./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/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_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash db322df1d89bf1549765f136e3e3b8000484c0c3108c31998992cf725d6dcc20 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:24:19,048 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:24:19,051 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:24:19,098 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:24:19,099 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:24:19,100 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:24:19,103 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:24:19,106 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:24:19,109 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:24:19,111 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:24:19,113 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:24:19,115 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:24:19,116 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:24:19,118 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:24:19,120 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:24:19,122 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:24:19,123 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:24:19,125 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:24:19,128 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:24:19,131 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:24:19,134 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:24:19,136 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:24:19,138 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:24:19,140 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:24:19,145 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:24:19,146 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:24:19,146 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:24:19,148 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:24:19,149 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:24:19,150 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:24:19,151 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:24:19,152 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:24:19,153 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:24:19,155 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:24:19,156 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:24:19,157 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:24:19,158 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:24:19,159 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:24:19,159 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:24:19,161 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:24:19,166 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:24:19,167 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-23 03:24:19,201 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:24:19,202 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:24:19,203 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:24:19,203 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:24:19,204 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:24:19,204 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:24:19,205 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:24:19,205 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:24:19,206 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:24:19,206 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:24:19,207 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:24:19,207 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:24:19,208 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:24:19,208 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:24:19,209 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:24:19,209 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:24:19,209 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:24:19,210 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:24:19,211 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 03:24:19,211 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 03:24:19,212 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:24:19,212 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:24:19,213 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 03:24:19,213 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:24:19,213 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:24:19,214 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:24:19,214 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-23 03:24:19,214 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-23 03:24:19,215 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-23 03:24:19,215 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:24:19,216 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 03:24:19,216 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:24:19,216 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:24:19,217 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:24:19,217 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:24:19,217 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:24:19,218 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:24:19,218 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:24:19,218 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:24:19,219 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:24:19,219 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:24:19,219 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:24:19,219 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_93b8c022-95e8-496b-b3ca-b9f601d4db94/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> db322df1d89bf1549765f136e3e3b8000484c0c3108c31998992cf725d6dcc20 [2021-11-23 03:24:19,564 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:24:19,592 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:24:19,595 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:24:19,597 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:24:19,598 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:24:19,600 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i [2021-11-23 03:24:19,678 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/data/52fba5f15/ff3336d5d9cc4b49bd341de8edda6d94/FLAG66599e29a [2021-11-23 03:24:20,383 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:24:20,384 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i [2021-11-23 03:24:20,416 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/data/52fba5f15/ff3336d5d9cc4b49bd341de8edda6d94/FLAG66599e29a [2021-11-23 03:24:20,588 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/data/52fba5f15/ff3336d5d9cc4b49bd341de8edda6d94 [2021-11-23 03:24:20,593 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:24:20,595 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:24:20,600 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:24:20,601 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:24:20,606 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:24:20,607 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:24:20" (1/1) ... [2021-11-23 03:24:20,611 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c11220 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:20, skipping insertion in model container [2021-11-23 03:24:20,611 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:24:20" (1/1) ... [2021-11-23 03:24:20,625 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:24:20,695 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:24:21,147 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:24:21,157 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:24:21,218 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:24:21,281 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:24:21,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21 WrapperNode [2021-11-23 03:24:21,282 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:24:21,283 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:24:21,283 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:24:21,283 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:24:21,292 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,318 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,377 INFO L137 Inliner]: procedures = 125, calls = 95, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 302 [2021-11-23 03:24:21,389 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:24:21,390 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:24:21,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:24:21,391 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:24:21,401 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,402 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,421 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,422 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,471 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,478 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,488 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,494 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:24:21,504 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:24:21,505 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:24:21,505 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:24:21,506 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (1/1) ... [2021-11-23 03:24:21,515 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:24:21,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:21,549 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:24:21,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:24:21,600 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 03:24:21,603 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 03:24:21,603 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 03:24:21,603 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:24:21,603 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 03:24:21,604 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 03:24:21,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 03:24:21,604 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:24:21,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:24:21,604 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:24:21,604 INFO L130 BoogieDeclarations]: Found specification of procedure append [2021-11-23 03:24:21,605 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2021-11-23 03:24:21,806 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:24:21,808 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:24:22,863 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:24:22,964 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:24:22,964 INFO L301 CfgBuilder]: Removed 11 assume(true) statements. [2021-11-23 03:24:22,969 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:24:22 BoogieIcfgContainer [2021-11-23 03:24:22,970 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:24:22,974 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:24:22,974 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:24:22,978 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:24:22,979 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:24:20" (1/3) ... [2021-11-23 03:24:22,980 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@286c8523 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:24:22, skipping insertion in model container [2021-11-23 03:24:22,980 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:24:21" (2/3) ... [2021-11-23 03:24:22,981 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@286c8523 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:24:22, skipping insertion in model container [2021-11-23 03:24:22,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:24:22" (3/3) ... [2021-11-23 03:24:22,983 INFO L111 eAbstractionObserver]: Analyzing ICFG split_list_test05-2.i [2021-11-23 03:24:22,994 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:24:22,994 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 147 error locations. [2021-11-23 03:24:23,048 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:24:23,056 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:24:23,057 INFO L340 AbstractCegarLoop]: Starting to check reachability of 147 error locations. [2021-11-23 03:24:23,109 INFO L276 IsEmpty]: Start isEmpty. Operand has 293 states, 129 states have (on average 2.356589147286822) internal successors, (304), 278 states have internal predecessors, (304), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:24:23,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2021-11-23 03:24:23,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:23,134 INFO L514 BasicCegarLoop]: trace histogram [1, 1] [2021-11-23 03:24:23,134 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-11-23 03:24:23,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:23,150 INFO L85 PathProgramCache]: Analyzing trace with hash 17550, now seen corresponding path program 1 times [2021-11-23 03:24:23,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:23,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893857509] [2021-11-23 03:24:23,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:23,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:23,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:23,367 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 03:24:23,368 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:23,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893857509] [2021-11-23 03:24:23,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893857509] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:23,370 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:23,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-23 03:24:23,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032861282] [2021-11-23 03:24:23,373 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:23,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:24:23,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:23,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:24:23,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:24:23,418 INFO L87 Difference]: Start difference. First operand has 293 states, 129 states have (on average 2.356589147286822) internal successors, (304), 278 states have internal predecessors, (304), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 03:24:23,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:23,919 INFO L93 Difference]: Finished difference Result 499 states and 552 transitions. [2021-11-23 03:24:23,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:24:23,922 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 2 [2021-11-23 03:24:23,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:23,939 INFO L225 Difference]: With dead ends: 499 [2021-11-23 03:24:23,940 INFO L226 Difference]: Without dead ends: 498 [2021-11-23 03:24:23,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 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 03:24:23,946 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 224 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:23,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [224 Valid, 370 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:24:23,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2021-11-23 03:24:24,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 364. [2021-11-23 03:24:24,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 203 states have (on average 2.3201970443349755) internal successors, (471), 349 states have internal predecessors, (471), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:24:24,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 501 transitions. [2021-11-23 03:24:24,057 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 501 transitions. Word has length 2 [2021-11-23 03:24:24,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:24,057 INFO L470 AbstractCegarLoop]: Abstraction has 364 states and 501 transitions. [2021-11-23 03:24:24,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 03:24:24,058 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 501 transitions. [2021-11-23 03:24:24,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2021-11-23 03:24:24,058 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:24,062 INFO L514 BasicCegarLoop]: trace histogram [1, 1] [2021-11-23 03:24:24,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:24:24,063 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-11-23 03:24:24,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:24,067 INFO L85 PathProgramCache]: Analyzing trace with hash 17551, now seen corresponding path program 1 times [2021-11-23 03:24:24,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:24,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590060351] [2021-11-23 03:24:24,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:24,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:24,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:24,150 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 03:24:24,151 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:24,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590060351] [2021-11-23 03:24:24,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590060351] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:24,153 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:24,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-23 03:24:24,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943961875] [2021-11-23 03:24:24,154 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:24,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:24:24,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:24,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:24:24,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:24:24,157 INFO L87 Difference]: Start difference. First operand 364 states and 501 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 03:24:24,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:24,484 INFO L93 Difference]: Finished difference Result 365 states and 504 transitions. [2021-11-23 03:24:24,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:24:24,485 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 2 [2021-11-23 03:24:24,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:24,488 INFO L225 Difference]: With dead ends: 365 [2021-11-23 03:24:24,489 INFO L226 Difference]: Without dead ends: 365 [2021-11-23 03:24:24,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 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 03:24:24,500 INFO L933 BasicCegarLoop]: 289 mSDtfsCounter, 5 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:24,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 467 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:24:24,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2021-11-23 03:24:24,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 362. [2021-11-23 03:24:24,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 203 states have (on average 2.310344827586207) internal successors, (469), 347 states have internal predecessors, (469), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:24:24,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 499 transitions. [2021-11-23 03:24:24,547 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 499 transitions. Word has length 2 [2021-11-23 03:24:24,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:24,548 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 499 transitions. [2021-11-23 03:24:24,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 03:24:24,548 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 499 transitions. [2021-11-23 03:24:24,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 03:24:24,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:24,549 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:24,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:24:24,550 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting appendErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-11-23 03:24:24,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:24,551 INFO L85 PathProgramCache]: Analyzing trace with hash -268395331, now seen corresponding path program 1 times [2021-11-23 03:24:24,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:24,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338626287] [2021-11-23 03:24:24,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:24,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:24,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:24,609 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 03:24:24,610 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:24,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338626287] [2021-11-23 03:24:24,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338626287] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:24,610 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:24,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:24:24,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631223614] [2021-11-23 03:24:24,611 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:24,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:24:24,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:24,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:24:24,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:24:24,613 INFO L87 Difference]: Start difference. First operand 362 states and 499 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:24,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:24,954 INFO L93 Difference]: Finished difference Result 357 states and 494 transitions. [2021-11-23 03:24:24,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:24:24,955 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-23 03:24:24,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:24,958 INFO L225 Difference]: With dead ends: 357 [2021-11-23 03:24:24,958 INFO L226 Difference]: Without dead ends: 357 [2021-11-23 03:24:24,959 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 03:24:24,960 INFO L933 BasicCegarLoop]: 262 mSDtfsCounter, 39 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:24,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 404 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:24:24,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2021-11-23 03:24:24,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2021-11-23 03:24:25,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 203 states have (on average 2.2857142857142856) internal successors, (464), 342 states have internal predecessors, (464), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:24:25,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 494 transitions. [2021-11-23 03:24:25,019 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 494 transitions. Word has length 8 [2021-11-23 03:24:25,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:25,019 INFO L470 AbstractCegarLoop]: Abstraction has 357 states and 494 transitions. [2021-11-23 03:24:25,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:25,020 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 494 transitions. [2021-11-23 03:24:25,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 03:24:25,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:25,020 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:25,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:24:25,021 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting appendErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-11-23 03:24:25,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:25,022 INFO L85 PathProgramCache]: Analyzing trace with hash -268395330, now seen corresponding path program 1 times [2021-11-23 03:24:25,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:25,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975462610] [2021-11-23 03:24:25,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:25,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:25,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:25,126 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 03:24:25,127 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:25,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975462610] [2021-11-23 03:24:25,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975462610] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:25,129 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:25,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:24:25,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835437784] [2021-11-23 03:24:25,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:25,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:24:25,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:25,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:24:25,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:24:25,135 INFO L87 Difference]: Start difference. First operand 357 states and 494 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:25,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:25,402 INFO L93 Difference]: Finished difference Result 352 states and 489 transitions. [2021-11-23 03:24:25,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:24:25,403 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-23 03:24:25,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:25,406 INFO L225 Difference]: With dead ends: 352 [2021-11-23 03:24:25,406 INFO L226 Difference]: Without dead ends: 352 [2021-11-23 03:24:25,407 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 03:24:25,418 INFO L933 BasicCegarLoop]: 262 mSDtfsCounter, 34 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 415 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:25,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 415 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:24:25,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-11-23 03:24:25,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 352. [2021-11-23 03:24:25,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 203 states have (on average 2.2610837438423643) internal successors, (459), 337 states have internal predecessors, (459), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:24:25,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 489 transitions. [2021-11-23 03:24:25,442 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 489 transitions. Word has length 8 [2021-11-23 03:24:25,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:25,442 INFO L470 AbstractCegarLoop]: Abstraction has 352 states and 489 transitions. [2021-11-23 03:24:25,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:25,443 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 489 transitions. [2021-11-23 03:24:25,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 03:24:25,443 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:25,444 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:25,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:24:25,444 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-11-23 03:24:25,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:25,445 INFO L85 PathProgramCache]: Analyzing trace with hash 269679752, now seen corresponding path program 1 times [2021-11-23 03:24:25,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:25,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710386818] [2021-11-23 03:24:25,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:25,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:25,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:25,569 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 03:24:25,569 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:25,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710386818] [2021-11-23 03:24:25,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [710386818] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:25,570 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:25,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:24:25,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229210620] [2021-11-23 03:24:25,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:25,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:24:25,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:25,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:24:25,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:24:25,573 INFO L87 Difference]: Start difference. First operand 352 states and 489 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:26,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:26,341 INFO L93 Difference]: Finished difference Result 475 states and 526 transitions. [2021-11-23 03:24:26,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:24:26,342 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 03:24:26,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:26,346 INFO L225 Difference]: With dead ends: 475 [2021-11-23 03:24:26,346 INFO L226 Difference]: Without dead ends: 475 [2021-11-23 03:24:26,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:24:26,348 INFO L933 BasicCegarLoop]: 147 mSDtfsCounter, 289 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 633 SdHoareTripleChecker+Invalid, 795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:26,349 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [289 Valid, 633 Invalid, 795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:24:26,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-11-23 03:24:26,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 344. [2021-11-23 03:24:26,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 203 states have (on average 2.2216748768472905) internal successors, (451), 329 states have internal predecessors, (451), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:24:26,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 481 transitions. [2021-11-23 03:24:26,364 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 481 transitions. Word has length 9 [2021-11-23 03:24:26,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:26,364 INFO L470 AbstractCegarLoop]: Abstraction has 344 states and 481 transitions. [2021-11-23 03:24:26,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:26,365 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 481 transitions. [2021-11-23 03:24:26,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 03:24:26,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:26,366 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:26,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:24:26,366 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-11-23 03:24:26,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:26,367 INFO L85 PathProgramCache]: Analyzing trace with hash 269679753, now seen corresponding path program 1 times [2021-11-23 03:24:26,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:26,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158448985] [2021-11-23 03:24:26,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:26,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:26,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:26,474 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 03:24:26,474 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:26,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158448985] [2021-11-23 03:24:26,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158448985] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:26,475 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:26,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:24:26,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338537279] [2021-11-23 03:24:26,475 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:26,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:24:26,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:26,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:24:26,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:24:26,477 INFO L87 Difference]: Start difference. First operand 344 states and 481 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:27,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:27,401 INFO L93 Difference]: Finished difference Result 465 states and 516 transitions. [2021-11-23 03:24:27,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:24:27,402 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 03:24:27,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:27,406 INFO L225 Difference]: With dead ends: 465 [2021-11-23 03:24:27,406 INFO L226 Difference]: Without dead ends: 465 [2021-11-23 03:24:27,407 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:24:27,408 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 730 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 783 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 730 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 783 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:27,408 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [730 Valid, 308 Invalid, 844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 783 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:24:27,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-11-23 03:24:27,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 335. [2021-11-23 03:24:27,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 203 states have (on average 2.1724137931034484) internal successors, (441), 320 states have internal predecessors, (441), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:24:27,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 471 transitions. [2021-11-23 03:24:27,428 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 471 transitions. Word has length 9 [2021-11-23 03:24:27,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:27,429 INFO L470 AbstractCegarLoop]: Abstraction has 335 states and 471 transitions. [2021-11-23 03:24:27,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:27,429 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 471 transitions. [2021-11-23 03:24:27,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 03:24:27,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:27,437 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:27,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:24:27,438 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-11-23 03:24:27,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:27,438 INFO L85 PathProgramCache]: Analyzing trace with hash 2120301909, now seen corresponding path program 1 times [2021-11-23 03:24:27,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:27,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663456005] [2021-11-23 03:24:27,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:27,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:27,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:27,641 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 03:24:27,641 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:27,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663456005] [2021-11-23 03:24:27,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663456005] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:27,642 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:27,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 03:24:27,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737700405] [2021-11-23 03:24:27,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:27,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:24:27,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:27,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:24:27,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:24:27,645 INFO L87 Difference]: Start difference. First operand 335 states and 471 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:28,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:28,125 INFO L93 Difference]: Finished difference Result 352 states and 491 transitions. [2021-11-23 03:24:28,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:24:28,125 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 03:24:28,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:28,129 INFO L225 Difference]: With dead ends: 352 [2021-11-23 03:24:28,129 INFO L226 Difference]: Without dead ends: 352 [2021-11-23 03:24:28,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:24:28,130 INFO L933 BasicCegarLoop]: 256 mSDtfsCounter, 18 mSDsluCounter, 845 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 1032 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:28,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 1032 Invalid, 465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:24:28,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-11-23 03:24:28,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 342. [2021-11-23 03:24:28,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 209 states have (on average 2.1435406698564594) internal successors, (448), 326 states have internal predecessors, (448), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-23 03:24:28,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 480 transitions. [2021-11-23 03:24:28,148 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 480 transitions. Word has length 16 [2021-11-23 03:24:28,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:28,149 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 480 transitions. [2021-11-23 03:24:28,149 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:28,150 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 480 transitions. [2021-11-23 03:24:28,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 03:24:28,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:28,151 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:28,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:24:28,151 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-11-23 03:24:28,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:28,152 INFO L85 PathProgramCache]: Analyzing trace with hash 749666084, now seen corresponding path program 1 times [2021-11-23 03:24:28,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:28,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872184857] [2021-11-23 03:24:28,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:28,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:28,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:28,435 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 03:24:28,436 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:28,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872184857] [2021-11-23 03:24:28,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872184857] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:28,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:28,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 03:24:28,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413182005] [2021-11-23 03:24:28,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:28,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:24:28,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:28,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:24:28,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:24:28,442 INFO L87 Difference]: Start difference. First operand 342 states and 480 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:29,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:29,401 INFO L93 Difference]: Finished difference Result 476 states and 529 transitions. [2021-11-23 03:24:29,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:24:29,402 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-23 03:24:29,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:29,406 INFO L225 Difference]: With dead ends: 476 [2021-11-23 03:24:29,406 INFO L226 Difference]: Without dead ends: 476 [2021-11-23 03:24:29,406 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:24:29,407 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 683 mSDsluCounter, 951 mSDsCounter, 0 mSdLazyCounter, 979 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 698 SdHoareTripleChecker+Valid, 1063 SdHoareTripleChecker+Invalid, 995 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 979 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:29,408 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [698 Valid, 1063 Invalid, 995 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 979 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:24:29,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2021-11-23 03:24:29,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 344. [2021-11-23 03:24:29,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 211 states have (on average 2.132701421800948) internal successors, (450), 328 states have internal predecessors, (450), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-23 03:24:29,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 482 transitions. [2021-11-23 03:24:29,433 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 482 transitions. Word has length 17 [2021-11-23 03:24:29,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:29,433 INFO L470 AbstractCegarLoop]: Abstraction has 344 states and 482 transitions. [2021-11-23 03:24:29,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:29,434 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 482 transitions. [2021-11-23 03:24:29,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 03:24:29,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:29,436 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:29,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:24:29,437 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-11-23 03:24:29,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:29,438 INFO L85 PathProgramCache]: Analyzing trace with hash 1443652774, now seen corresponding path program 1 times [2021-11-23 03:24:29,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:29,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857305188] [2021-11-23 03:24:29,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:29,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:29,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:30,340 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:30,341 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:30,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857305188] [2021-11-23 03:24:30,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857305188] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:30,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734021589] [2021-11-23 03:24:30,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:30,342 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:30,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:30,346 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:30,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93b8c022-95e8-496b-b3ca-b9f601d4db94/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:24:30,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:30,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-23 03:24:30,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:30,616 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 03:24:31,086 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 33 treesize of output 29 [2021-11-23 03:24:31,093 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 29 treesize of output 25 [2021-11-23 03:24:31,242 INFO L354 Elim1Store]: treesize reduction 25, result has 43.2 percent of original size [2021-11-23 03:24:31,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 60 [2021-11-23 03:24:31,274 INFO L354 Elim1Store]: treesize reduction 25, result has 43.2 percent of original size [2021-11-23 03:24:31,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 66 [2021-11-23 03:24:31,590 INFO L354 Elim1Store]: treesize reduction 66, result has 30.5 percent of original size [2021-11-23 03:24:31,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 110 treesize of output 122 [2021-11-23 03:24:31,644 INFO L354 Elim1Store]: treesize reduction 66, result has 30.5 percent of original size [2021-11-23 03:24:31,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 119 treesize of output 131 [2021-11-23 03:24:33,098 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:33,109 INFO L354 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2021-11-23 03:24:33,110 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 147 treesize of output 146 [2021-11-23 03:24:33,608 INFO L354 Elim1Store]: treesize reduction 33, result has 25.0 percent of original size [2021-11-23 03:24:33,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 156 treesize of output 158 [2021-11-23 03:24:33,653 INFO L354 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-11-23 03:24:33,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 155 treesize of output 157 [2021-11-23 03:24:33,851 INFO L354 Elim1Store]: treesize reduction 172, result has 15.3 percent of original size [2021-11-23 03:24:33,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 169 treesize of output 130 [2021-11-23 03:24:33,887 INFO L354 Elim1Store]: treesize reduction 140, result has 16.2 percent of original size [2021-11-23 03:24:33,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 154 treesize of output 124 [2021-11-23 03:24:34,380 INFO L354 Elim1Store]: treesize reduction 172, result has 15.3 percent of original size [2021-11-23 03:24:34,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 165 treesize of output 137 [2021-11-23 03:24:34,425 INFO L354 Elim1Store]: treesize reduction 140, result has 16.2 percent of original size [2021-11-23 03:24:34,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 152 treesize of output 133 [2021-11-23 03:24:34,560 INFO L354 Elim1Store]: treesize reduction 206, result has 16.3 percent of original size [2021-11-23 03:24:34,561 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 4 new quantified variables, introduced 6 case distinctions, treesize of input 174 treesize of output 146 [2021-11-23 03:24:34,613 INFO L354 Elim1Store]: treesize reduction 174, result has 17.1 percent of original size [2021-11-23 03:24:34,613 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 5 new quantified variables, introduced 6 case distinctions, treesize of input 170 treesize of output 151 [2021-11-23 03:24:34,970 INFO L354 Elim1Store]: treesize reduction 198, result has 1.5 percent of original size [2021-11-23 03:24:34,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 190 treesize of output 118 [2021-11-23 03:24:35,002 INFO L354 Elim1Store]: treesize reduction 134, result has 2.2 percent of original size [2021-11-23 03:24:35,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 100 treesize of output 65 [2021-11-23 03:24:35,082 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:35,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:40,542 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 524665 treesize of output 524281 [2021-11-23 03:24:41,626 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 1149587676 treesize of output 1146343644