e3-8233-8143774691b8/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 bae9bfc842bb010963d083e19e9498cfd3af182f91f0b8fa56907786a4d462dd --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:31:13,739 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:31:13,743 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:31:13,791 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:31:13,792 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:31:13,796 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:31:13,798 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:31:13,802 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:31:13,805 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:31:13,813 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:31:13,814 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:31:13,816 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:31:13,817 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:31:13,821 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:31:13,824 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:31:13,830 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:31:13,832 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:31:13,833 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:31:13,840 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:31:13,848 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:31:13,852 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:31:13,853 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:31:13,857 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:31:13,858 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:31:13,864 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:31:13,864 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:31:13,864 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:31:13,865 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:31:13,866 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:31:13,867 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:31:13,867 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:31:13,868 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:31:13,869 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:31:13,870 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:31:13,871 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:31:13,871 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:31:13,872 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:31:13,872 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:31:13,873 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:31:13,873 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:31:13,874 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:31:13,875 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:31:13,904 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:31:13,904 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:31:13,904 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:31:13,905 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:31:13,905 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:31:13,905 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:31:13,906 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:31:13,906 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:31:13,906 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:31:13,906 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:31:13,907 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:31:13,907 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:31:13,907 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:31:13,907 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:31:13,907 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:31:13,908 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:31:13,908 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:31:13,908 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:31:13,909 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:31:13,909 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:31:13,909 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:31:13,909 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:31:13,910 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:31:13,910 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:31:13,910 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:31:13,910 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:31:13,910 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:31:13,911 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:31:13,911 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:31:13,911 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:31:13,912 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:31:13,912 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:31:13,912 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:31:13,912 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:31:13,913 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:31:13,913 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:31:13,913 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:31:13,913 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:31:13,913 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:31:13,914 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:31:13,914 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:31:13,914 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_f6fbc5eb-25a8-42e3-8233-8143774691b8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bae9bfc842bb010963d083e19e9498cfd3af182f91f0b8fa56907786a4d462dd [2021-11-23 02:31:14,228 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:31:14,256 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:31:14,259 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:31:14,260 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:31:14,261 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:31:14,262 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/list-simple/sll2n_remove_all.i [2021-11-23 02:31:14,343 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/data/6f2dda2cb/bafecfd2e84f48cdb4468879d05e563e/FLAG531705087 [2021-11-23 02:31:14,955 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:31:14,956 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/sv-benchmarks/c/list-simple/sll2n_remove_all.i [2021-11-23 02:31:14,969 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/data/6f2dda2cb/bafecfd2e84f48cdb4468879d05e563e/FLAG531705087 [2021-11-23 02:31:15,254 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/data/6f2dda2cb/bafecfd2e84f48cdb4468879d05e563e [2021-11-23 02:31:15,257 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:31:15,258 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:31:15,260 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:31:15,260 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:31:15,264 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:31:15,265 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,266 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47ecc45c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15, skipping insertion in model container [2021-11-23 02:31:15,267 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,274 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:31:15,308 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:31:15,634 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_f6fbc5eb-25a8-42e3-8233-8143774691b8/sv-benchmarks/c/list-simple/sll2n_remove_all.i[23806,23819] [2021-11-23 02:31:15,637 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:31:15,649 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:31:15,719 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_f6fbc5eb-25a8-42e3-8233-8143774691b8/sv-benchmarks/c/list-simple/sll2n_remove_all.i[23806,23819] [2021-11-23 02:31:15,728 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:31:15,763 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:31:15,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15 WrapperNode [2021-11-23 02:31:15,764 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:31:15,765 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:31:15,766 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:31:15,766 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:31:15,774 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,787 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,809 INFO L137 Inliner]: procedures = 126, calls = 25, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 83 [2021-11-23 02:31:15,810 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:31:15,811 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:31:15,811 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:31:15,811 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:31:15,820 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,820 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,824 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,824 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,831 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,834 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,836 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,839 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:31:15,840 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:31:15,841 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:31:15,841 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:31:15,847 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (1/1) ... [2021-11-23 02:31:15,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:31:15,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:15,900 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:31:15,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:31:15,951 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:31:15,951 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:31:15,952 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:31:15,952 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:31:15,952 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:31:15,952 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:31:15,952 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:31:15,952 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 02:31:15,953 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:31:15,953 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:31:15,953 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:31:16,084 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:31:16,086 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:31:16,263 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:31:16,343 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:31:16,344 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:31:16,346 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:31:16 BoogieIcfgContainer [2021-11-23 02:31:16,347 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:31:16,348 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:31:16,349 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:31:16,352 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:31:16,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:31:15" (1/3) ... [2021-11-23 02:31:16,353 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@aaf0cc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:31:16, skipping insertion in model container [2021-11-23 02:31:16,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:31:15" (2/3) ... [2021-11-23 02:31:16,354 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@aaf0cc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:31:16, skipping insertion in model container [2021-11-23 02:31:16,354 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:31:16" (3/3) ... [2021-11-23 02:31:16,355 INFO L111 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all.i [2021-11-23 02:31:16,361 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:31:16,361 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:31:16,410 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:31:16,417 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 02:31:16,417 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:31:16,431 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:16,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-23 02:31:16,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:16,437 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-23 02:31:16,438 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:16,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:16,444 INFO L85 PathProgramCache]: Analyzing trace with hash 87054654, now seen corresponding path program 1 times [2021-11-23 02:31:16,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:16,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226577765] [2021-11-23 02:31:16,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:16,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:16,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:16,681 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 02:31:16,682 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:16,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226577765] [2021-11-23 02:31:16,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226577765] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:31:16,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:31:16,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:31:16,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652078910] [2021-11-23 02:31:16,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:31:16,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:31:16,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:16,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:31:16,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:31:16,721 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:16,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:16,782 INFO L93 Difference]: Finished difference Result 19 states and 25 transitions. [2021-11-23 02:31:16,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:31:16,785 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-23 02:31:16,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:16,794 INFO L225 Difference]: With dead ends: 19 [2021-11-23 02:31:16,794 INFO L226 Difference]: Without dead ends: 9 [2021-11-23 02:31:16,797 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:31:16,801 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:16,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:31:16,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-23 02:31:16,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 8. [2021-11-23 02:31:16,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:16,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-23 02:31:16,835 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2021-11-23 02:31:16,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:16,835 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-23 02:31:16,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:16,836 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-23 02:31:16,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:31:16,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:16,836 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:16,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:31:16,838 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:16,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:16,842 INFO L85 PathProgramCache]: Analyzing trace with hash 392524083, now seen corresponding path program 1 times [2021-11-23 02:31:16,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:16,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967932545] [2021-11-23 02:31:16,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:16,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:16,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:16,956 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:16,956 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:16,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967932545] [2021-11-23 02:31:16,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967932545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:16,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801991384] [2021-11-23 02:31:16,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:16,958 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:16,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:16,960 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:16,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:31:17,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:17,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:31:17,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:17,102 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:17,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:17,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:17,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801991384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:17,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2000842597] [2021-11-23 02:31:17,158 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:17,158 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:17,163 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:17,168 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:17,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:17,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,331 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:31:17,333 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 02:31:17,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-23 02:31:17,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,472 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-23 02:31:17,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-23 02:31:17,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-23 02:31:17,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,654 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:17,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 28 [2021-11-23 02:31:17,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 23 [2021-11-23 02:31:17,708 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:17,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 13 [2021-11-23 02:31:17,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:17,737 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:17,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 17 [2021-11-23 02:31:17,986 INFO L354 Elim1Store]: treesize reduction 124, result has 24.8 percent of original size [2021-11-23 02:31:17,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 286 treesize of output 310 [2021-11-23 02:31:18,101 INFO L354 Elim1Store]: treesize reduction 92, result has 21.4 percent of original size [2021-11-23 02:31:18,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 303 treesize of output 312 [2021-11-23 02:31:18,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:18,597 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:31:18,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 383 treesize of output 365 [2021-11-23 02:31:18,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:18,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:18,692 INFO L354 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2021-11-23 02:31:18,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 364 treesize of output 341 [2021-11-23 02:31:18,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:18,805 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 02:31:18,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 343 treesize of output 352 [2021-11-23 02:31:18,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:18,886 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 02:31:18,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 352 treesize of output 361 [2021-11-23 02:31:18,906 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:18,954 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 02:31:18,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 2 case distinctions, treesize of input 361 treesize of output 354 [2021-11-23 02:31:18,979 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:19,009 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 02:31:19,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 2 case distinctions, treesize of input 351 treesize of output 344 [2021-11-23 02:31:19,271 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 02:31:19,279 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 02:31:19,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:19,331 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:19,333 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 45 treesize of output 7 [2021-11-23 02:31:19,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:19,356 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:19,357 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 39 treesize of output 17 [2021-11-23 02:31:19,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:19,376 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:19,378 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 46 treesize of output 23 [2021-11-23 02:31:19,438 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 02:31:19,446 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 02:31:19,452 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:19,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2000842597] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:31:19,752 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:19,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 7 [2021-11-23 02:31:19,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443897798] [2021-11-23 02:31:19,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:31:19,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:31:19,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:19,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:31:19,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:31:19,755 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:19,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:19,794 INFO L93 Difference]: Finished difference Result 12 states and 13 transitions. [2021-11-23 02:31:19,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:31:19,794 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:31:19,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:19,795 INFO L225 Difference]: With dead ends: 12 [2021-11-23 02:31:19,795 INFO L226 Difference]: Without dead ends: 9 [2021-11-23 02:31:19,796 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:31:19,797 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 6 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:19,797 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 6 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:31:19,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-23 02:31:19,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-23 02:31:19,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:19,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-11-23 02:31:19,802 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2021-11-23 02:31:19,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:19,802 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-11-23 02:31:19,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:19,803 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-11-23 02:31:19,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:31:19,803 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:19,803 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:19,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:31:20,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:20,004 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:20,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:20,005 INFO L85 PathProgramCache]: Analyzing trace with hash -716756293, now seen corresponding path program 1 times [2021-11-23 02:31:20,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:20,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624069909] [2021-11-23 02:31:20,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:20,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:20,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:20,059 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:31:20,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:20,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624069909] [2021-11-23 02:31:20,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1624069909] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:20,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281419621] [2021-11-23 02:31:20,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:20,060 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:20,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:20,061 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:20,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:31:20,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:20,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:31:20,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:20,153 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:31:20,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:20,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:31:20,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1281419621] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:20,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1281999008] [2021-11-23 02:31:20,177 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:20,177 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:20,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:20,178 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:20,178 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:20,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,211 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:31:20,212 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 02:31:20,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,237 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:31:20,237 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 02:31:20,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,301 INFO L354 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-11-23 02:31:20,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 38 [2021-11-23 02:31:20,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,350 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-23 02:31:20,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-23 02:31:20,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,416 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:20,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 17 [2021-11-23 02:31:20,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,437 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:20,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 17 [2021-11-23 02:31:20,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:20,460 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:20,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 28 [2021-11-23 02:31:20,619 INFO L354 Elim1Store]: treesize reduction 92, result has 21.4 percent of original size [2021-11-23 02:31:20,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 286 treesize of output 295 [2021-11-23 02:31:20,725 INFO L354 Elim1Store]: treesize reduction 132, result has 20.0 percent of original size [2021-11-23 02:31:20,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 292 treesize of output 308 [2021-11-23 02:31:21,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,163 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 02:31:21,163 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 1 case distinctions, treesize of input 383 treesize of output 392 [2021-11-23 02:31:21,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,306 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 02:31:21,307 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 1 case distinctions, treesize of input 392 treesize of output 401 [2021-11-23 02:31:21,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,336 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:31:21,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 401 treesize of output 383 [2021-11-23 02:31:21,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,397 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-23 02:31:21,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 382 treesize of output 359 [2021-11-23 02:31:21,417 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:21,440 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 02:31:21,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 361 treesize of output 354 [2021-11-23 02:31:21,472 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:21,500 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 02:31:21,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 351 treesize of output 344 [2021-11-23 02:31:21,698 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 02:31:21,708 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 02:31:21,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:21,748 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 45 treesize of output 7 [2021-11-23 02:31:21,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,768 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:21,769 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 39 treesize of output 17 [2021-11-23 02:31:21,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:21,786 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:21,791 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 46 treesize of output 23 [2021-11-23 02:31:21,863 INFO L354 Elim1Store]: treesize reduction 61, result has 17.6 percent of original size [2021-11-23 02:31:21,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 67 [2021-11-23 02:31:21,885 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 02:31:21,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 58 treesize of output 48 [2021-11-23 02:31:21,894 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 02:31:21,921 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 02:31:22,002 INFO L354 Elim1Store]: treesize reduction 42, result has 43.2 percent of original size [2021-11-23 02:31:22,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 67 treesize of output 75 [2021-11-23 02:31:22,036 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-23 02:31:22,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 69 treesize of output 71 [2021-11-23 02:31:22,047 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 73 treesize of output 72 [2021-11-23 02:31:22,161 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 02:31:22,232 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 02:31:22,241 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 02:31:22,245 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:22,799 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '185#(and (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_main_~i~0#1| 0) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:22,800 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:22,800 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:22,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2021-11-23 02:31:22,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172406931] [2021-11-23 02:31:22,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:22,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:31:22,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:22,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:31:22,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:31:22,802 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:22,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:22,838 INFO L93 Difference]: Finished difference Result 16 states and 18 transitions. [2021-11-23 02:31:22,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:31:22,840 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-23 02:31:22,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:22,841 INFO L225 Difference]: With dead ends: 16 [2021-11-23 02:31:22,841 INFO L226 Difference]: Without dead ends: 11 [2021-11-23 02:31:22,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:31:22,842 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 2 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:22,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 6 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:31:22,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-23 02:31:22,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-23 02:31:22,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:22,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-23 02:31:22,849 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2021-11-23 02:31:22,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:22,849 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-23 02:31:22,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:22,850 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-23 02:31:22,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 02:31:22,852 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:22,852 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:22,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:31:23,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:23,053 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:23,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:23,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1512697178, now seen corresponding path program 2 times [2021-11-23 02:31:23,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:23,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937505031] [2021-11-23 02:31:23,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:23,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:23,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:23,169 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 02:31:23,169 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:23,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937505031] [2021-11-23 02:31:23,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937505031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:23,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585449615] [2021-11-23 02:31:23,170 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:31:23,170 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:23,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:23,171 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:23,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:31:23,229 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:31:23,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:31:23,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:31:23,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:23,255 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 02:31:23,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:23,276 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 02:31:23,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1585449615] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:23,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [578215692] [2021-11-23 02:31:23,278 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:23,279 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:23,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:23,279 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:23,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:23,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,309 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:31:23,310 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 02:31:23,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-23 02:31:23,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,369 INFO L354 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-11-23 02:31:23,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 38 [2021-11-23 02:31:23,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,411 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-23 02:31:23,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-23 02:31:23,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,475 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:23,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 28 [2021-11-23 02:31:23,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 23 [2021-11-23 02:31:23,504 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:23,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 13 [2021-11-23 02:31:23,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:23,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 23 [2021-11-23 02:31:23,527 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:23,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 13 [2021-11-23 02:31:23,725 INFO L354 Elim1Store]: treesize reduction 124, result has 24.8 percent of original size [2021-11-23 02:31:23,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 286 treesize of output 310 [2021-11-23 02:31:23,806 INFO L354 Elim1Store]: treesize reduction 92, result has 21.4 percent of original size [2021-11-23 02:31:23,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 303 treesize of output 312 [2021-11-23 02:31:24,290 INFO L354 Elim1Store]: treesize reduction 49, result has 25.8 percent of original size [2021-11-23 02:31:24,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 493 treesize of output 477 [2021-11-23 02:31:24,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:24,413 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 02:31:24,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 477 treesize of output 486 [2021-11-23 02:31:24,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:24,502 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 02:31:24,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 486 treesize of output 495 [2021-11-23 02:31:24,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:24,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:24,570 INFO L354 Elim1Store]: treesize reduction 74, result has 24.5 percent of original size [2021-11-23 02:31:24,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 495 treesize of output 493 [2021-11-23 02:31:24,592 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:24,622 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 02:31:24,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 2 case distinctions, treesize of input 493 treesize of output 486 [2021-11-23 02:31:24,637 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:24,670 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 02:31:24,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 2 case distinctions, treesize of input 486 treesize of output 479 [2021-11-23 02:31:25,173 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 02:31:25,183 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 02:31:25,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:25,215 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:25,216 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 45 treesize of output 7 [2021-11-23 02:31:25,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:25,238 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:25,239 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 46 treesize of output 23 [2021-11-23 02:31:25,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:31:25,255 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:25,256 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 39 treesize of output 17 [2021-11-23 02:31:25,297 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 02:31:25,318 INFO L354 Elim1Store]: treesize reduction 61, result has 17.6 percent of original size [2021-11-23 02:31:25,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 67 [2021-11-23 02:31:25,340 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 02:31:25,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 58 treesize of output 48 [2021-11-23 02:31:25,349 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 02:31:25,409 INFO L354 Elim1Store]: treesize reduction 42, result has 43.2 percent of original size [2021-11-23 02:31:25,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 67 treesize of output 75 [2021-11-23 02:31:25,444 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-23 02:31:25,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 69 treesize of output 71 [2021-11-23 02:31:25,454 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 65 treesize of output 64 [2021-11-23 02:31:25,546 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 02:31:25,593 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 02:31:25,601 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 02:31:25,606 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:25,964 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '296#(and (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_main_~i~0#1| 0) (<= |ULTIMATE.start_main_~data~0#1| 1) (<= 0 |#NULL.base|) (<= 2 |ULTIMATE.start_main_~len~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~len~0#1| 2) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |#NULL.base| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#NULL.offset|) (<= 1 |ULTIMATE.start_main_~data~0#1|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|))' at error location [2021-11-23 02:31:25,964 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:25,964 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:25,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2021-11-23 02:31:25,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30972936] [2021-11-23 02:31:25,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:25,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:31:25,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:25,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:31:25,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:31:25,967 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:26,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:26,004 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-11-23 02:31:26,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:31:26,004 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-23 02:31:26,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:26,005 INFO L225 Difference]: With dead ends: 15 [2021-11-23 02:31:26,005 INFO L226 Difference]: Without dead ends: 12 [2021-11-23 02:31:26,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:31:26,007 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:26,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 6 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:31:26,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-23 02:31:26,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-23 02:31:26,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:26,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-23 02:31:26,013 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2021-11-23 02:31:26,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:26,013 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-23 02:31:26,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:26,014 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-23 02:31:26,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 02:31:26,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:26,015 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 02:31:26,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:31:26,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:26,230 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:26,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:26,231 INFO L85 PathProgramCache]: Analyzing trace with hash 350926760, now seen corresponding path program 3 times [2021-11-23 02:31:26,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:26,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523004767] [2021-11-23 02:31:26,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:26,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:26,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:26,643 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:26,643 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:26,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523004767] [2021-11-23 02:31:26,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523004767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:26,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259361737] [2021-11-23 02:31:26,644 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:31:26,644 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:26,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:26,645 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:26,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6fbc5eb-25a8-42e3-8233-8143774691b8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:31:26,806 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:31:26,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:31:26,808 WARN L261 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-23 02:31:26,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:26,869 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 02:31:26,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:31:26,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:31:26,981 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-23 02:31:26,981 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 02:31:27,053 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:27,063 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 02:31:27,063 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 1 case distinctions, treesize of input 74 treesize of output 81 [2021-11-23 02:31:27,073 INFO L354 Elim1Store]: treesize reduction 35, result has 27.1 percent of original size [2021-11-23 02:31:27,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 92 treesize of output 84 [2021-11-23 02:31:27,077 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:31:27,084 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-23 02:31:27,084 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 81 treesize of output 83 [2021-11-23 02:31:27,240 INFO L354 Elim1Store]: treesize reduction 111, result has 2.6 percent of original size [2021-11-23 02:31:27,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 128 treesize of output 85 [2021-11-23 02:31:27,257 INFO L354 Elim1Store]: treesize reduction 77, result has 3.8 percent of original size [2021-11-23 02:31:27,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 86 treesize of output 82 [2021-11-23 02:31:27,363 INFO L354 Elim1Store]: treesize reduction 105, result has 11.0 percent of original size [2021-11-23 02:31:27,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 119 treesize of output 102 [2021-11-23 02:31:27,385 INFO L354 Elim1Store]: treesize reduction 89, result has 11.0 percent of original size [2021-11-23 02:31:27,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 104 treesize of output 96 [2021-11-23 02:31:27,468 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:31:27,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 91 treesize of output 54 [2021-11-23 02:31:27,477 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:31:27,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 25 [2021-11-23 02:31:27,492 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:27,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:52,069 WARN L227 SmtUtils]: Spent 1.39m on a formula simplification. DAG size of input: 1499 DAG size of output: 501 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-23 02:32:52,072 INFO L354 Elim1Store]: treesize reduction 40047, result has 17.5 percent of original size [2021-11-23 02:32:52,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 30 select indices, 30 select index equivalence classes, 0 disjoint index pairs (out of 435 index pairs), introduced 38 new quantified variables, introduced 435 case distinctions, treesize of input 14030748284 treesize of output 13456810195