./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-examples/sanfoundry_24-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-examples/sanfoundry_24-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh --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 7e3ff0b77765ac98635f2070c186c57a6cae0bb79eb8bc9016d9d716e81867aa --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 16:00:32,259 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 16:00:32,260 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 16:00:32,274 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 16:00:32,274 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 16:00:32,275 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 16:00:32,276 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 16:00:32,277 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 16:00:32,278 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 16:00:32,278 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 16:00:32,279 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 16:00:32,280 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 16:00:32,280 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 16:00:32,281 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 16:00:32,282 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 16:00:32,282 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 16:00:32,283 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 16:00:32,284 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 16:00:32,285 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 16:00:32,286 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 16:00:32,287 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 16:00:32,288 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 16:00:32,289 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 16:00:32,290 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 16:00:32,292 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 16:00:32,292 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 16:00:32,293 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 16:00:32,293 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 16:00:32,294 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 16:00:32,294 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 16:00:32,294 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 16:00:32,295 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 16:00:32,296 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 16:00:32,296 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 16:00:32,297 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 16:00:32,297 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 16:00:32,298 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 16:00:32,298 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 16:00:32,298 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 16:00:32,299 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 16:00:32,299 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 16:00:32,300 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-12-14 16:00:32,322 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 16:00:32,322 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 16:00:32,322 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 16:00:32,322 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 16:00:32,323 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 16:00:32,323 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 16:00:32,323 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 16:00:32,323 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 16:00:32,324 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 16:00:32,324 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 16:00:32,324 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 16:00:32,324 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 16:00:32,324 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 16:00:32,324 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 16:00:32,324 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 16:00:32,325 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 16:00:32,325 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 16:00:32,325 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 16:00:32,326 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-14 16:00:32,326 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-14 16:00:32,326 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 16:00:32,326 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 16:00:32,326 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 16:00:32,327 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 16:00:32,327 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 16:00:32,327 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 16:00:32,327 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-12-14 16:00:32,327 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-12-14 16:00:32,327 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-12-14 16:00:32,327 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 16:00:32,328 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-12-14 16:00:32,328 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 16:00:32,328 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 16:00:32,328 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 16:00:32,328 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 16:00:32,328 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 16:00:32,329 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 16:00:32,329 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 16:00:32,329 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 16:00:32,329 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 16:00:32,329 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 16:00:32,329 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 16:00:32,330 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7e3ff0b77765ac98635f2070c186c57a6cae0bb79eb8bc9016d9d716e81867aa [2022-12-14 16:00:32,543 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 16:00:32,563 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 16:00:32,565 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 16:00:32,566 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 16:00:32,566 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 16:00:32,567 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-examples/sanfoundry_24-2.i [2022-12-14 16:00:35,231 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 16:00:35,360 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 16:00:35,361 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/sv-benchmarks/c/array-examples/sanfoundry_24-2.i [2022-12-14 16:00:35,365 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/data/b456827e4/e1a59c2e772745d298e0be829bfcbf02/FLAGd4fa35a69 [2022-12-14 16:00:35,379 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/data/b456827e4/e1a59c2e772745d298e0be829bfcbf02 [2022-12-14 16:00:35,381 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 16:00:35,382 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 16:00:35,384 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 16:00:35,384 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 16:00:35,387 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 16:00:35,387 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,388 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@296b5d70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35, skipping insertion in model container [2022-12-14 16:00:35,388 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,398 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 16:00:35,411 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 16:00:35,529 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/sv-benchmarks/c/array-examples/sanfoundry_24-2.i[808,821] [2022-12-14 16:00:35,543 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 16:00:35,550 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 16:00:35,559 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/sv-benchmarks/c/array-examples/sanfoundry_24-2.i[808,821] [2022-12-14 16:00:35,565 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 16:00:35,578 INFO L208 MainTranslator]: Completed translation [2022-12-14 16:00:35,578 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35 WrapperNode [2022-12-14 16:00:35,578 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 16:00:35,579 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 16:00:35,579 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 16:00:35,579 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 16:00:35,586 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,593 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,613 INFO L138 Inliner]: procedures = 18, calls = 18, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 65 [2022-12-14 16:00:35,613 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 16:00:35,614 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 16:00:35,614 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 16:00:35,614 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 16:00:35,624 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,624 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,626 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,626 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,631 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,634 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,635 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,636 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,638 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 16:00:35,639 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 16:00:35,639 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 16:00:35,639 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 16:00:35,640 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (1/1) ... [2022-12-14 16:00:35,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 16:00:35,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:00:35,665 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 16:00:35,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 16:00:35,700 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 16:00:35,700 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 16:00:35,700 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 16:00:35,701 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 16:00:35,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 16:00:35,701 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 16:00:35,701 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 16:00:35,701 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 16:00:35,701 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 16:00:35,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 16:00:35,758 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 16:00:35,760 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 16:00:35,924 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 16:00:35,966 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 16:00:35,966 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-14 16:00:35,969 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:00:35 BoogieIcfgContainer [2022-12-14 16:00:35,969 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 16:00:35,972 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 16:00:35,972 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 16:00:35,975 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 16:00:35,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 04:00:35" (1/3) ... [2022-12-14 16:00:35,976 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64f18c0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:00:35, skipping insertion in model container [2022-12-14 16:00:35,976 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:00:35" (2/3) ... [2022-12-14 16:00:35,976 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64f18c0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:00:35, skipping insertion in model container [2022-12-14 16:00:35,976 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:00:35" (3/3) ... [2022-12-14 16:00:35,978 INFO L112 eAbstractionObserver]: Analyzing ICFG sanfoundry_24-2.i [2022-12-14 16:00:35,997 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 16:00:35,997 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 12 error locations. [2022-12-14 16:00:36,042 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 16:00:36,050 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@44de2e9b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 16:00:36,051 INFO L358 AbstractCegarLoop]: Starting to check reachability of 12 error locations. [2022-12-14 16:00:36,054 INFO L276 IsEmpty]: Start isEmpty. Operand has 36 states, 20 states have (on average 1.9) internal successors, (38), 32 states have internal predecessors, (38), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 16:00:36,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-12-14 16:00:36,059 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:36,060 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-12-14 16:00:36,060 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:36,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:36,066 INFO L85 PathProgramCache]: Analyzing trace with hash 127174, now seen corresponding path program 1 times [2022-12-14 16:00:36,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:36,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962910314] [2022-12-14 16:00:36,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:36,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:36,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:36,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:36,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:36,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962910314] [2022-12-14 16:00:36,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962910314] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:00:36,226 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:00:36,226 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 16:00:36,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32800291] [2022-12-14 16:00:36,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:00:36,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 16:00:36,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:36,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 16:00:36,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 16:00:36,260 INFO L87 Difference]: Start difference. First operand has 36 states, 20 states have (on average 1.9) internal successors, (38), 32 states have internal predecessors, (38), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2022-12-14 16:00:36,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:36,319 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2022-12-14 16:00:36,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 16:00:36,321 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2022-12-14 16:00:36,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:36,327 INFO L225 Difference]: With dead ends: 31 [2022-12-14 16:00:36,327 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 16:00:36,329 INFO L412 NwaCegarLoop]: 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 [2022-12-14 16:00:36,332 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 22 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:36,333 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 26 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:00:36,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 16:00:36,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-12-14 16:00:36,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.55) internal successors, (31), 26 states have internal predecessors, (31), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 16:00:36,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2022-12-14 16:00:36,359 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 3 [2022-12-14 16:00:36,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:36,359 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2022-12-14 16:00:36,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2022-12-14 16:00:36,360 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2022-12-14 16:00:36,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-12-14 16:00:36,360 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:36,360 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-12-14 16:00:36,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 16:00:36,361 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:36,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:36,362 INFO L85 PathProgramCache]: Analyzing trace with hash 127175, now seen corresponding path program 1 times [2022-12-14 16:00:36,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:36,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322211106] [2022-12-14 16:00:36,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:36,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:36,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:36,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:36,477 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:36,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322211106] [2022-12-14 16:00:36,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1322211106] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:00:36,477 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:00:36,477 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 16:00:36,477 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372727744] [2022-12-14 16:00:36,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:00:36,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 16:00:36,479 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:36,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 16:00:36,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 16:00:36,480 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2022-12-14 16:00:36,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:36,538 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2022-12-14 16:00:36,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 16:00:36,538 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2022-12-14 16:00:36,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:36,539 INFO L225 Difference]: With dead ends: 46 [2022-12-14 16:00:36,539 INFO L226 Difference]: Without dead ends: 46 [2022-12-14 16:00:36,540 INFO L412 NwaCegarLoop]: 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 [2022-12-14 16:00:36,541 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 12 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:36,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 37 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:00:36,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-12-14 16:00:36,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2022-12-14 16:00:36,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 36 states have internal predecessors, (46), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 16:00:36,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2022-12-14 16:00:36,548 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 3 [2022-12-14 16:00:36,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:36,549 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2022-12-14 16:00:36,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2022-12-14 16:00:36,549 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2022-12-14 16:00:36,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 16:00:36,549 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:36,549 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2022-12-14 16:00:36,550 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 16:00:36,550 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:36,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:36,551 INFO L85 PathProgramCache]: Analyzing trace with hash 122301027, now seen corresponding path program 1 times [2022-12-14 16:00:36,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:36,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845943822] [2022-12-14 16:00:36,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:36,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:36,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:36,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:36,671 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:36,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845943822] [2022-12-14 16:00:36,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845943822] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:00:36,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265695429] [2022-12-14 16:00:36,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:36,672 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:36,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:00:36,673 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:00:36,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 16:00:36,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:36,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 16:00:36,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:00:36,782 INFO L350 Elim1Store]: Elim1 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 [2022-12-14 16:00:36,822 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:36,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:00:36,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:36,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265695429] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:00:36,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [869338606] [2022-12-14 16:00:36,888 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-12-14 16:00:36,888 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:00:36,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:00:36,895 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:00:36,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:00:36,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:36,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:36,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:00:36,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:36,982 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 16:00:37,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:37,087 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:00:37,110 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 16:00:37,111 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 210 treesize of output 209 [2022-12-14 16:00:37,303 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:00:37,328 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:00:37,343 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:00:37,607 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '224#(and (not (<= (+ |ULTIMATE.start_main_~#array~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#array~0#1.base|))) (<= 0 |ULTIMATE.start_main_~num~0#1|) (<= |ULTIMATE.start_main_#t~nondet3#1| 2147483647) (<= |ULTIMATE.start_main_~num~0#1| 2147483647) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet3#1|)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 16:00:37,607 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:00:37,608 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:00:37,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2022-12-14 16:00:37,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139551161] [2022-12-14 16:00:37,608 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:00:37,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 16:00:37,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:37,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 16:00:37,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2022-12-14 16:00:37,610 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 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) [2022-12-14 16:00:37,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:37,783 INFO L93 Difference]: Finished difference Result 90 states and 123 transitions. [2022-12-14 16:00:37,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 16:00:37,784 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-12-14 16:00:37,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:37,786 INFO L225 Difference]: With dead ends: 90 [2022-12-14 16:00:37,786 INFO L226 Difference]: Without dead ends: 90 [2022-12-14 16:00:37,786 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2022-12-14 16:00:37,787 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 72 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:37,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 77 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:00:37,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-12-14 16:00:37,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 82. [2022-12-14 16:00:37,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 68 states have (on average 1.3970588235294117) internal successors, (95), 72 states have internal predecessors, (95), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-12-14 16:00:37,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 111 transitions. [2022-12-14 16:00:37,797 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 111 transitions. Word has length 5 [2022-12-14 16:00:37,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:37,797 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 111 transitions. [2022-12-14 16:00:37,797 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 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) [2022-12-14 16:00:37,797 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 111 transitions. [2022-12-14 16:00:37,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 16:00:37,798 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:37,798 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-12-14 16:00:37,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 16:00:37,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:38,000 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:38,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:38,001 INFO L85 PathProgramCache]: Analyzing trace with hash 125258153, now seen corresponding path program 1 times [2022-12-14 16:00:38,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:38,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664123245] [2022-12-14 16:00:38,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:38,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:38,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:38,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:38,172 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:38,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664123245] [2022-12-14 16:00:38,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664123245] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:00:38,172 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:00:38,172 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 16:00:38,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743564523] [2022-12-14 16:00:38,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:00:38,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 16:00:38,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:38,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 16:00:38,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 16:00:38,177 INFO L87 Difference]: Start difference. First operand 82 states and 111 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:00:38,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:38,205 INFO L93 Difference]: Finished difference Result 81 states and 110 transitions. [2022-12-14 16:00:38,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 16:00:38,206 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-12-14 16:00:38,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:38,207 INFO L225 Difference]: With dead ends: 81 [2022-12-14 16:00:38,207 INFO L226 Difference]: Without dead ends: 80 [2022-12-14 16:00:38,208 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 16:00:38,209 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 19 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:38,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 41 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:00:38,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-12-14 16:00:38,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2022-12-14 16:00:38,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 67 states have (on average 1.328358208955224) internal successors, (89), 70 states have internal predecessors, (89), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-12-14 16:00:38,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 105 transitions. [2022-12-14 16:00:38,219 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 105 transitions. Word has length 5 [2022-12-14 16:00:38,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:38,220 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 105 transitions. [2022-12-14 16:00:38,220 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:00:38,220 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 105 transitions. [2022-12-14 16:00:38,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 16:00:38,221 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:38,221 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1] [2022-12-14 16:00:38,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 16:00:38,221 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:38,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:38,222 INFO L85 PathProgramCache]: Analyzing trace with hash 1340385396, now seen corresponding path program 1 times [2022-12-14 16:00:38,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:38,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768301581] [2022-12-14 16:00:38,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:38,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:38,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:38,294 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:00:38,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:38,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768301581] [2022-12-14 16:00:38,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [768301581] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:00:38,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234104806] [2022-12-14 16:00:38,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:38,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:38,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:00:38,295 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:00:38,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 16:00:38,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:38,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 16:00:38,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:00:38,391 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:38,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:00:38,428 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2022-12-14 16:00:38,460 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:38,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234104806] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:00:38,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [479050507] [2022-12-14 16:00:38,462 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 16:00:38,462 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:00:38,462 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:00:38,463 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:00:38,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:00:38,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:38,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:38,480 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:00:38,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:38,505 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 16:00:38,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:38,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:38,587 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 16:00:38,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 217 treesize of output 205 [2022-12-14 16:00:38,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:00:38,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:00:38,775 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:00:39,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [479050507] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:00:39,265 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:00:39,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 4, 4] total 14 [2022-12-14 16:00:39,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343325006] [2022-12-14 16:00:39,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:00:39,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 16:00:39,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:39,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 16:00:39,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=172, Unknown=0, NotChecked=0, Total=240 [2022-12-14 16:00:39,267 INFO L87 Difference]: Start difference. First operand 80 states and 105 transitions. Second operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 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) [2022-12-14 16:00:39,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:39,515 INFO L93 Difference]: Finished difference Result 101 states and 133 transitions. [2022-12-14 16:00:39,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 16:00:39,515 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 16:00:39,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:39,517 INFO L225 Difference]: With dead ends: 101 [2022-12-14 16:00:39,517 INFO L226 Difference]: Without dead ends: 101 [2022-12-14 16:00:39,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2022-12-14 16:00:39,518 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 13 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:39,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 71 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:00:39,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-12-14 16:00:39,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 81. [2022-12-14 16:00:39,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 68 states have (on average 1.338235294117647) internal successors, (91), 71 states have internal predecessors, (91), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-12-14 16:00:39,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 107 transitions. [2022-12-14 16:00:39,528 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 107 transitions. Word has length 8 [2022-12-14 16:00:39,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:39,528 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 107 transitions. [2022-12-14 16:00:39,528 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 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) [2022-12-14 16:00:39,529 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 107 transitions. [2022-12-14 16:00:39,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 16:00:39,529 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:39,529 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:00:39,534 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 16:00:39,730 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:39,731 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:39,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:39,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1318508829, now seen corresponding path program 1 times [2022-12-14 16:00:39,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:39,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807238227] [2022-12-14 16:00:39,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:39,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:39,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:39,855 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:39,856 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:39,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807238227] [2022-12-14 16:00:39,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1807238227] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:00:39,856 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:00:39,856 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 16:00:39,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541372937] [2022-12-14 16:00:39,857 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:00:39,857 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 16:00:39,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:39,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 16:00:39,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 16:00:39,858 INFO L87 Difference]: Start difference. First operand 81 states and 107 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2022-12-14 16:00:39,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:39,897 INFO L93 Difference]: Finished difference Result 98 states and 126 transitions. [2022-12-14 16:00:39,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 16:00:39,898 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 10 [2022-12-14 16:00:39,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:39,898 INFO L225 Difference]: With dead ends: 98 [2022-12-14 16:00:39,899 INFO L226 Difference]: Without dead ends: 95 [2022-12-14 16:00:39,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 16:00:39,899 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 14 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:39,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 51 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:00:39,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-12-14 16:00:39,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 81. [2022-12-14 16:00:39,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 68 states have (on average 1.2941176470588236) internal successors, (88), 71 states have internal predecessors, (88), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-12-14 16:00:39,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 104 transitions. [2022-12-14 16:00:39,904 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 104 transitions. Word has length 10 [2022-12-14 16:00:39,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:39,904 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 104 transitions. [2022-12-14 16:00:39,904 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2022-12-14 16:00:39,904 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 104 transitions. [2022-12-14 16:00:39,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 16:00:39,905 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:39,905 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1] [2022-12-14 16:00:39,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-12-14 16:00:39,905 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:39,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:39,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1656091337, now seen corresponding path program 2 times [2022-12-14 16:00:39,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:39,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855179591] [2022-12-14 16:00:39,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:39,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:39,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:40,037 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:40,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:40,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855179591] [2022-12-14 16:00:40,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1855179591] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:00:40,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317672470] [2022-12-14 16:00:40,038 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:00:40,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:40,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:00:40,039 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:00:40,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 16:00:40,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 16:00:40,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:00:40,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 16:00:40,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:00:40,090 INFO L350 Elim1Store]: Elim1 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 [2022-12-14 16:00:40,194 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:40,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:00:40,328 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:40,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317672470] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:00:40,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [173974541] [2022-12-14 16:00:40,330 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-12-14 16:00:40,330 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:00:40,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:00:40,330 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:00:40,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:00:40,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:40,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:40,345 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:00:40,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:40,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 16:00:40,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:40,431 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:00:40,452 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 16:00:40,452 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 200 treesize of output 199 [2022-12-14 16:00:40,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:00:40,533 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:00:40,637 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1068#(and (not (<= (+ |ULTIMATE.start_main_~#array~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#array~0#1.base|))) (<= |ULTIMATE.start_main_#t~nondet3#1| 2147483647) (<= |ULTIMATE.start_main_~num~0#1| 2147483647) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet3#1|)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~num~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 16:00:40,638 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:00:40,638 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:00:40,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2022-12-14 16:00:40,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139571534] [2022-12-14 16:00:40,638 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:00:40,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 16:00:40,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:40,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 16:00:40,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=278, Unknown=0, NotChecked=0, Total=380 [2022-12-14 16:00:40,640 INFO L87 Difference]: Start difference. First operand 81 states and 104 transitions. Second operand has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 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) [2022-12-14 16:00:41,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:41,242 INFO L93 Difference]: Finished difference Result 224 states and 298 transitions. [2022-12-14 16:00:41,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 16:00:41,242 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 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 11 [2022-12-14 16:00:41,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:41,244 INFO L225 Difference]: With dead ends: 224 [2022-12-14 16:00:41,244 INFO L226 Difference]: Without dead ends: 224 [2022-12-14 16:00:41,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=212, Invalid=544, Unknown=0, NotChecked=0, Total=756 [2022-12-14 16:00:41,245 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 247 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 674 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 674 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:41,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [251 Valid, 298 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 674 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 16:00:41,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2022-12-14 16:00:41,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 177. [2022-12-14 16:00:41,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 152 states have (on average 1.2894736842105263) internal successors, (196), 155 states have internal predecessors, (196), 20 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-12-14 16:00:41,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 236 transitions. [2022-12-14 16:00:41,253 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 236 transitions. Word has length 11 [2022-12-14 16:00:41,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:41,253 INFO L495 AbstractCegarLoop]: Abstraction has 177 states and 236 transitions. [2022-12-14 16:00:41,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 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) [2022-12-14 16:00:41,253 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 236 transitions. [2022-12-14 16:00:41,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 16:00:41,253 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:41,253 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:00:41,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-12-14 16:00:41,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 16:00:41,455 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:41,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:41,456 INFO L85 PathProgramCache]: Analyzing trace with hash -648665657, now seen corresponding path program 1 times [2022-12-14 16:00:41,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:41,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316969196] [2022-12-14 16:00:41,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:41,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:41,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:41,723 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:00:41,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:41,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316969196] [2022-12-14 16:00:41,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316969196] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:00:41,723 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:00:41,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-12-14 16:00:41,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989565357] [2022-12-14 16:00:41,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:00:41,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 16:00:41,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:41,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 16:00:41,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-12-14 16:00:41,725 INFO L87 Difference]: Start difference. First operand 177 states and 236 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 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) [2022-12-14 16:00:41,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:41,836 INFO L93 Difference]: Finished difference Result 312 states and 409 transitions. [2022-12-14 16:00:41,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 16:00:41,836 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 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 12 [2022-12-14 16:00:41,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:41,838 INFO L225 Difference]: With dead ends: 312 [2022-12-14 16:00:41,838 INFO L226 Difference]: Without dead ends: 312 [2022-12-14 16:00:41,838 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2022-12-14 16:00:41,839 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 25 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:41,839 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 137 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:00:41,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2022-12-14 16:00:41,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 181. [2022-12-14 16:00:41,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 155 states have (on average 1.2838709677419355) internal successors, (199), 158 states have internal predecessors, (199), 20 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-12-14 16:00:41,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 239 transitions. [2022-12-14 16:00:41,852 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 239 transitions. Word has length 12 [2022-12-14 16:00:41,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:41,853 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 239 transitions. [2022-12-14 16:00:41,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 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) [2022-12-14 16:00:41,853 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 239 transitions. [2022-12-14 16:00:41,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 16:00:41,854 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:41,854 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:00:41,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-12-14 16:00:41,854 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:41,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:41,854 INFO L85 PathProgramCache]: Analyzing trace with hash -807030572, now seen corresponding path program 1 times [2022-12-14 16:00:41,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:41,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832716145] [2022-12-14 16:00:41,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:41,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:41,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:41,993 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 16:00:41,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:41,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832716145] [2022-12-14 16:00:41,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832716145] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:00:41,994 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:00:41,994 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-12-14 16:00:41,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404853465] [2022-12-14 16:00:41,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:00:41,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 16:00:41,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:41,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 16:00:41,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-12-14 16:00:41,995 INFO L87 Difference]: Start difference. First operand 181 states and 239 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 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) [2022-12-14 16:00:42,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:42,081 INFO L93 Difference]: Finished difference Result 237 states and 304 transitions. [2022-12-14 16:00:42,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 16:00:42,082 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 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 [2022-12-14 16:00:42,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:42,083 INFO L225 Difference]: With dead ends: 237 [2022-12-14 16:00:42,083 INFO L226 Difference]: Without dead ends: 237 [2022-12-14 16:00:42,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2022-12-14 16:00:42,083 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 14 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:42,083 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 101 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:00:42,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-12-14 16:00:42,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 179. [2022-12-14 16:00:42,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 154 states have (on average 1.2792207792207793) internal successors, (197), 156 states have internal predecessors, (197), 20 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-12-14 16:00:42,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 237 transitions. [2022-12-14 16:00:42,089 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 237 transitions. Word has length 17 [2022-12-14 16:00:42,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:42,089 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 237 transitions. [2022-12-14 16:00:42,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 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) [2022-12-14 16:00:42,089 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 237 transitions. [2022-12-14 16:00:42,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 16:00:42,090 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:42,090 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 16:00:42,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-12-14 16:00:42,090 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:42,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:42,090 INFO L85 PathProgramCache]: Analyzing trace with hash 1357012611, now seen corresponding path program 1 times [2022-12-14 16:00:42,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:42,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235719120] [2022-12-14 16:00:42,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:42,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:42,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:42,199 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-12-14 16:00:42,199 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:42,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235719120] [2022-12-14 16:00:42,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235719120] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:00:42,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088439530] [2022-12-14 16:00:42,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:42,200 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:42,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:00:42,201 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:00:42,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 16:00:42,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:42,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 16:00:42,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:00:42,355 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:42,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:00:42,418 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-12-14 16:00:42,518 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:42,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088439530] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:00:42,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [714712026] [2022-12-14 16:00:42,521 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 16:00:42,521 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:00:42,521 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:00:42,521 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:00:42,521 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:00:42,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:42,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:42,538 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:00:42,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:42,562 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 16:00:42,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:42,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:42,645 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 16:00:42,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 195 [2022-12-14 16:00:42,686 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:00:42,796 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:00:42,982 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2546#(and (not (<= (+ |ULTIMATE.start_main_~#array~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#array~0#1.base|))) (<= |ULTIMATE.start_main_~num~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~num~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 16:00:42,982 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:00:42,982 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:00:42,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 8, 8] total 19 [2022-12-14 16:00:42,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302770021] [2022-12-14 16:00:42,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:00:42,983 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-12-14 16:00:42,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:42,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-12-14 16:00:42,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=476, Unknown=0, NotChecked=0, Total=650 [2022-12-14 16:00:42,984 INFO L87 Difference]: Start difference. First operand 179 states and 237 transitions. Second operand has 21 states, 20 states have (on average 2.3) internal successors, (46), 20 states have internal predecessors, (46), 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) [2022-12-14 16:00:43,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:43,307 INFO L93 Difference]: Finished difference Result 234 states and 311 transitions. [2022-12-14 16:00:43,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 16:00:43,307 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.3) internal successors, (46), 20 states have internal predecessors, (46), 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 18 [2022-12-14 16:00:43,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:43,309 INFO L225 Difference]: With dead ends: 234 [2022-12-14 16:00:43,309 INFO L226 Difference]: Without dead ends: 234 [2022-12-14 16:00:43,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=237, Invalid=633, Unknown=0, NotChecked=0, Total=870 [2022-12-14 16:00:43,311 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 287 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:43,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [291 Valid, 208 Invalid, 486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 16:00:43,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2022-12-14 16:00:43,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 179. [2022-12-14 16:00:43,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 154 states have (on average 1.2792207792207793) internal successors, (197), 156 states have internal predecessors, (197), 20 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-12-14 16:00:43,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 237 transitions. [2022-12-14 16:00:43,320 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 237 transitions. Word has length 18 [2022-12-14 16:00:43,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:43,320 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 237 transitions. [2022-12-14 16:00:43,321 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.3) internal successors, (46), 20 states have internal predecessors, (46), 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) [2022-12-14 16:00:43,321 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 237 transitions. [2022-12-14 16:00:43,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 16:00:43,323 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:43,323 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 1, 1] [2022-12-14 16:00:43,328 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 16:00:43,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 16:00:43,523 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:43,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:43,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1186973151, now seen corresponding path program 3 times [2022-12-14 16:00:43,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:43,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351127405] [2022-12-14 16:00:43,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:43,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:43,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:43,815 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:43,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:43,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351127405] [2022-12-14 16:00:43,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1351127405] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:00:43,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242678748] [2022-12-14 16:00:43,816 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:00:43,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:43,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:00:43,817 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:00:43,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 16:00:43,908 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:00:43,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:00:43,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 16:00:43,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:00:43,922 INFO L350 Elim1Store]: Elim1 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 [2022-12-14 16:00:44,246 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:44,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:00:44,566 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:44,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242678748] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:00:44,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [427078373] [2022-12-14 16:00:44,568 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-12-14 16:00:44,568 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:00:44,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:00:44,569 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:00:44,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:00:44,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:44,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:44,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:00:44,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:44,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 16:00:44,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:44,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:44,666 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 16:00:44,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 195 [2022-12-14 16:00:44,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:00:44,712 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:00:44,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3139#(and (not (<= (+ |ULTIMATE.start_main_~#array~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#array~0#1.base|))) (<= |ULTIMATE.start_main_#t~nondet3#1| 2147483647) (<= |ULTIMATE.start_main_~num~0#1| 2147483647) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet3#1|)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~num~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 16:00:44,858 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:00:44,858 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:00:44,859 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2022-12-14 16:00:44,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327465136] [2022-12-14 16:00:44,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:00:44,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 16:00:44,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:44,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 16:00:44,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1087, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 16:00:44,861 INFO L87 Difference]: Start difference. First operand 179 states and 237 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 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) [2022-12-14 16:00:47,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:47,133 INFO L93 Difference]: Finished difference Result 546 states and 736 transitions. [2022-12-14 16:00:47,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 16:00:47,134 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 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 23 [2022-12-14 16:00:47,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:47,135 INFO L225 Difference]: With dead ends: 546 [2022-12-14 16:00:47,135 INFO L226 Difference]: Without dead ends: 546 [2022-12-14 16:00:47,136 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 596 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=659, Invalid=1597, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 16:00:47,136 INFO L413 NwaCegarLoop]: 138 mSDtfsCounter, 1055 mSDsluCounter, 1261 mSDsCounter, 0 mSdLazyCounter, 3680 mSolverCounterSat, 589 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1079 SdHoareTripleChecker+Valid, 1399 SdHoareTripleChecker+Invalid, 4269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 589 IncrementalHoareTripleChecker+Valid, 3680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:47,136 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1079 Valid, 1399 Invalid, 4269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [589 Valid, 3680 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-12-14 16:00:47,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2022-12-14 16:00:47,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 371. [2022-12-14 16:00:47,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 371 states, 322 states have (on average 1.2826086956521738) internal successors, (413), 324 states have internal predecessors, (413), 44 states have call successors, (44), 2 states have call predecessors, (44), 2 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2022-12-14 16:00:47,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 501 transitions. [2022-12-14 16:00:47,144 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 501 transitions. Word has length 23 [2022-12-14 16:00:47,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:47,144 INFO L495 AbstractCegarLoop]: Abstraction has 371 states and 501 transitions. [2022-12-14 16:00:47,144 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 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) [2022-12-14 16:00:47,144 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 501 transitions. [2022-12-14 16:00:47,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 16:00:47,146 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:47,146 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 5, 4, 4, 4, 1, 1, 1] [2022-12-14 16:00:47,151 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 16:00:47,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:47,347 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:47,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:47,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1251100676, now seen corresponding path program 2 times [2022-12-14 16:00:47,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:47,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983999461] [2022-12-14 16:00:47,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:47,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:47,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:47,548 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-12-14 16:00:47,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:47,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983999461] [2022-12-14 16:00:47,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [983999461] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:00:47,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362611552] [2022-12-14 16:00:47,549 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:00:47,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:47,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:00:47,550 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:00:47,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 16:00:47,597 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 16:00:47,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:00:47,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 16:00:47,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:00:47,665 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 21 proven. 4 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2022-12-14 16:00:47,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:00:47,795 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2022-12-14 16:00:47,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362611552] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:00:47,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1495558666] [2022-12-14 16:00:47,797 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 16:00:47,797 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:00:47,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:00:47,797 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:00:47,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:00:47,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:47,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:47,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:00:47,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:47,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 16:00:47,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:47,879 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:00:47,899 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 16:00:47,900 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 200 treesize of output 199 [2022-12-14 16:00:47,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:00:48,006 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:00:48,380 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4343#(and (not (<= (+ |ULTIMATE.start_main_~#array~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#array~0#1.base|))) (<= |ULTIMATE.start_main_~num~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~num~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 16:00:48,380 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:00:48,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:00:48,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 17 [2022-12-14 16:00:48,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201211884] [2022-12-14 16:00:48,380 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:00:48,380 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 16:00:48,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:48,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 16:00:48,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2022-12-14 16:00:48,381 INFO L87 Difference]: Start difference. First operand 371 states and 501 transitions. Second operand has 18 states, 17 states have (on average 2.764705882352941) internal successors, (47), 18 states have internal predecessors, (47), 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) [2022-12-14 16:00:48,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:48,799 INFO L93 Difference]: Finished difference Result 440 states and 595 transitions. [2022-12-14 16:00:48,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 16:00:48,799 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.764705882352941) internal successors, (47), 18 states have internal predecessors, (47), 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 42 [2022-12-14 16:00:48,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:48,800 INFO L225 Difference]: With dead ends: 440 [2022-12-14 16:00:48,800 INFO L226 Difference]: Without dead ends: 48 [2022-12-14 16:00:48,800 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 104 SyntacticMatches, 5 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=245, Invalid=811, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 16:00:48,801 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 408 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 408 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:48,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [408 Valid, 205 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 463 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 16:00:48,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-12-14 16:00:48,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-12-14 16:00:48,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 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) [2022-12-14 16:00:48,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2022-12-14 16:00:48,802 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 42 [2022-12-14 16:00:48,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:48,802 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2022-12-14 16:00:48,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.764705882352941) internal successors, (47), 18 states have internal predecessors, (47), 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) [2022-12-14 16:00:48,802 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2022-12-14 16:00:48,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 16:00:48,803 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:48,803 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 1, 1] [2022-12-14 16:00:48,808 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 16:00:49,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 16:00:49,004 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:49,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:49,005 INFO L85 PathProgramCache]: Analyzing trace with hash 1826489135, now seen corresponding path program 4 times [2022-12-14 16:00:49,006 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:49,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850165362] [2022-12-14 16:00:49,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:49,006 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:49,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:49,698 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:49,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:49,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850165362] [2022-12-14 16:00:49,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850165362] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:00:49,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [821034682] [2022-12-14 16:00:49,698 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:00:49,698 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:49,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:00:49,699 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:00:49,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 16:00:49,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:49,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 51 conjunts are in the unsatisfiable core [2022-12-14 16:00:49,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:00:49,772 INFO L350 Elim1Store]: Elim1 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 [2022-12-14 16:00:50,529 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:50,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:00:51,552 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:51,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [821034682] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:00:51,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318617348] [2022-12-14 16:00:51,554 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-12-14 16:00:51,554 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:00:51,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:00:51,554 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:00:51,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:00:51,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:51,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:51,566 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:00:51,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:51,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 16:00:51,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:00:51,657 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:00:51,677 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 16:00:51,677 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 200 treesize of output 199 [2022-12-14 16:00:51,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:00:51,766 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:00:52,001 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5202#(and (not (<= (+ |ULTIMATE.start_main_~#array~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#array~0#1.base|))) (<= |ULTIMATE.start_main_#t~nondet3#1| 2147483647) (<= |ULTIMATE.start_main_~num~0#1| 2147483647) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet3#1|)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~num~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 16:00:52,001 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:00:52,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:00:52,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 68 [2022-12-14 16:00:52,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060082566] [2022-12-14 16:00:52,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:00:52,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-12-14 16:00:52,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:00:52,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-12-14 16:00:52,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1203, Invalid=4053, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 16:00:52,007 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand has 70 states, 69 states have (on average 2.0144927536231885) internal successors, (139), 69 states have internal predecessors, (139), 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) [2022-12-14 16:00:54,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:00:54,757 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2022-12-14 16:00:54,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 16:00:54,757 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 2.0144927536231885) internal successors, (139), 69 states have internal predecessors, (139), 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 47 [2022-12-14 16:00:54,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:00:54,757 INFO L225 Difference]: With dead ends: 96 [2022-12-14 16:00:54,758 INFO L226 Difference]: Without dead ends: 96 [2022-12-14 16:00:54,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2599 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2743, Invalid=6187, Unknown=0, NotChecked=0, Total=8930 [2022-12-14 16:00:54,759 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1605 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 1606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1605 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 16:00:54,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 1 Invalid, 1606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1605 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 16:00:54,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-12-14 16:00:54,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2022-12-14 16:00:54,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0105263157894737) internal successors, (96), 95 states have internal predecessors, (96), 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) [2022-12-14 16:00:54,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2022-12-14 16:00:54,761 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 47 [2022-12-14 16:00:54,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:00:54,761 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2022-12-14 16:00:54,761 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 69 states have (on average 2.0144927536231885) internal successors, (139), 69 states have internal predecessors, (139), 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) [2022-12-14 16:00:54,761 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2022-12-14 16:00:54,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-12-14 16:00:54,764 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:00:54,764 INFO L195 NwaCegarLoop]: trace histogram [47, 46, 1, 1] [2022-12-14 16:00:54,768 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 16:00:54,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 16:00:54,964 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:00:54,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:00:54,965 INFO L85 PathProgramCache]: Analyzing trace with hash 1094561231, now seen corresponding path program 5 times [2022-12-14 16:00:54,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:00:54,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361940992] [2022-12-14 16:00:54,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:00:54,965 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:00:55,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:00:56,768 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:00:56,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:00:56,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361940992] [2022-12-14 16:00:56,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1361940992] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:00:56,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870274817] [2022-12-14 16:00:56,769 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:00:56,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:00:56,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:00:56,770 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:00:56,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 16:01:23,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2022-12-14 16:01:23,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:01:23,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 53 conjunts are in the unsatisfiable core [2022-12-14 16:01:23,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:01:23,970 INFO L350 Elim1Store]: Elim1 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 [2022-12-14 16:01:26,894 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:01:26,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:01:32,202 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:01:32,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870274817] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:01:32,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [563490088] [2022-12-14 16:01:32,203 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-12-14 16:01:32,204 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:01:32,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:01:32,204 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:01:32,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:01:32,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:01:32,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:01:32,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:01:32,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:01:32,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 16:01:32,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:01:32,270 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:01:32,290 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 16:01:32,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 200 treesize of output 199 [2022-12-14 16:01:32,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:01:32,339 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:01:32,675 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6148#(and (not (<= (+ |ULTIMATE.start_main_~#array~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#array~0#1.base|))) (<= |ULTIMATE.start_main_#t~nondet3#1| 2147483647) (<= |ULTIMATE.start_main_~num~0#1| 2147483647) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet3#1|)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~num~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 16:01:32,675 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:01:32,675 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:01:32,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 141 [2022-12-14 16:01:32,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109914013] [2022-12-14 16:01:32,676 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:01:32,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-12-14 16:01:32,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:01:32,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-12-14 16:01:32,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7861, Invalid=13309, Unknown=0, NotChecked=0, Total=21170 [2022-12-14 16:01:32,683 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand has 143 states, 142 states have (on average 2.007042253521127) internal successors, (285), 142 states have internal predecessors, (285), 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) [2022-12-14 16:01:37,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:01:37,904 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2022-12-14 16:01:37,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-12-14 16:01:37,904 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 142 states have (on average 2.007042253521127) internal successors, (285), 142 states have internal predecessors, (285), 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 95 [2022-12-14 16:01:37,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:01:37,905 INFO L225 Difference]: With dead ends: 192 [2022-12-14 16:01:37,905 INFO L226 Difference]: Without dead ends: 192 [2022-12-14 16:01:37,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2579 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=12323, Invalid=24349, Unknown=0, NotChecked=0, Total=36672 [2022-12-14 16:01:37,912 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2678 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 2679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2678 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:01:37,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 1 Invalid, 2679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2678 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 16:01:37,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-12-14 16:01:37,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2022-12-14 16:01:37,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 191 states have (on average 1.0052356020942408) internal successors, (192), 191 states have internal predecessors, (192), 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) [2022-12-14 16:01:37,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2022-12-14 16:01:37,916 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 95 [2022-12-14 16:01:37,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:01:37,916 INFO L495 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2022-12-14 16:01:37,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 142 states have (on average 2.007042253521127) internal successors, (285), 142 states have internal predecessors, (285), 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) [2022-12-14 16:01:37,917 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2022-12-14 16:01:37,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2022-12-14 16:01:37,919 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:01:37,919 INFO L195 NwaCegarLoop]: trace histogram [95, 94, 1, 1] [2022-12-14 16:01:37,929 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 16:01:38,119 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:01:38,120 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:01:38,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:01:38,122 INFO L85 PathProgramCache]: Analyzing trace with hash -313933041, now seen corresponding path program 6 times [2022-12-14 16:01:38,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:01:38,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119550474] [2022-12-14 16:01:38,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:01:38,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:01:38,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:01:44,560 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:01:44,560 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:01:44,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119550474] [2022-12-14 16:01:44,560 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119550474] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:01:44,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52672285] [2022-12-14 16:01:44,561 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:01:44,561 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:01:44,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:01:44,561 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:01:44,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 16:03:43,532 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:03:43,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:03:43,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 1264 conjuncts, 195 conjunts are in the unsatisfiable core [2022-12-14 16:03:43,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:03:43,581 INFO L350 Elim1Store]: Elim1 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 [2022-12-14 16:03:52,501 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:03:52,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:04:12,681 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:04:12,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52672285] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:04:12,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [516577479] [2022-12-14 16:04:12,683 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-12-14 16:04:12,683 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:04:12,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:04:12,683 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:04:12,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:04:12,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:04:12,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:04:12,692 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:04:12,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:04:12,706 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 16:04:12,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:04:12,738 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:04:12,759 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 16:04:12,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 210 treesize of output 209 [2022-12-14 16:04:12,822 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:04:12,834 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:04:12,841 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:04:14,051 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8054#(and (not (<= (+ |ULTIMATE.start_main_~#array~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#array~0#1.base|))) (<= 0 |ULTIMATE.start_main_~num~0#1|) (<= |ULTIMATE.start_main_#t~nondet3#1| 2147483647) (<= |ULTIMATE.start_main_~num~0#1| 2147483647) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet3#1|)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 16:04:14,051 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:04:14,051 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:04:14,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 285 [2022-12-14 16:04:14,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770571897] [2022-12-14 16:04:14,051 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:04:14,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 287 states [2022-12-14 16:04:14,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:04:14,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 287 interpolants. [2022-12-14 16:04:14,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18723, Invalid=65087, Unknown=0, NotChecked=0, Total=83810 [2022-12-14 16:04:14,061 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand has 287 states, 286 states have (on average 2.0034965034965033) internal successors, (573), 286 states have internal predecessors, (573), 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) [2022-12-14 16:06:32,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:06:32,446 INFO L93 Difference]: Finished difference Result 384 states and 384 transitions. [2022-12-14 16:06:32,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2022-12-14 16:06:32,447 INFO L78 Accepts]: Start accepts. Automaton has has 287 states, 286 states have (on average 2.0034965034965033) internal successors, (573), 286 states have internal predecessors, (573), 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 191 [2022-12-14 16:06:32,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:06:32,448 INFO L225 Difference]: With dead ends: 384 [2022-12-14 16:06:32,448 INFO L226 Difference]: Without dead ends: 384 [2022-12-14 16:06:32,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 760 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 382 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9406 ImplicationChecksByTransitivity, 162.0s TimeCoverageRelationStatistics Valid=45701, Invalid=101371, Unknown=0, NotChecked=0, Total=147072 [2022-12-14 16:06:32,460 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 27503 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 27504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:06:32,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 1 Invalid, 27504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27503 Invalid, 0 Unknown, 0 Unchecked, 8.0s Time] [2022-12-14 16:06:32,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2022-12-14 16:06:32,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 384. [2022-12-14 16:06:32,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 384 states, 383 states have (on average 1.0026109660574412) internal successors, (384), 383 states have internal predecessors, (384), 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) [2022-12-14 16:06:32,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 384 transitions. [2022-12-14 16:06:32,464 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 384 transitions. Word has length 191 [2022-12-14 16:06:32,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:06:32,464 INFO L495 AbstractCegarLoop]: Abstraction has 384 states and 384 transitions. [2022-12-14 16:06:32,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 287 states, 286 states have (on average 2.0034965034965033) internal successors, (573), 286 states have internal predecessors, (573), 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) [2022-12-14 16:06:32,464 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 384 transitions. [2022-12-14 16:06:32,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2022-12-14 16:06:32,468 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:06:32,468 INFO L195 NwaCegarLoop]: trace histogram [191, 190, 1, 1] [2022-12-14 16:06:32,499 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 16:06:32,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:06:32,670 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 9 more)] === [2022-12-14 16:06:32,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:06:32,671 INFO L85 PathProgramCache]: Analyzing trace with hash -392893041, now seen corresponding path program 7 times [2022-12-14 16:06:32,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:06:32,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864490617] [2022-12-14 16:06:32,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:06:32,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:06:33,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:06:56,697 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 0 proven. 36290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:06:56,697 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:06:56,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864490617] [2022-12-14 16:06:56,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864490617] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:06:56,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1756636330] [2022-12-14 16:06:56,697 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:06:56,698 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:06:56,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:06:56,698 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:06:56,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_45e3068e-335b-475d-91b5-227936394b0f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 16:06:57,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:06:57,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 2512 conjuncts, 387 conjunts are in the unsatisfiable core [2022-12-14 16:06:57,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:06:57,149 INFO L350 Elim1Store]: Elim1 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 [2022-12-14 16:07:32,116 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 0 proven. 36290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:07:32,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:08:21,374 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 0 proven. 36290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:08:21,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1756636330] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:08:21,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415308501] [2022-12-14 16:08:21,375 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-12-14 16:08:21,375 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:08:21,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:08:21,375 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:08:21,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:08:21,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:08:21,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:08:21,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 16:08:21,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:08:21,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 16:08:21,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:08:21,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:08:21,445 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 16:08:21,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 217 treesize of output 205 [2022-12-14 16:08:21,479 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:08:21,488 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:08:21,494 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:08:23,904 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11879#(and (not (<= (+ |ULTIMATE.start_main_~#array~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#array~0#1.base|))) (<= 0 |ULTIMATE.start_main_~num~0#1|) (<= |ULTIMATE.start_main_#t~nondet3#1| 2147483647) (<= |ULTIMATE.start_main_~num~0#1| 2147483647) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet3#1|)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 16:08:23,905 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:08:23,905 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:08:23,905 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [191, 191, 191] total 572 [2022-12-14 16:08:23,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643860356] [2022-12-14 16:08:23,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:08:23,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 574 states [2022-12-14 16:08:23,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:08:23,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 574 interpolants. [2022-12-14 16:08:23,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74113, Invalid=258239, Unknown=0, NotChecked=0, Total=332352 [2022-12-14 16:08:23,931 INFO L87 Difference]: Start difference. First operand 384 states and 384 transitions. Second operand has 574 states, 573 states have (on average 2.0017452006980805) internal successors, (1147), 573 states have internal predecessors, (1147), 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)