./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/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_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/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_eab29b72-9cd1-41be-845c-62c12b8e3f3c/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 b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:22:46,839 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:22:46,843 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:22:46,905 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:22:46,906 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:22:46,907 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:22:46,910 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:22:46,914 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:22:46,918 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:22:46,920 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:22:46,922 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:22:46,924 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:22:46,925 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:22:46,927 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:22:46,929 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:22:46,931 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:22:46,933 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:22:46,935 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:22:46,938 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:22:46,942 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:22:46,945 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:22:46,947 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:22:46,950 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:22:46,951 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:22:46,957 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:22:46,958 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:22:46,958 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:22:46,960 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:22:46,961 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:22:46,966 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:22:46,966 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:22:46,968 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:22:46,969 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:22:46,971 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:22:46,972 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:22:46,973 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:22:46,974 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:22:46,975 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:22:46,976 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:22:46,977 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:22:46,979 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:22:46,980 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:22:47,011 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:22:47,012 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:22:47,012 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:22:47,013 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:22:47,014 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:22:47,015 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:22:47,015 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:22:47,016 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:22:47,016 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:22:47,017 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:22:47,017 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:22:47,018 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:22:47,018 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:22:47,019 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:22:47,019 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:22:47,020 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:22:47,020 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:22:47,021 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:22:47,022 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:22:47,023 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:22:47,023 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:22:47,024 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:22:47,024 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:22:47,024 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:22:47,025 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:22:47,025 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:22:47,025 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:22:47,026 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:22:47,026 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:22:47,026 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:22:47,027 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:22:47,027 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:22:47,027 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:22:47,028 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:22:47,028 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:22:47,028 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:22:47,029 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:22:47,029 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:22:47,029 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:22:47,030 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:22:47,030 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:22:47,030 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_eab29b72-9cd1-41be-845c-62c12b8e3f3c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 [2021-11-23 03:22:47,383 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:22:47,430 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:22:47,434 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:22:47,435 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:22:47,437 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:22:47,438 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2021-11-23 03:22:47,543 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/data/c50525e74/0d5ba265d55c4f0ca3ecba2011a4320b/FLAG604114c36 [2021-11-23 03:22:48,174 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:22:48,175 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2021-11-23 03:22:48,191 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/data/c50525e74/0d5ba265d55c4f0ca3ecba2011a4320b/FLAG604114c36 [2021-11-23 03:22:48,449 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/data/c50525e74/0d5ba265d55c4f0ca3ecba2011a4320b [2021-11-23 03:22:48,452 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:22:48,455 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:22:48,461 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:22:48,461 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:22:48,466 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:22:48,467 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:22:48" (1/1) ... [2021-11-23 03:22:48,471 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c3ba4da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:48, skipping insertion in model container [2021-11-23 03:22:48,471 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:22:48" (1/1) ... [2021-11-23 03:22:48,482 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:22:48,548 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:22:48,926 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_eab29b72-9cd1-41be-845c-62c12b8e3f3c/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2021-11-23 03:22:48,939 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:22:48,950 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:22:49,000 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_eab29b72-9cd1-41be-845c-62c12b8e3f3c/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2021-11-23 03:22:49,001 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:22:49,043 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:22:49,044 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49 WrapperNode [2021-11-23 03:22:49,044 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:22:49,046 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:22:49,046 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:22:49,046 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:22:49,056 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,073 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,103 INFO L137 Inliner]: procedures = 126, calls = 30, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 102 [2021-11-23 03:22:49,103 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:22:49,104 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:22:49,105 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:22:49,105 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:22:49,115 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,115 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,120 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,120 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,129 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,134 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,137 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,141 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:22:49,142 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:22:49,142 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:22:49,142 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:22:49,144 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (1/1) ... [2021-11-23 03:22:49,153 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:22:49,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:49,181 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:22:49,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:22:49,238 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 03:22:49,238 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 03:22:49,239 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:22:49,239 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 03:22:49,239 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 03:22:49,239 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 03:22:49,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 03:22:49,240 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 03:22:49,240 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:22:49,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:22:49,240 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:22:49,390 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:22:49,407 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:22:49,670 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:22:49,709 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:22:49,714 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 03:22:49,717 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:22:49 BoogieIcfgContainer [2021-11-23 03:22:49,717 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:22:49,740 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:22:49,740 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:22:49,744 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:22:49,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:22:48" (1/3) ... [2021-11-23 03:22:49,746 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d448b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:22:49, skipping insertion in model container [2021-11-23 03:22:49,747 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:49" (2/3) ... [2021-11-23 03:22:49,747 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d448b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:22:49, skipping insertion in model container [2021-11-23 03:22:49,747 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:22:49" (3/3) ... [2021-11-23 03:22:49,750 INFO L111 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2021-11-23 03:22:49,761 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:22:49,761 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:22:49,852 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:22:49,868 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:22:49,868 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:22:49,900 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 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 03:22:49,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-23 03:22:49,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:49,910 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-23 03:22:49,911 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:49,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:49,919 INFO L85 PathProgramCache]: Analyzing trace with hash 105098037, now seen corresponding path program 1 times [2021-11-23 03:22:49,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:49,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620058068] [2021-11-23 03:22:49,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:49,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:50,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:50,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:22:50,176 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:50,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620058068] [2021-11-23 03:22:50,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620058068] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:50,178 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:22:50,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:22:50,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733921642] [2021-11-23 03:22:50,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:50,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:50,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:50,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:50,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:22:50,230 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 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 03:22:50,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:50,282 INFO L93 Difference]: Finished difference Result 29 states and 41 transitions. [2021-11-23 03:22:50,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:50,285 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 03:22:50,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:50,295 INFO L225 Difference]: With dead ends: 29 [2021-11-23 03:22:50,296 INFO L226 Difference]: Without dead ends: 14 [2021-11-23 03:22:50,299 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 03:22:50,304 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 3 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 24 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 03:22:50,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 24 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:22:50,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-23 03:22:50,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2021-11-23 03:22:50,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 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 03:22:50,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2021-11-23 03:22:50,347 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 5 [2021-11-23 03:22:50,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:50,348 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2021-11-23 03:22:50,349 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 03:22:50,349 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2021-11-23 03:22:50,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 03:22:50,350 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:50,350 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:50,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:22:50,351 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:50,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:50,352 INFO L85 PathProgramCache]: Analyzing trace with hash 92344700, now seen corresponding path program 1 times [2021-11-23 03:22:50,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:50,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529131277] [2021-11-23 03:22:50,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:50,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:50,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:50,445 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 03:22:50,445 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:50,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1529131277] [2021-11-23 03:22:50,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1529131277] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:50,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861641062] [2021-11-23 03:22:50,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:50,448 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:50,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:50,450 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:50,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:22:50,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:50,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:22:50,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:50,670 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 03:22:50,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:22:50,720 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 03:22:50,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861641062] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:22:50,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1708997111] [2021-11-23 03:22:50,745 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 03:22:50,745 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:22:50,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:22:50,759 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:22:50,759 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:22:50,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,017 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:22:51,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:22:51,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,054 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 03:22:51,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,208 INFO L354 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-11-23 03:22:51,209 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 03:22:51,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,321 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-23 03:22:51,321 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 03:22:51,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,496 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:51,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 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 03:22:51,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 03:22:51,574 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:51,578 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 03:22:51,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:51,623 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 03:22:51,643 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:51,644 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 03:22:52,034 INFO L354 Elim1Store]: treesize reduction 124, result has 24.8 percent of original size [2021-11-23 03:22:52,037 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 03:22:52,195 INFO L354 Elim1Store]: treesize reduction 92, result has 21.4 percent of original size [2021-11-23 03:22:52,196 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 03:22:52,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:52,909 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 03:22:52,910 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 383 treesize of output 392 [2021-11-23 03:22:52,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:52,953 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:22:52,954 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 392 treesize of output 374 [2021-11-23 03:22:52,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:52,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:53,041 INFO L354 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2021-11-23 03:22:53,042 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 373 treesize of output 350 [2021-11-23 03:22:53,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:53,147 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 03:22:53,148 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 03:22:53,175 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:53,224 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 03:22:53,228 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 03:22:53,275 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:53,322 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 03:22:53,323 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 03:22:53,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:22:53,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:22:53,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:53,745 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:53,748 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 46 treesize of output 23 [2021-11-23 03:22:53,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:53,775 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:53,776 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 03:22:53,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:53,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:53,804 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 03:22:53,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:22:53,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:22:53,903 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:22:54,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1708997111] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:54,296 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:22:54,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 7 [2021-11-23 03:22:54,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667763082] [2021-11-23 03:22:54,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:54,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:22:54,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:54,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:22:54,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:22:54,300 INFO L87 Difference]: Start difference. First operand 13 states and 16 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 03:22:54,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:54,424 INFO L93 Difference]: Finished difference Result 21 states and 26 transitions. [2021-11-23 03:22:54,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:22:54,425 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 03:22:54,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:54,428 INFO L225 Difference]: With dead ends: 21 [2021-11-23 03:22:54,429 INFO L226 Difference]: Without dead ends: 18 [2021-11-23 03:22:54,432 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:22:54,440 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:54,441 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 9 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:54,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-23 03:22:54,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 14. [2021-11-23 03:22:54,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 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 03:22:54,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-11-23 03:22:54,456 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2021-11-23 03:22:54,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:54,457 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-11-23 03:22:54,458 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 03:22:54,458 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-11-23 03:22:54,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 03:22:54,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:54,461 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:54,502 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 03:22:54,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-23 03:22:54,690 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:54,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:54,691 INFO L85 PathProgramCache]: Analyzing trace with hash 805788942, now seen corresponding path program 1 times [2021-11-23 03:22:54,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:54,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887716584] [2021-11-23 03:22:54,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:54,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:54,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:54,768 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 03:22:54,769 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:54,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887716584] [2021-11-23 03:22:54,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887716584] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:54,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197367423] [2021-11-23 03:22:54,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:54,770 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:54,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:54,776 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:54,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:22:54,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:54,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:22:54,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:54,958 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 03:22:54,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:22:55,004 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 03:22:55,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197367423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:22:55,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [409560455] [2021-11-23 03:22:55,009 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 03:22:55,009 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:22:55,010 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:22:55,010 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:22:55,010 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:22:55,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,119 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:22:55,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:22:55,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,154 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 03:22:55,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,256 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-23 03:22:55,257 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 03:22:55,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,282 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 03:22:55,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,358 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:55,360 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 03:22:55,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,383 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 03:22:55,394 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:55,396 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 03:22:55,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:55,417 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 34 treesize of output 23 [2021-11-23 03:22:55,427 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:55,438 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 03:22:55,690 INFO L354 Elim1Store]: treesize reduction 124, result has 24.8 percent of original size [2021-11-23 03:22:55,691 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 03:22:55,783 INFO L354 Elim1Store]: treesize reduction 92, result has 21.4 percent of original size [2021-11-23 03:22:55,784 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 03:22:56,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:56,292 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 03:22:56,293 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 383 treesize of output 392 [2021-11-23 03:22:56,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:56,470 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 03:22:56,471 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 392 treesize of output 401 [2021-11-23 03:22:56,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:56,512 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:22:56,513 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 401 treesize of output 383 [2021-11-23 03:22:56,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:56,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:56,579 INFO L354 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2021-11-23 03:22:56,579 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 382 treesize of output 359 [2021-11-23 03:22:56,613 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:56,634 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 03:22:56,635 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 03:22:56,658 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:56,689 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 03:22:56,689 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 363 treesize of output 356 [2021-11-23 03:22:56,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:22:56,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:22:57,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:57,019 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:57,020 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 03:22:57,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:57,063 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:57,065 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 03:22:57,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:57,092 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:57,098 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 03:22:57,200 INFO L354 Elim1Store]: treesize reduction 61, result has 17.6 percent of original size [2021-11-23 03:22:57,201 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 03:22:57,226 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:22:57,227 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 03:22:57,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 38 [2021-11-23 03:22:57,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:22:57,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:22:57,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:22:57,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 14 [2021-11-23 03:22:57,408 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 14 treesize of output 13 [2021-11-23 03:22:57,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 14 [2021-11-23 03:22:57,593 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 14 treesize of output 13 [2021-11-23 03:22:57,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:22:57,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:22:57,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:22:57,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:22:57,799 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:22:58,847 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '237#(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 03:22:58,847 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:22:58,847 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:22:58,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2021-11-23 03:22:58,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326252644] [2021-11-23 03:22:58,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:22:58,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:22:58,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:58,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:22:58,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:22:58,850 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 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 03:22:58,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:58,883 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2021-11-23 03:22:58,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:22:58,883 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 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) Word has length 10 [2021-11-23 03:22:58,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:58,884 INFO L225 Difference]: With dead ends: 26 [2021-11-23 03:22:58,884 INFO L226 Difference]: Without dead ends: 16 [2021-11-23 03:22:58,884 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:22:58,886 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 2 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:58,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 27 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:22:58,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-23 03:22:58,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-23 03:22:58,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 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 03:22:58,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-23 03:22:58,892 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 10 [2021-11-23 03:22:58,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:58,892 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-23 03:22:58,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 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 03:22:58,892 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-23 03:22:58,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 03:22:58,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:58,893 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:58,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:59,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:59,094 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:59,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:59,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1235104985, now seen corresponding path program 2 times [2021-11-23 03:22:59,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:59,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673654123] [2021-11-23 03:22:59,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:59,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:59,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:59,243 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:22:59,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:59,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673654123] [2021-11-23 03:22:59,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673654123] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:59,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080959573] [2021-11-23 03:22:59,244 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:22:59,245 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:59,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:59,246 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:59,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:22:59,331 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:22:59,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:22:59,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:22:59,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:59,370 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:22:59,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:22:59,407 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:22:59,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080959573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:22:59,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822683575] [2021-11-23 03:22:59,418 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 03:22:59,418 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:22:59,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:22:59,419 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:22:59,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:22:59,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,473 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:22:59,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:22:59,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,489 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 03:22:59,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,552 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-23 03:22:59,552 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 03:22:59,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,575 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 03:22:59,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,628 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 03:22:59,638 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:59,639 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 03:22:59,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,662 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:59,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 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 03:22:59,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:22:59,684 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 03:22:59,697 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:22:59,700 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 03:22:59,933 INFO L354 Elim1Store]: treesize reduction 124, result has 24.8 percent of original size [2021-11-23 03:22:59,934 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 03:23:00,024 INFO L354 Elim1Store]: treesize reduction 92, result has 21.4 percent of original size [2021-11-23 03:23:00,025 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 03:23:00,376 INFO L354 Elim1Store]: treesize reduction 49, result has 25.8 percent of original size [2021-11-23 03:23:00,377 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 383 treesize of output 375 [2021-11-23 03:23:00,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:00,499 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 03:23:00,500 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 377 treesize of output 386 [2021-11-23 03:23:00,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:00,591 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 03:23:00,592 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 386 treesize of output 395 [2021-11-23 03:23:00,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:00,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:00,690 INFO L354 Elim1Store]: treesize reduction 74, result has 24.5 percent of original size [2021-11-23 03:23:00,691 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 395 treesize of output 385 [2021-11-23 03:23:00,720 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:00,759 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 03:23:00,759 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 387 treesize of output 380 [2021-11-23 03:23:00,783 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:00,818 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 03:23:00,818 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 377 treesize of output 370 [2021-11-23 03:23:01,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:23:01,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:23:01,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:01,520 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:01,521 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 03:23:01,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:01,547 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:01,548 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 03:23:01,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:01,571 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:01,572 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 03:23:01,683 INFO L354 Elim1Store]: treesize reduction 61, result has 17.6 percent of original size [2021-11-23 03:23:01,684 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 03:23:01,717 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:23:01,718 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 03:23:01,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 38 [2021-11-23 03:23:01,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:23:01,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:23:01,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 14 [2021-11-23 03:23:01,883 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 14 treesize of output 13 [2021-11-23 03:23:01,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:23:02,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-23 03:23:02,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 14 [2021-11-23 03:23:02,082 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 14 treesize of output 13 [2021-11-23 03:23:02,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:23:02,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:23:02,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:23:02,242 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:23:03,300 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '380#(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 03:23:03,301 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:23:03,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:23:03,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2021-11-23 03:23:03,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858918296] [2021-11-23 03:23:03,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:23:03,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:23:03,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:03,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:23:03,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:23:03,303 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 03:23:03,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:03,370 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2021-11-23 03:23:03,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:23:03,371 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 12 [2021-11-23 03:23:03,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:03,372 INFO L225 Difference]: With dead ends: 25 [2021-11-23 03:23:03,372 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 03:23:03,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:23:03,373 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 38 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:03,373 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 18 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:23:03,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 03:23:03,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 03:23:03,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 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 03:23:03,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-23 03:23:03,380 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 12 [2021-11-23 03:23:03,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:03,380 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-23 03:23:03,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 03:23:03,381 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-23 03:23:03,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 03:23:03,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:03,382 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 03:23:03,411 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-23 03:23:03,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:03,595 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:03,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:03,596 INFO L85 PathProgramCache]: Analyzing trace with hash -1483882621, now seen corresponding path program 3 times [2021-11-23 03:23:03,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:03,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446540020] [2021-11-23 03:23:03,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:03,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:03,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:03,747 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:23:03,747 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:03,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446540020] [2021-11-23 03:23:03,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446540020] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:03,747 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:03,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:23:03,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88911115] [2021-11-23 03:23:03,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:03,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:23:03,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:03,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:23:03,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:23:03,749 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 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 03:23:03,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:03,840 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-11-23 03:23:03,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:23:03,841 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 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) Word has length 15 [2021-11-23 03:23:03,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:03,842 INFO L225 Difference]: With dead ends: 33 [2021-11-23 03:23:03,842 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 03:23:03,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:23:03,844 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 17 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:03,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 22 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:23:03,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 03:23:03,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 03:23:03,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 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 03:23:03,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-23 03:23:03,853 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15 [2021-11-23 03:23:03,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:03,853 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-23 03:23:03,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 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 03:23:03,854 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-23 03:23:03,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 03:23:03,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:03,855 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 03:23:03,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:23:03,856 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:03,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:03,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1126605433, now seen corresponding path program 1 times [2021-11-23 03:23:03,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:03,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683562952] [2021-11-23 03:23:03,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:03,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:03,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:04,117 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:23:04,118 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:04,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683562952] [2021-11-23 03:23:04,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683562952] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:23:04,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768733049] [2021-11-23 03:23:04,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:04,119 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:04,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:04,122 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:23:04,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:23:04,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:04,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 03:23:04,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:04,351 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 03:23:04,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 57 [2021-11-23 03:23:04,361 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 03:23:04,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 44 [2021-11-23 03:23:04,404 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:23:04,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:23:04,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768733049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:04,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:23:04,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2021-11-23 03:23:04,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955157583] [2021-11-23 03:23:04,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:04,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:23:04,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:04,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:23:04,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:23:04,407 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 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 03:23:04,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:04,448 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2021-11-23 03:23:04,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:23:04,454 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 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 21 [2021-11-23 03:23:04,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:04,458 INFO L225 Difference]: With dead ends: 38 [2021-11-23 03:23:04,458 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 03:23:04,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:23:04,462 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:04,462 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 9 Unchecked, 0.0s Time] [2021-11-23 03:23:04,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 03:23:04,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 03:23:04,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 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 03:23:04,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-11-23 03:23:04,475 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 21 [2021-11-23 03:23:04,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:04,476 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-11-23 03:23:04,476 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 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 03:23:04,476 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-11-23 03:23:04,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 03:23:04,478 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:04,479 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 03:23:04,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:23:04,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:04,694 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:04,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:04,694 INFO L85 PathProgramCache]: Analyzing trace with hash -452641475, now seen corresponding path program 1 times [2021-11-23 03:23:04,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:04,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61029056] [2021-11-23 03:23:04,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:04,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:04,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:05,054 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:23:05,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:05,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61029056] [2021-11-23 03:23:05,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61029056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:23:05,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835771323] [2021-11-23 03:23:05,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:05,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:05,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:05,066 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:23:05,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:23:05,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:05,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-23 03:23:05,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:05,385 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 03:23:05,762 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:23:05,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 59 [2021-11-23 03:23:05,785 INFO L354 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2021-11-23 03:23:05,786 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 49 [2021-11-23 03:23:06,026 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-23 03:23:06,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 77 treesize of output 47 [2021-11-23 03:23:06,039 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 03:23:06,040 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 20 [2021-11-23 03:23:06,088 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:06,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:06,694 INFO L354 Elim1Store]: treesize reduction 14, result has 54.8 percent of original size [2021-11-23 03:23:06,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 431 treesize of output 319 [2021-11-23 03:23:06,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 510 treesize of output 458 [2021-11-23 03:23:07,429 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:07,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835771323] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:07,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822149657] [2021-11-23 03:23:07,432 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 03:23:07,432 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:23:07,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:23:07,432 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:23:07,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:23:07,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,484 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 03:23:07,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 03:23:07,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,518 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:23:07,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:23:07,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,583 INFO L354 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-11-23 03:23:07,583 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 03:23:07,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,639 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-23 03:23:07,640 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 03:23:07,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,695 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:07,696 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 03:23:07,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,710 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 03:23:07,720 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:07,721 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 03:23:07,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:07,734 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 03:23:07,745 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:07,746 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 03:23:07,958 INFO L354 Elim1Store]: treesize reduction 124, result has 24.8 percent of original size [2021-11-23 03:23:07,959 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 03:23:08,056 INFO L354 Elim1Store]: treesize reduction 92, result has 21.4 percent of original size [2021-11-23 03:23:08,057 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 03:23:08,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:08,302 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:23:08,303 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 03:23:08,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:08,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:08,388 INFO L354 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2021-11-23 03:23:08,388 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 03:23:08,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:08,515 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 03:23:08,516 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 03:23:08,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:08,596 INFO L354 Elim1Store]: treesize reduction 60, result has 30.2 percent of original size [2021-11-23 03:23:08,597 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 03:23:08,614 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:08,649 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 03:23:08,649 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 03:23:08,673 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:08,710 INFO L354 Elim1Store]: treesize reduction 51, result has 15.0 percent of original size [2021-11-23 03:23:08,710 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 03:23:08,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:23:08,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:23:09,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:09,004 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:09,005 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 03:23:09,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:09,022 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:09,025 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 03:23:09,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:09,043 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:09,044 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 03:23:09,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2021-11-23 03:23:09,241 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 03:23:09,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 03:23:09,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:23:09,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:23:09,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2021-11-23 03:23:09,464 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 03:23:09,471 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 03:23:09,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2021-11-23 03:23:09,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:23:09,694 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 03:23:09,703 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 03:23:09,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:23:09,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:23:09,832 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:23:11,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '901#(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 03:23:11,877 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:23:11,877 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:23:11,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 14] total 37 [2021-11-23 03:23:11,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933217518] [2021-11-23 03:23:11,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:23:11,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 03:23:11,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:11,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 03:23:11,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1787, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 03:23:11,881 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 38 states, 38 states have (on average 1.5789473684210527) internal successors, (60), 37 states have internal predecessors, (60), 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 03:23:16,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:16,314 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2021-11-23 03:23:16,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 03:23:16,315 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5789473684210527) internal successors, (60), 37 states have internal predecessors, (60), 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 25 [2021-11-23 03:23:16,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:16,316 INFO L225 Difference]: With dead ends: 56 [2021-11-23 03:23:16,316 INFO L226 Difference]: Without dead ends: 36 [2021-11-23 03:23:16,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 32 SyntacticMatches, 10 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1023 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=725, Invalid=3307, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 03:23:16,320 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 269 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:16,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 46 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 250 Invalid, 0 Unknown, 18 Unchecked, 0.6s Time] [2021-11-23 03:23:16,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-23 03:23:16,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2021-11-23 03:23:16,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.15625) internal successors, (37), 32 states have internal predecessors, (37), 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 03:23:16,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-11-23 03:23:16,331 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2021-11-23 03:23:16,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:16,331 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-11-23 03:23:16,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.5789473684210527) internal successors, (60), 37 states have internal predecessors, (60), 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 03:23:16,332 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-11-23 03:23:16,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 03:23:16,333 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:16,333 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 03:23:16,367 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-23 03:23:16,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 03:23:16,561 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:16,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:16,562 INFO L85 PathProgramCache]: Analyzing trace with hash -839898856, now seen corresponding path program 2 times [2021-11-23 03:23:16,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:16,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150415509] [2021-11-23 03:23:16,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:16,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:16,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:17,035 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:23:17,035 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:17,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150415509] [2021-11-23 03:23:17,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150415509] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:23:17,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121814414] [2021-11-23 03:23:17,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:23:17,036 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:17,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:17,042 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:23:17,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eab29b72-9cd1-41be-845c-62c12b8e3f3c/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:23:17,362 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 03:23:17,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:23:17,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-23 03:23:17,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:17,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:23:17,444 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:23:17,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-11-23 03:23:17,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 03:23:17,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 03:23:17,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:17,597 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-23 03:23:17,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 14 [2021-11-23 03:23:17,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:17,724 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:17,734 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 03:23:17,735 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 77 treesize of output 75 [2021-11-23 03:23:17,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:17,742 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:17,752 INFO L354 Elim1Store]: treesize reduction 35, result has 27.1 percent of original size [2021-11-23 03:23:17,752 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 80 treesize of output 72 [2021-11-23 03:23:17,757 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:17,766 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-23 03:23:17,767 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 69 treesize of output 62 [2021-11-23 03:23:18,312 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:23:18,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:20,772 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_DerPreprocessor_19 Int) (v_DerPreprocessor_20 Int) (v_DerPreprocessor_21 Int)) (let ((.cse9 (+ |c_ULTIMATE.start_node_create_~temp~0#1.offset| 4))) (let ((.cse0 (let ((.cse10 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_~temp~0#1.base| (store (store (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_~temp~0#1.base|) .cse9 0) |c_ULTIMATE.start_node_create_~temp~0#1.offset| v_DerPreprocessor_20)))) (store .cse10 v_DerPreprocessor_19 (store (select .cse10 v_DerPreprocessor_19) .cse9 |c_ULTIMATE.start_sll_create_~head~0#1.base|))))) (let ((.cse8 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_~temp~0#1.base| (store (store (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_~temp~0#1.base|) .cse9 0) |c_ULTIMATE.start_node_create_~temp~0#1.offset| v_DerPreprocessor_21))) (.cse6 (select (select .cse0 |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (let ((.cse4 (store (select .cse8 .cse6) .cse9 |c_ULTIMATE.start_sll_create_~head~0#1.offset|))) (let ((.cse3 (store .cse8 .cse6 .cse4))) (let ((.cse7 (select (select .cse3 |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (let ((.cse5 (+ 4 .cse7))) (let ((.cse1 (select (select .cse0 .cse6) .cse5)) (.cse2 (+ (select .cse4 .cse5) 4))) (and (= (select (select .cse0 .cse1) .cse2) 0) (= (select (select .cse3 .cse1) .cse2) 0)))) (not (= v_DerPreprocessor_19 .cse6)) (not (= |c_ULTIMATE.start_node_create_~temp~0#1.offset| .cse7)) (not (= .cse6 |c_ULTIMATE.start_node_create_~temp~0#1.base|)))))))))) is different from false [2021-11-23 03:24:32,459 WARN L227 SmtUtils]: Spent 1.17m on a formula simplification. DAG size of input: 1597 DAG size of output: 555 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-23 03:24:32,462 INFO L354 Elim1Store]: treesize reduction 61045, result has 17.8 percent of original size [2021-11-23 03:24:32,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 31 select indices, 31 select index equivalence classes, 0 disjoint index pairs (out of 465 index pairs), introduced 39 new quantified variables, introduced 465 case distinctions, treesize of input 52438382257 treesize of output 49869542157