./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f --- 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-4e7fbc6 [2022-11-23 14:42:49,292 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:42:49,295 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:42:49,332 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:42:49,332 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:42:49,336 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:42:49,339 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:42:49,342 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:42:49,345 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:42:49,350 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:42:49,352 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:42:49,355 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:42:49,355 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:42:49,358 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:42:49,360 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:42:49,362 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:42:49,364 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:42:49,365 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:42:49,367 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:42:49,374 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:42:49,376 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:42:49,377 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:42:49,378 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:42:49,379 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:42:49,385 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:42:49,385 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:42:49,386 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:42:49,390 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:42:49,391 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:42:49,392 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:42:49,392 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:42:49,393 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:42:49,394 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:42:49,394 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:42:49,395 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:42:49,396 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:42:49,396 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:42:49,397 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:42:49,397 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:42:49,398 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:42:49,398 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:42:49,403 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:42:49,433 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:42:49,434 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:42:49,434 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:42:49,434 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:42:49,435 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:42:49,435 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:42:49,436 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:42:49,436 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:42:49,436 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:42:49,436 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:42:49,436 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:42:49,437 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:42:49,437 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:42:49,437 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:42:49,437 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:42:49,438 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:42:49,438 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:42:49,438 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:42:49,439 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:42:49,439 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:42:49,439 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:42:49,440 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:42:49,440 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:42:49,440 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:42:49,440 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:42:49,440 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:42:49,441 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:42:49,441 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:42:49,441 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:42:49,441 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:42:49,442 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:42:49,442 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:42:49,442 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:42:49,442 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:42:49,443 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:42:49,443 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:42:49,443 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:42:49,443 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:42:49,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:42:49,444 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:42:49,444 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:42:49,444 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_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f [2022-11-23 14:42:49,759 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:42:49,782 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:42:49,785 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:42:49,786 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:42:49,787 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:42:49,788 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2022-11-23 14:42:53,054 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:42:53,321 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:42:53,321 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2022-11-23 14:42:53,330 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/data/3573fa477/62e2d6d72a7142d29822fd65c385b5c1/FLAG2cc90ab30 [2022-11-23 14:42:53,346 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/data/3573fa477/62e2d6d72a7142d29822fd65c385b5c1 [2022-11-23 14:42:53,349 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:42:53,351 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:42:53,353 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:42:53,353 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:42:53,357 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:42:53,358 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,359 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b14b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53, skipping insertion in model container [2022-11-23 14:42:53,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,368 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:42:53,385 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:42:53,595 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_160b8d2b-752c-4077-8bb3-8d5326bae60b/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2022-11-23 14:42:53,628 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:42:53,640 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:42:53,656 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_160b8d2b-752c-4077-8bb3-8d5326bae60b/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2022-11-23 14:42:53,669 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:42:53,685 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:42:53,685 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53 WrapperNode [2022-11-23 14:42:53,686 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:42:53,687 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:42:53,688 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:42:53,688 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:42:53,696 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,706 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,740 INFO L138 Inliner]: procedures = 20, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 46 [2022-11-23 14:42:53,741 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:42:53,742 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:42:53,742 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:42:53,742 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:42:53,754 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,767 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,773 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,776 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,790 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,792 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,793 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,794 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:42:53,795 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:42:53,796 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:42:53,796 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:42:53,797 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (1/1) ... [2022-11-23 14:42:53,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:42:53,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:42:53,841 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:42:53,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:42:53,896 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:42:53,897 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:42:53,897 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:42:53,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:42:53,897 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 14:42:53,897 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 14:42:53,978 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:42:53,981 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:42:54,190 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:42:54,258 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:42:54,258 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-23 14:42:54,261 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:42:54 BoogieIcfgContainer [2022-11-23 14:42:54,262 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:42:54,264 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:42:54,264 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:42:54,268 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:42:54,268 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:42:53" (1/3) ... [2022-11-23 14:42:54,269 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66fefb8b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:42:54, skipping insertion in model container [2022-11-23 14:42:54,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:53" (2/3) ... [2022-11-23 14:42:54,270 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66fefb8b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:42:54, skipping insertion in model container [2022-11-23 14:42:54,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:42:54" (3/3) ... [2022-11-23 14:42:54,272 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1_abstracted.c [2022-11-23 14:42:54,295 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:42:54,296 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:42:54,396 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:42:54,404 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@2a87f9c6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:42:54,419 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:42:54,424 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 14:42:54,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-23 14:42:54,447 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:42:54,448 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-23 14:42:54,449 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:42:54,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:42:54,461 INFO L85 PathProgramCache]: Analyzing trace with hash -1091749507, now seen corresponding path program 1 times [2022-11-23 14:42:54,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:42:54,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243963349] [2022-11-23 14:42:54,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:42:54,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:42:54,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:42:54,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:42:54,937 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:42:54,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243963349] [2022-11-23 14:42:54,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243963349] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:42:54,938 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:42:54,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:42:54,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78124583] [2022-11-23 14:42:54,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:42:54,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:42:54,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:42:55,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:42:55,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:42:55,022 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 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) [2022-11-23 14:42:55,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:42:55,132 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2022-11-23 14:42:55,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:42:55,135 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 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 6 [2022-11-23 14:42:55,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:42:55,144 INFO L225 Difference]: With dead ends: 37 [2022-11-23 14:42:55,145 INFO L226 Difference]: Without dead ends: 20 [2022-11-23 14:42:55,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:42:55,153 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 4 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:42:55,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 25 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:42:55,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-23 14:42:55,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2022-11-23 14:42:55,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:42:55,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-23 14:42:55,203 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 6 [2022-11-23 14:42:55,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:42:55,205 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-23 14:42:55,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 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) [2022-11-23 14:42:55,206 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-23 14:42:55,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:42:55,209 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:42:55,209 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:42:55,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 14:42:55,210 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:42:55,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:42:55,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1655309817, now seen corresponding path program 1 times [2022-11-23 14:42:55,212 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:42:55,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35104679] [2022-11-23 14:42:55,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:42:55,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:42:55,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:42:55,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:42:55,322 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:42:55,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35104679] [2022-11-23 14:42:55,323 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35104679] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:42:55,323 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:42:55,323 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:42:55,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201726532] [2022-11-23 14:42:55,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:42:55,325 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:42:55,325 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:42:55,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:42:55,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:42:55,327 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-11-23 14:42:55,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:42:55,371 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2022-11-23 14:42:55,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:42:55,372 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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 7 [2022-11-23 14:42:55,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:42:55,373 INFO L225 Difference]: With dead ends: 31 [2022-11-23 14:42:55,374 INFO L226 Difference]: Without dead ends: 18 [2022-11-23 14:42:55,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:42:55,376 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:42:55,380 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 23 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:42:55,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-23 14:42:55,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2022-11-23 14:42:55,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:42:55,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-23 14:42:55,391 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 7 [2022-11-23 14:42:55,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:42:55,393 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-23 14:42:55,393 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-11-23 14:42:55,395 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-23 14:42:55,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:42:55,396 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:42:55,397 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:42:55,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 14:42:55,398 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:42:55,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:42:55,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1647057710, now seen corresponding path program 1 times [2022-11-23 14:42:55,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:42:55,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [960189038] [2022-11-23 14:42:55,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:42:55,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:42:55,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:42:55,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:42:55,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:42:55,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [960189038] [2022-11-23 14:42:55,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [960189038] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:42:55,780 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:42:55,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:42:55,780 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589260787] [2022-11-23 14:42:55,780 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:42:55,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:42:55,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:42:55,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:42:55,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:42:55,783 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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) [2022-11-23 14:42:55,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:42:55,861 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2022-11-23 14:42:55,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:42:55,862 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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 7 [2022-11-23 14:42:55,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:42:55,863 INFO L225 Difference]: With dead ends: 23 [2022-11-23 14:42:55,863 INFO L226 Difference]: Without dead ends: 21 [2022-11-23 14:42:55,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:42:55,865 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:42:55,866 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 34 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:42:55,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-23 14:42:55,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-11-23 14:42:55,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:42:55,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-11-23 14:42:55,882 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 7 [2022-11-23 14:42:55,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:42:55,883 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-11-23 14:42:55,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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) [2022-11-23 14:42:55,883 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-11-23 14:42:55,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-23 14:42:55,884 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:42:55,885 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:42:55,885 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-23 14:42:55,885 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:42:55,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:42:55,886 INFO L85 PathProgramCache]: Analyzing trace with hash -1577091667, now seen corresponding path program 1 times [2022-11-23 14:42:55,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:42:55,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243636198] [2022-11-23 14:42:55,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:42:55,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:42:55,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:42:56,072 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:42:56,072 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:42:56,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243636198] [2022-11-23 14:42:56,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243636198] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:42:56,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422850619] [2022-11-23 14:42:56,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:42:56,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:42:56,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:42:56,080 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:42:56,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:42:56,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:42:56,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 14:42:56,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:42:56,259 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:42:56,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:42:56,339 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:42:56,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422850619] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:42:56,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [578005041] [2022-11-23 14:42:56,364 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-23 14:42:56,364 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:42:56,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:42:56,375 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:42:56,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:42:57,987 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2022-11-23 14:42:58,083 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:42:58,698 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '326#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:42:58,698 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:42:58,698 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:42:58,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-23 14:42:58,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149088329] [2022-11-23 14:42:58,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:42:58,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:42:58,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:42:58,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:42:58,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-11-23 14:42:58,700 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:42:58,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:42:58,819 INFO L93 Difference]: Finished difference Result 47 states and 57 transitions. [2022-11-23 14:42:58,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:42:58,819 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 14 [2022-11-23 14:42:58,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:42:58,820 INFO L225 Difference]: With dead ends: 47 [2022-11-23 14:42:58,821 INFO L226 Difference]: Without dead ends: 29 [2022-11-23 14:42:58,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2022-11-23 14:42:58,823 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 5 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:42:58,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 56 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:42:58,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-23 14:42:58,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-23 14:42:58,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-23 14:42:58,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2022-11-23 14:42:58,842 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 14 [2022-11-23 14:42:58,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:42:58,843 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2022-11-23 14:42:58,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:42:58,844 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2022-11-23 14:42:58,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 14:42:58,846 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:42:58,846 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-23 14:42:58,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:42:59,052 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:42:59,052 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:42:59,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:42:59,053 INFO L85 PathProgramCache]: Analyzing trace with hash 1609317511, now seen corresponding path program 2 times [2022-11-23 14:42:59,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:42:59,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527722637] [2022-11-23 14:42:59,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:42:59,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:42:59,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:42:59,276 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 14:42:59,276 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:42:59,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527722637] [2022-11-23 14:42:59,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1527722637] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:42:59,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023152790] [2022-11-23 14:42:59,277 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:42:59,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:42:59,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:42:59,278 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:42:59,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:42:59,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:42:59,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:42:59,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 14:42:59,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:42:59,802 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 14:42:59,802 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:42:59,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023152790] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:42:59,803 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:42:59,803 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2022-11-23 14:42:59,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076453237] [2022-11-23 14:42:59,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:42:59,804 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:42:59,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:42:59,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:42:59,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-23 14:42:59,805 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:43:00,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:43:00,081 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2022-11-23 14:43:00,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 14:43:00,082 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-11-23 14:43:00,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:43:00,084 INFO L225 Difference]: With dead ends: 35 [2022-11-23 14:43:00,084 INFO L226 Difference]: Without dead ends: 31 [2022-11-23 14:43:00,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-11-23 14:43:00,085 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 9 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:43:00,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 62 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:43:00,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-23 14:43:00,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-23 14:43:00,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-23 14:43:00,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2022-11-23 14:43:00,108 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 35 [2022-11-23 14:43:00,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:43:00,109 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2022-11-23 14:43:00,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:43:00,109 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2022-11-23 14:43:00,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-23 14:43:00,111 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:43:00,111 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:43:00,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:43:00,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:00,318 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:43:00,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:43:00,318 INFO L85 PathProgramCache]: Analyzing trace with hash 1075068730, now seen corresponding path program 1 times [2022-11-23 14:43:00,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:43:00,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585046585] [2022-11-23 14:43:00,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:43:00,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:43:00,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:43:00,540 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-23 14:43:00,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:43:00,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585046585] [2022-11-23 14:43:00,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585046585] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:43:00,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658709187] [2022-11-23 14:43:00,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:43:00,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:00,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:43:00,543 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:43:00,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:43:00,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:43:00,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 14:43:00,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:43:00,721 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-23 14:43:00,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:43:00,891 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-23 14:43:00,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658709187] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:43:00,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1481773210] [2022-11-23 14:43:00,894 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-23 14:43:00,894 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:43:00,895 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:43:00,895 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:43:00,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:43:03,250 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:43:03,257 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:43:03,890 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '926#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:43:03,891 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:43:03,891 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:43:03,891 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 15 [2022-11-23 14:43:03,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193752983] [2022-11-23 14:43:03,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:43:03,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-23 14:43:03,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:43:03,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-23 14:43:03,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2022-11-23 14:43:03,893 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-23 14:43:04,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:43:04,685 INFO L93 Difference]: Finished difference Result 128 states and 169 transitions. [2022-11-23 14:43:04,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-23 14:43:04,686 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) Word has length 42 [2022-11-23 14:43:04,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:43:04,688 INFO L225 Difference]: With dead ends: 128 [2022-11-23 14:43:04,688 INFO L226 Difference]: Without dead ends: 99 [2022-11-23 14:43:04,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=329, Invalid=1563, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 14:43:04,690 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 105 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:43:04,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 106 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:43:04,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-23 14:43:04,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2022-11-23 14:43:04,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 63 states have internal predecessors, (68), 25 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-23 14:43:04,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 117 transitions. [2022-11-23 14:43:04,745 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 117 transitions. Word has length 42 [2022-11-23 14:43:04,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:43:04,745 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 117 transitions. [2022-11-23 14:43:04,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-23 14:43:04,746 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 117 transitions. [2022-11-23 14:43:04,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-23 14:43:04,750 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:43:04,751 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 20, 20, 20, 20, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-23 14:43:04,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:43:04,959 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:04,959 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:43:04,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:43:04,960 INFO L85 PathProgramCache]: Analyzing trace with hash -142712643, now seen corresponding path program 2 times [2022-11-23 14:43:04,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:43:04,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303778850] [2022-11-23 14:43:04,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:43:04,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:43:05,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:43:05,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 310 proven. 35 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2022-11-23 14:43:05,525 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:43:05,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303778850] [2022-11-23 14:43:05,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303778850] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:43:05,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3340705] [2022-11-23 14:43:05,526 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:43:05,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:05,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:43:05,532 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:43:05,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:43:07,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-23 14:43:07,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:43:07,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-23 14:43:07,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:43:07,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 406 proven. 35 refuted. 0 times theorem prover too weak. 1389 trivial. 0 not checked. [2022-11-23 14:43:07,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:43:08,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 316 proven. 35 refuted. 0 times theorem prover too weak. 1479 trivial. 0 not checked. [2022-11-23 14:43:08,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3340705] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:43:08,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1496230674] [2022-11-23 14:43:08,021 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-23 14:43:08,022 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:43:08,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:43:08,022 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:43:08,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:43:09,981 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:43:09,988 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:43:10,681 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2405#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:43:10,681 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:43:10,681 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:43:10,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 16 [2022-11-23 14:43:10,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807862085] [2022-11-23 14:43:10,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:43:10,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 14:43:10,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:43:10,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 14:43:10,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=477, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:43:10,684 INFO L87 Difference]: Start difference. First operand 91 states and 117 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-23 14:43:12,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:43:12,051 INFO L93 Difference]: Finished difference Result 248 states and 350 transitions. [2022-11-23 14:43:12,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 14:43:12,055 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) Word has length 178 [2022-11-23 14:43:12,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:43:12,056 INFO L225 Difference]: With dead ends: 248 [2022-11-23 14:43:12,057 INFO L226 Difference]: Without dead ends: 175 [2022-11-23 14:43:12,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 518 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=215, Invalid=715, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:43:12,059 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 34 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:43:12,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 104 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:43:12,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-11-23 14:43:12,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2022-11-23 14:43:12,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 119 states have (on average 1.0420168067226891) internal successors, (124), 119 states have internal predecessors, (124), 53 states have call successors, (53), 3 states have call predecessors, (53), 2 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-23 14:43:12,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 229 transitions. [2022-11-23 14:43:12,128 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 229 transitions. Word has length 178 [2022-11-23 14:43:12,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:43:12,129 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 229 transitions. [2022-11-23 14:43:12,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-23 14:43:12,130 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 229 transitions. [2022-11-23 14:43:12,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2022-11-23 14:43:12,135 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:43:12,136 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 48, 48, 48, 48, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-23 14:43:12,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:43:12,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:12,344 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:43:12,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:43:12,344 INFO L85 PathProgramCache]: Analyzing trace with hash 20085617, now seen corresponding path program 3 times [2022-11-23 14:43:12,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:43:12,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577578061] [2022-11-23 14:43:12,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:43:12,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:43:12,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:43:14,261 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 1479 proven. 210 refuted. 0 times theorem prover too weak. 7323 trivial. 0 not checked. [2022-11-23 14:43:14,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:43:14,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577578061] [2022-11-23 14:43:14,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577578061] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:43:14,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748418592] [2022-11-23 14:43:14,262 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:43:14,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:14,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:43:14,264 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:43:14,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:43:14,508 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:43:14,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:43:14,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 14:43:14,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:43:15,093 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 104 proven. 2890 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2022-11-23 14:43:15,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:43:16,103 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 208 proven. 2786 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2022-11-23 14:43:16,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748418592] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:43:16,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [679164155] [2022-11-23 14:43:16,106 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-23 14:43:16,107 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:43:16,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:43:16,107 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:43:16,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:43:17,902 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:43:17,907 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:43:23,152 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5394#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:43:23,152 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:43:23,152 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:43:23,153 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 35 [2022-11-23 14:43:23,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658658117] [2022-11-23 14:43:23,153 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:43:23,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-23 14:43:23,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:43:23,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-23 14:43:23,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1576, Unknown=0, NotChecked=0, Total=1806 [2022-11-23 14:43:23,156 INFO L87 Difference]: Start difference. First operand 175 states and 229 transitions. Second operand has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 35 states have internal predecessors, (101), 29 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 29 states have call predecessors, (38), 29 states have call successors, (38) [2022-11-23 14:43:37,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:43:37,615 INFO L93 Difference]: Finished difference Result 601 states and 816 transitions. [2022-11-23 14:43:37,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2022-11-23 14:43:37,616 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 35 states have internal predecessors, (101), 29 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 29 states have call predecessors, (38), 29 states have call successors, (38) Word has length 374 [2022-11-23 14:43:37,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:43:37,620 INFO L225 Difference]: With dead ends: 601 [2022-11-23 14:43:37,621 INFO L226 Difference]: Without dead ends: 465 [2022-11-23 14:43:37,636 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1269 GetRequests, 995 SyntacticMatches, 100 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13203 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=3448, Invalid=27352, Unknown=0, NotChecked=0, Total=30800 [2022-11-23 14:43:37,637 INFO L413 NwaCegarLoop]: 221 mSDtfsCounter, 557 mSDsluCounter, 1647 mSDsCounter, 0 mSdLazyCounter, 4943 mSolverCounterSat, 619 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 561 SdHoareTripleChecker+Valid, 1868 SdHoareTripleChecker+Invalid, 5562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 619 IncrementalHoareTripleChecker+Valid, 4943 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:43:37,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [561 Valid, 1868 Invalid, 5562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [619 Valid, 4943 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-11-23 14:43:37,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2022-11-23 14:43:37,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 445. [2022-11-23 14:43:37,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 301 states have (on average 1.0365448504983388) internal successors, (312), 301 states have internal predecessors, (312), 141 states have call successors, (141), 3 states have call predecessors, (141), 2 states have return successors, (140), 140 states have call predecessors, (140), 140 states have call successors, (140) [2022-11-23 14:43:37,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 593 transitions. [2022-11-23 14:43:37,833 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 593 transitions. Word has length 374 [2022-11-23 14:43:37,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:43:37,833 INFO L495 AbstractCegarLoop]: Abstraction has 445 states and 593 transitions. [2022-11-23 14:43:37,834 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 35 states have internal predecessors, (101), 29 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 29 states have call predecessors, (38), 29 states have call successors, (38) [2022-11-23 14:43:37,834 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 593 transitions. [2022-11-23 14:43:37,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 997 [2022-11-23 14:43:37,873 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:43:37,874 INFO L195 NwaCegarLoop]: trace histogram [141, 140, 140, 130, 130, 130, 130, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2022-11-23 14:43:37,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:43:38,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-23 14:43:38,083 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:43:38,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:43:38,084 INFO L85 PathProgramCache]: Analyzing trace with hash -1374958435, now seen corresponding path program 4 times [2022-11-23 14:43:38,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:43:38,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28946910] [2022-11-23 14:43:38,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:43:38,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:43:39,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:43:43,410 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 5096 proven. 247 refuted. 0 times theorem prover too weak. 60502 trivial. 0 not checked. [2022-11-23 14:43:43,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:43:43,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28946910] [2022-11-23 14:43:43,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28946910] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:43:43,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356164593] [2022-11-23 14:43:43,411 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:43:43,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:43,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:43:43,413 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:43:43,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:43:44,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:43:44,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 2143 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-23 14:43:44,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:43:45,634 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 280 proven. 24413 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2022-11-23 14:43:45,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:43:48,708 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 373 proven. 24320 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2022-11-23 14:43:48,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356164593] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:43:48,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [245287599] [2022-11-23 14:43:48,711 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-23 14:43:48,712 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:43:48,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:43:48,712 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:43:48,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:43:50,624 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:43:50,629 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:44:14,170 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13431#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:44:14,170 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:44:14,170 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:44:14,171 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 24, 24] total 60 [2022-11-23 14:44:14,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465422679] [2022-11-23 14:44:14,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:44:14,175 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-23 14:44:14,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:44:14,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-23 14:44:14,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=689, Invalid=3867, Unknown=0, NotChecked=0, Total=4556 [2022-11-23 14:44:14,178 INFO L87 Difference]: Start difference. First operand 445 states and 593 transitions. Second operand has 60 states, 60 states have (on average 3.1166666666666667) internal successors, (187), 60 states have internal predecessors, (187), 54 states have call successors, (76), 2 states have call predecessors, (76), 1 states have return successors, (75), 54 states have call predecessors, (75), 54 states have call successors, (75) [2022-11-23 14:47:56,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:56,260 INFO L93 Difference]: Finished difference Result 1474 states and 2014 transitions. [2022-11-23 14:47:56,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 342 states. [2022-11-23 14:47:56,261 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.1166666666666667) internal successors, (187), 60 states have internal predecessors, (187), 54 states have call successors, (76), 2 states have call predecessors, (76), 1 states have return successors, (75), 54 states have call predecessors, (75), 54 states have call successors, (75) Word has length 996 [2022-11-23 14:47:56,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:56,268 INFO L225 Difference]: With dead ends: 1474 [2022-11-23 14:47:56,268 INFO L226 Difference]: Without dead ends: 1071 [2022-11-23 14:47:56,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3320 GetRequests, 2667 SyntacticMatches, 270 SemanticMatches, 383 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70847 ImplicationChecksByTransitivity, 232.7s TimeCoverageRelationStatistics Valid=15796, Invalid=132044, Unknown=0, NotChecked=0, Total=147840 [2022-11-23 14:47:56,285 INFO L413 NwaCegarLoop]: 512 mSDtfsCounter, 1359 mSDsluCounter, 5048 mSDsCounter, 0 mSdLazyCounter, 17056 mSolverCounterSat, 1458 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1363 SdHoareTripleChecker+Valid, 5560 SdHoareTripleChecker+Invalid, 18514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1458 IncrementalHoareTripleChecker+Valid, 17056 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:56,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1363 Valid, 5560 Invalid, 18514 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1458 Valid, 17056 Invalid, 0 Unknown, 0 Unchecked, 14.1s Time] [2022-11-23 14:47:56,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1071 states. [2022-11-23 14:47:56,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1071 to 1027. [2022-11-23 14:47:56,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1027 states, 693 states have (on average 1.0331890331890332) internal successors, (716), 693 states have internal predecessors, (716), 331 states have call successors, (331), 3 states have call predecessors, (331), 2 states have return successors, (330), 330 states have call predecessors, (330), 330 states have call successors, (330) [2022-11-23 14:47:56,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1027 states to 1027 states and 1377 transitions. [2022-11-23 14:47:56,525 INFO L78 Accepts]: Start accepts. Automaton has 1027 states and 1377 transitions. Word has length 996 [2022-11-23 14:47:56,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:56,526 INFO L495 AbstractCegarLoop]: Abstraction has 1027 states and 1377 transitions. [2022-11-23 14:47:56,526 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.1166666666666667) internal successors, (187), 60 states have internal predecessors, (187), 54 states have call successors, (76), 2 states have call predecessors, (76), 1 states have return successors, (75), 54 states have call predecessors, (75), 54 states have call successors, (75) [2022-11-23 14:47:56,526 INFO L276 IsEmpty]: Start isEmpty. Operand 1027 states and 1377 transitions. [2022-11-23 14:47:56,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2339 [2022-11-23 14:47:56,776 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:56,776 INFO L195 NwaCegarLoop]: trace histogram [331, 330, 330, 308, 308, 308, 308, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2022-11-23 14:47:56,788 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-23 14:47:56,979 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:56,979 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:47:56,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:56,980 INFO L85 PathProgramCache]: Analyzing trace with hash 797960315, now seen corresponding path program 5 times [2022-11-23 14:47:56,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:56,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660665842] [2022-11-23 14:47:56,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:56,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:59,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:07,545 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 13639 proven. 287 refuted. 0 times theorem prover too weak. 353430 trivial. 0 not checked. [2022-11-23 14:48:07,545 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:07,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660665842] [2022-11-23 14:48:07,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660665842] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:48:07,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698391469] [2022-11-23 14:48:07,546 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:48:07,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:07,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:07,547 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:07,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:48:28,429 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-11-23 14:48:28,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:48:28,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-23 14:48:28,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:28,726 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 14995 proven. 287 refuted. 0 times theorem prover too weak. 352074 trivial. 0 not checked. [2022-11-23 14:48:28,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:31,509 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 14668 proven. 287 refuted. 0 times theorem prover too weak. 352401 trivial. 0 not checked. [2022-11-23 14:48:31,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698391469] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:31,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074920385] [2022-11-23 14:48:31,512 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-23 14:48:31,513 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:31,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:31,513 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:31,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:33,098 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:48:33,102 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:34,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32296#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:48:34,133 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:48:34,133 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:48:34,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 21] total 37 [2022-11-23 14:48:34,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161724254] [2022-11-23 14:48:34,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:48:34,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-23 14:48:34,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:34,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-23 14:48:34,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=1657, Unknown=0, NotChecked=0, Total=2070 [2022-11-23 14:48:34,140 INFO L87 Difference]: Start difference. First operand 1027 states and 1377 transitions. Second operand has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 37 states have internal predecessors, (85), 31 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 30 states have call predecessors, (34), 31 states have call successors, (34) [2022-11-23 14:48:47,835 WARN L233 SmtUtils]: Spent 10.29s on a formula simplification. DAG size of input: 97 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:48:59,806 WARN L233 SmtUtils]: Spent 8.33s on a formula simplification. DAG size of input: 91 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:49:12,042 WARN L233 SmtUtils]: Spent 10.57s on a formula simplification. DAG size of input: 85 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:49:22,940 WARN L233 SmtUtils]: Spent 7.11s on a formula simplification. DAG size of input: 79 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:50:35,690 WARN L233 SmtUtils]: Spent 34.35s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:51:06,663 WARN L233 SmtUtils]: Spent 23.85s on a formula simplification that was a NOOP. DAG size: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:51:43,125 WARN L233 SmtUtils]: Spent 29.92s on a formula simplification that was a NOOP. DAG size: 91 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:51:44,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:51:44,541 INFO L93 Difference]: Finished difference Result 3087 states and 4498 transitions. [2022-11-23 14:51:44,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-23 14:51:44,542 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 37 states have internal predecessors, (85), 31 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 30 states have call predecessors, (34), 31 states have call successors, (34) Word has length 2338 [2022-11-23 14:51:44,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:51:44,553 INFO L225 Difference]: With dead ends: 3087 [2022-11-23 14:51:44,553 INFO L226 Difference]: Without dead ends: 2083 [2022-11-23 14:51:44,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7048 GetRequests, 6986 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 185.9s TimeCoverageRelationStatistics Valid=980, Invalid=2921, Unknown=5, NotChecked=0, Total=3906 [2022-11-23 14:51:44,559 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 108 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 1179 mSolverCounterSat, 226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 1405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 226 IncrementalHoareTripleChecker+Valid, 1179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:51:44,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 347 Invalid, 1405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [226 Valid, 1179 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2022-11-23 14:51:44,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2022-11-23 14:51:45,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2083. [2022-11-23 14:51:45,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2083 states, 1397 states have (on average 1.0164638511095203) internal successors, (1420), 1397 states have internal predecessors, (1420), 683 states have call successors, (683), 3 states have call predecessors, (683), 2 states have return successors, (682), 682 states have call predecessors, (682), 682 states have call successors, (682) [2022-11-23 14:51:45,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2083 states to 2083 states and 2785 transitions. [2022-11-23 14:51:45,051 INFO L78 Accepts]: Start accepts. Automaton has 2083 states and 2785 transitions. Word has length 2338 [2022-11-23 14:51:45,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:51:45,052 INFO L495 AbstractCegarLoop]: Abstraction has 2083 states and 2785 transitions. [2022-11-23 14:51:45,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 37 states have internal predecessors, (85), 31 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 30 states have call predecessors, (34), 31 states have call successors, (34) [2022-11-23 14:51:45,053 INFO L276 IsEmpty]: Start isEmpty. Operand 2083 states and 2785 transitions. [2022-11-23 14:51:45,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4803 [2022-11-23 14:51:45,246 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:51:45,248 INFO L195 NwaCegarLoop]: trace histogram [683, 682, 682, 660, 660, 660, 660, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2022-11-23 14:51:45,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:51:45,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 14:51:45,458 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:51:45,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:51:45,459 INFO L85 PathProgramCache]: Analyzing trace with hash -1629040005, now seen corresponding path program 6 times [2022-11-23 14:51:45,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:51:45,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831537100] [2022-11-23 14:51:45,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:45,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:51:56,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:52:29,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1598124 backedges. 59367 proven. 1335 refuted. 0 times theorem prover too weak. 1537422 trivial. 0 not checked. [2022-11-23 14:52:29,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:52:29,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831537100] [2022-11-23 14:52:29,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831537100] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:52:29,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885307863] [2022-11-23 14:52:29,283 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:52:29,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:29,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:52:29,288 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:52:29,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_160b8d2b-752c-4077-8bb3-8d5326bae60b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:52:31,589 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:52:31,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:52:31,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 10273 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-23 14:52:31,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:52:37,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1598124 backedges. 1364 proven. 639757 refuted. 0 times theorem prover too weak. 957003 trivial. 0 not checked. [2022-11-23 14:52:37,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:52:50,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1598124 backedges. 1900 proven. 639221 refuted. 0 times theorem prover too weak. 957003 trivial. 0 not checked. [2022-11-23 14:52:50,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885307863] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:52:50,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654337420] [2022-11-23 14:52:50,085 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-23 14:52:50,085 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:52:50,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:52:50,086 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:52:50,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:52:51,567 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:52:51,570 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:52:53,544 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69902#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:52:53,545 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:52:53,545 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:52:53,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 48, 48] total 125 [2022-11-23 14:52:53,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647936085] [2022-11-23 14:52:53,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:52:53,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-11-23 14:52:53,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:52:53,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-11-23 14:52:53,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2520, Invalid=15302, Unknown=0, NotChecked=0, Total=17822 [2022-11-23 14:52:53,564 INFO L87 Difference]: Start difference. First operand 2083 states and 2785 transitions. Second operand has 125 states, 125 states have (on average 3.112) internal successors, (389), 125 states have internal predecessors, (389), 119 states have call successors, (165), 2 states have call predecessors, (165), 1 states have return successors, (164), 119 states have call predecessors, (164), 119 states have call successors, (164) [2022-11-23 14:56:04,917 WARN L233 SmtUtils]: Spent 5.02s on a formula simplification. DAG size of input: 97 DAG size of output: 14 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:56:27,287 WARN L233 SmtUtils]: Spent 5.49s on a formula simplification. DAG size of input: 97 DAG size of output: 14 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)